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1

Controlled Nuclear Fusion Reactions  

Science Journals Connector (OSTI)

... THE presentation of full and authoritative accounts of research on controlled nuclear fusion reactions was a major feature of the second Geneva Conference on the Peaceful Uses of ...

R. S. PEASE

1958-10-18T23:59:59.000Z

2

Fusion and Heavy Ion Reactions  

Science Journals Connector (OSTI)

......February 2004 research-article Articles Fusion and Heavy Ion Reactions David M. Brink...useful for understanding of sub-barrier fusion processes. The Christensen-Winther...potentials like the CW interaction give good fusion cross-sections near and for a few MeV......

David M. Brink

2004-02-01T23:59:59.000Z

3

Fusion Reactions Involving Radioactive Beams at GANIL  

Science Journals Connector (OSTI)

......February 2004 research-article Articles Fusion Reactions Involving Radioactive Beams...been used to produce exotic nuclei via fusion evaporation or to study reaction mechanisms...Physics Supplement No. 154, 2004 113 Fusion Reactions Involving Radioactive Beams......

Gilles de France

2004-02-01T23:59:59.000Z

4

Fusion Reactions of Polarized Deuterons  

Science Journals Connector (OSTI)

Polarized and unpolarized d+d?n+He3 fusion reaction cross sections in the center-of-mass energy region of 20-150 keV are calculated in a distorted-wave Born approximation. The calculated unpolarized cross sections and the anisotropy of the angular distributions are within 20% of the experimental data. The polarized cross sections are found to be Ĺ7.7% of the unpolarized ones despite the inclusion of the D-state component in He3. This shows that the idea of a "neutronlean" reactor may still be feasible.

J. S. Zhang; K. F. Liu; G. W. Shuy

1986-09-22T23:59:59.000Z

5

Method of controlling fusion reaction rates  

DOE Patents (OSTI)

A method of controlling the reaction rates of the fuel atoms in a fusion reactor comprises the step of polarizing the nuclei of the fuel atoms in a particular direction relative to the plasma confining magnetic field. Fusion reaction rates can be increased or decreased, and the direction of emission of the reaction products can be controlled, depending on the choice of polarization direction.

Kulsrud, Russell M. (Princeton, NJ); Furth, Harold P. (Princeton, NJ); Valeo, Ernest J. (Princeton Junction, NJ); Goldhaber, Maurice (Bayport, NY)

1988-01-01T23:59:59.000Z

6

Method of controlling fusion reaction rates  

DOE Patents (OSTI)

This invention relates to a method of controlling the reaction rates in a nuclear fusion reactor; and more particularly, to the use of polarized nuclear fuel.

Kulsrud, R.M.; Furth, H.P.; Valeo, E.J.; Goldhaber, M.

1983-05-09T23:59:59.000Z

7

Unlocking Fusion Power: Materials are the Key  

E-Print Network (OSTI)

knocked out of place several times a year ­ Some elements transmute by nuclear reactions ­ Helium (the" ­ every atom gets knocked out of place several times a year ­ Some elements transmute by nuclear reactions Likely to be "Oxide Dispersion Strengthened" variants - Very high density of nanometre scale Y2O3

8

Influence of projectile neutron number on cross section in cold fusion reactions  

E-Print Network (OSTI)

ON CROSS SECTION IN COLD FUSION REACTIONS I. Dragojevi? ,type of reaction has been referred to as “cold fusion. ”The study of cold fusion reactions is an indispensable

Dragojevic, I.

2008-01-01T23:59:59.000Z

9

Fusion reactions with germanium isotopes  

Science Journals Connector (OSTI)

Measurements of the fusion of 16O and 27Al with a series of germanium isotopes are analyzed within a coupled-channels approach. It is found that couplings based interactions that are linear in the deformation amplitudes are insufficient in reproducing the data. In order to obtain reasonable fits, it is necessary also to include couplings based on quadratic interactions. The analysis suggests that the nuclear radius of 72Ge is significantly smaller than predicted from a smooth interpolation between other germanium isotopes. The large prolate deformation of 74Ge, which has been proposed as the preferred solution to measurements of the quadrupole moment of the 2+ state, is not supported by the analysis; the near spherical solution is more likely.

H. Esbensen

2003-09-04T23:59:59.000Z

10

From Nucleons To Nuclei To Fusion Reactions  

SciTech Connect

Nuclei are prototypes of many-body open quantum systems. Complex aggregates of protons and neutrons that interact through forces arising from quantum chromo-dynamics, nuclei exhibit both bound and unbound states, which can be strongly coupled. In this respect, one of the major challenges for computational nuclear physics, is to provide a unified description of structural and reaction properties of nuclei that is based on the fundamental underlying physics: the constituent nucleons and the realistic interactions among them. This requires a combination of innovative theoretical approaches and high-performance computing. In this contribution, we present one of such promising techniques, the ab initio no-core shell model/resonating-group method, and discuss applications to light nuclei scattering and fusion reactions that power stars and Earth-base fusion facilities.

Quaglioni, S; Navratil, P; Roth, R; Horiuchi, W

2012-02-15T23:59:59.000Z

11

Fusion Barriers in Heavy-Ion Reactions  

Science Journals Connector (OSTI)

We present experimental fusion barriers for S32 ions on Mg24, Al27, Ca40, and Ni58. These and published data for Ar and Kr ion-induced reactions are analyzed in terms of a simple classical formula for barrier heights. A prescription based on equivalent uniform charge radii from electron scattering is shown to reproduce all results to within the experimental uncertainty.

H. H. Gutbrod; W. G. Winn; M. Blann

1973-06-18T23:59:59.000Z

12

Fusion Reaction of Halo Nuclei: Proton Halo versus Neutron Halo  

Science Journals Connector (OSTI)

......February 2004 research-article Articles Fusion Reaction of Halo Nuclei: Proton Halo...Tsukuba, Tsukuba 305-8571, Japan. The fusion reaction of halo nuclei on heavy target...Schrodinger equation. We find that the fusion probability is enhanced by the presence......

Takashi Nakatsukasa; Kazuhiro Yabana; Makoto Ito; Minoru Kobayashi; Manabu Ueda

2004-02-01T23:59:59.000Z

13

Fusion reactions in multicomponent dense matter  

Science Journals Connector (OSTI)

We analyze thermonuclear and pycnonuclear fusion reactions in dense matter containing atomic nuclei of different types. We extend a phenomenological expression for the reaction rate, proposed recently by Gasques et al. [Phys. Rev. C 72, 025806 (2005)] for the one-component plasma of nuclei, to the multicomponent plasma. The expression contains several fit parameters which we adjust to reproduce the best microscopic calculations available in the literature. Furthermore, we show that pycnonuclear burning is drastically affected by an (unknown) structure of the multicomponent matter (a regular lattice, a uniform mix, etc.). We apply the results to study nuclear burning in a 12C-16O mixture. In this context, we present new calculations of the astrophysical S factors for carbon-oxygen and oxygen-oxygen fusion reactions. We show that the presence of a C-O lattice can strongly suppress carbon ignition in white dwarf cores and neutron star crusts at densities ??3×109 g cm-3 and temperatures T?108 K.

D. G. Yakovlev; L. R. Gasques; A. V. Afanasjev; M. Beard; M. Wiescher

2006-09-27T23:59:59.000Z

14

Penetration Factor for Nuclear Fusion Reaction in Nonthermal Astrophysical Plasmas  

Science Journals Connector (OSTI)

......enhances the fusion penetration factor. In addition...nonthermal effect on the penetration factor is found to be...the fusion reaction rates of the - chain and the...effect on the fusion penetration factor decreases with...the energy generation rate (Choudhuri 2010) by......

Dai-Han Ki; Young-Dae Jung

2011-02-25T23:59:59.000Z

15

Fusion hindrance in reactions with very heavy ions: Border between normal and hindered fusion  

SciTech Connect

The fusion hindrance in heavy-ion collisions is studied in the framework of the two-center liquid drop model. It appears that the neck and the radial degrees of freedom might both be hampered by an inner potential barrier on their path between the contact configuration to the compound nucleus. Heavy-ion reactions with and without the two kinds of fusion hindrance are classified through systematic calculations. It is found that the number of reactions without radial fusion hindrance is much smaller than that without neck fusion hindrance, and for both kinds of fusion hindrance the number of reactions without fusion hindrance at small mass-asymmetry parameter {alpha} is smaller than that at large {alpha}. In the formation of a given compound nucleus, if a reaction with {alpha}{sub c} is not hindered, then other reactions with {alpha}>{alpha}{sub c} are also not hindered, as is well known experimentally.

Shen Caiwan; Li Qingfeng [School of Science, Huzhou Teachers College, Huzhou 313000 (China); Boilley, David [GANIL, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen cedex 5 (France); Universite de Caen Basse-Normandie, F-14032 Caen (France); Shen Junjie [School of Science, Huzhou Teachers College, Huzhou 313000 (China); School of Science and Information Engineering, Zhejiang Normal University, Jinhua 321000 (China); Abe, Yasuhisa [Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 (Japan)

2011-05-15T23:59:59.000Z

16

Subbarrier fusion reactions and many-particle quantum tunneling  

E-Print Network (OSTI)

Low energy heavy-ion fusion reactions are governed by quantum tunneling through the Coulomb barrier formed by a strong cancellation of the repulsive Coulomb force with the attractive nuclear interaction between the colliding nuclei. Extensive experimental as well as theoretical studies have revealed that fusion reactions are strongly influenced by couplings of the relative motion of the colliding nuclei to several nuclear intrinsic motions. Heavy-ion subbarrier fusion reactions thus provide a good opportunity to address a general problem on quantum tunneling in the presence of couplings, which has been a popular subject in the past decades in many branches of physics and chemistry. Here we review theoretical aspects of heavy-ion subbarrier fusion reactions from the view point of quantum tunneling in systems with many degrees of freedom. Particular emphases are put on the coupled-channels approach to fusion reactions, and the barrier distribution representation for multi-channel penetrability. We also discuss ...

Hagino, K

2012-01-01T23:59:59.000Z

17

Transfer-type products accompanying cold fusion reactions  

Science Journals Connector (OSTI)

Production of nuclei heavier than the target is treated for projectile-target combinations used in cold fusion reactions leading to superheavy nuclei. These products are related to transfer-type or to asymmetry-exit-channel quasifission reactions. The production of isotopes in the transfer-type reactions emitting of ? particles with large energies is discussed.

G. G. Adamian and N. V. Antonenko

2005-12-29T23:59:59.000Z

18

Pairing Effects in Nuclear Fusion Reaction  

E-Print Network (OSTI)

We simulate a heavy-ion collision using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory (Cb-TDHFB) treating pairing correlation in the three-dimensional coordinate space. We apply the Cb-TDHFB to 22O+22O collision with a contact-type pairing energy functional, and compare results of Cb-TDHFB and TDHF to investigate the effects of pairing correlations in nuclear fusion. Our results seem to indicate that pairing effects do not increase the fusion cross section in this system.

Ebata, Shuichiro

2013-01-01T23:59:59.000Z

19

Subbarrier fusion reactions and many-particle quantum tunneling  

E-Print Network (OSTI)

Low energy heavy-ion fusion reactions are governed by quantum tunneling through the Coulomb barrier formed by a strong cancellation of the repulsive Coulomb force with the attractive nuclear interaction between the colliding nuclei. Extensive experimental as well as theoretical studies have revealed that fusion reactions are strongly influenced by couplings of the relative motion of the colliding nuclei to several nuclear intrinsic motions. Heavy-ion subbarrier fusion reactions thus provide a good opportunity to address a general problem on quantum tunneling in the presence of couplings, which has been a popular subject in the past decades in many branches of physics and chemistry. Here we review theoretical aspects of heavy-ion subbarrier fusion reactions from the view point of quantum tunneling in systems with many degrees of freedom. Particular emphases are put on the coupled-channels approach to fusion reactions, and the barrier distribution representation for multi-channel penetrability. We also discuss an application of the barrier distribution method to elucidation of the mechanism of dissociative adsorption of H$_2$ melecules in surface science.

K. Hagino; N. Takigawa

2012-09-28T23:59:59.000Z

20

Using Nuclear Fusion Reactions to Peer Inside the Core of a Dense...  

Office of Science (SC) Website

Using Nuclear Fusion Reactions to Peer Inside the Core of a Dense Hot Plasma Fusion Energy Sciences (FES) FES Home About Research Facilities Science Highlights Benefits of FES...

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Excitation of promising nuclear fusion reactions in picosecond laser plasmas  

SciTech Connect

The results of experiments devoted to studying the excitation of the promising nuclear fusion reactions {sup 6}Li(d, {alpha}){sup 4}He, {sup 3}He(d, p){sup 4}He, {sup 11}B(p, 3{alpha}), and {sup 7}Li(p, {alpha}){sup 4}He, along with the standard reaction D(d, n){sup 3}He, in picosecond laser plasmas are presented. For the first time, it was shown that these reactions may proceed at a moderate laser-radiation intensity of 2 x 10{sup 18} W/cm{sup 2}, the respective yield being 2 x 10{sup 3} to 10{sup 5} per laser pulse. A brief survey of the main processes responsible for the generation of fast electrons and fast ions (protons) at the front surface of the target and for the excitation of nuclear fusion reactions is given. The calculated and experimental results on the yield from nuclear fusion reactions in picosecond laser plasmas are compared. The possibilities for optimizing the yield from the promising fusion reactions excited in femto- and picosecond laser plasmas are discussed.

Belyaev, V. S.; Vinogradov, V. I.; Matafonov, A. P., E-mail: Matafonov@mtu-net.ru; Rybakov, S. M. [Central Research Institute of Machine Building (Russian Federation); Krainov, V. P. [Moscow Institute for Physics and Technology (State University) (Russian Federation); Lisitsa, V. S. [Russian Research Centre Kurchatov Institute, Institute of Nuclear Fusion (Russian Federation); Andrianov, V. P.; Ignatiev, G. N. [Research Institute for Pulse Technology (NIIPT) (Russian Federation); Bushuev, V. S.; Gromov, A. I.; Rusetsky, A. S.; Dravin, V. A. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation)

2009-07-15T23:59:59.000Z

22

Formation of superheavy nuclei in cold fusion reactions  

E-Print Network (OSTI)

Within the concept of the dinuclear system (DNS), a dynamical model is proposed for describing the formation of superheavy nuclei in complete fusion reactions by incorporating the coupling of the relative motion to the nucleon transfer process. The capture of two heavy colliding nuclei, the formation of the compound nucleus and the de-excitation process are calculated by using an empirical coupled channel model, solving a master equation numerically and applying statistical theory, respectively. Evaporation residue excitation functions in cold fusion reactions are investigated systematically and compared with available experimental data. Maximal production cross sections of superheavy nuclei in cold fusion reactions with stable neutron-rich projectiles are obtained. Isotopic trends in the production of the superheavy elements Z=110, 112, 114, 116, 118 and 120 are analyzed systematically. Optimal combinations and the corresponding excitation energies are proposed.

Feng, Zhao-Qing; Li, Jun-Qing; Scheid, Werner

2007-01-01T23:59:59.000Z

23

Formation of superheavy nuclei in cold fusion reactions  

E-Print Network (OSTI)

Within the concept of the dinuclear system (DNS), a dynamical model is proposed for describing the formation of superheavy nuclei in complete fusion reactions by incorporating the coupling of the relative motion to the nucleon transfer process. The capture of two heavy colliding nuclei, the formation of the compound nucleus and the de-excitation process are calculated by using an empirical coupled channel model, solving a master equation numerically and applying statistical theory, respectively. Evaporation residue excitation functions in cold fusion reactions are investigated systematically and compared with available experimental data. Maximal production cross sections of superheavy nuclei in cold fusion reactions with stable neutron-rich projectiles are obtained. Isotopic trends in the production of the superheavy elements Z=110, 112, 114, 116, 118 and 120 are analyzed systematically. Optimal combinations and the corresponding excitation energies are proposed.

Zhao-Qing Feng; Gen-Ming Jin; Jun-Qing Li; Werner Scheid

2007-10-17T23:59:59.000Z

24

Fusion Reactions in Self-Colliding Orbits  

Science Journals Connector (OSTI)

A principle for a small nonplasma fusion device is proposed. Energetic ions are injected through the center of a Precetron-type magnetic field. An organized non-Maxwellian mixture ("migma") of particles having a central high-density region results. The collisions are predominantly head-on and Coulomb scattering effects significantly reduced. It is shown that the device can become critical, although, in the examples considered here, only at microwatt levels.

Bogdan C. Magli?; John P. Blewett; Anthony P. Colleraine; W. Craig Harrison

1971-10-04T23:59:59.000Z

25

Fusion Hindrance and Quasi-Fission in 48Ca Induced Reactions  

Science Journals Connector (OSTI)

...February 2004 research-article Articles Fusion Hindrance and Quasi-Fission in 48Ca Induced Reactions...INFN-Sezione di Napoli, I-80126, Napoli, Italy. Fusion-fission and fusion-evaporation cross sections have been measured in......

Monica Trotta; A. M. Stefanini; B. R. Behera; L. Corradi; E. Fioretto; A. Gadea; S. Szilner; Y. W. Wu; S. Beghini; G. Montagnoli; F. Scarlassara; A. Yu. Chizhov; I. M. Itkis; G. N. Kniajeva; N. A. Kondratiev; E. M. Kozulin; I. V. Pokrovsky; R. N. Sagaidak; V. M. Voskressensky; F. Haas; N. Rowley

2004-02-01T23:59:59.000Z

26

E-Print Network 3.0 - actinide-based complete-fusion reactions...  

NLE Websites -- All DOE Office Websites (Extended Search)

fusion reactions. The yields of superheavies with Z > 118 are sensitive... physics. The cold Pb- and Bi-based 1 and hot actinide-based 2 complete fusion reactions were...

27

Nucleus-nucleus cold fusion reactions analyzed with the l-dependent 'fusion by diffusion' model  

SciTech Connect

We present a modified version of the Fusion by Diffusion (FBD) model aimed at describing the synthesis of superheavy nuclei in cold fusion reactions, in which a low excited compound nucleus emits only one neutron. The modified FBD model accounts for the angular momentum dependence of three basic factors determining the evaporation residue cross section: the capture cross section {sigma}{sub cap}(l), the fusion probability P{sub fus}(l), and the survival probability P{sub surv}(l). The fusion hindrance factor, the inverse of P{sub fus}(l), is treated in terms of thermal fluctuations in the shape degrees of freedom and is expressed as a solution of the Smoluchowski diffusion equation. The l dependence of P{sub fus}(l) results from the l-dependent potential energy surface of the colliding system. A new parametrization of the distance of starting point of the diffusion process is introduced. An analysis of a complete set of 27 excitation functions for production of superheavy nuclei in cold fusion reactions, studied in experiments at GSI Darmstadt, RIKEN Tokyo, and LBNL Berkeley, is presented. The FBD model satisfactorily reproduces shapes and absolute cross sections of all the cold fusion excitation functions. It is shown that the peak position of the excitation function for a given 1n reaction is determined by the Q value of the reaction and the height of the fission barrier of the final nucleus. This fact could possibly be used in future experiments (with well-defined beam energy) for experimental determination of the fission barrier heights.

Cap, T.; Siwek-Wilczynska, K.; Wilczynski, J. [Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoza 69, PL-00-681 Warsaw (Poland); Andrzej Soltan Institute for Nuclear Studies, PL-05-400 Otwock-Swierk (Poland)

2011-05-15T23:59:59.000Z

28

Complete fusion in 7Li+144,152Sm reactions  

Science Journals Connector (OSTI)

Complete fusion cross sections for 7Li+144,152Sm reactions have been measured at energies around the Coulomb barrier by offline ?-counting technique. Measured cross sections for the above two reactions are found to be similar at energies well above the Coulomb barrier, however, at sub-barrier energies the cross sections for the 7Li+152Sm system are much higher compared to the 7Li+144Sm system, manifesting the effect of target deformation. Cross sections for the present reactions at above-barrier energies are found to be larger than previously measured reactions involving 6Li projectile with the same targets, possibly due to smaller breakup probability of 7Li than 6Li. Coupled-channels calculations show that the experimental fusion cross sections for both the systems are enhanced at subbarrier energies and suppressed at above-barrier energies compared to the respective one-dimensional barrier penetration model predictions. The calculations by different models show that the measured complete fusion cross sections at above-barrier energies are suppressed up to ?25% compared to the theoretical predictions. It also reveals that a large part of the suppression could be due to inelastic and transfer coupling.

P. K. Rath, S. Santra, N. L. Singh, B. K. Nayak, K. Mahata, R. Palit, K. Ramachandran, S. K. Pandit, A. Parihari, A. Pal, S. Appannababu, Sushil K. Sharma, D. Patel, and S. Kailas

2013-10-28T23:59:59.000Z

29

Mapping from quasi-elastic scattering to fusion reactions  

E-Print Network (OSTI)

The fusion barrier distribution has provided a nice representation for the channel coupling effects on heavy-ion fusion reactions at energies around the Coulomb barrier. Here we discuss how one can extract the same representation using the so called sum-of-differences (SOD) method with quasi-elastic scattering cross sections. In contrast to the conventional quasi-elastic barrier distribution, the SOD barrier distribution has an advantage in that it can be applied both to non-symmetric and symmetric systems. It is also the case that the correspondence to the fusion barrier distribution is much better than the quasi-elastic barrier distribution. We demonstrate its usefulness by studying $^{16}$O+$^{144}$Sm, $^{58}$Ni+$^{58}$Ni, and $^{12}$C+$^{12}$C systems.

K. Hagino; N. Rowley

2014-03-06T23:59:59.000Z

30

Repulsive aspects of pairing correlation in nuclear fusion reaction  

E-Print Network (OSTI)

Numerical simulation on nuclear collisions are performed using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory (Cb-TDHFB) in the three-dimensional coordinate space. Comparing results of the Cb-TDHFB and the conventional time-dependent Hartree-Fock (TDHF) calculations, we study effects of the pairing correlation on fusion reaction of $^{22}$O+$^{22}$O, $^{52}$Ca+$^{52}$Ca, and $^{22}$O+$^{52}$Ca, using the Skyrme SkM$^*$ functional and a contact-type pairing energy functional. Although current results are yet preliminary, they may suggest that the pairing correlation could hinder the fusion probability at energies in the vicinity of the Coulomb barrier height. We also perform a calculation for heavier nuclei, $^{96}$Zn+$^{124}$Sn, which seems to suggest a similar hindrance effect.

Shuichiro Ebata; Takashi Nakatsukasa

2014-08-08T23:59:59.000Z

31

Repulsive aspects of pairing correlation in nuclear fusion reaction  

E-Print Network (OSTI)

Numerical simulation on nuclear collisions are performed using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory (Cb-TDHFB) in the three-dimensional coordinate space. Comparing results of the Cb-TDHFB and the conventional time-dependent Hartree-Fock (TDHF) calculations, we study effects of the pairing correlation on fusion reaction of $^{22}$O+$^{22}$O, $^{52}$Ca+$^{52}$Ca, and $^{22}$O+$^{52}$Ca, using the Skyrme SkM$^*$ functional and a contact-type pairing energy functional. Although current results are yet preliminary, they may suggest that the pairing correlation could hinder the fusion probability at energies in the vicinity of the Coulomb barrier height. We also perform a calculation for heavier nuclei, $^{96}$Zn+$^{124}$Sn, which seems to suggest a similar hindrance effect.

Ebata, Shuichiro

2014-01-01T23:59:59.000Z

32

Neutron detector for fusion reaction-rate measurements  

SciTech Connect

We have developed a fast, sensitive neutron detector for recording the fusion reaction-rate history of inertial-confinement fusion (ICF) experiments. The detector is based on the fast rise-time of a commercial plastic scintillator (BC-422) and has a response < 25-ps FWHM. A thin piece of scintillator material acts as a neutron-to- light converter. A zoom lens images light from the scintillator surface to a high-speed (15 ps) optical streak camera for recording. The zoom lens allows the scintillator to be positioned between 1 and 50 cm from a target. The camera simulaneously records an optical fiducial pulse which allows the camera time base to be calibrated relative to the incident laser power. Bursts of x rays formed by focusing 20-ps, 2.5-TW laser pulses onto gold disk targets demonstrate the detector resolution to be < 25 ps. We have recorded burn histories for deuterium/tritium-filled targets producing as few as 3 {times} 10{sup 7} neutrons.

Lerche, R.A.; Phillion, D.W.; Tietbohl, G.L.

1993-09-03T23:59:59.000Z

33

On the nuclear interaction. Potential, binding energy and fusion reaction  

E-Print Network (OSTI)

The nuclear interaction is responsible for keeping neutrons and protons joined in an atomic nucleus. Phenomenological nuclear potentials, fitted to experimental data, allow one to know about the nuclear behaviour with more or less success where quantum mechanics is hard to be used. A nuclear potential is suggested and an expression for the potential energy of two nuclear entities, either nuclei or nucleons, is developed. In order to estimate parameters in this expression, some nucleon additions to nuclei are considered and a model is suggested as a guide of the addition process. Coulomb barrier and energy for the addition of a proton to each one of several nuclei are estimated by taking into account both the nuclear and electrostatic components of energy. Studies on the binding energies of several nuclei and on the fusion reaction of two nuclei are carried out.

I. Casinos

2008-05-22T23:59:59.000Z

34

Fusion by diffusion. II. Synthesis of transfermium elements in cold fusion reactions  

Science Journals Connector (OSTI)

We describe a method of estimating cross sections for the synthesis of very heavy nuclei by the fusion of two lighter ones. The cross section is considered to be the product of three factors: the cross section for the projectile to overcome the Coulomb barrier, the probability that the resulting composite nucleus reaches the compound nucleus configuration by a shape fluctuation treated as a diffusion of probability in one dimension, and the probability that the excited compound nucleus survives fission. Semi-empirical formulas for the mean Coulomb barrier height and its distribution around the mean are constructed. After overcoming the Coulomb barrier the system is assumed to be injected into an “asymmetric fission valley” by a rapid growth of the neck between the target and projectile at approximately frozen asymmetry and elongation. Diffusion in the elongation coordinate in this valley can occasionally bring the system over the saddle separating the injection point from the compound nucleus configuration. This is the stage that accounts for the hindrance to fusion observed for very heavy reacting systems. The competition between deexcitation of the compound nucleus by neutron emission and fission is treated by standard methods, but an interesting insight allows one to predict in an elementary way the location of the maximum in the resulting excitation function. Adjusting one parameter in the theory causes the calculated peak cross sections to agree within about a factor of 2 or so with 12 measured or estimated values for “cold” one-neutron-out reactions where targets of Pb208 and Bi209 are bombarded with projectiles ranging from Ca48 to Zn70. The centroids of the excitation functions agree with theory to within 1 or 2 MeV for the six cases where they have been determined, and their widths are reproduced. “Hot” fusion reactions, where several neutrons are emitted, are not treated, except that a comparison is made between the hindrance factors in cold and hot reactions to make elements with atomic numbers 112 to 118. The calculated diffusive hindrances in the hot reactions are less unfavorable by 4 to 5 orders of magnitude.

W. J. ?wi?tecki; K. Siwek-Wilczy?ska; J. Wilczy?ski

2005-01-07T23:59:59.000Z

35

Applications of Skyrme energy-density functional to fusion reactions for synthesis of superheavy nuclei  

SciTech Connect

The Skyrme energy-density functional approach has been extended to study massive heavy-ion fusion reactions. Based on the potential barrier obtained and the parametrized barrier distribution the fusion (capture) excitation functions of a lot of heavy-ion fusion reactions are studied systematically. The average deviations of fusion cross sections at energies near and above the barriers from experimental data are less than 0.05 for 92% of 76 fusion reactions with Z{sub 1}Z{sub 2}<1200. For the massive fusion reactions, for example, the {sup 238}U-induced reactions and {sup 48}Ca+{sup 208}Pb, the capture excitation functions have been reproduced remarkably well. The influence of structure effects in the reaction partners on the capture cross sections is studied with our parametrized barrier distribution. By comparing the reactions induced by double-magic nucleus {sup 48}Ca and by {sup 32}S and {sup 35}Cl, the ''threshold-like'' behavior in the capture excitation function for {sup 48}Ca-induced reactions is explored and an optimal balance between the capture cross section and the excitation energy of the compound nucleus is studied. Finally, the fusion reactions with {sup 36}S, {sup 37}Cl, {sup 48}Ca, and {sup 50}Ti bombarding {sup 248}Cm, {sup 247,249}Bk, {sup 250,252,254}Cf, and {sup 252,254}Es, as well as the reactions leading to the same compound nucleus with Z=120 and N=182, are studied further. The calculation results for these reactions are useful for searching for the optimal fusion configuration and suitable incident energy in the synthesis of superheavy nuclei.

Wang Ning; Scheid, Werner [Institute for Theoretical Physics at Justus-Liebig-University, D-35392 Giessen (Germany); Wu Xizhen; Liu Min [China Institute of Atomic Energy, Beijing 102413 (China); Li Zhuxia [China Institute of Atomic Energy, Beijing 102413 (China); Institute of Theoretical Physics, Chinese Academic of Science, Beijing 100080 (China); Nuclear Theory Center of National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 (China)

2006-10-15T23:59:59.000Z

36

Charge exchange reaction by Reggeon exchange and W$^{+}$W$^{-}$-fusion  

E-Print Network (OSTI)

Charge exchange reactions at high energies are examined. The existing cross section data on the Reggeon induced reaction pp $\\rightarrow$ n + $\\Delta^{++}$ taken at the ZGS and ISR accelerators are extrapolated to the energies of the RHIC and LHC colliders. The interest in the charge exchange reaction induced by $W^{\\pm}$-fusion is presented, and the corresponding QCD-background is examined.

Schicker, R

2014-01-01T23:59:59.000Z

37

Does the Sun Shine by pp or CNO Fusion Reactions? John N. Bahcall *  

E-Print Network (OSTI)

the recent KamLAND measurements) to the fraction of energy that the Sun produces via the CNO fusion cycle­Kamiokande [13], provide information about neutrinos but only those that have energies well above the maximumDoes the Sun Shine by pp or CNO Fusion Reactions? John N. Bahcall * School of Natural Sciences

Bahcall, John

38

Does the Sun Shine by pp or CNO Fusion Reactions? John N. Bahcall*  

E-Print Network (OSTI)

the recent KamLAND measurements) to the fraction of energy that the Sun produces via the CNO fusion cycle-Kamiokande [13], provide information about neutrinos but only those that have energies well above the maximumDoes the Sun Shine by pp or CNO Fusion Reactions? John N. Bahcall* School of Natural Sciences

Bahcall, John

39

Fusion reactions initiated by laser-accelerated particle beams in a laser-produced plasma  

E-Print Network (OSTI)

The advent of high-intensity pulsed laser technology enables the generation of extreme states of matter under conditions that are far from thermal equilibrium. This in turn could enable different approaches to generating energy from nuclear fusion. Relaxing the equilibrium requirement could widen the range of isotopes used in fusion fuels permitting cleaner and less hazardous reactions that do not produce high energy neutrons. Here we propose and implement a means to drive fusion reactions between protons and boron-11 nuclei, by colliding a laser-accelerated proton beam with a laser-generated boron plasma. We report proton-boron reaction rates that are orders of magnitude higher than those reported previously. Beyond fusion, our approach demonstrates a new means for exploring low-energy nuclear reactions such as those that occur in astrophysical plasmas and related environments.

Labaune, C; Depierreux, S; Goyon, C; Loisel, G; Yahia, V; Rafelski, J

2013-01-01T23:59:59.000Z

40

Observation of neutronless fusion reactions in picosecond laser plasmas V. S. Belyaev, A. P. Matafonov, and V. I. Vinogradov  

E-Print Network (OSTI)

, Russia V. S. Lisitsa Institute of Nuclear Fusion, RSC "Kurchatov Institute," 123182 Moscow, Russia A. SObservation of neutronless fusion reactions in picosecond laser plasmas V. S. Belyaev, A. P fusion reactions 11 B+p in plasmas produced by picosecond laser pulses with the peak intensity of 2 1018

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Nuclear Matter Incompressibility Effect on the Cross Section of Fusion Reactions with a weakly bound projectile  

E-Print Network (OSTI)

Fusion reactions with a weakly bound projectile are studied using the double-folding model along with a repulsive interaction modifying term. Using this modified potential, including nuclear matter incompressibility effects, the fusion reaction cross sections and suppression parameters are calculated for 9Be +209Bi,208Pb,29Si and 27Al reactions. The results show that applying these effects at energies near the Coulomb barrier improves the agreement between the calculated and experimental cross sections, and modifies the mean values of the suppression parameter.

Seyyedi, S A

2015-01-01T23:59:59.000Z

42

Nuclear Matter Incompressibility Effect on the Cross Section of Fusion Reactions with a weakly bound projectile  

E-Print Network (OSTI)

Fusion reactions with a weakly bound projectile are studied using the double-folding model along with a repulsive interaction modifying term. Using this modified potential, including nuclear matter incompressibility effects, the fusion reaction cross sections and suppression parameters are calculated for 9Be +209Bi,208Pb,29Si and 27Al reactions. The results show that applying these effects at energies near the Coulomb barrier improves the agreement between the calculated and experimental cross sections, and modifies the mean values of the suppression parameter.

S. A. Seyyedi; H. Golnarkar

2015-01-19T23:59:59.000Z

43

Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier  

E-Print Network (OSTI)

The present understanding of reaction processes involving light unstable nuclei at energies around the Coulomb barrier is reviewed. The effect of coupling to direct reaction channels on elastic scattering and fusion is investigated, with the focus on halo nuclei. A list of definitions of processes is given, followed by a review of the experimental and theoretical tools and information presently available. The effect of couplings on elastic scattering and fusion is studied with a series of model calculations within the coupled-channels framework. The experimental data on fusion are compared to "bare" no-coupling one-dimensional barrier penetration model calculations. On the basis of these calculations and comparisons with experimental data, conclusions are drawn from the observation of recurring features. The total fusion cross sections for halo nuclei show a suppression with respect to the "bare" calculations at energies just above the barrier that is probably due to single neutron transfer reactions. The data for total fusion are also consistent with a possible sub-barrier enhancement; however, this observation is not conclusive and other couplings besides the single-neutron channels would be needed in order to explain any actual enhancement. We find that a characteristic feature of halo nuclei is the dominance of direct reactions over fusion at near and sub-barrier energies; the main part of the cross section is related to neutron transfers, while calculations indicate only a modest contribution from the breakup process.

N. Keeley; R. Raabe; N. Alamanos; J. L. Sida

2007-02-16T23:59:59.000Z

44

Synthesis of transactinide nuclei in cold fusion reactions using radioactive beams  

SciTech Connect

Chances of synthesis of transactinide nuclei in cold fusion reactions (one-neutron-out reactions) using radioactive beams are evaluated. Because in most of the cases intensities of radioactive beams are significantly less than those of the stable beams, reactions with the greatest radioactive-beam intensities for the particular elements are considered. The results are compared with the recent ones obtained by Loveland [Phys. Rev. C 76, 014612 (2007)], who investigated the same nuclei.

Smolanczuk, Robert [Theoretical Physics Department, Soltan Institute for Nuclear Studies, Hoza 69, PL-00-681 Warszawa (Poland)

2010-06-15T23:59:59.000Z

45

Synthesis of transactinide nuclei in cold fusion reactions using radioative beams  

E-Print Network (OSTI)

Chances of synthesis of transactinide nuclei in cold fusion reactions (one-neutron-out) reactions using radioactive beams are evaluated. Because intensities of radioactive beams are in most of the cases significantly lower than the ones of the stable beams, reactions with the highest radioactive beam intensities for the particular elements are considered. The results are compared with the recent ones obtained by Loveland who investigated the same nuclei.

Smolanczuk, Robert

2009-01-01T23:59:59.000Z

46

Synthesis of transactinide nuclei in cold fusion reactions using radioative beams  

E-Print Network (OSTI)

Chances of synthesis of transactinide nuclei in cold fusion reactions (one-neutron-out) reactions using radioactive beams are evaluated. Because intensities of radioactive beams are in most of the cases significantly lower than the ones of the stable beams, reactions with the highest radioactive beam intensities for the particular elements are considered. The results are compared with the recent ones obtained by Loveland who investigated the same nuclei.

Robert Smolanczuk

2009-12-04T23:59:59.000Z

47

The Dynamical Dipole Mode in Fusion Reactions with Exotic Nuclear Beams  

E-Print Network (OSTI)

We report the properties of the prompt dipole radiation, produced via a collective bremsstrahlung mechanism, in fusion reactions with exotic beams. We show that the gamma yield is sensitive to the density dependence of the symmetry energy below/around saturation. Moreover we find that the angular distribution of the emitted photons from such fast collective mode can represent a sensitive probe of its excitation mechanism and of fusion dynamics in the entrance channel.

V. Baran; C. Rizzo; M. Colonna; M. Di Toro; D. Pierroutsakou

2009-02-09T23:59:59.000Z

48

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Achieving Fusion Conditions Achieving Fusion Conditions CPEP: Online Fusion Course Main Topics Energy Sources and Conversions Two Key Fusion Reactions How Fusion Reactions Work Creating the Conditions for Fusion Plasmas - the 4th State of Matter Achieving Fusion Conditions More Info About CPEP Fusion Chart Images: English + 6 More Languages Main CPEP Web Site Printed Charts in 3 Sizes Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Overview | The Guided Tour Achieving Fusion Conditions EXPERIMENTAL RESULTS IN FUSION RESEARCH Both inertial and magnetic confinement fusion research have focused on understanding plasma confinement and heating. This research has led to increases in plasma temperature, T, density, n, and energy confinement

49

Fusion cross sections for the Be9+Sn124 reaction at energies near the Coulomb barrier  

Science Journals Connector (OSTI)

The complete and incomplete fusion cross sections for Be9+Sn124 reaction have been deduced using the online ?-ray measurement technique. Complete fusion at energies above the Coulomb barrier was found to be suppressed by ~28% compared to the coupled-channels calculations and is in agreement with the systematics of L. R. Gasques et al. [Phys. Rev. C 79, 034605 (2009)]. Study of the projectile dependence for fusion on a Sn124 target shows that, for Be9 nuclei, the enhancement at below-barrier energies is substantial compared to that of tightly bound nuclei.

V. V. Parkar, R. Palit, Sushil K. Sharma, B. S. Naidu, S. Santra, P. K. Joshi, P. K. Rath, K. Mahata, K. Ramachandran, T. Trivedi, and A. Raghav

2010-11-03T23:59:59.000Z

50

Function of a key morphological innovation: fusion of the cichlid pharyngeal jaw  

Science Journals Connector (OSTI)

...other pharyngeal jaw type (papilliform) utilizes...greater pharyngeal jaw fusion is important in adapting...manipulating prey, less fusion might facilitate independent...all have limited LPJ fusion (Kullander 1998...exploit both large prey types such as fishes as well...

2006-01-01T23:59:59.000Z

51

Suppression of complete fusion in the Li6+Sm144 reaction  

Science Journals Connector (OSTI)

Complete fusion excitation function for the Li6+Sm144 reaction has been measured at near barrier energies by the activation technique. Coupled-channel calculations show an enhancement in fusion cross section at energies below the barrier compared to the one-dimensional barrier penetration model calculation, but they overpredict it in the entire energy range compared to the experimental data. Reduced fusion cross sections for the present system at energies normalized to the Coulomb barrier were also found to be systematically lower than those with strongly bound projectiles forming a similar compound nucleus. These two observations conclusively show that the complete fusion cross section, at above barrier energies, is suppressed by ~32% in the Li6+Sm144 reaction. Reanalyses of existing fusion data for Li7+Ho165 and Li7+Tb159 also show a suppression compared to those with strongly bound projectiles, which contradicts earlier conclusions. The fusion suppression factor seems to exhibit a systematic behavior with respect to the breakup threshold of the projectile and the atomic number of the target nucleus.

P. K. Rath, S. Santra, N. L. Singh, R. Tripathi, V. V. Parkar, B. K. Nayak, K. Mahata, R. Palit, Suresh Kumar, S. Mukherjee, S. Appannababu, and R. K. Choudhury

2009-05-11T23:59:59.000Z

52

Absorption-Fluctuation Theorem for Nuclear Reactions: Brink-Axel, Incomplete Fusion and All That  

E-Print Network (OSTI)

We discuss the connection between absorption, averages and fluctuations in nuclear reactions. The fluctuations in the entrance channel result in the compound nucleus, Hauser-Feshbach, cross section, the fluctuations in the intermediate channels, result in modifications of multistep reaction cross sections, while the fluctuations in the final channel result in hybrid cross sections that can be used to describe incomplete fusion reactions. We discuss the latter in details and comment on the validity of the assumptions used in the develpoment of the Surrogate method. We also discuss the theory of multistep reactions with regards to intermediate state fluctuations and the energy dependence and non-locality of the intermediate channels optical potentials.

M. S. Hussein

2007-12-18T23:59:59.000Z

53

VII. Nuclear Chemistry (Chapter 17) A. Modes of radioactive decay, nuclear reactions, fission, fusion  

E-Print Network (OSTI)

40 VII. Nuclear Chemistry (Chapter 17) A. Modes of radioactive decay, nuclear reactions, fission #12;41 These masses are not exactly integer multiples due to nuclear interactions between the protons differences via the famous formula E = mc2 . Nuclear Fusion! For example, if you combine 2 protons and two

54

Oppenheimer-Phillips effect and electron screening ind+ d fusion reactions  

Science Journals Connector (OSTI)

Thed(d, n) 3He andd(d,p)t fusion reactions have been studied at center-of-mass energies E=1.6 to 130 keV using intense beam currents from 30, 100, and 450 kV accelerators in combination with detec...

U. Greife; F. Gorris; M. Junker; C. Rolfs…

1995-01-01T23:59:59.000Z

55

Fusion reactions involving radioactive beams at GANIL. Gilles de France  

E-Print Network (OSTI)

. In the first case, the high energy beam from the second cyclotron is fragmented onto a target (the production efficiently refocus the species after their production by the fragmentation mechanism, and to optimise energy reaction mechanism) at the Coulomb barrier are possible with that kind of beams. RIBs like 76 Kr

Paris-Sud XI, Université de

56

Nuclear fusion reaction rates for strongly coupled ionic mixtures  

SciTech Connect

We analyze the effect of plasma screening on nuclear reaction rates in dense matter composed of atomic nuclei of one or two types. We perform semiclassical calculations of the Coulomb barrier penetrability taking into account a radial mean-field potential of plasma ions. The mean-field potential is extracted from the results of extensive Monte Carlo calculations of radial pair distribution functions of ions in binary ionic mixtures. We calculate the reaction rates in a wide range of plasma parameters and approximate these rates by an analytical expression that is expected to be applicable to multicomponent ion mixtures. Also, we analyze Gamow-peak energies of reacting ions in various nuclear burning regimes. For illustration, we study nuclear burning in {sup 12}C-{sup 16}O mixtures.

Chugunov, A. I.; DeWitt, H. E. [Ioffe Physical-Technical Institute, Politekhnicheskaya 26, RU-194021 St. Petersburg (Russian Federation); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2009-07-15T23:59:59.000Z

57

Intimations of neck formation in heavy-ion subbarrier fusion reactions  

SciTech Connect

Since the observed fusion cross sections for collisions between heavy ions at subbarrier energies are orders of magnitude larger than would be expected for barrier tunnelling, one is faced with the task of identifying the basic force which is strong enough to overcome the strong Coulomb force and bring about fusion. The two possibilities seem to be excursions of the nuclear surface (and strong nuclear force) due to collective motions of the colliding nuclei and formation of a neck of nuclear matter. The first possibility has received the most attention. However, the systematics of fusion cross sections suggest neck formation is playing an important role. Neck formation can also result in a reseparation of the composite system and we review the experimental information on these reactions at barrier and subbarrier energies. 15 refs., 18 figs.

Stelson, P.H.

1990-07-01T23:59:59.000Z

58

PPPL to launch major upgrade of key fusion energy test facility...  

NLE Websites -- All DOE Office Websites (Extended Search)

the next stage of its mission to chart an attractive course for the development of nuclear fusion as a clean, safe and abundant fuel for generating electricity. The project will...

59

Finding Fusion  

Science Journals Connector (OSTI)

Finding Fusion ... Study of these reactions will advance understanding of the workings of stars and giant planets, fusion energy, and nuclear weapon stockpiles. ...

JYLLIAN KEMSLEY

2012-09-10T23:59:59.000Z

60

Fusion cross sections for 6,7Li + 24Mg reactions at energies below and above the barrier  

E-Print Network (OSTI)

Measurement of fusion cross sections for the 6,7Li + 24Mg reactions by the characteristic gamma-ray method has been done at energies from below to well above the respective Coulomb barriers. The fusion cross sections obtained from these gamma-ray cross sections for the two systems are found to agree well with the total reaction cross sections at low energies. The decrease of fusion cross sections with increase of energy is consistent with the fact that other channels, in particular breakup open up with increase of bombarding energy. This shows that there is neither inhibition nor enhancement of fusion cross sections for these systems at above or below the barrier. The critical angular momenta (lcr) deduced from the fusion cross sections are found to have an energy dependence similar to other Li - induced reactions.

M. Ray; A. Mukherjee; M. K. Pradhan; Ritesh Kshetri; M. Saha Sarkar; R. Palit; I. Majumdar; P. K. Joshi; H. C. Jain; B. Dasmahapatra

2008-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Excitation functions for Fr208–211 produced in the O18+Au197 fusion reaction  

Science Journals Connector (OSTI)

Excitation functions for Fr208–211 isotopes produced in the O18+Au197 fusion-evaporation reaction have been measured at Elab=75–130 MeV via characteristic ? decays by means of an electrostatic deflector and a semiconductor detector. Data have been compared with calculations giving barrier-passing (capture) cross sections and probabilities of the compound nucleus decay into different channels according to the standard statistical model.

L. Corradi; B. R. Behera; E. Fioretto; A. Gadea; A. Latina; A. M. Stefanini; S. Szilner; M. Trotta; Y. Wu; S. Beghini; G. Montagnoli; F. Scarlassara; R. N. Sagaidak; S. N. Atutov; B. Mai; G. Stancari; L. Tomassetti; E. Mariotti; A. Khanbekyan; S. Veronesi

2005-01-27T23:59:59.000Z

62

From nucleons to nuclei to fusion reactions S. Quaglioni1, P. Navratil2,1, R. Roth3, and W. Horiuchi4  

E-Print Network (OSTI)

reactions. Providing the research community with accurate nuclear fusion data is one of the longstanding and ionized state of matter at which they take place, nuclear fusion reactions can be very challenging or even as fusion- experiment simulations rely on various nuclear input data such as cross sections (or

Roth, Robert

63

Energy-Dependence of Nucleus-Nucleus Potential and Friction Parameter in Fusion Reactions  

E-Print Network (OSTI)

Applying a macroscopic reduction procedure on the improved quantum molecular dynamics (ImQMD) model, the energy dependences of the nucleus-nucleus potential, the friction parameter, and the random force characterizing a one-dimensional Langevin-type description of the heavy-ion fusion process are investigated. Systematic calculations with the ImQMD model show that the fluctuation-dissipation relation found in the symmetric head-on fusion reactions at energies just above the Coulomb barrier fades out when the incident energy increases. It turns out that this dynamical change with increasing incident energy is caused by a specific behavior of the friction parameter which directly depends on the microscopic dynamical process, i.e., on how the collective energy of the relative motion is transferred into the intrinsic excitation energy. It is shown microscopically that the energy dissipation in the fusion process is governed by two mechanisms: One is caused by the nucleon exchanges between two fusing nuclei, and the other is due to a rearrangement of nucleons in the intrinsic system. The former mechanism monotonically increases the dissipative energy and shows a weak dependence on the incident energy, while the latter depends on both the relative distance between two fusing nuclei and the incident energy. It is shown that the latter mechanism is responsible for the energy dependence of the fusion potential and explains the fading out of the fluctuation-dissipation relation.

Kai Wen; Fumihiko Sakata; Zhu-Xia Li; Xi-Zhen Wu; Ying-Xun Zhang; Shan-Gui Zhou

2014-07-22T23:59:59.000Z

64

Fusion reactions with the one-neutron halo nucleus 15C  

E-Print Network (OSTI)

The structure of 15C, with an s1/2 neutron weakly bound to a closed-neutron shell nucleus 14C, makes it a prime candidate for a one-neutron halo nucleus. We have for the first time studied the cross section for the fusion-fission reaction 15C + 232Th at energies in the vicinity of the Coulomb barrier and compared it to the yield of the neighboring 14C + 232Th system measured in the same experiment. At sub-barrier energies, an enhancement of the fusion yield by factors of 2-5 was observed for 15C, while the cross sections for 14C match the trends measured for 12,13C.

M. Alcorta; K. E. Rehm; B. B. Back; S. Bedoor; P. F. Bertone; C. M. Deibel; B. DiGiovine; H. Esbensen; J. P. Greene; C. R. Hoffmann; C. L. Jiang; J. C. Lighthall; S. T. Marley; R. C. Pardo; M. Paul; A. M. Rogers; C. Ugalde; A. H. Wuosmaa

2011-04-06T23:59:59.000Z

65

Energy-Dependence of Nucleus-Nucleus Potential and Friction Parameter in Fusion Reactions  

E-Print Network (OSTI)

Applying a macroscopic reduction procedure on the improved quantum molecular dynamics (ImQMD), the energy dependences of the nucleus-nucleus potential, the friction parameter, and the random force characterizing a one-dimensional Langevin-type description of the heavy-ion fusion process are investigated. Systematic calculations with the ImQMD show that the fluctuation-dissipation relation found in the symmetric head-on fusion reactions at energies just above the Coulomb barrier fades out when the incident energy increases. It turns out that this dynamical change with increasing incident energy is caused by a specific behavior of the friction parameter which directly depends on the microscopic dynamical process, i.e., on how the collective energy of the relative motion is transferred into the intrinsic excitation energy. It is shown microscopically that the energy dissipation in the fusion process is governed by two mechanisms: One is caused by the nucleon exchanges between two fusing nuclei, and the other is ...

Wen, Kai; Li, Zhu-Xia; Wu, Xi-Zhen; Zhang, Ying-Xun; Zhou, Shan-Gui

2014-01-01T23:59:59.000Z

66

Having played a key role in such powerful reactions as the Mukaiyama aldol and the Nobel prize winning Sharpless  

E-Print Network (OSTI)

, this method actually favors more hindered substrates and is thus complementary to SN2-based methods." This newHaving played a key role in such powerful reactions as the Mukaiyama aldol and the Nobel prize metal salt and thus enhance the rate and selectivity of nucleophilic substitution reactions," explained

Lepore, Salvatore D.

67

Fusion-A Potential Power Source  

Science Journals Connector (OSTI)

Fusion-A Potential Power Source ... Nuclear energy, fusion reactions, magnetic confinement, and tokamaks. ...

Torkil H. Jensen

1994-01-01T23:59:59.000Z

68

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Fluorescent Lights and Neon Signs Fluorescent Lights and Neon Signs CPEP: Online Fusion Course Main Topics Energy Sources and Conversions Two Key Fusion Reactions How Fusion Reactions Work Creating the Conditions for Fusion Plasmas - the 4th State of Matter Achieving Fusion Conditions More Info About CPEP Fusion Chart Images: English + 6 More Languages Main CPEP Web Site Printed Charts in 3 Sizes Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Overview | The Guided Tour Fluorescent Lights and Neon Signs Two of the most common plasma devices on the planet are the fluorescent light bulb, and its cousin, the neon sign. Since their development in the 1940's, fluorescent bulbs have become the lighting fixture of choice in

69

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Sun Sun Layers CPEP: Online Fusion Course Main Topics Energy Sources and Conversions Two Key Fusion Reactions How Fusion Reactions Work Creating the Conditions for Fusion Plasmas - the 4th State of Matter Achieving Fusion Conditions More Info About CPEP Fusion Chart Images: English + 6 More Languages Main CPEP Web Site Printed Charts in 3 Sizes Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Overview | The Guided Tour From Core to Corona Layers of the Sun Image Credit: p. 110,125, Kaler The Core The innermost layer of the sun is the core. With a density of 160 g/cm^3, 10 times that of lead, the core might be expected to be solid. However, the core's temperature of 15 million kelvins (27 million degrees Fahrenheit)

70

Fusion-fission and quasifission in the reactions with heavy ions leading to the formation of Hs  

SciTech Connect

Mass and energy distributions of binary reaction products obtained in the reactions {sup 22}Ne+{sup 249}Cf,{sup 26}Mg+{sup 248}Cm,{sup 36}S+{sup 238}U and {sup 58}Fe+{sup 208}Pb leading to Hs isotopes have been measured. At energies below the Coulomb barrier the bimodal fission of Hs*, formed in the reaction {sup 26}Mg+{sup 248}Cm, is observed. In the reaction {sup 36}S+{sup 238}U the considerable part of the symmetric fragments arises from the quasifission process. At energies above the Coulomb barrier the symmetric fragments originate mainly from fusion-fission process for both reactions with Mg and S ions. In the case of the {sup 58}Fe+{sup 208}Pb reaction the quasifission process dominates at all measured energies. The pre- and post-scission neutron multiplicities as a function of the fragment mass have been obtained for the reactions studied.

Itkis, I. M.; Itkis, M. G.; Knyazheva, G. N.; Kozulin, E. M. [Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)

2012-10-20T23:59:59.000Z

71

Stopping of swift protons in matter and its implication for astrophysical fusion reactions C. A. Bertulani1,2,  

E-Print Network (OSTI)

s : 26.20. f, 34.50.Bw Nuclear fusion reactions proceed in stars at low energies, e.g., of the order sections measured in the labo- ratory with those in a stellar environment. Another screening effect protons in low-energy collisions is investigated. At low projectile energies the stopping is mainly due

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

72

Hydrogen Hydrogen FusionFusionFusionFusionFusionFusion  

E-Print Network (OSTI)

100.000 years LNGS Laboratori Nazionali del Gran Sasso Borexino THE THERMONUCLEAR FUSION REACTIONHydrogen Hydrogen Fusion Deuterium FusionFusionFusionFusionFusionFusion THE SUN AS BOREXINO SEES

Heiz, Ulrich

73

Synthesis of superheavy element 120 via {sup 50}Ti+{sup A}Cf hot fusion reactions  

SciTech Connect

Synthesis of superheavy element 120 in terms of the {sup 50}Ti+{sup 249-252}Cf fusion-evaporation reactions is evaluated and discussed. It is found that the reactions of {sup 250,251}Cf({sup 50}Ti,3n){sup 297,298}120 and {sup 251,252}Cf({sup 50}Ti,4n){sup 297,298}120 are relatively favorable with the maximum evaporation-residue cross sections of 0.12, 0.09, 0.11, and 0.25 pb, respectively. However, {sup 252}Cf may be difficult to be target because its spontaneous fission will bring about serious background in the experiment. Fusion probabilities for different target-projectile combinations leading to the formation of surperheavy nucleus {sup 302}120 are estimated with the ''fusion-by-diffusion'' model and presented as a function of the Coulomb parameter Z{sub 1}Z{sub 2}/(A{sub 1}{sup 1/3}+A{sub 2}{sup 1/3}). Among the reactions {sup 50}Ti+{sup 252}Cf, {sup 54}Cr+{sup 248}Cm, {sup 58}Fe+{sup 244}Pu, and {sup 64}Ni+{sup 238}U, the reaction {sup 50}Ti+{sup 252}Cf has the largest fusion probability. Synthesis of superheavy element 120 is of essential importance for determining whether the magic proton shell should be at Z=114 or at higher proton numbers Z=120-126. Therefore, the experiment to produce isotopes with Z=120 in the fusion reactions {sup 50}Ti+{sup 250,251}Cf is of great interest.

Liu, Z. H. [China Institute of Atomic Energy, Beijing 102413 (China); Bao Jingdong [Department of Physics, Beijing Normal University, Beijing 100875 (China); Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 (China)

2009-11-15T23:59:59.000Z

74

A classical approach in simple nuclear fusion reaction {sub 1}H{sup 2}+{sub 1}H{sup 3} using two-dimension granular molecular dynamics model  

SciTech Connect

Molecular dynamics in 2-D accompanied by granular model provides an opportunity to investigate binding between nuclei particles and its properties that arises during collision in a fusion reaction. A fully classical approach is used to observe the influence of initial angle of nucleus orientation to the product yielded by the reaction. As an example, a simplest fusion reaction between {sub 1}H{sup 2} and {sub 1}H{sup 3} is observed. Several products of the fusion reaction have been obtained, even the unreported ones, including temporary {sub 2}He{sup 4} nucleus.

Viridi, S.; Kurniadi, R.; Waris, A.; Perkasa, Y. S. [Nuclear Physics and Biophysics Research Division, Institut Teknologi Bandung, Bandung 40132 (Indonesia); Doctoral Program in Physics, Institut Teknologi Bandung, Bandung 40132 Physics Department, Universitas Islam Negeri Sunan Gunung Djati, Bandung 40614 (Indonesia)

2012-06-06T23:59:59.000Z

75

Calculation of excitation function of some structural fusion material for (n,p) reactions up to 25 MeV  

E-Print Network (OSTI)

Fusion serves an inexhaustible energy for humankind. Although there have been significant research and development studies on the inertial and magnetic fusion reactor technology, Furthermore, there are not radioactive nuclear waste problems in the fusion reactors. In this study, (n, p) reactions for some structural fusion materials such as 27Al, 51V, 52Cr, 55Mn and 56Fe have been investigated. The new calculations on the excitation functions of 27 Al(n,p) 27 Mg, 51 V(n,p) 51 Ti, 52 Cr(n,p) 52 V, 55 Mn(n,p) 55 Cr and 56 Fe(n,p) 56 Mn reactions have been carried out up to 30 MeV incident neutron energy. Statistical model calculations, based on the Hauser-Feshbach formalism, have been carried out using the TALYS-1.0 and were compared with available experimental data in the literature and with ENDF/B-VII, T=300k; JENDL-3.3, T=300k and JEFF3.1, T=300k evaluated libraries .

Tarik Siddik

2013-03-15T23:59:59.000Z

76

Calculation of excitation function of some structural fusion material for (n,p) reactions up to 25 MeV  

E-Print Network (OSTI)

Fusion serves an inexhaustible energy for humankind. Although there have been significant research and development studies on the inertial and magnetic fusion reactor technology, Furthermore, there are not radioactive nuclear waste problems in the fusion reactors. In this study, (n, p) reactions for some structural fusion materials such as 27Al, 51V, 52Cr, 55Mn and 56Fe have been investigated. The new calculations on the excitation functions of 27 Al(n,p) 27 Mg, 51 V(n,p) 51 Ti, 52 Cr(n,p) 52 V, 55 Mn(n,p) 55 Cr and 56 Fe(n,p) 56 Mn reactions have been carried out up to 30 MeV incident neutron energy. Statistical model calculations, based on the Hauser-Feshbach formalism, have been carried out using the TALYS-1.0 and were compared with available experimental data in the literature and with ENDF/B-VII, T=300k; JENDL-3.3, T=300k and JEFF3.1, T=300k evaluated libraries .

Siddik, Tarik

2013-01-01T23:59:59.000Z

77

Fusion cross sections for reactions involving medium & heavy nucleus-nucleus systems  

E-Print Network (OSTI)

Existing data on near-barrier fusion excitation functions of medium and heavy nucleus-nucleus systems have been analyzed using a simple diffused barrier formula derived assuming the Gaussian shape of the barrier height distributions. Fusion cross section is obtained by folding the Gaussian barrier distribution with the classical expression for the fusion cross section for a fixed barrier. The energy dependence of the fusion cross section, thus obtained, provides good description to the existing data on near-barrier fusion and capture excitation functions for medium and heavy nucleus-nucleus systems. The fusion or capture cross section predictions are especially important for planning experiments for synthesizing new super-heavy elements.

Atta, Debasis

2014-01-01T23:59:59.000Z

78

Fusion cross sections for reactions involving medium & heavy nucleus-nucleus systems  

E-Print Network (OSTI)

Existing data on near-barrier fusion excitation functions of medium and heavy nucleus-nucleus systems have been analyzed using a simple diffused barrier formula derived assuming the Gaussian shape of the barrier height distributions. Fusion cross section is obtained by folding the Gaussian barrier distribution with the classical expression for the fusion cross section for a fixed barrier. The energy dependence of the fusion cross section, thus obtained, provides good description to the existing data on near-barrier fusion and capture excitation functions for medium and heavy nucleus-nucleus systems. The fusion or capture cross section predictions are especially important for planning experiments for synthesizing new super-heavy elements.

Debasis Atta; D. N. Basu

2014-02-20T23:59:59.000Z

79

Muon Catalyzed Fusion and Basic Muon Reactions in Deuterium and Hydrogen  

Science Journals Connector (OSTI)

By now, the kinetics of muon catalyzed fusion in pure D 2...and in H-D mixtures is understood in terms of the basic underlying processes. It provides rich information about muon induced few-body r...

Peter Kammel

1993-01-01T23:59:59.000Z

80

Odd-Z Transactinide Compound Nucleus Reactions Including the Discovery of 260Bh  

E-Print Network (OSTI)

reactions: hot fusion and cold fusion. The main differencenot yet well understood. Cold fusion reactions are, as theof nuclides. An advantage that cold fusion reactions have is

Nelson, Sarah L

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

FUSION03, Concluding Remarks  

Science Journals Connector (OSTI)

......studies of subbarrier fusion of light nuclei are needed as input into the calculation of dynamics and evolution of various...in this conference. 7. Fusion in astrophysical settings Nuclear fusion reactions play a very important role in astrophysical settings......

A. B. Balantekin

2004-02-01T23:59:59.000Z

82

The nuclear fusion for the reactions2H(d, n)3He,2H(d, p)3H,3H(d, n)4He  

Science Journals Connector (OSTI)

In the present paper the elastic model for the subbarrier fusion is applied to the reactions2H(d, n)3He,2H(d, p)3H,3H(d, n)4He. A comparison between the values of the reaction rates obtained in the framework of t...

A. Scalia

1989-05-01T23:59:59.000Z

83

Fusion Research Moves Ahead  

Science Journals Connector (OSTI)

Fusion Research Moves Ahead ... U.S. SCIENTISTS are steadily pecking away at the problems of controlled thermonuclear reactions. ...

1959-12-07T23:59:59.000Z

84

Neutron production from 7Li(d,xn) nuclear fusion reactions driven by high-intensity laser–target interactions  

Science Journals Connector (OSTI)

Numerical simulations of neutron production from deuterium–lithium nuclear fusion reactions have been performed. A set of differential cross sections for the 7Li(d,xn) reaction for incident deuteron energies of up to 50?MeV is assembled. The angular distribution of neutrons from a thick lithium target is simulated and benchmarked against experimental data. Two-stage neutron production from laser–target experiments has been studied as a function of laser intensity and energy. During the first stage a well collimated deuteron beam is generated using a high-intensity ultrashort pulse laser. During the second stage it is transported through a lithium target using a 3D Monte-Carlo ion beam–target deposition model. The neutron yield is estimated to be ~108?neutrons?J?1 laser energy. Some 1010 neutrons can be expected from a ~100?J petawatt-class laser. For incident deuteron energies above 1?MeV the proposed scheme for neutron production from d–Li reactions is superior to that from d–d reactions, producing a collimated beam of neutrons with higher neutron yield.

J Davis; G M Petrov; Tz Petrova; L Willingale; A Maksimchuk; K Krushelnick

2010-01-01T23:59:59.000Z

85

Extended Optical Model Analyses of Elastic Scattering, Direct Reaction, and Fusion Cross Sections for the 9Be + 208Pb System at Near-Coulomb-Barrier Energies  

E-Print Network (OSTI)

Based on the extended optical model approach in which the polarization potential is decomposed into direct reaction (DR) and fusion parts, simultaneous $\\chi^{2}$ analyses are performed for elastic scattering, DR, and fusion cross section data for the $^{9}$Be+$^{208}$Pb system at near-Coulomb-barrier energies. Similar $\\chi^{2}$ analyses are also performed by only taking into account the elastic scattering and fusion data as was previously done by the present authors, and the results are compared with those of the full analysis including the DR cross section data as well. We find that the analyses using only elastic scattering and fusion data can produce very consistent and reliable predictions of cross sections particularly when the DR cross section data are not complete. Discussions are also given on the results obtained from similar analyses made earlier for the $^{9}$Be+$^{209}$Bi system.

W. Y. So; S. W. Hong; B. T. Kim; T. Udagawa

2005-09-27T23:59:59.000Z

86

Sensitivity of fusion and quasi-elastic barrier distributions of {sub 16}O+{sub 144}Sm reaction on the coupling radius parameter  

SciTech Connect

We study the heavy-ion collision at sub-barrier energies of {sub 16}O+{sub 144}Sm system using full order coupled-channels formalism. We especially investigate the sensitivity of fusion and quasi-elastic barrier distributions for this system on the coupling radius parameter. We found that the coupled-channels calculations of the fusion and the quasi-elastic barrier distributions are sensitive to the coupling radius for this reaction in contrast to the fusion and quasi-elastic cross section. Our study indicates that the larger coupling radius, i.e., r{sub coup}=1.20, is required by the experimental quasi-elastic barrier distribution. However, the experimental fusion barrier distribution compulsory the small value, i.e., r{sub coup}=1.06.

Zamrun, Muhammad; Usman, Ida; Variani, Viska Inda [Department of Physics, Haluoleo University, Kendari, Sulawesi Tengagra, 93232 (Indonesia); Kassim, Hasan Abu [Department of Physics, University of Malaya, 50603 Kuala Lumpur (Malaysia)

2014-03-05T23:59:59.000Z

87

Probing the Structure of {sup 74}Ge Nucleus with Coupled-channels Analysis of {sup 74}Ge+{sup 74}Ge Fusion Reaction  

SciTech Connect

We study the fusion reaction of the {sup 74}Ge+{sup 74}Ge system in term of the full order coupled-channels formalism. We especially calculated the fusion cross section as well as the fusion barrier distribution of this reaction using transition matrix suggested by recent Coulomb excitation experiment. We compare the results with the one obtained by coupling matrix based on pure vibrational and rotational models. The present coupled-channels calculations for the barrier distributions obtained using experiment coupling matrix is in good agreement with the one obtained with vibrational model, in contrast to the rotational model. This is indicates that {sup 74}Ge nucleus favor a spherical shape than a deformed shape in its ground state. Our results will resolve the debates concerning the structure of this nucleus.

Zamrun F, Muhammad [Deparment of Physics University of Malaya, Kuala Lumpur, 50603 (Malaysia); Jurusan Fisika FMIPA, Universitas Haluoleo, Kendari, Sulawesi Tenggara, 93232 (Indonesia); Kasim, Hasan Abu [Deparment of Physics University of Malaya, Kuala Lumpur, 50603 (Malaysia)

2010-12-23T23:59:59.000Z

88

Lithium and nuclear fusion  

Science Journals Connector (OSTI)

... the EEC of a decision on the siting of the Joint European Torus (JET) nuclear fusion project, worrying setbacks though these are for European fusion research, should not be allowed ... gain is the highest (about 1,800 per fusion reaction). The first generation of nuclear fusion reactors will therefore need a continuous supply of both deuterium and tritium fuel.

Nick Walton, Ed Spooner

1976-06-17T23:59:59.000Z

89

Thermal properties of light nuclei from 12 fusion-evaporation reactions2  

E-Print Network (OSTI)

applications of nuclear44 physics, from nucleosynthesis calculations to reactor science. Its direct measurement of two, a comparison to a dedicated Hauser-Feshbach calculation allows to24 select a set of dissipative from direct reactions and/or -clustering32 effects. These channels are studied in further details

Paris-Sud XI, Université de

90

Comment on “Observation of neutronless fusion reactions in picosecond laser plasmas”  

Science Journals Connector (OSTI)

The paper by Belyaev et al. [Phys. Rev. E 72, 026406 (2005)] reported the first experimental observation of alpha particles produced in the thermonuclear reaction B11(p,?)B8e induced by laser irradiation on a B11 polyethylene (CH2) composite target. The laser used in the experiment is characterized by a picosecond pulse duration and a peak of intensity of 2×1018?W/cm2. We suggest that both the background-reduction method adopted in their detection system and the choice of the detection energy region of the reaction products are possibly inadequate. Consequently the total yield reported underestimates the true yield. Based on their observation, we give an estimation of the total yield to be higher than their conclusion, i.e., of the order of 105? per shot.

S. Kimura; A. Anzalone; A. Bonasera

2009-03-26T23:59:59.000Z

91

Enhancement of the Deuteron-Fusion Reactions in Metals and its Experimental Implications  

E-Print Network (OSTI)

Recent measurements of the reaction d(d,p)t in metallic environments at very low energies performed by different experimental groups point to an enhanced electron screening effect. However, the resulting screening energies differ strongly for divers host metals and different experiments. Here, we present new experimental results and investigations of interfering processes in the irradiated targets. These measurements inside metals set special challenges and pitfalls which make them and the data analysis particularly error-prone. There are multi-parameter collateral effects which are crucial for the correct interpretation of the observed experimental yields. They mainly originate from target surface contaminations due to residual gases in the vacuum as well as from inhomogeneities and instabilities in the deuteron density distribution in the targets. In order to address these problems an improved differential analysis method beyond the standard procedures has been implemented. Profound scrutiny of the other experiments demonstrates that the observed unusual changes in the reaction yields are mainly due to deuteron density dynamics simulating the alleged screening energy values. The experimental results are compared with different theoretical models of the electron screening in metals. The Debye-H\\"{u}ckel model that has been previously proposed to explain the influence of the electron screening on both nuclear reactions and radioactive decays could be clearly excluded.

A. Huke; K. Czerski; P. Heide; G. Ruprecht; N. Targosz; W. ?ebrowski

2008-05-29T23:59:59.000Z

92

Fusion News: 2002  

Science Journals Connector (OSTI)

This paper summarizes key news events in the development of fusion energy. Highlights include status of ITER negotiations, FESAC studies, NIF construction and fusion-related legislation. Also included are summ...

Stephen O. Dean

2003-03-01T23:59:59.000Z

93

Entrance Channel Dynamics of Hot and Cold Fusion Reactions Leading to Superheavy Elements  

E-Print Network (OSTI)

We investigate the entrance channel dynamics for the reactions $\\mathrm{^{70}Zn}+\\mathrm{^{208}Pb}$ and $\\mathrm{^{48}Ca}+\\mathrm{^{238}U}$ using the fully microscopic time-dependent Hartree-Fock (TDHF) theory coupled with a density constraint. We calculate excitation energies and capture cross-sections relevant for the study of superheavy formations. We discuss the deformation dependence of the ion-ion potential for the $\\mathrm{^{48}Ca}+\\mathrm{^{238}U}$ system and perform an alignment angle averaging for the calculation of the capture cross-section. The results show that this parameter-free approach can generate results in good agreement with experiment and other theories.

A. S. Umar; V. E. Oberacker; J. A. Maruhn; P. -G. Reinhard

2010-04-15T23:59:59.000Z

94

Entrance Channel Dynamics of Hot and Cold Fusion Reactions Leading to Superheavy Elements  

E-Print Network (OSTI)

We investigate the entrance channel dynamics for the reactions $\\mathrm{^{70}Zn}+\\mathrm{^{208}Pb}$ and $\\mathrm{^{48}Ca}+\\mathrm{^{238}U}$ using the fully microscopic time-dependent Hartree-Fock (TDHF) theory coupled with a density constraint. We calculate excitation energies and capture cross-sections relevant for the study of superheavy formations. We discuss the deformation dependence of the ion-ion potential for the $\\mathrm{^{48}Ca}+\\mathrm{^{238}U}$ system and perform an alignment angle averaging for the calculation of the capture cross-section. The results show that this parameter-free approach can generate results in good agreement with experiment and other theories.

Umar, A S; Maruhn, J A; Reinhard, P -G

2010-01-01T23:59:59.000Z

95

Chapter 7 - Fusion  

Science Journals Connector (OSTI)

Abstract This chapter briefly introduces the topic of fusing light nuclei such as deuterium (D) and tritium (T) together to release binding energy. Characteristics of a plasma in which thermonuclear fusion is carried out are described. Fusion reaction cross sections are graphed for the most promising reactions including D-D and D-T. The ignition temperature for fusion is shown as the cross over point between energy produced by fusion and radiation losses due to mechanisms such as bremsstrahlung.

Raymond L. Murray; Keith E. Holbert

2015-01-01T23:59:59.000Z

96

Semi-classical Characters and Optical Model Description of Heavy Ion Scattering, Direct Reactions, and Fusion at Near-barrier Energies  

E-Print Network (OSTI)

An approach is proposed to calculate the direct reaction (DR) and fusion probabilities for heavy ion collisions at near-Coulomb-barrier energies as functions of the distance of closest approach D within the framework of the optical model that introduces two types of imaginary potentials, DR and fusion. The probabilities are calculated by using partial DR and fusion cross sections, together with the classical relations associated with the Coulomb trajectory. Such an approach makes it possible to analyze the data for angular distributions of the inclusive DR cross section, facilitating the determination of the radius parameters of the imaginary DR potential in a less ambiguous manner. Simultaneous $\\chi^{2}$-analyses are performed of relevant data for the $^{16}$O+$^{208}$Pb system near the Coulomb-barrier energy.

B. T. Kim; W. Y. So; S. W. Hong; T. Udagawa

2001-11-02T23:59:59.000Z

97

Neutron imaging with bubble chambers for inertial confinement fusion.  

E-Print Network (OSTI)

??One of the main methods to obtain energy from controlled thermonuclear fusion is inertial confinement fusion (ICF), a process where nuclear fusion reactions are initiated… (more)

Ghilea, Marian Constantin (1973 - ); Meyerhofer, David D.

2011-01-01T23:59:59.000Z

98

New Routes to Fusion Power?  

Science Journals Connector (OSTI)

New Routes to Fusion Power? ... THE VEIL OF SECRECY around U. S. research on controlled thermonuclear reactions has lifted slightly. ...

1958-05-19T23:59:59.000Z

99

Fusion-energy reaction 3H(d,?)n at low energies  

Science Journals Connector (OSTI)

We have extended our past measurements of the H2(t,?)n reaction near the low-energy (3/2)+ resonance by measuring eight more data points over the lab deuteron energy range 80–116 keV. This was accomplished by bombarding a tritium gas target with deuterons, in contrast to the previous measurements in which a deuterium gas target was bombarded with tritons. The present data are accurate to 1.6%. The results of including the present data in a simple two-channel, two-level, R-matrix analysis and also in a large three-channel, multilevel, R-matrix analysis are presented. The resonance is characterized by giving the S-matrix poles from the R-matrix analyses. Of interest is the discovery that both analyses give two resonance poles on different (unphysical) Riemann sheets, one of them being a so-called ‘‘shadow pole.’’ This is the first experimental observation of a shadow pole in nuclear and particle physics. Maxwellian reactivities up to a plasma temperature of 20 keV are presented.

Ronald E. Brown; Nelson Jarmie; G. M. Hale

1987-06-01T23:59:59.000Z

100

Dynamics of Fusion in Plasmas  

Science Journals Connector (OSTI)

......gaining energy from nuclear fusion reactions using different...energy is by means of nuclear fusion reactions. Such reactions...from time to time some nuclear fusion occurs and energy is...more energy output than input, the and/or must......

A. Bonasera

2004-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Laser Fusion: The Uncertain Road to Ignition  

Science Journals Connector (OSTI)

In early 2014, the U.S. National Ignition Facility announced that it had achieved a fusion reaction that produced net positive energy. Fusion scientists have applauded that...

Rose, Melinda

2014-01-01T23:59:59.000Z

102

Lightest Isotope of Bh Produced Via the 209Bi(52Cr,n)260Bh Reaction  

E-Print Network (OSTI)

models. For many years, “cold fusionreactions utilizingproduced via the new “cold fusionreaction 209 Bi( 52 Cr,

2007-01-01T23:59:59.000Z

103

Edge effects caused by enhancement of DD/DT fusion reactions in metals at low energy of projectile particles in an ITER-type fusion reactor  

Science Journals Connector (OSTI)

Experimental data on enhancement of the yield of DD/DT reactions in metal targets at low energies of projectile deuterons (E d...< 5 keV) were analyzed. A semiempirical expression was obtained to ...

A. G. Lipson; A. S. Roussetski; B. F. Lyakhov; E. I. Saunin…

2008-07-01T23:59:59.000Z

104

New Nuclear Reaction  

Science Journals Connector (OSTI)

Thermonuclear-like reaction points to possibilities for better kind of nuclear energy ... FISSION can make a chain reaction take place, as can fusion. ... To these two, scientists at University of California Radiation Laboratory have added a third: a "catalyzed nuclear reaction," a reaction that yields energy and is akin to fusion (thermonuclear) reactions. ...

1957-01-14T23:59:59.000Z

105

FUSION POWER Tokamak Test a Big Success  

Science Journals Connector (OSTI)

FUSION POWER Tokamak Test a Big Success ... Successful plasma production in the tokamak fusion test reactor at Princeton University's Plasma Physics Laboratory has set the stage for possible sustained fusion reactions in the device by 1990. ...

1983-01-10T23:59:59.000Z

106

05/22/2006 12:33 PMnews @ nature.com -Chaos could keep fusion under control -A leaky magnetic bottle may prove key to making a reactor. Page 1 of 3http://www.nature.com/news/2006/060522/full/060522-2.html  

E-Print Network (OSTI)

Careers Drug discovery Earth and environment Medical Research Physical Sciences NEWS Published online: 22) achieve its goal of generating net energy from fusion. Fusion occurs when two light elements, usually to briefly light one million 100 W lightbulbs, corroding key reactor parts. Pressure release Until now

107

Fusion barriers for heavy-ion systems  

Science Journals Connector (OSTI)

Analytical expressions for the fusion barrier height and radius have been derived from a four-parameter empirical fusion cross section formula for heavy ions. The fusion barrier parameters calculated, using these expressions, are in good agreement with the literature values.NUCLEAR REACTIONS Fusion cross section excitation functions, fusion barrier parameters.

S. K. Gupta and S. Kailas

1982-08-01T23:59:59.000Z

108

Ph.D. Theses 1. M. Dasgupta Study of cross section and average angular momenta in fusion reactions of 28  

E-Print Network (OSTI)

-fission reactions (BARC, 1994) 7. S. Chattopadhyay Investigation of nuclear structure at high spins in mass-80) 12. A.K. Pandey Studies on the fission properties of low Z elements by solid state nuclear track in 32 to 55 MeV excitation energy region on 28 Si (BARC, 1995) 14. B.J. Roy Reaction Mechanism in heavy

Shyamasundar, R.K.

109

X-ray bang-time and fusion reaction history at picosecond resolution using RadOptic detection  

SciTech Connect

We report recent progress in the development of RadOptic detectors, radiation to optical converters, that rely upon x-ray absorption induced modulation of the optical refractive index of a semiconductor sensor medium to amplitude modulate an optical probe beam. The sensor temporal response is determined by the dynamics of the electron-hole pair creation and subsequent relaxation in the sensor medium. Response times of a few ps have been demonstrated in a series of experiments conducted at the LLNL Jupiter Laser Facility (JLF). This technology will enable x-ray bang-time and fusion burn-history measurements with {approx} ps resolution.

Vernon, S. P.; Lowry, M. E.; Baker, K. L.; Bennett, C. V.; Celeste, J. R.; Cerjan, C.; Haynes, S.; Hernandez, V. J.; Hsing, W. W.; LaCaille, G. A.; London, R. A.; Moran, B.; Schach von Wittenau, A.; Steele, P. T.; Stewart, R. E. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808 (United States)

2012-10-15T23:59:59.000Z

110

X-ray bang-time and fusion reaction history at picosecond resolution using RadOptic detectiona)  

Science Journals Connector (OSTI)

We report recent progress in the development of RadOptic detectors radiation to optical converters that rely upon x-ray absorption induced modulation of the optical refractive index of a semiconductorsensor medium to amplitude modulate an optical probe beam. The sensor temporal response is determined by the dynamics of the electron-hole pair creation and subsequent relaxation in the sensor medium. Response times of a few ps have been demonstrated in a series of experiments conducted at the LLNL Jupiter Laser Facility (JLF). This technology will enable x-ray bang-time and fusion burn-history measurements with ? ps resolution.

S. P. Vernon; M. E. Lowry; K. L. Baker; C. V. Bennett; J. R. Celeste; C. Cerjan; S. Haynes; V. J. Hernandez; W. W. Hsing; G. A. LaCaille; R. A. London; B. Moran; A. Schach von Wittenau; P. T. Steele; R. E. Stewart

2012-01-01T23:59:59.000Z

111

X-ray bang-time and fusion reaction history at ~ps resolution using RadOptic detection  

SciTech Connect

We report recent progress in the development of RadOptic detectors, radiation to optical converters, that rely upon x-ray absorption induced modulation of the optical refractive index of a semiconductor sensor medium to amplitude modulate an optical probe beam. The sensor temporal response is determined by the dynamics of the electron-hole pair creation and subsequent relaxation in the sensor medium. Response times of a few ps have been demonstrated in a series of experiments conducted at the LLNL Jupiter Laser Facility. This technology will enable x-ray bang-time and fusion burn-history measurements with {approx} ps resolution.

Vernon, S P; Lowry, M E; Baker, K L; Bennett, C V; Celeste, J R; Cerjan, C; Haynes, S; Hernandez, V J; Hsing, W W; London, R A; Moran, B; von Wittenau, A S; Steele, P T; Stewart, R E

2012-05-01T23:59:59.000Z

112

Non-statistical decay and $?$-correlations in the $^{12}$C+$^{12}$C fusion-evaporation reaction at 95 MeV  

E-Print Network (OSTI)

Multiple alpha coincidence and correlations are studied in the reaction $^{12}$C+$^{12}$C at 95 MeV for fusion-evaporation events completely detected in charge. Two specific channels with Carbon and Oxygen residues in coincidence with $\\alpha$-particles are addressed, which are associated with anomalously high branching ratios with respect the predictions by Hauser-Feshbach calculations. Triple alpha emission appears kinematically compatible with a sequential emission from a highly excited Mg. The phase space distribution of $\\alpha$-$\\alpha$ coincidences suggests a correlated emission from a Mg compound, leaving an Oxygen residue excited above the threshold for neutron decay. These observations indicate a preferential $\\alpha$ emission of $^{24}$Mg at excitation energies well above the threshold for $6-\\alpha$ decay.

L. Morelli; G. Baiocco; M. D'Agostino; F. Gulminelli; M. Bruno; U. Abbondanno; S. Appannababu; S. Barlini; M. Bini; G. Casini; M. Cinausero; M. Degerlier; D. Fabris; N. Gelli; F. Gramegna; V. L. Kravchuk; T. Marchi; G. Pasquali; S. Piantelli; S. Valdré; Ad R. Raduta

2014-04-14T23:59:59.000Z

113

Focus on Fusion...  

Science Journals Connector (OSTI)

Focus on Fusion... ... As 1957 ended, the British press set off a thermonuclear uproar, blasted the U. S. Atomic Energy Commission for assertedly withholding information on British breakthroughs in controlled thermonuclear reactions. ... However, last year did see a breakthrough of sorts as thermonuclear information managed to clear the secrecy hurdle at last; by fall, fusion research was completely declassified. ...

1959-01-05T23:59:59.000Z

114

Fusion of Polarized Deuterons  

Science Journals Connector (OSTI)

The nuclear physics aspects of the d-d reactions initiated by low-energy polarized deuterons are discussed. It is shown that the use of polarized deuterons does not suppress the fusion of deuterons with deuterons and hence does not suppress neutron production. Therefore a recently proposed "neutron-free" d-He3 fusion reactor is unlikely to work.

H. M. Hofmann and D. Fick

1984-06-04T23:59:59.000Z

115

Properties of resonant states in 18Ne relevant to key 14O(alpha,p)17F breakout reaction in type I x-ray bursts  

E-Print Network (OSTI)

The $^{14}$O($\\alpha$,$p$)$^{17}$F reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type I x-ray bursts. The resonant properties in the compound nucleus $^{18}$Ne have been investigated through resonant elastic scattering of $^{17}$F+$p$. The radioactive $^{17}$F beam was separated by the CNS Radioactive Ion Beam separator (CRIB) and bombarded a thick H$_2$ gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by using three ${\\Delta}$E-E silicon telescopes at laboratory angles of $\\theta$$_{lab}$$\\approx$3$^\\circ$, 10$^\\circ$ and 18$^\\circ$, respectively. Five resonances at $E_{x}$=6.15, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions. Based on an $R$-matrix analysis, $J^{\\pi}$=1$^-$ was firmly assigned to the 6.15-MeV state. This state dominates the thermonuclear $^{14}$O($\\alpha$,$p$)$^{17}$F rate below 1 GK. We have also confirmed the existence and spin-parities of three states between 6.1 and 6.4 MeV. A...

Hu, J; Parikh, A; Xu, S W; Yamaguchi, H; Kahl, D; Ma, P; Su, J; Wang, H W; Nakao, T; Wakabayashi, Y; Teranishi, T; Hahn, K I; Moon, J Y; Sung, H S; Hashimoto, T; Chen, A A; Irvine, D; Lee, C S; Kubono, S

2014-01-01T23:59:59.000Z

116

Fusion and Ignition  

NLE Websites -- All DOE Office Websites (Extended Search)

that found in the cores of the sun and stars. One of NIF's goals is to create a self-sustaining nuclear fusion reaction, in which the nuclei of two forms of hydrogen fuse...

117

Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm+48Ca fusion reactions  

SciTech Connect

The decay properties of {sup 290}116 and {sup 291}116, and the dependence of their production cross sections on the excitation energies of the compound nucleus, {sup 293}116, have been measured in the {sup 245}Cm({sup 48}Ca,xn){sup 293-x}116 reaction. These isotopes of element 116 are the decay daughters of element 118 isotopes, which are produced via the {sup 249}Cf+{sup 48}Ca reaction. They performed the element 118 experiment at two projectile energies, corresponding to {sup 297}118 compound nucleus excitation energies of E* = 29.2 {+-} 2.5 and 34.4 {+-} 2.3 MeV. During an irradiation with a total beam dose of 4.1 x 10{sup 19} {sup 48}Ca projectiles, three similar decay chains consisting of two or three consecutive {alpha} decays and terminated by a spontaneous fission (SF) with high total kinetic energy of about 230 MeV were observed. The three decay chains originated from the even-even isotope {sup 294}118 (E{sub {alpha}} = 11.65 {+-} 0.06 MeV, T{sub {alpha}} = 0.89{sub -0.31}{sup +1.07} ms) produced in the 3n-evaporation channel of the {sup 249}Cf+{sup 48}Ca reaction with a maximum cross section of 0.5{sub -0.3}{sup +1.6} pb.

Oganessian, Y T; Utyonkov, V K; Lobanov, Y V; Abdullin, F S; Polyakov, A N; Sagaidak, R N; Shirokovsky, I V; Tsyganov, Y S; Voinov, A A; Gulbekian, G G; Bogomolov, S L; Gikal, B N; Mezentsev, A N; Iliev, S; Subbotin, V G; Sukhov, A M; Subotic, K; Zagrebaev, V I; Vostokin, G K; Itkis, M G; Moody, K J; . Patin, J B; Shaughnessy, D A; Stoyer, M A; Stoyer, N J; Wilk, P A; Kenneally, J M; Landrum, J H; Wild, J F; Lougheed, R W

2006-01-31T23:59:59.000Z

118

Dynamics of Fusion in Plasmas  

Science Journals Connector (OSTI)

......especially when coupled to an accelerator, in the second case...gaining energy from nuclear fusion reactions using...especially when coupled to an accelerator, in the second case...energy is by means of nuclear fusion reactions. Such...section is measured in vacuum, but it might be modified......

A. Bonasera

2004-02-01T23:59:59.000Z

119

Inertial fusion energy studies in the UK  

E-Print Network (OSTI)

#12;The types of research - Fusion ·Absorption and partition of laser energy ­ effects of laserInertial fusion energy studies in the UK Dr Kate Lancaster #12;Inertial Confinement Fusion #12 burns because the alpha particles produced deposit more energy and make more fusion reactions happen

120

The development of structural materials for fusion reactors  

Science Journals Connector (OSTI)

...severely exposed parts of future fusion reactors and pose key problems...successful implementation of fusion reactors as an efficient source...conditions in the International Thermonuclear Experimental Reactor (ITER...environmental attractiveness of fusion reactors. In this paper...

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

THE DYNAMICS OF THE FUSION OF TWO NUCLEI  

E-Print Network (OSTI)

Olmi, D. Schwalm, and W. Wolfli, Fusion Reaction Studies ofFactor in Initiating Fusion between Very Heavy Ions", GSI-Alexander and G.R. Satchler, "Fusion Barriers, Empirical and

Swiatecki, W.J.

2014-01-01T23:59:59.000Z

122

FUSION CROSS-SECTIONS AND THE NEW DYNAMICS  

E-Print Network (OSTI)

Olmi, 0. Schwalm and W. Wb'lfli, "Fusion Reaction Studies ofin I n i t i a t i n g Fusion between Very High Ions", GSI-Alexander and G.R. Satchler, "Fusion Barriers, Empirical and

Swiatecki, W.J.

2010-01-01T23:59:59.000Z

123

PLASMA-PHYSICS-21 Heavy ion driven reactor-size double shell inertial fusion targets*  

E-Print Network (OSTI)

Inertial Confinement Fusion (ICF) is considered as an alternative to Magnetic Confinement Fusion to achieve controlled thermonuclear fusion. The main goal is to exploit the energy released from thermonuclear fusion reactions

M. C. Serna Moreno; N. A. Tahir; J. J. López Cela; A. R. Piriz; D. H. H. Hoffmann

124

Fusion Reactor Plasmas with Polarized Nuclei  

Science Journals Connector (OSTI)

Nuclear fusion rates can be enhanced or suppressed by polarization of the reacting nuclei. In a magnetic fusion reactor, the depolarization time is estimated to be longer than the reaction time.

R. M. Kulsrud; H. P. Furth; E. J. Valeo; M. Goldhaber

1982-10-25T23:59:59.000Z

125

Observation of the 3n Evaporation Channel in the Complete Hot-Fusion Reaction {sup 26}Mg+{sup 248}Cm Leading to the New Superheavy Nuclide {sup 271}Hs  

SciTech Connect

The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6{<=}Z{<=}18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction {sup 248}Cm({sup 26}Mg,xn){sup 274-x}Hs and the observation of the new nuclide {sup 271}Hs produced in the 3n evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4n and 5n channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.

Dvorak, J.; Dvorakova, Z.; Kruecken, R.; Nebel, F.; Perego, R.; Schuber, R.; Tuerler, A.; Wierczinski, B.; Yakushev, A. [Technische Universitaet Muenchen, D-85748 Garching (Germany); Bruechle, W.; Jaeger, E.; Schaedel, M.; Schausten, B.; Schimpf, E. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Chelnokov, M.; Kuznetsov, A.; Yeremin, A. [Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Duellmann, Ch. E. [Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); University of California, Berkeley, California 94720-1460 (United States); Eberhardt, K. [Universitaet Mainz, D-55128 Mainz (Germany); Nagame, Y. [Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)] (and others)

2008-04-04T23:59:59.000Z

126

Splenogonadal Fusion  

Science Journals Connector (OSTI)

Splenogonadal fusion is a very rare congenital malformation. It is characterized by fusion of the spleen and gonad. The first case of splenogonadal fusion was described by Bostroem in 1883. There are two types: c...

Ahmed H. Al-Salem

2014-01-01T23:59:59.000Z

127

Type Fusion  

Science Journals Connector (OSTI)

Fusion is an indispensable tool in the arsenal ... Less well-known, but equally valuable is type fusion, which states conditions for fusing an application ... algebra. We provide a novel proof of type fusion base...

Ralf Hinze

2011-01-01T23:59:59.000Z

128

Fusion excitation function revisited  

E-Print Network (OSTI)

We report on a comprehensive systematics of fusion-evaporation and/or fusion-fission cross sections for a very large variety of systems over an energy range 4-155 A.MeV. Scaled by the reaction cross sections, fusion cross sections do not show a universal behavior valid for all systems although a high degree of correlation is present when data are ordered by the system mass asymmetry.For the rather light and close to mass-symmetric systems the main characteristics of the complete and incomplete fusion excitation functions can be precisely determined. Despite an evident lack of data above 15A.MeV for all heavy systems the available data suggests that geometrical effects could explain the persistence of incomplete fusion at incident energies as high as 155A.MeV.

Ph. Eudes; Z. Basrak; F. Sébille; V. de la Mota; G. Royer; M. Zori?

2012-09-07T23:59:59.000Z

129

Cold nuclear fusion  

SciTech Connect

Recent accelerator experiments on fusion of various elements have clearly demonstrated that the effective cross-sections of these reactions depend on what material the target particle is placed in. In these experiments, there was a significant increase in the probability of interaction when target nuclei are imbedded in a conducting crystal or are a part of it. These experiments open a new perspective on the problem of so-called cold nuclear fusion.

Tsyganov, E. N., E-mail: edward.tsyganov@utsouthwestern.edu [University of Texas Southwestern Medical Center at Dallas (United States)

2012-02-15T23:59:59.000Z

130

Investigations of nuclear structure and nuclear reactions induced by complex projectiles  

SciTech Connect

This report discusses research in the following areas: nuclear structure; fusion reactions near and below the barrier; incomplete fusion and fragmentation reactions; and instrumentation and analysis. (LSP).

Sarantites, D.G.

1990-01-01T23:59:59.000Z

131

Chapter 17 - Nuclear Fusion  

Science Journals Connector (OSTI)

Publisher Summary Nuclear fusion, the joining of light nuclei of hydrogen into heavier nuclei of helium, has potential environmental, safety and proliferation characteristics as an energy source, as well as adequate fuel to power civilization for times long compared to human history. It is, however, more challenging to convert to an energy source than nuclear fission. This chapter introduces the physics, advantages, difficulties, progress, economics and prospects for fusion energy power plants. Nuclear fusion is the process, in which light nuclei can release large amounts of energy if they combine, or fuse, into heavier nuclei. The principal nuclear reactions which have been considered for reactor concepts involve reactions of isotopes of the two lightest elements: hydrogen and helium. The fuel costs for fusion reactors will be negligible in comparison with the value of the electricity produced. It is difficult to precisely assess the cost of fusion-generated electricity until there is experience with an operating power plant, since the cost will be dependent upon the reliability and the frequency and expense of maintenance, both of which are likely to improve with the hindsight of experience. A fusion reactor does not directly emit CO2 or other greenhouse gases, or any combustion products that contribute to acid rain, and the indirect emissions due to factors like fuel gathering and transport, plant construction and maintenance, and activated parts storage would be small. Thus, fusion power would not have appreciable adverse effects upon global warming, atmospheric quality or acidification of the oceans, lakes and streams.

Larry R. Grisham

2008-01-01T23:59:59.000Z

132

Score Fusion and Decision Fusion  

Science Journals Connector (OSTI)

Score fusion is a paradigm, which calculates similarity scores ... then combines the two scores according to a fusion formula, e.g., the overall score ... mean of the two modality scores. Decision fusion is a par...

2009-01-01T23:59:59.000Z

133

INSTITUTE OF PHYSICS PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 42 (2002) 13511356 PII: S0029-5515(02)54166-1  

E-Print Network (OSTI)

INSTITUTE OF PHYSICS PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion input of converging driver beams. Requirements and key issues related to target injection and tracking

Najmabadi, Farrokh

134

Fusion Power Still a Long Way Off  

Science Journals Connector (OSTI)

Fusion Power Still a Long Way Off ... PRESS REPORTS of spectacular British breakthroughs in achieving controlled thermonuclear reactions have proved to be unfounded. ...

1958-02-03T23:59:59.000Z

135

Magnetically catalyzed fusion  

Science Journals Connector (OSTI)

We calculate the reaction cross sections for the fusion of hydrogen and deuterium in strong magnetic fields as are believed to exist in the atmospheres of neutron stars. We find that in the presence of a strong magnetic field (B?1012 G), the reaction rates are many orders of magnitude higher than in the unmagnetized case. The fusion of both protons and deuterons is important over a neutron star’s lifetime for ultrastrong magnetic fields (B?1016 G). The enhancement may have dramatic effects on thermonuclear runaways and bursts on the surfaces of neutron stars. © 1996 The American Physical Society.

Jeremy S. Heyl and Lars Hernquist

1996-11-01T23:59:59.000Z

136

US ITER - Why Fusion?  

NLE Websites -- All DOE Office Websites (Extended Search)

US Fusion Research Sites US Fusion Research Sites DOE Office of Science: US Fusion Energy Sciences Program Fusion Power Associates General Atomics DIIII-D National Fusion Facility...

137

Dynamic microscopic study of pre-equilibrium giant resonance excitation and fusion in the reactions $^{132}$Sn+$^{48}$Ca and $^{124}$Sn+$^{40}$Ca  

E-Print Network (OSTI)

We study pre-equilibrium giant dipole resonance excitation and fusion in the neutron-rich system $^{132}$Sn+$^{48}$Ca at energies near the Coulomb barrier, and we compare photon yields and total fusion cross sections to those of the stable system $^{124}$Sn+$^{40}$Ca. The dynamic microscopic calculations are carried out on a three-dimensional lattice using both the Time-Dependent Hartree-Fock method and the Density Constrained TDHF method. We demonstrate that the peak of the GDR excitation spectrum occurs at a substantially lower energy than expected for an equilibrated system, thus reflecting the very large prolate elongation of the dinuclear complex during the early stages of fusion. Our theoretical fusion cross-sections for both systems agree reasonably well with recent data measured at HRIBF.

V. E. Oberacker; A. S. Umar; J. A. Maruhn; P. -G. Reinhard

2012-01-25T23:59:59.000Z

138

Fusion Nuclear Science and Technology ProgramFusion Nuclear Science and Technology Program Issues and Strategy for Fusion Nuclear Science Facility (FNSF)  

E-Print Network (OSTI)

Need for Fusion Nuclear Science and Technology ProgramFusion Nuclear Science and Technology Program ­Issues and Strategy for Fusion Nuclear Science Facility (FNSF) ­Key R&D Areas to begin NOW (modeling 12, 2010 #12;Fusion Nuclear Science and Technology (FNST) FNST is the science engineering technology

Abdou, Mohamed

139

Electron Screening Effect on Stellar Thermonuclear Fusion  

E-Print Network (OSTI)

Key words Dense matter, stellar nucleosynthesis. We study the impact of plasma correlation effects on nonresonant thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars, and the interiors of white dwarfs, low-mass stars, and substellar objects. We examine in particular the effect of electron screening on the enhancement of thermonuclear reactions in dense plasmas within and beyond the linear mixing rule approximation as well as the corrections due to quantum effects at high density. In addition, we examine some recent unconventional theoretical results on stellar thermonuclear fusions and show that these scenarios do not apply to stellar conditions. c ? 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1

K. -h. Spatschek; M. Bonitz; T. Klinger; U. Ebert; C. Franck; A. V. Keudell; D. Naujoks; M. Dewitz; A. Y. Potekhin; G. Chabrier

2012-01-01T23:59:59.000Z

140

Laser-driven fusion  

Science Journals Connector (OSTI)

The use of intense laser light to bring about thermonuclear reactions in a plasma is of considerable current interest. We present detailed analytical and computational studies which show the feasibility of laser-driven fusion. The required laser technology and the presently anticipated practical difficulties are discussed in outline.

Keith A. Brueckner and Siebe Jorna

1974-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Nuclear Fusion  

Science Journals Connector (OSTI)

Although not yet developed at the commercial stage, nuclear fusion technology is still being considered as a ... used in nuclear warfare. Since research in nuclear fusion for the production of energy started abou...

Ricardo Guerrero-Lemus; José Manuel Martínez-Duart

2013-01-01T23:59:59.000Z

142

Fusion Energy  

Science Journals Connector (OSTI)

Nuclear fusion was discovered in 1932, which is earlier ... than 400 fission power plants are operated to provide base load of electricity worldwide now. In contrast, nuclear fusion was used for a hydrogen bomb i...

Prof. Hiroshi Yamada

2012-01-01T23:59:59.000Z

143

Fusion Inhibitors  

Science Journals Connector (OSTI)

(T-20, Fuzeon) was introduced as the first fusion inhibitor at the beginning of 2003. It works by blocking the cells' viral uptake. Disadvantages of fusion inhibitors are their production difficulties, high...

2008-01-01T23:59:59.000Z

144

2002 Fusion Summer Study Subgroup E4 -Development Pathway Subgroup  

E-Print Network (OSTI)

2002 Fusion Summer Study Subgroup E4 - Development Pathway Subgroup Draft by: Farrokh Najmabadi A burning plasma experiment is a key step in developing fusion. The realization of fusion, however, requires and fusion power technologies, etc. An important discriminator among various embodiments of burning plasma

Najmabadi, Farrokh

145

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

About Us About Us FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement Webby Honoree graphic graphic Key Resource Snap editors choice new scientist DrMatrix Webby Awards Honoree, April 10, 2007 The Alchemist - WebPick, January 29, 1999 Links2Go - Fusion, November 9, 1998 October 19, 1998 - October 19, 1999 Site of the Day, September 24, 1998. Hot spot. Student Science Resource, April 16, 1997

146

Some Calculations for Cold Fusion Superheavy Elements  

E-Print Network (OSTI)

The Q value and optimal exciting energy of the hypothetical superheavy nuclei in cold fusion reaction are calculated with relativistic mean field model and semiemperical shell model mass equation(SSME) and the validity of the two models is tested. The fusion barriers are also calculated with two different models and reasonable results are obtained. The calculations can give useful references for the experiments in the superheavy nuclei synthesized in cold fusion reactions.

Zhong, X H; Ning, P Z

2004-01-01T23:59:59.000Z

147

Some Calculations for Cold Fusion Superheavy Elements  

E-Print Network (OSTI)

The Q value and optimal exciting energy of the hypothetical superheavy nuclei in cold fusion reaction are calculated with relativistic mean field model and semiemperical shell model mass equation(SSME) and the validity of the two models is tested. The fusion barriers are also calculated with two different models and reasonable results are obtained. The calculations can give useful references for the experiments in the superheavy nuclei synthesized in cold fusion reactions.

X. H. Zhong; L. Li; P. Z. Ning

2004-10-18T23:59:59.000Z

148

Genetic fusion  

Science Journals Connector (OSTI)

Genetic fusion is introduced as a model for evolution. In the fusion two genomes are combined to generate a longer genome. Representing each species by a binary genetic sequence, we introduce a fitness function on the bit sequence. As the evolutionary dynamics, we incoroporate mutation, genetic fusion, and reproduction in proportion to fitness. It is found that genetic fusion leads to the appearance of module-type sequences and duplicated genes. The time necessary to find a sequence with large fitness is largely reduced by the inclusion of genetic fusion, which suggests the application of our algorithm to optimization problems.

Takashi Ikegami and Kunihiko Kaneko

1990-12-24T23:59:59.000Z

149

I. Nuclear Production Reaction and Chemical Isolation Procedure for 240Am II. New Superheavy Element Isotopes: 242Pu(48Ca,5n)285-114  

E-Print Network (OSTI)

of superheavy nuclei in cold fusion reactions. Phys. Rev. C,transfermium elements in cold fusion reactions. Phys. Rev.have been deemed “cold fusionreactions because of the low

Ellison, Paul Andrew

2011-01-01T23:59:59.000Z

150

Nuclear Physics for Nuclear Fusion  

SciTech Connect

The nuclear fusion data for deuteron-triton resonance near 100 keV are found to be consistent with the selective resonant tunneling model. The feature of this selective resonant tunneling is the selectivity. It selects not only the energy level, but also the damping rate (nuclear reaction rate). When the Coulomb barrier is thin and low, the resonance selects the fast reaction channel; however, when the Coulomb barrier is thick and high, the resonance selects the slow reaction channel. This mechanism might open an approach toward fusion energy with no strong nuclear radiation.

Li Xingzhong [Tsinghua University (China)

2002-01-15T23:59:59.000Z

151

New cold nuclear fusion theory and experimental tests  

Science Journals Connector (OSTI)

A theory of neutron-induced tritium-deuterium fusion at room temperature is developed, based entirely on previously measured cross-sections of known nuclear reactions. The fusion process involves self-sustaini...

Yeong E. Kim

1990-12-01T23:59:59.000Z

152

Fusion Website  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion Basics Fusion Intro Fusion Education Research DIII-D Internal Site Opportunities Virtual DIII-D Collaborators Countries Physics Eng Physics Operations Diagnostics Computing IFT IFT Site ITER ITER Site FDF Theory Collaborators Conferences GA-Hosted Room Reservations Fusion Meetings Plasma Publications Presentations Images Brochures Posters Movies Corporate General Atomics Products Visitor GA Fusion Hotels Internal Users GA Internal Site DIII-D General Experimental Science Experimental Science Home 2013 Experimental Campaign Burning Plasma Physics Dynamics & Control Boundary and Pedestal ELM Control Operations Diagnostics Computing Support Visitors DIII-D Web Access Help IFT ITER-GA Theory Research Highlights Personnel Links Policies Safety Comp Support Trouble Ticket Eng/Design Fusion Webmail Phone Book

153

Simulation of Fusion Plasmas  

ScienceCinema (OSTI)

The upcoming ITER experiment (www.iter.org) represents the next major milestone in realizing the promise of using nuclear fusion as a commercial energy source, by moving into the ?burning plasma? regime where the dominant heat source is the internal fusion reactions. As part of its support for the ITER mission, the US fusion community is actively developing validated predictive models of the behavior of magnetically confined plasmas. In this talk, I will describe how the plasma community is using the latest high performance computing facilities to develop and refine our models of the nonlinear, multiscale plasma dynamics, and how recent advances in experimental diagnostics are allowing us to directly test and validate these models at an unprecedented level.

Chris Holland

2010-01-08T23:59:59.000Z

154

Evaluation of irradiation facility options for fusion materials research and development  

Science Journals Connector (OSTI)

Successful development of fusion energy will require the design of high-performance structural materials that exhibit dimensional stability and good resistance to fusion neutron degradation of mechanical and physical properties. The high levels of gaseous (H, He) transmutation products associated with deuterium–tritium (D–T) fusion neutron transmutation reactions, along with displacement damage dose requirements up to 50–200 displacements per atom (dpa) for a fusion demonstration reactor (DEMO), pose an extraordinary challenge. One or more intense neutron source(s) are needed to address two complementary missions: (1) scientific investigations of radiation degradation phenomena and microstructural evolution under fusion-relevant irradiation conditions (to provide the foundation for designing improved radiation resistant materials), and (2) engineering database development for design and licensing of next-step fusion energy machines such as a fusion DEMO. A wide variety of irradiation facilities have been proposed to investigate materials science phenomena and to test and qualify materials for a DEMO reactor. Some of the key technical considerations for selecting the most appropriate fusion materials irradiation source are summarized. Currently available and proposed facilities include fission reactors (including isotopic and spectral tailoring techniques to modify the rate of H and He production per dpa), dual- and triple-ion accelerator irradiation facilities that enable greatly accelerated irradiation studies with fusion-relevant H and He production rates per dpa within microscopic volumes, D–Li stripping reaction and spallation neutron sources, and plasma-based sources. The advantages and limitations of the main proposed fusion materials irradiation facility options are reviewed. Evaluation parameters include irradiation volume, potential for performing accelerated irradiation studies, capital and operating costs, similarity of neutron irradiation spectrum to fusion reactor conditions, temperature and irradiation flux stability/control, ability to perform multiple-effect tests (e.g., irradiation in the presence of a flowing coolant, or in the presence of complex applied stress fields), and technical maturity/risk of the concept. Ultimately, it is anticipated that heavy utilization of ion beam and fission neutron irradiation facilities along with sophisticated materials models, in addition to a dedicated fusion-relevant neutron irradiation facility, will be necessary to provide a comprehensive and cost-effective understanding of anticipated materials evolution in a fusion DEMO and to therefore provide a timely and robust materials database.

Steven J. Zinkle; Anton Möslang

2013-01-01T23:59:59.000Z

155

Key Outcomes:  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Key Points & Action Items Key Points & Action Items Inaugural Meeting Thursday, August 25, 2011 Renaissance Denver Hotel Denver, Colorado Participants Tracey LeBeau, Director, Pilar Thomas, Deputy Director, and Brandt Petrasek, Special Assistant, Department of Energy, Office of Indian Energy Policy and Programs; Vice Chairman Ronald Suppah and Jim Manion, Confederated Tribes of the Warm Springs Reservation of Oregon; William Micklin, Ewiiaapaayp Band of Kumeyaay Indians; Councilman Barney Enos, Jr., Jason Hauter, Gila River Indian Community; Mato Standing High, Rosebud Sioux Tribe; R. Allen Urban, Yocha Dehe Wintun Nation; Glen Andersen, Scott Hendrick, Brooke Oleen, Jacquelyn Pless, Jim Reed and Julia Verdi, National Conference of State Legislatures-staff

156

Economic analysis of fusion breeders  

SciTech Connect

This paper presents a study of the economic performance of Fission/Fusion Hybrid devices. This work takes fusion breeder cost estimates and applies methodology and cost factors used in the fission reactor programs to compare fusion breeders with Liquid Metal Fast Breeder Reactors (LMFBR). The results of the analysis indicate that the Hybrid will be in the same competitive range as proposed LMFBRs and have the potential to provide economically competitive power in a future of rising uranium prices. The sensitivity of the results to variations in key parameters is included.

Delene, J.G.

1985-01-01T23:59:59.000Z

157

An analysis of tritium and fissile fuel exchange in fusion-fission systems  

E-Print Network (OSTI)

production reactors, respectively. R denotes the reaction rate, which is the fusion rate for the hybrid fusion reactor and the fissile consumption rate for both types of fission reactors. C expresses the number of atoms produced per reaction and "a... production reactors, respectively. R denotes the reaction rate, which is the fusion rate for the hybrid fusion reactor and the fissile consumption rate for both types of fission reactors. C expresses the number of atoms produced per reaction and "a...

Rice, Brent Lee

2012-06-07T23:59:59.000Z

158

Fusion Power  

Science Journals Connector (OSTI)

...present cost of coal, on a per-unit-of-energy basis. Nuclear fusion is nuclear combustion, the process that heats the sun and...enough for the release of fusion energy to exceed the heat input; and third, convert the energy released to useful form...

R. F. Post

1971-01-01T23:59:59.000Z

159

Road Blocks Yield Key Information about a Catalyst | The Ames...  

NLE Websites -- All DOE Office Websites (Extended Search)

Road Blocks Yield Key Information about a Catalyst Researchers systematically blocked key chemical reaction pathways to get unambiguous information about how carbon-nitrogen bonds...

160

Fusion Prospects  

Science Journals Connector (OSTI)

...Ermesto Mazzucato Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA E-mail: mazzucato@pppl.gov Several recent letters proclaim once again the superior promise that thermonuclear fu-sion offers for future large-scale...

Ernesto Mazzucato

1996-02-16T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Fusion energy  

SciTech Connect

Larry Baylor explains how the US ITER team is working to prevent solar flare-like events at a fusion energy reactor that will be like a small sun on earth

Baylor, Larry

2014-05-02T23:59:59.000Z

162

Fusion energy  

ScienceCinema (OSTI)

Larry Baylor explains how the US ITER team is working to prevent solar flare-like events at a fusion energy reactor that will be like a small sun on earth

Baylor, Larry

2014-05-23T23:59:59.000Z

163

The Road to Controlled Nuclear Fusion  

Science Journals Connector (OSTI)

... is one atom of deuterium for every 7,000 atoms of ordinary hydrogen. Second, nuclear fusion does not generate as much radioactive waste as nuclear fission, so storage-a serious ... plants-does not constitute such a serious problem. By contrast with nuclear fission, however, nuclear fusion reactions cannot be sustained by themselves in matter which is in its normal state. ...

L. ARTSIMOVICH

1972-09-01T23:59:59.000Z

164

Fusion Power Associates Awards  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion Power Associates Awards Fusion Power Associates is "a non-profit, tax-exempt research and educational foundation, providing information on the status of fusion development...

165

Minimal fusion systems.  

E-Print Network (OSTI)

??We define minimal fusion systems in a way that every non-solvable fusion system has a section which is minimal. Minimal fusion systems can also be… (more)

Henke, Ellen

2010-01-01T23:59:59.000Z

166

Dynamic Instruction Fusion  

E-Print Network (OSTI)

SANTA CRUZ DYNAMIC INSTRUCTION FUSION A thesis submitted in4 2.2 Instruction Fusion & Complex10 3.1 Fusion Selection

Lee, Ian

2012-01-01T23:59:59.000Z

167

Experimental Fusion Research | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

confinement. The shiny metal keeps the particles from re-entering the plasma as a cold gas, retains impurities that can cool the plasma and halt fusion reactions, and...

168

Muon catalysed fusion for pellet ignition  

Science Journals Connector (OSTI)

... and ordinary fusion reaction rates. Simultaneously, or a short time beforehand, a pulse of muons (probably > 1010 in 1010 in muon energy distribution is selected such that most of the ...

W.P.S. Tan

1976-10-21T23:59:59.000Z

169

Synaptic vesicle fusion Josep Rizo1 and Christian Rosenmund2  

E-Print Network (OSTI)

homologs in most types of intracellular membrane fusion and include the Sec1/Munc18-1 (SM) protein Munc18Synaptic vesicle fusion Josep Rizo1 and Christian Rosenmund2 1Departments of Biochemistry is formed by SNARE complexes, which bring the vesicle and plasma membranes together and are key for fusion

Alford, Simon

170

The influence of projectile neutron number in the 208Pb(48Ti, n)255Rf and 208Pb(50Ti, n)257Rf reactions  

E-Print Network (OSTI)

type of reaction has been referred to as “cold fusion. ”Cold fusion reactions have been used in the discovery ofwe used as a guide in our cold fusion studies was recently

Dragojevic, I.

2008-01-01T23:59:59.000Z

171

Comparison of reactions for the production of 258,257Db: 208Pb(51V,xn) and 209Bi(50Ti,xn)  

E-Print Network (OSTI)

as 10 - 15 MeV, hence ‘cold’ fusion. These low excitationmodel for predicting cold fusion reaction cross sections [7,been produced in ‘cold’ nuclear fusion reactions with Pb and

Gates, Jacklyn M.

2008-01-01T23:59:59.000Z

172

RSNA 2002: Image Fusion Image Fusion  

E-Print Network (OSTI)

of anatomical feature #12;RSNA 2002: Image Fusion Types of Data to be Registered Anatomic CT, MRI, US DigitizedRSNA 2002: Image Fusion Image Fusion: Introduction to the Technology Charles A. Pelizzari, Ph.D. Department of Radiation and Cellular Oncology The University of Chicago #12;RSNA 2002: Image Fusion "Fusion

Pelizzari, Charles A.

173

Cluster dynamics transcending chemical dynamics toward nuclear fusion  

Science Journals Connector (OSTI)

...chemical dynamics toward nuclear fusion 10.1073/pnas.0508622103...optimization of table-top dd nuclear fusion driven by CE of deuterium containing...Huizenga J. R. ( 1992 ) Cold Fusion ( Oxford Univ. Press , Oxford...R. H. ( 1960 ) Controlled Thermonuclear Reactions ( Van Nostrand , New...

Andreas Heidenreich; Joshua Jortner; Isidore Last

2006-01-01T23:59:59.000Z

174

FUSION HINDRANCE and SYNTHESIS of SUPERHEAVY ELEMENTS , G. Kosenko2  

E-Print Network (OSTI)

FUSION HINDRANCE and SYNTHESIS of SUPERHEAVY ELEMENTS Y. Abe1 , G. Kosenko2 , C.W. Shen3 , B. But unexpectedly, fusion hindrance were observed and its reaction mechanism had not yet been understood well so and to provide the theoretical framework for calculation of fusion probability, the present authors et al. have

Paris-Sud XI, Université de

175

Synthesis of the isotopes of elements 118 and 116 in the {sup 249}Cf and {sup 245}Cm+{sup 48}Ca fusion reactions  

SciTech Connect

The decay properties of {sup 290}116 and {sup 291}116, and the dependence of their production cross sections on the excitation energies of the compound nucleus, {sup 293}116, have been measured in the {sup 245}Cm ({sup 48}Ca, xn){sup 293-x}116 reaction. These isotopes of element 116 are the decay daughters of element 118 isotopes, which are produced via the {sup 249}Cf+{sup 48}Ca reaction. We performed the element 118 experiment at two projectile energies, corresponding to {sup 297}118 compound nucleus excitation energies of E*=29.2{+-}2.5 and 34.4{+-}2.3 MeV. During an irradiation with a total beam dose of 4.1x10{sup 19} {sup 48}Ca projectiles, three similar decay chains consisting of two or three consecutive {alpha} decays and terminated by a spontaneous fission (SF) with high total kinetic energy of about 230 MeV were observed. The three decay chains originated from the even-even isotope {sup 294}118 (E{sub {alpha}}=11.65{+-}0.06 MeV, T{sub {alpha}}=0.89{sub -0.31}{sup +1.07} ms) produced in the 3n-evaporation channel of the {sup 249}Cf+{sup 48}Ca reaction with a maximum cross section of 0.5{sub -0.3}{sup +1.6} pb.

Oganessian, Yu. Ts.; Utyonkov, V. K.; Lobanov, Yu. V.; Abdullin, F. Sh.; Polyakov, A. N.; Sagaidak, R. N.; Shirokovsky, I. V.; Tsyganov, Yu. S.; Voinov, A. A.; Gulbekian, G. G.; Bogomolov, S. L.; Gikal, B. N.; Mezentsev, A. N.; Iliev, S.; Subbotin, V. G.; Sukhov, A. M.; Subotic, K.; Zagrebaev, V. I.; Vostokin, G. K.; Itkis, M. G. [Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); University of California, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)] (and others)

2006-10-15T23:59:59.000Z

176

Sub-barrier fusion with N/Z exotic beams of light nuclei Hence, sub-barrier fusion is sensitive to the density dependence  

E-Print Network (OSTI)

can sensitively examine the dependence of fusion on the isospin degree-of-freedom. Nuclear changes as reaction dynamics proceeds Present status of sub-barrier fusion with n-rich light nuclei models (improved understanding of fusion dynamics) · Constrain models of nuclear reactions in a neutron

de Souza, Romualdo T.

177

Fusion calculations with the Skyrme interactions  

Science Journals Connector (OSTI)

The effect on nuclear dynamics of using various parametrizations of the Skyrme potential is studied. In particular, fusion cross sections for the light system O16 + Mg24 are calculated for the interactions Skyrme II, Skyrme III, Skyrme IV, Skyrme V, and Skyrme VI. The interaction Skyrme III is shown to increase significantly the fusion cross section. An angular momentum window for fusion is observed to occur for Ec.m.?70 MeV.NUCLEAR REACTIONS O16(Mg24,x) in time-dependent Hartree-Fock approximation. Effect of nuclear interaction on fusion cross section.

S. J. Krieger and M. S. Weiss

1981-09-01T23:59:59.000Z

178

Fusion Induced by Radioactive Ion Beams  

E-Print Network (OSTI)

The use of radioactive beams opens a new frontier for fusion studies. The coupling to the continuum can be explored with very loosely bound nuclei. Experiments were performed with beams of nuclei at or near the proton and neutron drip-lines to measure fusion and associated reactions in the vicinity of the Coulomb barrier. In addition, the fusion yield is predicted to be enhanced in reactions involving very neutron-rich unstable nuclei. Experimental measurements were carried out to investigate if it is feasible to use such beams to produce new heavy elements. The current status of these experimental activities is given in this review.

J. F. Liang; C. Signorini

2005-04-26T23:59:59.000Z

179

Road Map for a Modular Magnetic Fusion Program Dale M. Meade  

E-Print Network (OSTI)

1 Road Map for a Modular Magnetic Fusion Program Dale M. Meade Princeton Plasma Physics Laboratory Princeton University During the past several decades magnetic fusion has made outstanding progress in understanding the science of fusion plasmas, the achievement of actual fusion plasmas and the development of key

180

TWO IMPORTANT FUSION PROCESSES CREATING THE CONDITIONS FOR FUSION  

NLE Websites -- All DOE Office Websites (Extended Search)

IMPORTANT FUSION PROCESSES CREATING THE CONDITIONS FOR FUSION F u s i o n Physics of a Fundamental Energy Source C o n f i n e m e n t Q u a l i t y , n τ ( m - 3 s ) 1970-75 1990s 1975-80 1980s Ion Temperature (K) 10 21 10 20 10 19 10 18 10 17 10 6 10 7 10 8 10 9 Inertial Magnetic Expected reactor regime Expected reactor regime Useful Nuclear Masses (The electron's mass is 0.000549 u.) Label Species Mass (u*) n ( 1 n) neutron 1.008665 p ( 1 H) proton 1.007276 D ( 2 H) deuteron 2.013553 T ( 3 H) triton 3.015500 3 He helium-3 3.014932 α ( 4 He) helium-4 4.001505 * 1 u = 1.66054 x 10 -27 kg = 931.466 MeV/c 2 Nuclear Mass (u) B i n d i n g E n e r g y P e r N u c l e o n ( M e V ) 1 200 150 100 50 10 0 5 62 Ni Fusion Reactions Release Energy Fission Reactions Release Energy EXPERIMENTAL RESULTS IN FUSION RESEARCH Fusion requires high tempera- ture plasmas confined long enough at high density

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Ch. 37, Inertial Fusion Energy Technology  

SciTech Connect

Nuclear fission, nuclear fusion, and renewable energy (including biofuels) are the only energy sources capable of satisfying the Earth's need for power for the next century and beyond without the negative environmental impacts of fossil fuels. Substantially increasing the use of nuclear fission and renewable energy now could help reduce dependency on fossil fuels, but nuclear fusion has the potential of becoming the ultimate base-load energy source. Fusion is an attractive fuel source because it is virtually inexhaustible, widely available, and lacks proliferation concerns. It also has a greatly reduced waste impact, and no danger of runaway reactions or meltdowns. The substantial environmental, commercial, and security benefits of fusion continue to motivate the research needed to make fusion power a reality. Replicating the fusion reactions that power the sun and stars to meet Earth's energy needs has been a long-sought scientific and engineering challenge. In fact, this technological challenge is arguably the most difficult ever undertaken. Even after roughly 60 years of worldwide research, much more remains to be learned. the magnitude of the task has caused some to declare that fusion is 20 years away, and always will be. This glib criticism ignores the enormous progress that has occurred during those decades, progress inboth scientific understanding and essential technologies that has enabled experiments producing significant amounts of fusion energy. For example, more than 15 megawatts of fusion power was produced in a pulse of about half a second. Practical fusion power plants will need to produce higher powers averaged over much longer periods of time. In addition, the most efficient experiments to date have required using about 50% more energy than the resulting fusion reaction generated. That is, there was no net energy gain, which is essential if fusion energy is to be a viable source of electricity. The simplest fusion fuels, the heavy isotopes of hydrogen (deuterium and tritium), are derived from water and the metal lithium, a relatively abundant resource. The fuels are virtually inexhaustible and they are available worldwide. Deuterium from one gallon of seawater would provide the equivalent energy of 300 gallons of gasoline, or over a half ton of coal. This energy is released when deuterium and tritium nuclei are fused together to form a helium nucleus and a neutron. The neutron is used to breed tritium from lithium. The energy released is carried by the helium nucleus (3.5 MeV) and the neutron (14 MeV). The energetic helium nucleus heats the fuel, helping to sustain the fusion reaction. Once the helium cools, it is collected and becomes a useful byproduct. A fusion power plant would produce no climate-changing gases.

Moses, E

2010-06-09T23:59:59.000Z

182

Modeling pionic fusion  

Science Journals Connector (OSTI)

Recently observed rare heavy ion fusion processes, where the entire available energy is carried away by a single pion, is an example of extreme collectivity in nuclear reactions. We calculate the cross section in the approximation of sudden overlap, modeling the initial and final nuclei by moving harmonic oscillator potentials. This allows for a fully quantum-mechanical treatment, exact conservation of linear and angular momenta and fulfillment of the Pauli principle. The results are in satisfactory agreement with data. Mass number dependence and general trends of the process are discussed.

Alexander Volya; Scott Pratt; Vladimir Zelevinsky

1999-01-01T23:59:59.000Z

183

A Strategic Program Plan for Fusion Energy Sciences Fusion Energy Sciences  

E-Print Network (OSTI)

, while creating manageable waste and little risk to public safety and health. Making fusion energy a part control a burning plasma that shares the characteris- tic intensity and power of the sun? · How can we use capable of producing a self-sustain- ing fusion reaction, called a "burning plasma." It is the next

184

Fusion Power  

Science Journals Connector (OSTI)

...later) of fusion fuel above its ignition point-about 100 million degrees...closely, so that prediction based on theory is becoming much more...new-generation experiments, based on the successes of the old...substantially lower than that of steam turbine-alternator conversion...

R. F. Post

1971-01-01T23:59:59.000Z

185

Heavy Element Synthesis Reactions W. Loveland Oregon State University  

NLE Websites -- All DOE Office Websites (Extended Search)

heavy element synthesis reactions and heavy element properties * Hot (E*35-60 MeV) and Cold (E*15 MeV) fusion reactions * Multi-nucleon transfer reactions * Fission * Atomic...

186

Cold Fusion Production and Decay of Neutron-Deficient Isotopes of Dubnium and Development of Extraction Systems for Group V Elements  

E-Print Network (OSTI)

of transfermium elements in cold fusion reactions." Physical1. Introduction Part I: Cold Fusion Production and Decay of1.2. Hot versus Cold Fusion 1.3. Excitation Functions 1.3.1.

Gates, Jacklyn M.

2008-01-01T23:59:59.000Z

187

Quantum Tunneling in Nuclear Fusion  

E-Print Network (OSTI)

Recent theoretical advances in the study of heavy ion fusion reactions below the Coulomb barrier are reviewed. Particular emphasis is given to new ways of analyzing data, such as studying barrier distributions; new approaches to channel coupling, such as the path integral and Green function formalisms; and alternative methods to describe nuclear structure effects, such as those using the Interacting Boson Model. The roles of nucleon transfer, asymmetry effects, higher-order couplings, and shape-phase transitions are elucidated. The current status of the fusion of unstable nuclei and very massive systems are briefly discussed.

A. B. Balantekin; N. Takigawa

1997-08-19T23:59:59.000Z

188

Sandia National Laboratories: Z Pulsed Power Facility: Z Research: Fusion  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion Fusion Sun Plasma The ultimate energy source Fusion occurs when two atomic nuclei are joined together. To fuse the atoms, the force that repels them as they come together must be overcome. Accelerators accomplish this by forcing molecules to collide with one another at very high temperatures (high temperatures are simply molecules moving at high speeds). When light nuclei are involved, fusion can produce more energy than was required to start the reaction. This process is the force that powers the Sun, whose source of energy is an ongoing fusion chain reaction. As an unconfined event, fusion was first developed for use in nuclear weapons. Fusion's great potential as a new energy source depends on scientists' ability to harness its power in laboratory events. The Z

189

HEAVY ION INERTIAL FUSION  

E-Print Network (OSTI)

Accelerators as Drivers for Inertially Confined Fusion, W.B.LBL-9332/SLAC-22l (1979) Fusion Driven by Heavy Ion Beams,OF CALIFORNIA f Accelerator & Fusion Research Division

Keefe, D.

2008-01-01T23:59:59.000Z

190

Fusion under a complex barrier  

Science Journals Connector (OSTI)

The mechanism of fusion of two heavy nuclei is formulated within the concept of transmission across a mildly absorptive effective fusion barrier (EFB). The intensity of transmitted waves across such a barrier could be represented by the product TRPS where TR stands for the transmission coefficient across the corresponding real barrier and PS is a factor of survival probability against absorption under the complex barrier. The justification of this result and the physical basis of the above EFB transmission model of fusion, which is complementary to the definition of fusion based on absorption in the interior region known as the direct reaction model (DRM), are demonstrated in the case of a complex square well potential with a complex rectangular barrier. Based on a WKB approach, expressions for TR for different partial waves utilizing a realistic nucleus-nucleus potential are derived. Using the resulting expressions for the fusion cross section (?F), the experimental values of ?F and the corresponding data of the average angular momentum of the fused body are explained satisfactorily over a wide range of energy around the Coulomb barrier in various heavy ion systems such as 16O+152,154Sm, 58,64Ni+58,64Ni, 64Ni+92Zr, and 64Ni+100Mo.

Basudeb Sahu; I. Jamir; E. F. P. Lyngdoh; C. S. Shastry

1998-04-01T23:59:59.000Z

191

data fusion 15 June 2012  

E-Print Network (OSTI)

real world data fusion Fred Daum 15 June 2012 data fusion Copyright © 2012 Raytheon Company. All fusion fusion of measurements performance fusion of tracks interesting parameter 3 #12;real world multi-sensor data fusion fusion of tracks performance fusion of measurements interesting parameter 4 #12;real world

Dobigeon, Nicolas

192

HEAVY ION INERTIAL FUSION  

E-Print Network (OSTI)

in the Tokamak Fusion Test Reactor which will be completedDrivers and Reactors for Inertial Confinement Fusion, K.A.

Keefe, D.

2008-01-01T23:59:59.000Z

193

Braided Fusion Categories First Conjecture  

E-Print Network (OSTI)

Braided Fusion Categories First Conjecture Second Conjecture Braided Weakly Integral Fusion Fusion Categories #12;Braided Fusion Categories First Conjecture Second Conjecture Outline 1 Braided Fusion Categories Preliminaries Dimensions and Braid Representations 2 First Conjecture Finiteness

Rowell, Eric C.

194

| International Atomic Energy Agency Nuclear Fusion Nucl. Fusion 54 (2014) 012002 (7pp) doi:10.1088/0029-5515/54/1/012002  

E-Print Network (OSTI)

| International Atomic Energy Agency Nuclear Fusion Nucl. Fusion 54 (2014) 012002 (7pp) doi:10 loads and particle bombardment is a key issue for the nuclear fusion community. Currently high current.1088/0029-5515/54/1/012002 LETTER Experimental simulation of materials degradation of plasma-facing components using lasers N. Farid

Harilal, S. S.

195

INSTITUTE OF PHYSICS PUBLISHING PLASMA PHYSICS AND CONTROLLED FUSION Plasma Phys. Control. Fusion 46 (2004) 471487 PII: S0741-3335(04)69034-8  

E-Print Network (OSTI)

INSTITUTE OF PHYSICS PUBLISHING PLASMA PHYSICS AND CONTROLLED FUSION Plasma Phys. Control. Fusion the cold plasma dispersion relation, the ion­ion hybrid cutoff frequency is uniquely determined and tritium density equilibrium (nD nT), maximizing fusion reactions in a burning plasma experiment. A number

Heidbrink, William W.

196

Radiochemical characteristics of tritium to be considered in fusion reactor facility design  

Science Journals Connector (OSTI)

The results of research and development related to radiochemical characteristics of tritium to be considered in a fusion reactor facility design are summarized. Reactions induced by...

S. O’hira; T. Hayashi; W. Shu; T. Yamanishi

2007-06-01T23:59:59.000Z

197

Fusion pumped light source  

DOE Patents (OSTI)

Apparatus is provided for generating energy in the form of light radiation. A fusion reactor is provided for generating a long, or continuous, pulse of high-energy neutrons. The neutron flux is coupled directly with the lasing medium. The lasing medium includes a first component selected from Group O of the periodic table of the elements and having a high inelastic scattering cross section. Gamma radiation from the inelastic scattering reactions interacts with the first component to excite the first component, which decays by photon emission at a first output wavelength. The first output wavelength may be shifted to a second output wavelength using a second liquid component responsive to the first output wavelength. The light outputs may be converted to a coherent laser output by incorporating conventional optics adjacent the laser medium.

Pappas, Daniel S. (Los Alamos, NM)

1989-01-01T23:59:59.000Z

198

An Integrated, Component-level Approach to Fusion Materials Development  

E-Print Network (OSTI)

1.1 e19 1.5 e 20 Vacuum Vessel 3.4 e11 4.5 e 12 Cryostat 3E+17 3 systems currently used are reactor viable - #12;Challenge of the Fusion Nuclear Environment - Plasma Wall and computational materials science are key tools to accelerate fusion materials development. However, as governing

199

Fusion Cross-Section Measurements with Deuterons of Low Energy  

Science Journals Connector (OSTI)

5 December 1961 research-article Fusion Cross-Section Measurements with Deuterons...theory and to calculations of the rate of thermonuclear reactions. Until now reliable values...cross-sections. The method of measuring the fusion cross-sections made use of an intense...

1961-01-01T23:59:59.000Z

200

Pathways to Inertial Fusion Energy Laser Direct Drive  

E-Print Network (OSTI)

(NRL) Smoothing by Spectral Dispersion ­ SSD (LLE) DT ice preheated ablator (lower density) DT ice "Gain" = Fusion power OUT / laser power IN 143/572 = 25% Recirculating power (Nuclear reactions (electricity) Target "Gain" = Fusion power OUT / laser power IN 143/880 = 16% Recirculating power (Nuclear

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Fusion Energy Sciences Network Requirements  

E-Print Network (OSTI)

Division, and the Office of Fusion Energy Sciences. This isFusion Energy Sciences NetworkRequirements Office of Fusion Energy Sciences Energy

Dart, Eli

2014-01-01T23:59:59.000Z

202

Muon catalysis for energy production by nuclear fusion  

Science Journals Connector (OSTI)

... mesic molecular ion (dt?-)+. It takes a short time tf for an exothermic nuclear fusion reaction d + t 4 He-hn to occur. When the probability is tdt, ...

Yu. V. Petrov

1980-06-12T23:59:59.000Z

203

Nuclear Fusion Driven by Coulomb Explosion of Methane Clusters  

Science Journals Connector (OSTI)

Nuclear Fusion Driven by Coulomb Explosion of Methane Clusters† ... However, the distributions obtained for Coulomb explosion lack the high-energy tail manifested for the thermal distribution (Figure 4), which is of considerable importance for thermonuclear reactions. ...

Isidore Last; Joshua Jortner

2002-09-20T23:59:59.000Z

204

Using Radio Waves to Control Fusion Plasma Density  

NLE Websites -- All DOE Office Websites (Extended Search)

heat goes to electrons instead of plasma ions, as would happen in the center of a self-sustaining fusion reaction. Supercomputer simulations run at the Department of Energy's...

205

FUSION OF DIGITAL ELEVATION MODELS USING SPARSE REPRESENTATIONS H. Papasaika1  

E-Print Network (OSTI)

FUSION OF DIGITAL ELEVATION MODELS USING SPARSE REPRESENTATIONS H. Papasaika1 , E. Kokiopoulou2 , E Science and Engineering, EPFL, Switzerland Working Groups I/2, III/1, III/4, III/5 KEY WORDS: DEMs, fusion acquisition technology, the processing chain, and the characteristics of the terrain. DEM fusion aims

Schindler, Konrad

206

OPTIONS FOR A STEADY-STATE COMPACT FUSION NEUTRON SOURCE M.P. Gryaznevich1  

E-Print Network (OSTI)

in the Fusion for Neutrons (F4N) approach. This is because the nuclear fusion reaction produces an abundance (power output over power input) to be viable as a power source, fusion still has a valuable role-fission process can provide a large gain over the input energy and yield sufficient heat output for economical

207

Bemerkungen zur "kalten Fusion"  

E-Print Network (OSTI)

Steven Jones et al. reported to have observed nuclear fusion at room temperature. They observed this "cold fusion" by electrolyzing heavy water. Later experiments confirmed these observations. These experiments confirmed the generation of strong electric fields within the deuterided metals. These electric fields accelerate the deuterons to keV energies and allow the observed nuclear fusion. Roman Sioda and I suggested a theoretical description of this nuclear fusion. Our "extended micro hot fusion" scenario explains how nuclear fusion can be generated over a long time within deuterided metals. Moreover we predicted the explosion of large pieces of deuterided metals. This article reviews the "cold fusion" work of Steven Jones et al. and discusses the fracto-fusion scenario. I show that the extended micro hot fusion scenario can explain the observed neutron emissions, neutron bursts, and heat bursts.

Rainer W. Kuehne

2006-04-14T23:59:59.000Z

208

Bemerkungen zur "kalten Fusion"  

E-Print Network (OSTI)

Steven Jones et al. reported to have observed nuclear fusion at room temperature. They observed this "cold fusion" by electrolyzing heavy water. Later experiments confirmed these observations. These experiments confirmed the generation of strong electric fields within the deuterided metals. These electric fields accelerate the deuterons to keV energies and allow the observed nuclear fusion. Roman Sioda and I suggested a theoretical description of this nuclear fusion. Our "extended micro hot fusion" scenario explains how nuclear fusion can be generated over a long time within deuterided metals. Moreover we predicted the explosion of large pieces of deuterided metals. This article reviews the "cold fusion" work of Steven Jones et al. and discusses the fracto-fusion scenario. I show that the extended micro hot fusion scenario can explain the observed neutron emissions, neutron bursts, and heat bursts.

Kuehne, R W

2006-01-01T23:59:59.000Z

209

Microscopic study of Ca$+$Ca fusion  

E-Print Network (OSTI)

We investigate the fusion barriers for reactions involving Ca isotopes $\\mathrm{^{40}Ca}+\\mathrm{^{40}Ca}$, $\\mathrm{^{40}Ca}+\\mathrm{^{48}Ca}$, and $\\mathrm{^{48}Ca}+\\mathrm{^{48}Ca}$ using the microscopic time-dependent Hartree-Fock theory coupled with a density constraint. In this formalism the fusion barriers are directly obtained from TDHF dynamics. We also study the excitation of the pre-equilibrium GDR for the $\\mathrm{^{40}Ca}+\\mathrm{^{48}Ca}$ system and the associated $\\gamma$-ray emission spectrum. Fusion cross-sections are calculated using the incoming-wave boundary condition approach. We examine the dependence of fusion barriers on collision energy as well as on the different parametrizations of the Skyrme interaction.

R. Keser; A. S. Umar; V. E. Oberacker

2012-02-17T23:59:59.000Z

210

Cold nuclear fusion in metallic hydrogen and normal metals  

Science Journals Connector (OSTI)

The rate of nuclear fusion from tunneling in very dense metallic hydrogen in the core of Jupiter is calculated to be 10-50 per hydrogen-deuterium pair per second. It is estimated that the width of the fusion barrier for deuterium in palladium or a similar metal must be reduced to, of order, 0.1 A? for the fusion rate to be 10-25 per deuterium per second. If this scale is achieved, the ratios of various nuclear reaction rates will be very different for cold versus thermonuclear fusion.

Charles J. Horowitz

1989-10-01T23:59:59.000Z

211

Fusion Power Associates, 2011 Annual Meeting 1 General Fusion  

E-Print Network (OSTI)

Fusion Power Associates, 2011 Annual Meeting 1 General Fusion #12;Fusion Power Associates, 2011 Annual Meeting 2 General Fusion Making commercially viable fusion power a reality. · Founded in 2002, based in Vancouver, Canada · Plan to demonstrate a fusion system capable of "net gain" within 3 years

212

Fusion Power Associates, 2012 Annual Meeting 1 General Fusion  

E-Print Network (OSTI)

Fusion Power Associates, 2012 Annual Meeting 1 General Fusion #12;Fusion Power Associates, 2012 Annual Meeting 2 General Fusion Making affordable fusion power a reality. · Founded in 2002, based to demonstrate the first fusion system capable of "net gain" 3 years after proof · Validated by leading experts

213

Fusion of Li and C and a search for entrance channel limitations to fusion cross sections  

Science Journals Connector (OSTI)

Excitation functions have been measured for reaction products from the Li6 and Li7 induced reactions Li6+C12, Li6+C13, Li7+C12, and Li7+C13. These data cover the energy range from Elab=9 to 36 MeV. It was found that the maximum fusion cross sections for these reactions are 780 and 770 mb for the Li6+C12 and Li6+C13, respectively, and 960 and 930 mb for the Li7+C12 and Li7+C13, respectively. The relative uncertainties for these maximum fusion cross sections are about 5%. Comparisons between optical model calculations of the total reaction cross sections and the measured fusion cross sections indicate that total fusion cross sections are substantially smaller than the total reaction cross sections for all four reactions at all energies. For each of the four entrance channels, energy and angular distributions have been measured at four energies for individual mass groups between A=9 and 19 u. Most of these products appear to be evaporation residues. The critical angular momenta deduced from the experimental fusion cross sections are discussed in terms of entrance channel and compound nucleus limitation models for compound nucleus formation. The individual mass groups are discussed in terms of systematics for evaporation residues.NUCLEAR REACTIONS Li6+C12, ELi6=10 to 36 MeV; Li6+C13, ELi6=9.23 to 35.08 MeV; Li7+C12, ELi7=10 to 38 MeV; Li7+C13, ELi7=10 to 34 MeV, measured d2?d? dE for reaction products from A=9 to 19. Extracted ?fus.

L. C. Dennis; K. M. Abdo; A. D. Frawley; K. W. Kemper

1982-09-01T23:59:59.000Z

214

Fusion Power Draws Another Step Closer  

Science Journals Connector (OSTI)

Fusion Power Draws Another Step Closer ... Their approach: Develop a three-stage magnetic compression mirror machine that can outdo the two-stage unit that was used to reach a plasma temperature of 35,000,000° C. for 10- 3 second, a feat which represents an important advance toward a controlled thermonuclear reaction. ...

1960-11-14T23:59:59.000Z

215

U.S.S.R. Fusion Research  

Science Journals Connector (OSTI)

U.S.S.R. Fusion Research ... Since the Atoms for Peace Conference in Geneva last year, little has been reported on the work being conducted in different countries to control and develop the use of thermonuclear reactions as a source of energy. ...

1956-05-28T23:59:59.000Z

216

Public Key Cryptography and Key Management  

Directives, Delegations, and Requirements

The use and management of certificate-based public key cryptography for the Department of Energy (DOE) requires the establishment of a public key infrastructure (PKI). This chapter defines the policy related to roles, requirements, and responsibilities for establishing and maintaining a DOE PKI and the documentation necessary to ensure that all certificates are managed in a manner that maintains the overall trust required to support a viable PKI. Canceled by DOE N 251.112.

2000-02-15T23:59:59.000Z

217

Yield from Proton-Induced Reaction on Light Element Isotopes in the Hydrogen Plasma Focus  

Science Journals Connector (OSTI)

The high Q-value of some (p,?) fusion reactions is very important in the investigation that can lead to power production with controlled fusion using advanced fuels (hydrogen-lithium-7, hydrogen-boron-11). For th...

V. Udovi?i?; A. Dragi?; R. Banjanac; D. Jokovi?; N. Veselinovi?…

2011-12-01T23:59:59.000Z

218

Dynamic Instruction Fusion  

E-Print Network (OSTI)

and energy efficient register file (Transient Register File) tightly coupled to the Fusion ALU in order to provide

Lee, Ian

2012-01-01T23:59:59.000Z

219

Fusion systems of -type  

Science Journals Connector (OSTI)

We prove results on 2-fusion systems related to the 2-fusion systems of groups of Lie type over the field of order 2 and certain sporadic groups. The results are used in a later paper to determine the N-systems: the 2-fusion systems of N-groups.

Michael Aschbacher

2013-01-01T23:59:59.000Z

220

Ion beam fusion  

Science Journals Connector (OSTI)

...that converts the fusion and blanket energy into...target gain G is the thermonuclear energy produced by the...Most concep- tual fusion power plants have a...and the International Thermonuclear Experimental Reactor...situation, the inertial fusion com- munity in the...

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Fusion Plasmas Martin Greenwald  

E-Print Network (OSTI)

. Despite the cold war, which raged for another 30 years, controlled fusion research became a modelFusion Plasmas Martin Greenwald Encyclopedia of Electrical and Electronic Engineering, John Webster - editor, published by John Wiley & Sons, New York (1999) #12;Controlled Fusion For half a century

Greenwald, Martin

222

Cluster-impact fusion  

Science Journals Connector (OSTI)

We present a model for the cluster-impact-fusion experiments of Buehler, Friedlander, and Friedman, Calculated fusion rates as a function of bombarding energy for constant cluster size agree well with experiment. The dependence of the fusion rate on cluster size at fixed bombarding energy is explained qualitatively. The role of correlated, coherent collisions in enhanced energy loss by clusters is emphasized.

P. M. Echenique; J. R. Manson; R. H. Ritchie

1990-03-19T23:59:59.000Z

223

Presented by Information Fusion  

E-Print Network (OSTI)

Presented by Information Fusion: Science and Engineering of Combining Information from Multiple's Office of Science #12;2 Managed by UT-Battelle for the U.S. Department of Energy Rao_InfoFusion_SC10 Information Fusion at ORNL ďż˝ ORNL Instrumental in formulating and fostering this multi-disciplinary area

224

Fusion reactor systems  

Science Journals Connector (OSTI)

In this review we consider deuterium-tritium (D-T) fusion reactors based on four different plasma-confinement and heating approaches: the tokamak, the theta-pinch, the magnetic-mirror, and the laser-pellet system. We begin with a discussion of the dynamics of reacting plasmas and basic considerations of reactor power balance. The essential plasma physical aspects of each system are summarized, and the main characteristics of the corresponding conceptual power plants are described. In tokamak reactors the plasma densities are about 1020 m-3, and the ? values (ratio of plasma pressure to confining magnetic pressure) are approximately 5%. Plasma burning times are of the order of 100-1000 sec. Large superconducting dc magnets furnish the toroidal magnetic field, and 2-m thick blankets and shields prevent heat deposition in the superconductor. Radially diffusing plasma is diverted away from the first wall by means of null singularities in the poloidal (or transverse) component of the confining magnetic field. The toroidal theta-pinch reactor has a much smaller minor diameter and a much larger major diameter, and operates on a 10-sec cycle with 0.1-sec burning pulses. It utilizes shock heating from high-voltage sources and adabatic-compression heating powered by low-voltage, pulsed cryogenic magnetic or inertial energy stores, outside the reactor core. The plasma has a density of about 1022 m-3 and ? values of nearly unity. In the power balance of the reactor, direct-conversion energy obtained by expansion of the burning high-? plasma against the containing magnetic field is an important factor. No divertor is necessary since neutral-gas flow cools and replaces the "spent" plasma between pulses. The open-ended mirror reactor uses both thermal conversion of neutron energy and direct conversion of end-loss plasma energy to dc electrical power. A fraction of this direct-convertor power is then fed back to the ioninjection system to sustain the reaction and maintain the plasma. The average ion energy is 600 keV, plasma diameter 6 m, and the plasma beta 85%. The power levels of the three magnetic-confinement devices are in the 500-2000 MWe range, with the exception of the mirror reactor, for which the output is approximately 200 MWe. In Laser-Pellet reactors, frozen D-T pellets are ignited in a cavity which absorbs the electromagnetic, charged particle, and neutron energy from the fusion reaction. The confinement is "inertial," since the fusion reaction occurs during the disassembly of the heated pellet. A pellet-cavity unit would produce about 200 MWt in pulses with a repetition rate of the order of 10 sec-1. Such units could be clustered to give power plants with outputs in the range of 1000 MWe.

F. L. Ribe

1975-01-01T23:59:59.000Z

225

Lab Breakthrough: Neutron Science for the Fusion Mission | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Neutron Science for the Fusion Mission Neutron Science for the Fusion Mission Lab Breakthrough: Neutron Science for the Fusion Mission May 16, 2012 - 9:52am Addthis An accelerator team lead by Robert McGreevy at Oak Ridge National Laboratory is testing material - a critical role in building an experimental fusion reactor for commercial use. As part of the international coalition, they expect to have an operational reactor by 2050. View the entire Lab Breakthrough playlist. Michael Hess Michael Hess Former Digital Communications Specialist, Office of Public Affairs What is the difference between fusion and fission? Fission pulls molecules apart. This type of reactor runs nuclear power plants. Fusion puts molecules together. This type of reaction powers the Sun. Oak Ridge National Laboratory scientist Robert McGreevy explains the

226

AFRD - Fusion Energy Science  

NLE Websites -- All DOE Office Websites (Extended Search)

Heavy Ion Fusion Virtual National Laboratory Heavy Ion Fusion Virtual National Laboratory AFRD - Fusion Energy Sciences AFRD - Home Fusion - Home HIF-VNL Website Ion Beam Technology Group website Artist's conception of a heavy ion fusion power plant Artist's conception of an IFE powerplant We further inertial fusion energy as a future power source, primarily through R&D on heavy-ion induction accelerators. Our program is part of a "Virtual National Laboratory," headquartered in AFRD, that joins us with Lawrence Livermore National Laboratory and the Princeton Plasma Physics Laboratory in close collaboration on inertial fusion driven by beams of heavy ions. The related emergent science of high-energy-density physics (HEDP) has become a major focus. For further synergy, we have combined forces with the former Ion Beam

227

Atomic Physics and Thermonuclear Fusion Research  

Science Journals Connector (OSTI)

Presently thermonuclear fusion research is faced with a number of atomic and molecular physics problems depending on the type of high-temperature plasma investigated. The present article discusses some particular atomic physics aspects in connection with magnetically confined plasmas (Tokamaks, Stellarators): (1) rate equations for density, momentum and energy with application to plasmas; (2) initial phase of Tokamak plasmas; (3) influence of impurity radiation on operating conditions of fusion plasmas in general and on Tokamak plasmas in particular; (4) influence of atomic elementary reactions on thermodynamic plasma properties; (5) level structures of highly ionized atoms; (6) spectroscopic diagnostic problems.

H W Drawin

1981-01-01T23:59:59.000Z

228

Fusion and Plasmas | U.S. DOE Office of Science (SC)  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion and Fusion and Plasmas Fusion Energy Sciences (FES) FES Home About Staff Organization Chart .pdf file (104KB) FES Budget FES Committees of Visitors Directions Jobs Fusion and Plasmas Research Facilities Science Highlights Benefits of FES Funding Opportunities Fusion Energy Sciences Advisory Committee (FESAC) News & Resources Contact Information Fusion Energy Sciences U.S. Department of Energy SC-24/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-4941 F: (301) 903-8584 E: sc.fes@science.doe.gov More Information » About Fusion and Plasmas Print Text Size: A A A RSS Feeds FeedbackShare Page WHAT IS FUSION? a Fusion the process that powers the sun and the stars. In one type of this reaction, two atoms of hydrogen combine together, or , to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy. The easiest fusion reaction to make happen combines (or "heavy hydrogen") with (or "heavy-heavy hydrogen") to make and a . Deuterium is plentifully available in ordinary water. Tritium can be produced by combining the fusion neutron with the abundant light metal . Thus fusion has the potential to be an inexhaustible source of energy.

229

Reviving Cold Fusion  

Science Journals Connector (OSTI)

Reviving Cold Fusion ... In March 1989, electrochemists B. Stanley Pons and Martin Fleischmann announced at a press conference at the University of Utah that they had tamed the power of nuclear fusion in a benchtop electrolysis experiment. ... The discovery of cold fusion, as it came to be called, held the promise of endless amounts of pollution-free energy being generated from the natural deuterium in water. ...

STEPHEN K. RITTER

2012-05-14T23:59:59.000Z

230

Cold Fusion Fiasco  

Science Journals Connector (OSTI)

Cold Fusion Fiasco ... When two chemists, B. Stanley Pons and Martin Fleischmann, announced to the world's press on March 23, 1989, that they had discovered fusion in a test tube, they launched the equivalent of a scientific gold rush. ... Within a day of that infamous Utah press conference, physicist Stephen Jones at nearby Brigham Young University claimed that he, too, had been detecting neutrons from a cold fusion cell. ...

TREVOR PINCH

1992-01-13T23:59:59.000Z

231

E-Print Network 3.0 - alpha induced reactions Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

production balances the various energy losses and the fusion reaction is self-sustaining. The product ions... (alpha particles in the case of a deuterium-tritium plasma)...

232

Fission, Fusion Materials Facility  

NLE Websites -- All DOE Office Websites (Extended Search)

is shown in illustration. Materials are the immediate priority of both the fission and fusion communities. Extending the lifetime of the current fleet of light water reactors...

233

AEC Pushes Fusion Reactors  

Science Journals Connector (OSTI)

AEC Pushes Fusion Reactors ... Project Sherwood, as the study program is called, began in 1951-52 soon after the first successful thermonuclear explosion in the Pacific. ...

1955-10-10T23:59:59.000Z

234

Path toward fusion energy  

SciTech Connect

A brief history of the fusion research program is given. Some of the problems that plagued the developmental progress are described. (MOW)

Furth, H.P.

1985-08-01T23:59:59.000Z

235

flame-fusion process  

Science Journals Connector (OSTI)

...a method of gem synthesis based on Verneuil process (furnace) used in growing synthetic single crystals to distinguish from a melt or flux fusion. Verneuil furnace .

2009-01-01T23:59:59.000Z

236

Fusion Energy Sciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Production Computing and Storage Requirements for Fusion Energy Sciences: Target 2017 The NERSC Program Requirements Review "Large Scale Production Computing and...

237

Photons & Fusion Newsletter - 2014  

NLE Websites -- All DOE Office Websites (Extended Search)

news Photons & Fusion Newsletter - 2014 May ARC Beamlet Profiles NIF Petawatt Laser Is on Track to Completion The Advanced Radiographic Capability (ARC), a petawatt-class laser now...

238

Fusion Energy Sciences Jobs  

Office of Science (SC) Website

Title: Administrative Support Specialist 15 DE SC HQ 013
Office: Fusion Energy Sciences
URL:

239

Fusion dynamics of symmetric systems near barrier energies  

E-Print Network (OSTI)

The enhancement of the sub-barrier fusion cross sections was explained as the lowering of the dynamical fusion barriers within the framework of the improved isospin-dependent quantum molecular dynamics (ImIQMD) model. The numbers of nucleon transfer in the neck region are appreciably dependent on the incident energies, but strongly on the reaction systems. A comparison of the neck dynamics is performed for the symmetric reactions $^{58}$Ni+$^{58}$Ni and $^{64}$Ni+$^{64}$Ni at energies in the vicinity of the Coulomb barrier. An increase of the ratios of neutron to proton in the neck region at initial collision stage is observed and obvious for neutron-rich systems, which can reduce the interaction potential of two colliding nuclei. The distribution of the dynamical fusion barriers and the fusion excitation functions are calculated and compared them with the available experimental data.

Zhao-Qing Feng; Gen-Ming Jin

2009-09-06T23:59:59.000Z

240

Liquid Vortex Shielding for Fusion Energy Applications  

SciTech Connect

Swirling liquid vortices can be used in fusion chambers to protect their first walls and critical elements from the harmful conditions resulting from fusion reactions. The beam tube structures in heavy ion fusion (HIF) must be shielded from high energy particles, such as neutrons, x-rays and vaporized coolant, that will cause damage. Here an annular wall jet, or vortex tube, is proposed for shielding and is generated by injecting liquid tangent to the inner surface of the tube both azimuthally and axially. Its effectiveness is closely related to the vortex tube flow properties. 3-D particle image velocimetry (PIV) is being conducted to precisely characterize its turbulent structure. The concept of annular vortex flow can be extended to a larger scale to serve as a liquid blanket for other inertial fusion and even magnetic fusion systems. For this purpose a periodic arrangement of injection and suction holes around the chamber circumference are used, generating the layer. Because it is important to match the index of refraction of the fluid with the tube material for optical measurement like PIV, a low viscosity mineral oil was identified and used that can also be employed to do scaled experiments of molten salts at high temperature.

Bardet, Philippe M. [University of California, Berkeley (United States); Supiot, Boris F. [University of California, Berkeley (United States); Peterson, Per F. [University of California, Berkeley (United States); Savas, Oemer [University of California, Berkeley (United States)

2005-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Unique capabilities of the fusion product separator SOLITAIRE  

SciTech Connect

SOLITAIRE is a powerful tool to study nuclear fusion, having a very large angular acceptance and good rejection of beam particles. This report shows how this device, combined with a high quality ray-tracing code, can give information about both the evaporation residue angular distribution and cross section from a single measurement. Results are shown for {sup 32}S+{sup 89}Y and {sup 58}Ni+{sup 58,60,64}Ni fusion reactions.

Rodriguez, M. D.; Brown, M. L.; Dasgupta, M.; Hinde, D. J. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, ACT 0200, Canberra (Australia)

2009-03-04T23:59:59.000Z

242

Fusion Energy Sciences Network Requirements  

E-Print Network (OSTI)

Network Research) C.S. Chang, PPPL (Fusion Simulations) EliGreenwald, MIT PSFC (Alcator C-Mod) Paul Henderson, PPPL (PPPL Networking) Steve Jardin, PPPL (Fusion Simulations)

Dart, Eli

2014-01-01T23:59:59.000Z

243

Fusion Energy Sciences Network Requirements  

E-Print Network (OSTI)

the world’s first reactor-scale fusion device in Cadarache,vital to fusion research, as the newest reactors are those

Dart, Eli

2014-01-01T23:59:59.000Z

244

Fusion tritons and plasma-facing components in a fusion reactor  

Science Journals Connector (OSTI)

We would like to discuss the role that 1?MeV tritons produced in deuterium–deuterium fusion reactions might play in a long-pulse or steady-state fusion reactor. Albeit a small minority in quantity compared to the fuel tritium, the fusion tritons have significantly longer penetration length in materials and can have detrimental consequences for the integrity of the components. Because deeply deposited atoms are not easily removed from the plasma-facing components, the fusion tritium inventory in a steady-state device is expected to be limited only by decay. Furthermore, unlike fuel tritium, it is not evenly distributed on the plasma-facing components. We conclude that, of the materials considered here, tungsten appears better than carbon or beryllium in this respect. Nonetheless, 1?MeV tritons from deuterium fusion should not be neglected when making material choices for ITER and, especially, for future fusion reactors. In particular, studies on the bulk effects of deeply penetrated tritium in tungsten are urgently needed if metal-wall reactors are considered for the future. This is an interdisciplinary problem needing the attention of material scientists and plasma physicists.

T. Kurki-Suonio; V. Hynönen; T. Ahlgren; K. Nordlund; K. Sugiyama; R. Dux

2007-01-01T23:59:59.000Z

245

Controlled Nuclear Fusion  

Science Journals Connector (OSTI)

... papers have an English abstract. Translations of the Russian papers have already been published in Nuclear Fusion. It is a great pity, for Western readers at least, that the Russian ... two volumes are obviously going to be standard reference books for those interested in controlled nuclear fusion. They also contain a large amount of information, particularly on the theoretical side, ...

GEORGE ROWLANDS

1970-01-31T23:59:59.000Z

246

Polyploidy and Nuclear Fusion  

Science Journals Connector (OSTI)

... mitotic figures, reported during delayed wound healing in Rhodnius11, are likewise the result of nuclear fusion. Polyploid nuclei are far more plentiful in the fat body of Rhodnius after extreme ... starved for long periods. It is probable that this occasional polyploidy also is due to nuclear fusion. Endomitosis, however, occurs regularly in the fat body of Rhodnius as in other ...

V. B. WIGGLESWORTH

1966-12-31T23:59:59.000Z

247

The Nuclear Fusion Award  

Science Journals Connector (OSTI)

The Nuclear Fusion Award ceremony for 2009 and 2010 award winners was held during the 23rd IAEA Fusion Energy Conference in Daejeon. This time, both 2009 and 2010 award winners were celebrated by the IAEA and the participants of the 23rd IAEA Fusion Energy Conference. The Nuclear Fusion Award is a paper prize to acknowledge the best distinguished paper among the published papers in a particular volume of the Nuclear Fusion journal. Among the top-cited and highly-recommended papers chosen by the Editorial Board, excluding overview and review papers, and by analyzing self-citation and non-self-citation with an emphasis on non-self-citation, the Editorial Board confidentially selects ten distinguished papers as nominees for the Nuclear Fusion Award. Certificates are given to the leading authors of the Nuclear Fusion Award nominees. The final winner is selected among the ten nominees by the Nuclear Fusion Editorial Board voting confidentially. 2009 Nuclear Fusion Award nominees For the 2009 award, the papers published in the 2006 volume were assessed and the following papers were nominated, most of which are magnetic confinement experiments, theory and modeling, while one addresses inertial confinement. Sabbagh S.A. et al 2006 Resistive wall stabilized operation in rotating high beta NSTX plasmas Nucl. Fusion 46 635–44 La Haye R.J. et al 2006 Cross-machine benchmarking for ITER of neoclassical tearing mode stabilization by electron cyclotron current drive Nucl. Fusion 46 451–61 Honrubia J.J. et al 2006 Three-dimensional fast electron transport for ignition-scale inertial fusion capsules Nucl. Fusion 46 L25–8 Ido T. et al 2006 Observation of the interaction between the geodesic acoustic mode and ambient fluctuation in the JFT-2M tokamak Nucl. Fusion 46 512–20 Plyusnin V.V. et al 2006 Study of runaway electron generation during major disruptions in JET Nucl. Fusion 46 277–84 Pitts R.A. et al 2006 Far SOL ELM ion energies in JET Nucl. Fusion 46 82–98 Berk H.L. et al 2006 Explanation of the JET n = 0 chirping mode Nucl. Fusion 46 S888–97 Urano H. et al 2006 Confinement degradation with beta for ELMy HH-mode plasmas in JT-60U tokamak Nucl. Fusion 46 781–7 Izzo V.A. et al 2006 A numerical investigation of the effects of impurity penetration depth on disruption mitigation by massive high-pressure gas jet Nucl. Fusion 46 541–7 Inagaki S. et al 2006 Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas Nucl. Fusion 46 133–41 Watanabe T.-H. et al 2006 Velocity–space structures of distribution function in toroidal ion temperature gradient turbulence Nucl. Fusion 46 24–32 2010 Nuclear Fusion Award nominees For the 2010 award, the papers published in the 2007 volume were assessed and the following papers were nominated, all of which are magnetic confinement experiments and theory. Rice J.E. et al 2007 Inter-machine comparison of intrinsic toroidal rotation in tokamaks Nucl. Fusion 47 1618–24 Lipschultz B. et al 2007 Plasma–surface interaction, scrape-off layer and divertor physics: implications for ITER Nucl. Fusion 47 1189–205 Loarer T. et al 2007 Gas balance and fuel retention in fusion devices Nucl. Fusion 47 1112–20 Garcia O.E et al 2007 Fluctuations and transport in the TCV scrape-off layer Nucl. Fusion 47 667–76 Zonca F. et al 2007 Electron fishbones: theory and experimental evidence Nucl. Fusion 47 1588–97 Maggi C.F. et al 2007 Characteristics of the H-mode pedestal in improved confinement scenarios in ASDEX Upgrade, DIII-D, JET and JT-60U Nucl. Fusion 47 535–51 Yoshida M. et al 2007 Momentum transport and plasma rotation profile in toroidal direction in JT-60U L-mode plasmas Nucl. Fusion 47 856–63 Zohm H. et al 2007 Control of MHD instabilities by ECCD: ASDEX Upgrade results and implications for ITER Nucl. Fusion 47 228–32 Snyder P.B. et al 2007 Stability and dynamics of the edge pedestal in the low collisionality regime: physics mechanisms for steady-state ELM-free operation Nucl. Fusion 47 961–8 Urano H. et al 2007 H-mode pedestal structure in the v

M. Kikuchi

2011-01-01T23:59:59.000Z

248

Lysolecithin and Cell Fusion  

Science Journals Connector (OSTI)

... INTEREST in the fusion of biological membranes has recently been stimulated by investigations on the biochemistry of secretion1, ... of membranes in the lysosomal vacuolar system2 and, in particular, by work on the fusion of cells that is induced by viruses3'4. For C3ll ...

A. R. POOLE; J. I. HOWELL; J. A. LUCY

1970-08-22T23:59:59.000Z

249

Fusion Plasma Performance Required for Fusion Power The performance achieved on MFE and IFE fusion experiments using DT fuel is compared with the fusion performance  

E-Print Network (OSTI)

Fusion Plasma Performance Required for Fusion Power The performance achieved on MFE and IFE fusion experiments using DT fuel is compared with the fusion performance required for a Fusion Power Plant. Const. Cost $B Date

250

Alperin's Fusion Theorem and Fusion Systems David A. Craven  

E-Print Network (OSTI)

-called domestic intersections, which are special types of tame intersections that should play a role in fusionAlperin's Fusion Theorem and Fusion Systems David A. Craven September 2010 Abstract This short note provides a new and straightforward proof of the original fusion theorem of Alperin, then considers so

Craven, David A.

251

Up-Fusion: An Evolving Multimedia Decision Fusion Xiangyu Wang  

E-Print Network (OSTI)

Up-Fusion: An Evolving Multimedia Decision Fusion Method Xiangyu Wang National Univ. of Singapore multimedia's nature of hav- ing multiple information sources, fusion methods are criti- cal for its data analysis and understanding. However, most of the traditional fusion methods are static with respect to time

Rui, Yong

252

A TUTORIAL ON IGNITION AND GAIN FOR SMALL FUSION TARGETS  

SciTech Connect

Nuclear fusion was discovered experimentally in 1933-34 and other charged particle nuclear reactions were documented shortly thereafter. Work in earnest on the fusion ignition problem began with Edward Teller's group at Los Alamos during the war years. His group quantified all the important basic atomic and nuclear processes and summarized their interactions. A few years later, the success of the early theory developed at Los Alamos led to very successful thermonuclear weapons, but also to decades of unsuccessful attempts to harness fusion as an energy source of the future. The reasons for this history are many, but it seems appropriate to review some of the basics with the objective of identifying what is essential for success and what is not. This tutorial discusses only the conditions required for ignition in small fusion targets and how the target design impacts driver requirements. Generally speaking, the driver must meet the energy, power and power density requirements needed by the fusion target. The most relevant parameters for ignition of the fusion fuel are the minimum temperature and areal density (rhoR), but these parameters set secondary conditions that must be achieved, namely an implosion velocity, target size and pressure, which are interrelated. Despite the apparent simplicity of inertial fusion targets, there is not a single mode of fusion ignition, and the necessary combination of minimum temperature and areal density depends on the mode of ignition. However, by providing a magnetic field of sufficient strength, the conditions needed for fusion ignition can be drastically altered. Magnetized target fusion potentially opens up a vast parameter space between the extremes of magnetic and inertial fusion.

Kirkpatrick, R. C. [Los Alamos National Laboratory, Los Alamos, NM 087545 (United States)

2009-07-26T23:59:59.000Z

253

ARM - Key Science Questions  

NLE Websites -- All DOE Office Websites (Extended Search)

govScienceKey Science Questions govScienceKey Science Questions Science Research Themes Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) ARM Science Team Meetings User Meetings Annual Meetings of the Atmospheric System Research (ASR) Science Team and Fall Working Groups Accomplishments Read about the 20 years of accomplishments (PDF, 696KB) from the ARM Program and user facility. Performance Metrics ASR Metrics 2009 2008 2007 2006 Key Science Questions The role of clouds and water vapor in climate change is not well understood; yet water vapor is the largest greenhouse gas and directly affects cloud cover and the propagation of radiant energy. In fact, there may be positive feedback between water vapor and other greenhouse gases. Carbon dioxide and other gases from human activities slightly warm the

254

Fusion Energy Sciences Program Mission  

E-Print Network (OSTI)

Fusion Energy Sciences Program Mission The Fusion Energy Sciences (FES) program leads the national for an economically and environmentally attractive fusion energy source. The National Energy Policy states that fusion power has the long-range potential to serve as an abundant and clean source of energy and recommends

255

Network Fusion Pascal Fradet1  

E-Print Network (OSTI)

Network Fusion Pascal Fradet1 and St´ephane Hong Tuan Ha2 1 INRIA Rh^one-Alpes 655, av. de l composition method which strives to reconcile modularity and efficiency. Our technique, network fusion fusion. Fusion allows to replace internal commu- nications by assignments and alleviates most time

Paris-Sud XI, Université de

256

Beyond the Coherent Coupled Channels Description of Nuclear Fusion  

SciTech Connect

New measurements of fusion cross sections at deep sub-barrier energies for the reactions {sup 16}O+{sup 204,208}Pb show a steep but almost saturated logarithmic slope, unlike {sup 64}Ni-induced reactions. Coupled channels calculations cannot simultaneously reproduce these new data and above-barrier cross-sections with the same Woods-Saxon nuclear potential. It is argued that this highlights an inadequacy of the coherent coupled channels approach. It is proposed that a new approach explicitly including gradual decoherence is needed to allow a consistent description of nuclear fusion.

Dasgupta, M.; Hinde, D. J.; Diaz-Torres, A.; Bouriquet, B.; Low, Catherine I.; Newton, J. O. [Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 (Australia); Milburn, G. J. [Department of Physics, University of Queensland, St. Lucia, QLD 4072 (Australia)

2007-11-09T23:59:59.000Z

257

Cluster-impact fusion  

Science Journals Connector (OSTI)

Deuteron-deuteron fusion, detected via the 3-MeV protons produced, is shown to occur when singly charged clusters of 25 to 1300 D2O molecules, accelerated to 200 to 325 keV, impinge on TiD targets. The energy and cluster-size dependence of the fusion rate are discussed. The fusion events are shown to originate from the cluster-ion impacts rather than from D+ or D2O+ ions in the beam. The observed rates may be correlated with the compressions and high energy densities created in collision spikes by cluster-ion impacts.

R. J. Beuhler; G. Friedlander; L. Friedman

1989-09-18T23:59:59.000Z

258

Cold fusion research  

Science Journals Connector (OSTI)

Cold fusion research ... Eugene Mallove (C&EN, Feb. 10, page 2) accuses Trevor Pinch and me of "arrogant misunderstanding of cold fusion research/' Casting his net further, he then accuses the scientific establishment and some science media of "arrogant dismissal" of a "new phenomenon of unparalleled signficance," because we regard it as "a priori impossible." ... The latter, at least, is untrue, as should be apparent to anyone who read even the first three pages of 'Too Hot to Handle," where I wrote, 'liven though intuitive[ ly we felt] that [cold fusion] was too far-fetched to be real, nonetheless it had to be checked." ...

FRANK E. CLOSE

1992-04-13T23:59:59.000Z

259

Spherical torus fusion reactor  

DOE Patents (OSTI)

The object of this invention is to provide a compact torus fusion reactor with dramatic simplification of plasma confinement design. Another object of this invention is to provide a compact torus fusion reactor with low magnetic field and small aspect ratio stable plasma confinement. In accordance with the principles of this invention there is provided a compact toroidal-type plasma confinement fusion reactor in which only the indispensable components inboard of a tokamak type of plasma confinement region, mainly a current conducting medium which carries electrical current for producing a toroidal magnet confinement field about the toroidal plasma region, are retained.

Martin Peng, Y.K.M.

1985-10-03T23:59:59.000Z

260

Multishell inertial confinement fusion target  

DOE Patents (OSTI)

A method of fabricating multishell fuel targets for inertial confinement fusion usage. Sacrificial hemispherical molds encapsulate a concentric fuel pellet which is positioned by fiber nets stretched tautly across each hemispherical mold section. The fiber ends of the net protrude outwardly beyond the mold surfaces. The joint between the sacrificial hemispheres is smoothed. A ceramic or glass cover is then deposited about the finished mold surfaces to produce an inner spherical surface having continuously smooth surface configuration. The sacrificial mold is removed by gaseous reaction accomplished through the porous ceramic cover prior to enclosing of the outer sphere by addition of an outer coating. The multishell target comprises the inner fuel pellet concentrically arranged within a surrounding coated cover or shell by fiber nets imbedded within the cover material.

Holland, James R. (Butler, PA); Del Vecchio, Robert M. (Vandergrift, PA)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Multishell inertial confinement fusion target  

DOE Patents (OSTI)

A method of fabricating multishell fuel targets for inertial confinement fusion usage. Sacrificial hemispherical molds encapsulate a concentric fuel pellet which is positioned by fiber nets stretched tautly across each hemispherical mold section. The fiber ends of the net protrude outwardly beyond the mold surfaces. The joint between the sacrificial hemispheres is smoothed. A ceramic or glass cover is then deposited about the finished mold surfaces to produce an inner spherical surface having continuously smooth surface configuration. The sacrificial mold is removed by gaseous reactions accomplished through the porous ceramic cover prior to enclosing of the outer sphere by addition of an outer coating. The multishell target comprises the inner fuel pellet concentrically arranged within a surrounding coated cover or shell by fiber nets imbedded within the cover material.

Holland, James R. (Butler, PA); Del Vecchio, Robert M. (Vandergrift, PA)

1987-01-01T23:59:59.000Z

262

Cryptographic Key Management System  

SciTech Connect

This report summarizes the outcome of U.S. Department of Energy (DOE) contract DE-OE0000543, requesting the design of a Cryptographic Key Management System (CKMS) for the secure management of cryptographic keys for the energy sector infrastructure. Prime contractor Sypris Electronics, in collaboration with Oak Ridge National Laboratories (ORNL), Electric Power Research Institute (EPRI), Valicore Technologies, and Purdue University's Center for Education and Research in Information Assurance and Security (CERIAS) and Smart Meter Integration Laboratory (SMIL), has designed, developed and evaluated the CKMS solution. We provide an overview of the project in Section 3, review the core contributions of all contractors in Section 4, and discuss bene#12;ts to the DOE in Section 5. In Section 6 we describe the technical construction of the CKMS solution, and review its key contributions in Section 6.9. Section 7 describes the evaluation and demonstration of the CKMS solution in different environments. We summarize the key project objectives in Section 8, list publications resulting from the project in Section 9, and conclude with a discussion on commercialization in Section 10 and future work in Section 11.

No, author

2014-02-21T23:59:59.000Z

263

Disentangling reaction mechanisms for ? production in the 6Li + 209Bi reaction  

Science Journals Connector (OSTI)

Inclusive breakup ? cross sections (??incl) are measured for the 6Li?+?209Bi reaction at bombarding energies Elab=24–50 MeV. The ??incl was observed to be a substantial fraction of the total reaction cross section over the entire energy range, and it exhausts almost whole of the reaction cross section at sub-barrier energies. An investigation on the origin of large inclusive ? reveals that most of the ? particles are produced by noncapture breakup (6Li??+d) and incomplete fusion via d capture. The combined cross sections of noncapture breakup, d capture, and transfer reactions successfully explain the origin of most of the experimental ??incl over the measured energy range. A comparison of the ??incl versus reduced energies for several targets involving 6Li as projectile shows that the cross sections are independent of target. Interestingly, the difference between reaction and complete fusion cross sections “?reac??CF” for several reactions also shows the same behavior.

S. Santra, S. Kailas, V. V. Parkar, K. Ramachandran, V. Jha, A. Chatterjee, P. K. Rath, and A. Parihari

2012-01-30T23:59:59.000Z

264

Annual Report of the EURATOM/CCFE Fusion Programme 2010/11 5 Tokamak Development  

E-Print Network (OSTI)

Annual Report of the EURATOM/CCFE Fusion Programme 2010/11 5.1 5 Tokamak Development 5 Tokamak Development 5.1 OVERVIEW The primary focus of the EURATOM/CCFE Fusion Association Tokamak Development programme is MAST, the Mega Amp Spherical Tokamak (Figure 5.1). A key feature of spherical tokamaks (STs

265

Annual Report of the EURATOM/UKAEA Fusion Programme 2007/08 7 Materials and Technology  

E-Print Network (OSTI)

, that hydrogen production by fusion would only be advantageous if very high temperature methods are used for DEMO designs have included options for hydrogen production. The analyses show that the widespread view and hydrogen generating ­ fusion plant are the key advantage. 7MaterialsandTechnology #12;Annual Report

266

Intelligent Sensor Validation and Fusion with distributed "MEMS Dust" Sensors Shijun Qiu*  

E-Print Network (OSTI)

Intelligent Sensor Validation and Fusion with distributed "MEMS Dust" Sensors (Abstract) Shijun Qiu, Berkeley aagogino@euler.berkeley.edu Key Words : sensor networks, sensor fusion, sensor validation, micro-electromechanical systems, MEMS MEMS sensors make a rich design space of networked sensors viable. They can be deeply

Agogino, Alice M.

267

Harnessing Nuclear Fusion  

Science Journals Connector (OSTI)

... as a source of energy, only the future will show. Meanwhile the control of nuclear fusion will be welcomed both as a great advance in science and as a factor of ...

1958-01-25T23:59:59.000Z

268

Nuclear Fusion Introduced  

Science Journals Connector (OSTI)

... introduce undergraduates to the present state of science, but it is difficult to see how Nuclear Fusion can be recommended to grammar school pupils or even to first-year undergraduates. The ...

DAPHNE F. JACKSON

1970-01-31T23:59:59.000Z

269

Fusion in Coq  

Science Journals Connector (OSTI)

Fusion theorem is a classical result that allows...10]. We present this theorem and some generalizations in the context of the constructive proof assistant tool Coq [2] where we have dependent types and parametri...

José L. Freire Nistal; José E. Freire Brańas…

2001-01-01T23:59:59.000Z

270

Spectral Label Fusion  

E-Print Network (OSTI)

We present a new segmentation approach that combines the strengths of label fusion and spectral clustering. The result is an atlas-based segmentation method guided by contour and texture cues in the test image. This offers ...

Wachinger, Christian

271

Photons & Fusion Newsletter - 2014  

NLE Websites -- All DOE Office Websites (Extended Search)

Photons & Fusion Newsletter - 2014 May NIF Petawatt Laser Is on the Fast Track to Completion First Isotope-Specific Radiograph Using MEGa-rays Produced NIF&PS Directorate Review...

272

Colliding Beam Fusion Reactors  

Science Journals Connector (OSTI)

The recirculating power for virtually all types of fusion reactors has previously been calculated [1] with the Fokker–Planck equation. The reactors involve non-Maxwellian plasmas. The calculations are ... the rec...

Norman Rostoker; Artan Qerushi; Michl Binderbauer

2003-06-01T23:59:59.000Z

273

Still Flying Fusion Edition  

E-Print Network (OSTI)

. ; The Fox Television Broadcasting Company ; 20th Century Fox Ltd. ; Fox Home Entertainment or Universal Pictures All rights are reserved and owned by the copyright holders as appropriate. Welcome to this very special Fusion Edition of Still.... This abridged edition is available only at Fusion, Issue Two will be available soon, complete with an Adam Baldwin interview! If you wish to subscribe (for free) please email stillflying@bitwiser.com with the subject heading "Subscribe" and you...

2013-11-27T23:59:59.000Z

274

Main achievements in research on Plasma Physics and Controlled Fusion in 2010 in Russia  

SciTech Connect

The key results presented at the XXXVIII International Zvenigorod Conference on Plasma Physics and Controlled Fusion, held February 14-18, 2011 are reviewed, and the main research directions are analyzed.

Grishina, I. A.; Ivanov, V. A.; Kovrizhnykh, L. M. [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)

2011-12-15T23:59:59.000Z

275

Film Boiling in Magnetic Field in Liquid Metals with Particular Reference to Fusion Reactor Project  

Science Journals Connector (OSTI)

Efficient heat removal at high temperatures is a key issue for blankets in nuclear fusion applications, for example, the EVOLVE (EVaporation...1], Wong et al. [2]). It utilizes the extremely high heat of vaporiza...

F. J. Arias

2010-04-01T23:59:59.000Z

276

The Temperature Control Mechanism of a Breeding Blanket Module for Fusion Reactor  

Science Journals Connector (OSTI)

The breeding blanket is one of the key tecnology bottlenecks for fusion reactor due to the tritium self-sufficiency issues....1]. In view of this, it will require a net tritium breeding ratio (TBR) ?1.05 for the ...

Chang-Le Liu; Jie Zhang; Hao Yang; Lei Li; Zhao-Liang Wang…

2014-08-01T23:59:59.000Z

277

I. Nuclear Production Reaction and Chemical Isolation Procedure for 240Am II. New Superheavy Element Isotopes: 242Pu(48Ca,5n)285-114  

E-Print Network (OSTI)

the low excitation energy of the nuclear reaction results inof nuclear fusion reactions at low excitation energies withlow (1 eV – 100 keV) neutron energies. It goes on to discuss the nuclear reactions

Ellison, Paul Andrew

2011-01-01T23:59:59.000Z

278

ITER Fusion Energy  

ScienceCinema (OSTI)

ITER (in Latin ?the way?) is designed to demonstrate the scientific and technological feasibility of fusion energy. Fusion is the process by which two light atomic nuclei combine to form a heavier over one and thus release energy. In the fusion process two isotopes of hydrogen ? deuterium and tritium ? fuse together to form a helium atom and a neutron. Thus fusion could provide large scale energy production without greenhouse effects; essentially limitless fuel would be available all over the world. The principal goals of ITER are to generate 500 megawatts of fusion power for periods of 300 to 500 seconds with a fusion power multiplication factor, Q, of at least 10. Q ? 10 (input power 50 MW / output power 500 MW). The ITER Organization was officially established in Cadarache, France, on 24 October 2007. The seven members engaged in the project ? China, the European Union, India, Japan, Korea, Russia and the United States ? represent more than half the world?s population. The costs for ITER are shared by the seven members. The cost for the construction will be approximately 5.5 billion Euros, a similar amount is foreseen for the twenty-year phase of operation and the subsequent decommissioning.

Dr. Norbert Holtkamp

2010-01-08T23:59:59.000Z

279

Application of deuteron-deuteron (d-d) fusion neutrons to 40 ar/39/ar geochronology  

E-Print Network (OSTI)

development of high-?ux D–D fusion reactors is a worthy goalfusion reaction 2 H(d,n) 3 He. A new generation of D–D reactors

Renne, P.; Knight, K.B.; Nomade, S.; Leung, K.-N.; Lou, T.P.

2005-01-01T23:59:59.000Z

280

AP Key Accomplishments  

NLE Websites -- All DOE Office Websites (Extended Search)

Recent Key Accomplishments Recent Key Accomplishments Reduction of Carbon Dioxide Mechanistic insight into CO2 hydrogenation Rapid Transfer of Hydride Ion from a Ruthenium Complex to C1 Species in Water Reversible Hydrogen Storage using CO2 and a Proton-Switchable Iridium Catalyst in Aqueous Media Nickel(II) Macrocycles: Highly Efficient Electrocatalysts for the Selective Reduction of CO2 to CO Calculation of Thermodynamic Hydricities and the Design of Hydride Donors for CO2 Reduction Mechanisms for CO Production from CO2 Using Re(bpy)(CO)3X Catalysts Hydrogen Production Biomass-derived electrocatalytic composites for hydrogen evolution Hydrogen-Evolution Catalysts Based on NiMo Nitride Nanosheets Water Oxidation Enabling light-driven water oxidation via a low-energy RuIV=O intermediate

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Key Assumptions Policy Issues  

E-Print Network (OSTI)

11/13/2014 1 Key Assumptions and Policy Issues RAAC Steering Committee November 17, 2014 Portland Supply Limitations 8 Withi h B l i8. Within-hour Balancing 9. Capacity and Energy Values for Wind/Solar t b it d d li d· Thermal: must be sited and licensed · Wind/solar: must be sited and licensed · EE

282

Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions {sup 233,238}U, {sup 242}Pu, and {sup 248}Cm+{sup 48}Ca  

SciTech Connect

We have studied the dependence of the production cross sections of the isotopes {sup 282,283}112 and {sup 286,287}114 on the excitation energy of the compound nuclei {sup 286}112 and {sup 290}114. The maximum cross section values of the xn-evaporation channels for the reaction {sup 238}U({sup 48}Ca,xn){sup 286-x}112 were measured to be {sigma}{sub 3n}=2.5{sub -1.1}{sup +1.8} pb and {sigma}{sub 4n}=0.6{sub -0.5}{sup +1.6} pb; for the reaction {sup 242}Pu({sup 48}Ca,xn){sup 290-x}114: {sigma}{sub 2n}{approx}0.5 pb, {sigma}{sub 3n}=3.6{sub -1.7}{sup +3.4} pb, and {sigma}{sub 4n}=4.5{sub -1.9}{sup +3.6} pb. In the reaction {sup 233}U({sup 48}Ca,2-4n){sup 277-279}112 at E*=34.9=2.2 MeV we measured an upper cross section limit of {sigma}{sub xn}{<=}0.6 pb. The observed shift of the excitation energy associated with the maximum sum evaporation residue cross section {sigma}{sub ER}(E*) to values significantly higher than that associated with the calculated Coulomb barrier can be caused by the orientation of the deformed target nucleus in the entrance channel of the reaction. An increase of {sigma}{sub ER} in the reactions of actinide targets with {sup 48}Ca is consistent with the expected increase of the survivability of the excited compound nucleus upon closer approach to the closed neutron shell N=184. In the present work we detected 33 decay chains arising in the decay of the known nuclei {sup 282}112, {sup 283}112, {sup 286}114, {sup 287}114, and {sup 288}114. In the decay of {sup 287}114({alpha}){yields}{sup 283}112({alpha}){yields}{sup 279}110(SF), in two cases out of 22, we observed decay chains of four and five sequential {alpha} transitions that end in spontaneous fission of {sup 271}Sg (T{sub {alpha}}{sub /SF}=2.4{sub -1.0}{sup +4.3} min) and {sup 267}Rf (T{sub SF}{approx}2.3 h), longer decay chains than reported previously. We observed the new nuclide {sup 292}116 (T{sub {alpha}}=18{sub -6}{sup +16} ms,E{sub {alpha}}=10.66{+-}0.07 MeV) in the irradiation of the {sup 248}Cm target at a higher energy than in previous experiments. The observed nuclear decay properties of the nuclides with Z=104-118 are compared with theoretical nuclear mass calculations and the systematic trends of spontaneous fission properties. As a whole, they give a consistent pattern of decay of the 18 even-Z neutron-rich nuclides with Z=104-118 and N=163-177. The experiments were performed with the heavy-ion beam delivered by the U400 cyclotron of the FLNR (JINR, Dubna) employing the Dubna gas-filled recoil separator.

Oganessian, Yu.Ts.; Utyonkov, V.K.; Lobanov, Yu.V.; Abdullin, F.Sh.; Polyakov, A.N.; Shirokovsky, I.V.; Tsyganov, Yu.S.; Gulbekian, G.G.; Bogomolov, S.L.; Gikal, B.N.; Mezentsev, A.N.; Iliev, S.; Subbotin, V.G.; Sukhov, A.M.; Voinov, A.A.; Buklanov, G.V.; Subotic, K.; Zagrebaev, V.I.; Itkis, M.G.; Patin, J.B. [Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States); Russian Federal Nuclear Center, All-Russian Research Institute of Experimental Physics, 607190 Sarov (Russian Federation)] [and others

2004-12-01T23:59:59.000Z

283

Key Activities | Department of Energy  

Energy Savers (EERE)

in several key areas to advance the development and commercialization of hydrogen and fuel cell technologies. Research, Development, and Demonstration Key areas of research,...

284

Unexpected results in neutron-rich radioactive beams induced fusion  

SciTech Connect

The fission-fragment beams at HRIBF provide a unique opportunity for studying the mechanisms of fusion involving nuclei with large neutron excess. To explore the role of transfer couplings, fusion excitation functions have been measured using neutron-rich radioactive $^{132}$Sn beams incident on $^{40}$Ca and $^{58}$Ni targets. The sub-barrier fusion enhancement for $^{132}$Sn+$^{40}$Ca is larger than that for $^{132}$Sn+$^{58}$Ni although the neutron transfer Q-values are similar for the two reactions. The fusion excitation function for $^{46}$Ti+$^{124}$Sn has been measured in an attempt to resolve the differences observed in $^{132}$Sn+$^{40}$Ca and $^{132}$Sn+$^{58}$Ni.

Liang, J Felix [ORNL] [ORNL

2013-01-01T23:59:59.000Z

285

A DISTRIBUTED SHARED KEY GENERATION PROCEDURE USING FRACTIONAL KEYS  

E-Print Network (OSTI)

A DISTRIBUTED SHARED KEY GENERATION PROCEDURE USING FRACTIONAL KEYS R. Poovendran, M. S. Corson, J}@isr.umd.edu ABSTRACT W e present a new class of distributed key generation and recovery algorithms suitable for group) with a Group Con- troller (GC) which can generate and distribute the keys. However, in these approaches

Baras, John S.

286

Laser-driven fusion etching process  

DOE Patents (OSTI)

The surfaces of solid ionic substrates are etched by a radiation-driven chemical reaction. The process involves exposing an ionic substrate coated with a layer of a reactant material on its surface to radiation, e.g. a laser, to induce localized melting of the substrate which results in the occurrance of a fusion reaction between the substrate and coating material. The resultant reaction product and excess reactant salt are then removed from the surface of the substrate with a solvent which is relatively inert towards the substrate. The laser-driven chemical etching process is especially suitable for etching ionic salt substrates, e.g., a solid inorganic salt such as LiNbO.sub.3, such as used in electro-optical/acousto-optic devices. It is also suitable for applications wherein the etching process is required to produce an etched ionic substrate having a smooth surface morphology or when a very rapid etching rate is desired.

Ashby, Carol I. H. (Edgewood, NM); Brannon, Paul J. (Albuquerque, NM); Gerardo, James B. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

287

Laser-driven fusion etching process  

DOE Patents (OSTI)

The surfaces of solids are etched by a radiation-driven chemical reaction. The process involves exposing a substrate coated with a layer of a reactant material on its surface to radiation, e.g., a laser, to induce localized melting of the substrate which results in the occurrence of a fusion reaction between the substrate and coating material. The resultant reaction product and excess reactant salt are then removed from the surface of the substrate with a solvent which is relatively inert towards the substrate. The laser-driven chemical etching process is especially suitable for etching ionic substrates, e.g., LiNbO/sub 3/, such as used in electro-optical/acousto-optic devices. It is also suitable for applications wherein the etching process is required to produce an etched ionic substrate having a smooth surface morphology or when a very rapid etching rate is desired.

Ashby, C.I.H.; Brannon, P.J.; Gerardo, J.B.

1987-08-25T23:59:59.000Z

288

Charged-particle cross section data for fusion plasma applications  

SciTech Connect

Cross-section data for fusion plasma calculations are reviewed for three categories: fusion reactions, nuclear elastic and inelastic scattering. While the data base for the basic D-T fuel cycle seems adequate for present purposes, continued refinement appears warranted. Further, increasing emphasis on advanced-fuel fusion introduces requirements for new reaction rate and charged-particle scattering data over a wider range of reacting species (light elements through /sup 11/B) and over a larger energy range (to several MeV). These new needs are discussed along with suggestions for increased emphasis on providing the user with more convenient compilations. In particular, the extension of reactivities (< sigma V) to non-Maxwellian distributions, scattering matrix data, and development of computer based files are noted.

Miley, G.H.

1980-01-01T23:59:59.000Z

289

Hydrodynamic Scaling Analysis of Nuclear Fusion in Hot Plasma  

E-Print Network (OSTI)

Proton beams generated by ultraintense laser pulse irradiations have potential applications in industry and in medicine. However, the laser pulse parameters are currently not optimized for practical applications. We discuss scaling laws of fusion yields generated by laser-plasma interactions. The yields are found to scale as a function of the laser power. The origin of the scaling law in the laser driven fusion yield is derived in terms of hydrodynamical scaling and it is attributed to the laser power dependence of three terms: the reaction rate, the density of the plasma and the pro- jected range of the plasma particle in the medium. The resulting scaling relations have a powerful predictive power that enables estimating the fusion yield for a nuclear reaction which has not been investigated by means of the laser accelerated ion beams.

Kimura, Sachie

2011-01-01T23:59:59.000Z

290

Cold fusion lab dies, but fusion research goes on  

Science Journals Connector (OSTI)

Cold fusion lab dies, but fusion research goes on ... that deuterium nuclei can fuse at or near room temperature inside a metal lattice to produce useful energy, is an idea that refuses to die, despite its rejection by mainstream scientists. ...

1991-07-01T23:59:59.000Z

291

IS C O N SIN FUSION TECHNOLOGY INSTITUTE  

E-Print Network (OSTI)

of Doctor of Philosophy (Nuclear Engineering & Engineering Physics) at the UNIVERSITY OF WISCONSIN concentric electrodes to accelerate fusion ions to high center of mass energies, allowing the use of the D charge exchange reactions occurring distributed throughout the vacuum chamber. The embedded regime

292

Key recycling in authentication  

E-Print Network (OSTI)

In their seminal work on authentication, Wegman and Carter propose that to authenticate multiple messages, it is sufficient to reuse the same hash function as long as each tag is encrypted with a one-time pad. They argue that because the one-time pad is perfectly hiding, the hash function used remains completely unknown to the adversary. Since their proof is not composable, we revisit it using a composable security framework. It turns out that the above argument is insufficient: if the adversary learns whether a corrupted message was accepted or rejected, information about the hash function is leaked, and after a bounded finite amount of rounds it is completely known. We show however that this leak is very small: Wegman and Carter's protocol is still $\\epsilon$-secure, if $\\epsilon$-almost strongly universal$_2$ hash functions are used. This implies that the secret key corresponding to the choice of hash function can be reused in the next round of authentication without any additional error than this $\\epsilon$. We also show that if the players have a mild form of synchronization, namely that the receiver knows when a message should be received, the key can be recycled for any arbitrary task, not only new rounds of authentication.

Christopher Portmann

2012-02-06T23:59:59.000Z

293

Neutronic analysis of a fusion hybrid reactor  

SciTech Connect

In a PHYSOR 2010 paper(1) we introduced a fusion hybrid reactor whose fusion component is the gasdynamic mirror (GDM), and whose blanket was made of thorium - 232. The thrust of that study was to demonstrate the performance of such a reactor by establishing the breeding of uranium - 233 in the blanket, and the burning thereof to produce power. In that analysis, we utilized the diffusion equation for one-energy neutron group, namely, those produced by the fusion reactions, to establish the power distribution and density in the system. Those results should be viewed as a first approximation since the high energy neutrons are not effective in inducing fission, but contribute primarily to the production of actinides. In the presence of a coolant, however, such as water, these neutrons tend to thermalize rather quickly, hence a better assessment of the reactor performance would require at least a two group analysis, namely the fast and thermal groups. We follow that approach and write an approximate set of equations for the fluxes of these groups. From these relations we deduce the all-important quantity, k{sub eff}, which we utilize to compute the multiplication factor, and subsequently, the power density in the reactor. We show that k{sub eff} can be made to have a value of 0.99, thus indicating that 100 thermal neutrons are generated per fusion neutron, while allowing the system to function as 'subcritical.' Moreover, we show that such a hybrid reactor can generate hundreds of megawatts of thermal power per cm of length depending on the flux of the fusion neutrons impinging on the blanket. (authors)

Kammash, T. [Univ. of Michigan, NERS, 2355 Bonisteel Blvd., Ann Arbor, MI 48109 (United States)

2012-07-01T23:59:59.000Z

294

Realization of Fusion Energy: An alternative fusion roadmap  

E-Print Network (OSTI)

Realization of Fusion Energy: An alternative fusion roadmap Farrokh Najmabadi Professor of Electrical & Computer Engineering Director, Center for Energy Research UC San Diego International Fusion Road of emerging nations, energy use is expected to grow ~ 4 fold in this century (average 1.6% annual growth rate

295

CRYOGENICS FOR FUSION  

SciTech Connect

Fusion of Hydrogen to produce energy is one of the technologies under study to meet the mankind raising need in energy and as a substitute to fossil fuels for the future. This technology is under investigation for more than 30 years already, with, for example, the former construction of the experimental reactors Tore Supra, DIII-D and JET. With the construction of ITER to start, the next step to 'fusion for energy' will be done. In these projects, an extensive use of cryogenic systems is requested. Air Liquide has been involved as cryogenic partner in most of former and presently constructed fusion reactors. In the present paper, a review of the cryogenic systems we delivered to Tore Supra, JET, IPR and KSTAR will be presented.

Dauguet, P.; Bonneton, M.; Fauve, E.; Bernhardt, J. M.; Beauvisage, J.; Andrieu, F. [Air Liquide Advanced Technology Division BP15, ZI Les Engenieres, 38360 Sassenage (France); Gistau-Baguer, G. M.; Boissin, J. C. [Consultants, Grenoble (France)

2008-03-16T23:59:59.000Z

296

Spherical torus fusion reactor  

DOE Patents (OSTI)

A fusion reactor is provided having a near spherical-shaped plasma with a modest central opening through which straight segments of toroidal field coils extend that carry electrical current for generating a toroidal magnet plasma confinement fields. By retaining only the indispensable components inboard of the plasma torus, principally the cooled toroidal field conductors and in some cases a vacuum containment vessel wall, the fusion reactor features an exceptionally small aspect ratio (typically about 1.5), a naturally elongated plasma cross section without extensive field shaping, requires low strength magnetic containment fields, small size and high beta. These features combine to produce a spherical torus plasma in a unique physics regime which permits compact fusion at low field and modest cost.

Peng, Yueng-Kay M. (Oak Ridge, TN)

1989-01-01T23:59:59.000Z

297

Ceramics for fusion devices  

SciTech Connect

Ceramics are required for a number of applications in fusion devices, among the most critical of which are magnetic coil insulators, windows for RF heating systems, and structural uses. Radiation effects dominate consideration of candidate materials, although good pre-irradiation properties are a requisite. Materials and components can be optimized by careful control of chemical and microstructural content, and application of brittle material design and testing techniques. Future directions for research and development should include further extension of the data base in the areas of electrical, structural, and thermal properties; establishment of a fission neutron/fusion neutron correlation including transmutation gas effects; and development of new materials tailored to meet the specific needs of fusion reactors.

Clinard, F.W. Jr.

1984-01-01T23:59:59.000Z

298

Ceramics for fusion applications  

SciTech Connect

Ceramics are required for a variety of uses in both near-term fusion devices and in commercial powerplants. These materials must retain adequate structural and electrical properties under conditions of neutron, particle, and ionizing irradiation; thermal and applied stresses; and physical and chemical sputtering. Ceramics such as Al/sub 2/O/sub 3/, MgAl/sub 2/O/sub 4/, BeO, Si/sub 3/N/sub 4/ and SiC are currently under study for fusion applications, and results to date show widely-varying response to the fusion environment. Materials can be identified today which will meet initial operating requirements, but improvements in physical properties are needed to achieve satisfactory lifetimes for critical applications.

Clinard, F.W. Jr.

1986-01-01T23:59:59.000Z

299

Deflagration-to-detonation transition in inertial-confinement-fusion baseline targets  

Science Journals Connector (OSTI)

By means of highly resolved one-dimensional hydrodynamics simulations, we provide an understanding of the burn process in inertial-confinement-fusion baseline targets. The cornerstone of the phenomenology of propagating burn in such laser-driven capsules is shown to be the transition from a slow unsteady reaction-diffusion regime of thermonuclear combustion (some sort of deflagration) to a fast detonative one. Remarkably, detonation initiation follows the slowing down of a shockless supersonic reaction wave driven by energy redeposition from the fusion products themselves. Such a route to detonation is specific to fusion plasmas.

P. Gauthier; F. Chaland; L. Masse

2004-11-11T23:59:59.000Z

300

Cross section for nuclear fusion  

Science Journals Connector (OSTI)

... gamma rays. In recent years there have been many studies of the cross section for nuclear fusion, and some features of the process are now understood (Nature, 256, 261; ... velocities fusion cannot take place at all.

P. E. Hodgson

1976-05-20T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Cell Fusion and Tissue Regeneration  

Science Journals Connector (OSTI)

Cell fusion is a natural process implicated in normal ... bone marrow stem cells fuse with several cell types, under normal condition or after an injury ... in regenerative medicine and genetic repair. Cell fusion

Manuel Álvarez-Dolado; Magdalena Martínez-Losa

2011-01-01T23:59:59.000Z

302

The spectrum of splenogonadal fusion  

Science Journals Connector (OSTI)

Splenogonadal fusion is a rare congenital malformation in which there is an abnormal fusion between the spleen and the gonad or ... more frequently in males. There are two types of this malformation: the continuo...

A. S. H. Gouw; J. D. Elema; M. Th. E. Bink-Boelkens…

1985-11-01T23:59:59.000Z

303

Scientists Report Results on Fusion  

Science Journals Connector (OSTI)

Scientists Report Results on Fusion ... Steady progress points to several feasible controls for thermonuclear "fire" ... American scientists trying to control thermonuclear fusion have summed up the results of their work of the past two years. ...

1960-04-04T23:59:59.000Z

304

Structural materials for fusion reactors  

Science Journals Connector (OSTI)

Fusion Reactors will require specially engineered structural materials, which ... on safety considerations. The fundamental differences between fusion and other nuclear reactors arise due to the 14MeV neutronics ...

P. M. Raole; S. P. Deshpande

2009-04-01T23:59:59.000Z

305

Fusion welding process  

DOE Patents (OSTI)

A process for the fusion welding of nickel alloy steel members wherein a ferrite containing pellet is inserted into a cavity in one member and melted by a welding torch. The resulting weld nugget, a fusion of the nickel containing alloy from the members to be welded and the pellet, has a composition which is sufficiently low in nickel content such that ferrite phases occur within the weld nugget, resulting in improved weld properties. The steel alloys encompassed also include alloys containing carbon and manganese, considered nickel equivalents.

Thomas, Kenneth C. (Export, PA); Jones, Eric D. (Salem, PA); McBride, Marvin A. (Hempfield Township, Westmoreland County, PA)

1983-01-01T23:59:59.000Z

306

Prospects for spheromak fusion reactors  

Science Journals Connector (OSTI)

The reactor study of Hagenson and Krakowski demonstrated the attractiveness of the spheromak as a compact fusion reactor, based on...

T. K. Fowler; D. D. Hua

1995-06-01T23:59:59.000Z

307

Neutron capture in laser-fusion pellets  

Science Journals Connector (OSTI)

Investigating the feasibility of obtaining slow neutron fluencies sufficient for multiple-capture nucleosynthesis, we have applied a Monte Carlo technique to determine the moderation of neutrons in a superdense laser-energized fusion pellet. We studied pellets of varying chemical composition and structure ranging in size from ?R?1 to 50 g/cm2 and found our results to be rather insensitive to the parametrization of the hydrodynamic motion. That is, the neutron spectra were largely unaffected by reasonable variations of peak density, time of disassembly, and shape of the density profile. A useful method of improving the ratio of moderated to unmoderated neutrons was to dilute the thermonuclear fuel with hydrogen and/or the addition of a beryllium reflector. We also calculated the ratio of fission, neutron capture, and (n, p) reactions in pellets seeded with traces of U238 target material.NUCLEAR REACTIONS Calculated neutron fluxes and neutron-nucleus reactions for parametrized thermonuclear explosions of H2H3 and H2H2 laser-fusion pellets with moderators and target material.

John Henley and Heiner W. Meldner

1975-08-01T23:59:59.000Z

308

Human-Centered Fusion Framework  

SciTech Connect

In recent years the benefits of fusing signatures extracted from large amounts of distributed and/or heterogeneous data sources have been largely documented in various problems ranging from biological protein function prediction to cyberspace monitoring. In spite of significant progress in information fusion research, there is still no formal theoretical framework for defining various types of information fusion systems, defining and analyzing relations among such types, and designing information fusion systems using a formal method approach. Consequently, fusion systems are often poorly understood, are less than optimal, and/or do not suit user needs. To start addressing these issues, we outline a formal humancentered fusion framework for reasoning about fusion strategies. Our approach relies on a new taxonomy for fusion strategies, an alternative definition of information fusion in terms of parameterized paths in signature related spaces, an algorithmic formalization of fusion strategies and a library of numeric and dynamic visual tools measuring the impact as well as the impact behavior of fusion strategies. Using a real case of intelligence analysis we demonstrate that the proposed framework enables end users to rapidly 1) develop and implement alternative fusion strategies, 2) understand the impact of each strategy, 3) compare the various strategies, and 4) perform the above steps without having to know the mathematical foundations of the framework. We also demonstrate that the human impact on a fusion system is critical in the sense that small changes in strategies do not necessarily correspond to small changes in results.

Posse, Christian; White, Amanda M.; Beagley, Nathaniel

2007-05-16T23:59:59.000Z

309

Fusion of Isolated Plant Protoplasts  

Science Journals Connector (OSTI)

... Protoplasts have been seen to fuse before2,3, but in ill-defined conditions, and fusions were rare and non-reproducible4. In these cases protoplasts were freed from their walls ... kinds, and these conditions indicated some of the factors that affect the likelihood of protoplast fusion. For example, the presence of sucrose in the solution apparently inhibited fusion2, while ...

J. B. POWER; S. E. CUMMINS; E. C. COCKING

1970-03-14T23:59:59.000Z

310

Fusion systems for profinite groups  

Science Journals Connector (OSTI)

......April 2014 research-article Articles Fusion systems for profinite groups Radu Stancu...paper. We introduce the notion of a pro-fusion system on a pro- group, which generalizes the notion of a fusion system on a finite -group. We also prove......

Radu Stancu; Peter Symonds

2014-04-01T23:59:59.000Z

311

The Fusion Machine (extended abstract)  

E-Print Network (OSTI)

The Fusion Machine (extended abstract) Philippa Gardner Cosimo Laneve Lucian Wischik March 27, 2002. In particular, we describe a dis- tributed abstract machine called the fusion machine. In it, only channels exist at runtime. It uses a form of concurrent constraints called fusions--equations on channel names

Gardner, Philippa

312

Observed Multi-Decade DD and DT Z-Pinch Fusion Rate Scaling in 5 Dense Plasma Focus Fusion Machines  

SciTech Connect

Dense Plasma Focus (DPF) machines are in use worldwide or a wide variety of applications; one of these is to produce intense, short bursts of fusion via r-Z pinch heating and compression of a working gas. We have designed and constructed a series of these, ranging from portable to a maximum energy storage capacity of 2 MJ. Fusion rates from 5 DPF pulsed fusion generators have been measured in a single laboratory using calibrated activation detectors. Measured rates range from ~ 1015 to more than 1019 fusions per second have been measured. Fusion rates from the intense short (20 – 50 ns) periods of production were inferred from measurement of neutron production using both calibrated activation detectors and scintillator-PMT neutron time of flight (NTOF) detectors. The NTOF detectors are arranged to measure neutrons versus time over flight paths of 30 Meters. Fusion rate scaling versus energy and current will be discussed. Data showing observed fusion cutoff at D-D fusion yield levels of approximately 1?1012, and corresponding tube currents of ~ 3 MA will be shown. Energy asymmetry of product neutrons will also be discussed. Data from the NTOF lines of sight have been used to measure energy asymmetries of the fusion neutrons. From this, center of mass energies for the D(d,n)3He reaction are inferred. A novel re-entrant chamber that allows extremely high single pulse neutron doses (> 109 neutrons/cm2 in 50 ns) to be supplied to samples will be described. Machine characteristics and detector types will be discussed.

Hagen, E. C. [National Security Technologies, LLC; Lowe, D. R. [National Security Technologies, LLC; O'Brien, R. [University of Nevada, Las Vegas; Meehan, B. T. [National Security Technologies, LLC

2013-06-18T23:59:59.000Z

313

Control of Fusion and Solubility in Fusion Systems David A. Craven  

E-Print Network (OSTI)

Control of Fusion and Solubility in Fusion Systems David A. Craven March 2009 Abstract In this article, we consider control of fusion, quotients, and p-soluble fusion systems. For control of fusion, we for fusion systems. We move on to p-soluble fusion systems, and prove that they are constrained, allowing us

Craven, David A.

314

Fusion Chamber Technology Publications  

E-Print Network (OSTI)

, Z. "Thermal and Mechanical Properties of Ceramic Blanket Particle Bed Materials: Numerical Nonconforming Beryllium and Type 316 Stainless Steel Surfaces Subjected to Nonuniform Thermal Deformations.N. Sviatoslavsky, M.L. Corradini, and S. Malang, "EVOLVE Lithium Tray Thermal-Hydraulic Analysis," Fusion

California at Los Angeles, University of

315

High Current Ion Sources and Injectors for Heavy Ion Fusion  

E-Print Network (OSTI)

on Heavy Ion Inertial Fusion; Fusion Engineering and Design,Ion Inertial Fusion, Princeton, New Jersey, Sept. 6-9, 1995; in Fusion EngineeringIon Inertial Fusion, Princeton, New Jersey, Sept. 6-9, 1995; in Fusion Engineering

Kwan, Joe W.

2005-01-01T23:59:59.000Z

316

Nuclear fusion in muonic molecules and in deuterated metals  

E-Print Network (OSTI)

Study of the fusion reactions between hydrogen isotopes in muonic molecules is the first example of the accurate accounting of the nucleus charge screening by a muon in the fusion process. At LUNA installation the measurements of astrophysical reaction cross sections were extended down to collision energies of a few keV. The screening by atomic electrons of the target became substantial. The possibility to look over screening from unbound electrons is given by metal-hydrides used as targets in dd reaction measurements. The classical Debye screening in plasma, applied to quasi-free electrons in metal, provides an explanation of unexpectedly large screening potentials found for some metals in the research through the Periodic table of elements.

L. N. Bogdanova

2008-04-24T23:59:59.000Z

317

Isospin dependence of reactions $^{48}$Ca+$^{243-251}$Bk  

E-Print Network (OSTI)

The fusion process of $^{48}$Ca induced reactions is studied with the two-step model. In this model, the fusion process is devided into two stages: first, the sticking stage where projectile and target come to the touching point over the Coulomb barrier from infinite distance, and second, the formation stage where the di-nucleus formed with projectile and target evolve to form the spherical compound nucleus from the touching point. By the use of the statistical evaporation model, the residue cross sections for different neutron evaporation channels are analyzed. From the results, optimum reactions are given to synthesize $Z$ = 117 element with $^{48}$Ca induced reactions.

Caiwan Shen; Yasuhisa Abe; Davoid Boilley; Grigory Kosenko; Enguang Zhao

2008-09-13T23:59:59.000Z

318

Magnetized Target Fusion Collaboration. Final report  

SciTech Connect

Nuclear fusion has the potential to satisfy the prodigious power that the world will demand in the future, but it has yet to be harnessed as a practical energy source. The entry of fusion as a viable, competitive source of power has been stymied by the challenge of finding an economical way to provide for the confinement and heating of the plasma fuel. It is the contention here that a simpler path to fusion can be achieved by creating fusion conditions in a different regime at small scale (~ a few cm). One such program now under study, referred to as Magnetized Target Fusion (MTF), is directed at obtaining fusion in this high energy density regime by rapidly compressing a compact toroidal plasmoid commonly referred to as a Field Reversed Configuration (FRC). To make fusion practical at this smaller scale, an efficient method for compressing the FRC to fusion gain conditions is required. In one variant of MTF a conducting metal shell is imploded electrically. This radially compresses and heats the FRC plasmoid to fusion conditions. The closed magnetic field in the target plasmoid suppresses the thermal transport to the confining shell, thus lowering the imploding power needed to compress the target. The undertaking described in this report was to provide a suitable target FRC, as well as a simple and robust method for inserting and stopping the FRC within the imploding liner. The FRC must also survive during the time it takes for the metal liner to compress the FRC target. The initial work at the UW was focused on developing adequate preionization and flux trapping that were found to be essential in past experiments for obtaining the density, flux and most critically, FRC lifetime required for MTF. The timescale for testing and development of such a source can be rapidly accelerated by taking advantage of a new facility funded by the Department of Energy. At this facility, two inductive plasma accelerators (IPA) were constructed and tested. Recent experiments with these IPAs have demonstrated the ability to rapidly form, accelerate and merge two hypervelocity FRCs into a compression chamber. The resultant FRC that was formed was hot (T{sub ion} ~ 400 eV), stationary, and stable with a configuration lifetime several times that necessary for the MTF liner experiments. The accelerator length was less than 1 meter, and the time from the initiation of formation to the establishment of the final equilibrium was less than 10 microseconds. With some modification, each accelerator can be made capable of producing FRCs suitable for the production of the target plasma for the MTF liner experiment. Based on the initial FRC merging/compression results, the design and methodology for an experimental realization of the target plasma for the MTF liner experiment can now be defined. The construction and testing of the key components for the formation of the target plasma at the Air Force Research Laboratory (AFRL) will be performed on the IPA experiment, now at MSNW. A high density FRC plasmoid will be formed and accelerated out of each IPA into a merging/compression chamber similar to the imploding liner at AFRL. The properties of the resultant FRC plasma (size, temperature, density, flux, lifetime) will be obtained. The process will be optimized, and a final design for implementation at AFRL will be carried out. When implemented at AFRL it is anticipated that the colliding/merging FRCs will then be compressed by the liner. In this manner it is hoped that ultimately a plasma with ion temperatures reaching the 10 keV range and fusion gain near unity can be obtained.

John Slough

2012-04-18T23:59:59.000Z

319

Advanced Fusion Reactors for Space Propulsion and Power Systems  

SciTech Connect

In recent years the methodology proposed for conversion of light elements into energy via fusion has made steady progress. Scientific studies and engineering efforts in advanced fusion systems designs have introduced some new concepts with unique aspects including consideration of Aneutronic fuels. The plant parameters for harnessing aneutronic fusion appear more exigent than those required for the conventional fusion fuel cycle. However aneutronic fusion propulsion plants for Space deployment will ultimately offer the possibility of enhanced performance from nuclear gain as compared to existing ionic engines as well as providing a clean solution to Planetary Protection considerations and requirements. Proton triggered 11Boron fuel (p- 11B) will produce abundant ion kinetic energy for In-Space vectored thrust. Thus energetic alpha particles' exhaust momentum can be used directly to produce high Isp thrust and also offer possibility of power conversion into electricity. p-11B is an advanced fusion plant fuel with well understood reaction kinematics but will require some new conceptual thinking as to the most effective implementation.

Chapman, John J.

2011-06-15T23:59:59.000Z

320

Macroscopic/microscopic simulation of nuclear reactions at intermediate energies. Denis Lacroix, Aymeric Van Lauwe and Dominique Durand  

E-Print Network (OSTI)

for reactions close to the fusion barrier (5-10 MeV/A) up to higher energy (100 MeV/A) and it gives access) -coalescence -test of fusion (FSI) -energy balance -classical propagation -in-flight emission Figure 1 to understand nuclear reactions at inter- mediate energies. These models provide gener- ally a rather good

Boyer, Edmond

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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321

Progress of Theoretical Physics Supplement No. 154, 2004 325 The Stopping of Low Energy Ions in Reactions  

E-Print Network (OSTI)

molecular orbital wavefunctions. At low projectile energies the stopping is mainly due to nuclear stopping of fusion reactions.3),4) It is well known that the laboratory measurements of low energy fusion reactionsProgress of Theoretical Physics Supplement No. 154, 2004 325 The Stopping of Low Energy Ions

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

322

Laser Inertial Fusion Energy Control Systems  

SciTech Connect

A Laser Inertial Fusion Energy (LIFE) facility point design is being developed at LLNL to support an Inertial Confinement Fusion (ICF) based energy concept. This will build upon the technical foundation of the National Ignition Facility (NIF), the world's largest and most energetic laser system. NIF is designed to compress fusion targets to conditions required for thermonuclear burn. The LIFE control systems will have an architecture partitioned by sub-systems and distributed among over 1000's of front-end processors, embedded controllers and supervisory servers. LIFE's automated control subsystems will require interoperation between different languages and target architectures. Much of the control system will be embedded into the subsystem with well defined interface and performance requirements to the supervisory control layer. An automation framework will be used to orchestrate and automate start-up and shut-down as well as steady state operation. The LIFE control system will be a high parallel segmented architecture. For example, the laser system consists of 384 identical laser beamlines in a 'box'. The control system will mirror this architectural replication for each beamline with straightforward high-level interface for control and status monitoring. Key technical challenges will be discussed such as the injected target tracking and laser pointing feedback. This talk discusses the the plan for controls and information systems to support LIFE.

Marshall, C; Carey, R; Demaret, R; Edwards, O; Lagin, L; Van Arsdall, P

2011-03-18T23:59:59.000Z

323

Cooling Fusion in a Flash | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

Cooling Fusion in a Flash American Fusion News Category: U.S. Universities Link: Cooling Fusion in a Flash...

324

Data Fusion Framework: concurrent architecture for real-time processing  

Science Journals Connector (OSTI)

In the last few decades, a new way of interpreting multi-sensor array processing techniques and artificial intelligence systems has been introduced. This theory focuses on interactions and fusion between heterogeneous/homogeneous information at different layers in order to guarantee data completeness and robust resolution of hard-to-solve problems. Our research investigates this theory, well known as Data Fusion (DF). In this paper, we present an operating framework that permits DF during the elaboration flow at different levels of computation. We focused our attention on several key aspects of real-time implementation.

Stefano Laoreti; Davide Renzi; Raffaele Parisi; Aurelio Uncini

2008-01-01T23:59:59.000Z

325

Nuclear reactions  

Science Journals Connector (OSTI)

Much reference has been made in the last chapter to nuclear energy levels and their various properties (e.g ... ways of doing this — the use of nuclear reactions, and studies of how excited nuclei...

R. J. Blin-Stoyle FRS

1991-01-01T23:59:59.000Z

326

Does neutron transfer with positive Q-values enhance sub-barrier fusion cross section?  

E-Print Network (OSTI)

[Background] Significant enhancement of sub-barrier fusion cross sections owing to neutron rearrangement with positive $Q$-values were found for many combinations of colliding nuclei. However several experimental results on fusion reactions were reported recently in which such enhancement has not been observed in spite of a possibility for neutron rearrangement with positive $Q$-values. [Purpose] We aim to clarify much better the mechanism of neutron rearrangement in sub-barrier fusion reactions to find the other requirements (beside positive $Q$-value) which favour (or prevent) sub-barrier fusion enhancement. [Method] Channel coupling approach along with the semi-classical model for neutron transfer have been used for analysis of available experimental data. [Results] (1) Only 1n and 2n transfers with positive $Q$-values have a noticeable impact on sub-barrier fusion. Positive $Q$-value for neutron rearrangement is necessary but not sufficient requirement for additional sub-barrier fusion enhancement takes place. (2) "Rigidity" of colliding nuclei in respect of collective excitations is important that the sub-barrier fusion enhancement due to neutron rearrangement with positive $Q$-value be clearly visible. (3) Neutron binding energy in "donor" nucleus has a strong impact only in the case of fusion of light weakly bound nuclei.

V. A. Rachkov; A. V. Karpov; A. S. Denikin; V. I. Zagrebaev

2014-06-17T23:59:59.000Z

327

Perspective on the Role of Negative Ions and Ion-Ion Plasmas in Heavy Ion Fusion Science, Magnetic Fusion Energy, and Related Fields  

E-Print Network (OSTI)

in Heavy Ion Fusion Science, Magnetic Fusion Energy, andin Heavy Ion Fusion Science, Magnetic Fusion Energy, and

Kwan, J.W.

2008-01-01T23:59:59.000Z

328

Fusion pumped laser  

DOE Patents (OSTI)

The apparatus of this invention may comprise a system for generating laser radiation from a high-energy neutron source. The neutron source is a tokamak fusion reactor generating a long pulse of high-energy neutrons and having a temperature and magnetic field effective to generate a neutron flux of at least 10/sup 15/ neutrons/cm/sup 2//center dot/s. Conversion means are provided adjacent the fusion reactor at a location operable for converting the high-energy neutrons to an energy source with an intensity and energy effective to excite a preselected lasing medium. A lasing medium is spaced about and responsive to the energy source to generate a population inversion effective to support laser oscillations for generating output radiation. 2 figs., 2 tabs.

Pappas, D.S.

1987-07-31T23:59:59.000Z

329

Modular Aneutronic Fusion Engine  

SciTech Connect

NASA's JUNO mission will arrive at Jupiter in July 2016, after nearly five years in space. Since operational costs tend to rise with mission time, minimizing such times becomes a top priority. We present the conceptual design for a 10MW aneutronic fusion engine with high exhaust velocities that would reduce transit time for a Jupiter mission to eighteen months and enable more challenging exploration missions in the solar system and beyond. __________________________________________________

Gary Pajer, Yosef Razin, Michael Paluszek, A.H. Glasser and Samuel Cohen

2012-05-11T23:59:59.000Z

330

Fusion of Nonionic Vesicles  

Science Journals Connector (OSTI)

The data are qualitatively consistent with that the vesicles on the average are becoming larger, and at the same time more polydisperse, which is exactly what we expect if the vesicles are fusing into larger ones. ... Then, the two inner monolayers get in contact, and if they also fuse the result is a fusion pore, which then widens as the new larger vesicle obtains its spherical shape. ...

Sanja Bulut; Malin Zackrisson Oskolkova; Ralf Schweins; Ha?kan Wennerstro?m; Ulf Olsson

2009-12-30T23:59:59.000Z

331

T-661: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important Update T-661: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important Update July 5, 2011 - 7:57am Addthis...

332

COLLABORATIVE: FUSION SIMULATION PROGRAM  

SciTech Connect

New York University, Courant Institute of Mathematical Sciences, participated in the ���¢��������Fusion Simulation Program (FSP) Planning Activities���¢������� [http://www.pppl.gov/fsp], with C.S. Chang as the institutional PI. FSP���¢��������s mission was to enable scientific discovery of important new plasma phenomena with associated understanding that emerges only upon integration. This requires developing a predictive integrated simulation capability for magnetically-confined fusion plasmas that are properly validated against experiments in regimes relevant for producing practical fusion energy. Specific institutional goal of the New York University was to participate in the planning of the edge integrated simulation, with emphasis on the usage of large scale HPCs, in connection with the SciDAC CPES project which the PI was leading. New York University successfully completed its mission by participating in the various planning activities, including the edge physics integration, the edge science drivers, and the mathematical verification. The activity resulted in the combined report that can be found in http://www.pppl.gov/fsp/Overview.html. Participation and presentations as part of this project are listed in a separation file.

Chang, Choong Seock

2012-06-05T23:59:59.000Z

333

Life Pure Fusion Target Designs: Status and Prospects  

SciTech Connect

Analysis and radiation-hydrodynamics simulations for expected high-gain fusion target performance on a demonstration 1-GWe Laser Inertial Fusion Energy (LIFE) power plant are presented. The required laser energy driver is 2.2 MJ at a 0.351-{mu}m wavelength, and a fusion target gain greater than 60 at a repetition rate of 16 Hz is the design goal for economic and commercial attractiveness. A scaling-law analysis is developed to benchmark the design parameter space for hohlraum-driven central hot-spot ignition. A suite of integrated hohlraum simulations is presented to test the modeling assumptions and provide a basis for near-term experimental resolution of the key physics uncertainties on the National Ignition Facility.

Amendt, P; Dunne, M; Ho, D; Lindl, J

2011-10-20T23:59:59.000Z

334

Findings of the US research needs workshop on the topic of fusion power  

SciTech Connect

The US Department of Energy, Office of Fusion Energy Sciences (OFES) conducted a Research Needs Workshop, referred to as ReNeW, in June 2009. The information developed at this workshop will help OFES develop a plan for US fusion research during the ITER era, roughly the next two decades. The workshop was organized in five Themes, one of which was Harnessing Fusion Power (or Fusion Power for short). The top level goal of the Fusion Power Theme was to identify the research needed to develop the knowledge to design and build, with high confidence, robust and reliable systems that can convert fusion products to useful forms of energy in a reactor environment, including a self-sufficient supply of tritium fuel. Each Theme was subsequently subdivided into Panels to address specific topics. The Fusion Power Panel topics were: Fusion Fuel Cycle; Power Extraction; Materials Science; Safety and Environment; and Reliability, Availability, Maintainability and Inspectability (RAMI). Here we present the key findings of the Fusion Power Theme.

W. R. Meier; A. R. Raffray; R. J. Kurtz; N. B. Morley; W. T. Reiersen; Phil Sharpe; S. Willms

2010-12-01T23:59:59.000Z

335

Findings of the US research needs workshop on the topic of fusion power  

SciTech Connect

The US Department of Energy, Of?ce of Fusion Energy Sciences (OFES) conducted a Research Needs Workshop, referred to as ReNeW, in June 2009. The information developed at this workshop will help OFES develop a plan for US fusion research during the ITER era, roughly the next two decades. The workshop was organized in ?ve Themes, one of which was Harnessing Fusion Power (or Fusion Power for short). The top level goal of the Fusion Power Theme was to identify the research needed to develop the knowledge to design and build, with high con?dence, robust and reliable systems that can convert fusion products to useful forms of energy in a reactor environment, including a self-suf?cient supply of tritium fuel. Each Theme was subsequently subdivided into Panels to address speci?c topics. The Fusion Power Panel topics were: Fusion Fuel Cycle; Power Extraction; Materials Science; Safety and Environment; and Reliability, Availability, Maintainability and Inspectability (RAMI). Here we present the key ?ndings of the Fusion Power Theme.

Meier, Wayne R.; Raffray, R.; Kurtz, Richard J.; Morley, Neil B.; Reiersen, Wayne T.; Sharpe, Phil; Willms, Scott

2010-12-01T23:59:59.000Z

336

Fast track to fusion energy  

Science Journals Connector (OSTI)

... Nuclear fusion powers our Sun, the stars and ... powers our Sun, the stars and thermonuclear weapons, so what's stopping it being used as an energy source? The answer ...

Michael H. Key

2001-08-23T23:59:59.000Z

337

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Magnetic Confinement Fusion Magnetic Confinement Fusion FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement Fusion by Magnetic Confinement The image above is an artistic rendering of a tokamak, a donut-shaped magnetic vacuum chamber in which wispy vapors of fusion fuel are

338

NUCLEAR STRUCTURE AND HEAVY-ION FUSION  

E-Print Network (OSTI)

will cover three types of experiments on the fusion of heavyconsidered are of three types. The fusion fusion of lighterfusion cross sections, and give us a familiarity with the type

Stokstad, R.G.

2010-01-01T23:59:59.000Z

339

Cytoplasmic Fusion and the Nature of Sexes  

Science Journals Connector (OSTI)

...that: (i) in systems with fusion of gametes, the mating type genes are typically binary...independently associated with fusion, although at least twice binary types have been lost, associated with a loss of fusion; further, in accordance...

1992-01-01T23:59:59.000Z

340

RAPPORTEUR TALK FOR IAEA FUSION MEETING, BRUSSELS  

E-Print Network (OSTI)

Ion Fusion Papers: The Argonne Heavy Ion Fusion Program:to the target. 3. The Argonne Heavy Ion Fusion Program:ring system developed at Argonne National Laboratory shows

Watson, J.M.

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

NUCLEAR STRUCTURE AND HEAVY-ION FUSION  

E-Print Network (OSTI)

Nuclear Structure and Heavy-Ton Fusion* A series of lecturesthe cross section for fusion in the experiments consideredEffects g in III. Subharrier Fusion Cross Sections for Light

Stokstad, R.G.

2010-01-01T23:59:59.000Z

342

INL Fusion Safety Program - Past Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

Significant publications from the INL Fusion Safety Program D. A. Petti and K. A. McCarthy, "Progress in US fusion safety and environmental activities over the last decade," Fusion...

343

Status and problems of fusion reactor development  

Science Journals Connector (OSTI)

Thermonuclear fusion of deuterium and tritium constitutes an enormous ... inexhaustible. Further, the safety prospects of a fusion reactor are quite favourable due to the inherently self-limiting fusion process,...

Uwe Schumacher

2001-03-01T23:59:59.000Z

344

Scientists meet to chart roadmap to fusion | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

Scientists meet to chart roadmap to fusion Scientists meet to chart roadmap to fusion By John Greenwald October 12, 2012 Tweet Widget Facebook Like Google Plus One The crucial next steps on the roadmap to developing fusion energy will be the focus of more than 70 top fusion scientists and engineers from around the world who will gather at the University of California-Los Angeles (UCLA) this month. The Oct. 15-18 session will kick off a series of annual workshops under the auspices of the International Atomic Energy Agency (IAEA) that will address key scientific and technological challenges facing countries developing fusion as a source of clean and abundant energy for producing electricity. "There's nothing like face-to-face talk and presentations to help people resolve common challenges," said Hutch Neilson, who directs advanced

345

Imaging of fusion reaction zone in plasma focus  

Science Journals Connector (OSTI)

In a low energy (2.3 kJ) Mather-type deuterium plasma focus neutron and charged particle emission is investigated by using time-resolved neutrondetectors and time-integrated charged particle pinhole imaging camera. The time-integrated charged particle pinhole images demonstrate the varying influence of magnetohydrodynamic(MHD)instabilities vis-a-vis filling pressure. The neutron production mechanism at play strongly depends upon the pressure. At lower pressure the plasma column is highly unstable due to MHDinstabilities and the neutron emission is found to be low with fluence anisotropy exceeding 3.5. At optimum pressure (2.5 mbar for this system) an almost stable dense plasma of about 17 mm3 volume is formed about 5 mm away from the anode with neutron emission at its highest and the fluence anisotropy lowest. At higher pressure the plasma column is stable although it moves away from the anode like a jet and may then be called a moving boiler. In this case the neutron emission is lowered compared to its optimum value and fluence anisotropy is increased. The data suggest beam-target mechanism at low pressure trapped gyrating particles at optimum pressure and a jetlike moving boiler at higher pressure.

M. Zakaullah; Ijaz Akhtar; G. Murtaza; A. Waheed

1999-01-01T23:59:59.000Z

346

Fusion Electricity A roadmap to the realisation of fusion energy  

E-Print Network (OSTI)

Fusion Electricity A roadmap to the realisation of fusion energy #12;28 European countries signed association EURaToM ­ University of latvia LATVIA lithuanian Energy Institute LITHUANIA Ministry of Education and Research ROMANIA Ministry of Education, science, culture and sport SLOVENIA centro de Investigaciones

347

Z-Pinch Inertial Fusion Energy Fusion Power Associates Annual  

E-Print Network (OSTI)

@sandia.gov) LTD Cavity Recyclable Transmission Line Hohlraum #12;2 Outline · Refurbished Z · Pulsed power fusion 82 kV #12;7 Outline · Refurbished Z · Pulsed power fusion · Advances in pulsed power technology · Z Ray Lemke Strip-line geometry: S ~ Strip Width + AK "equivalent" AK gap d(t) from 1-D simulatio

348

Fusion of heavy nuclei  

Science Journals Connector (OSTI)

Cross sections for evaporation residue formation following complete fusion of Br81+Zr90,94, Mo96, and Ru104 and Zr90+Zr90,94 have been measured over a broad range of energies from far below to well above the classical Coulomb barrier. We observe large changes of slope and magnitude among the excitation functions for these systems at all energies. There are pronounced structural variations at sub-barrier energies, less rapid than expected increases in evaporation residue formation at near-barrier energies and declining evaporation residue formation as the systems become heavier at still higher energies.

M. Beckerman; J. Wiggins; H. Aljuwair; M. K. Salomaa

1984-05-01T23:59:59.000Z

349

Nuclear bremsstrahlung and its radiation effects in fusion reactors  

Science Journals Connector (OSTI)

Nucleons, i.e. protons or neutrons, are emitted in many fusion processes of light nuclei. The fusion-generated nucleons can in turn fuse with or be captured by an un-reacted nuclear fuel, for example deuterium. The fusion reaction occurs at an average center of mass (COM) energy of 10?keV (thousand electron volts) or more in a typical fusion reactor. At such a relative low COM energy, the proton and deuteron are in a state where the relative angular momentum approaches zero, or an s-wave state. The single gamma radiation process is thus suppressed due to the conservation of parity. Instead, the gamma ray (typically of the order of a few MeV or more) released is likely to be accompanied by soft x-ray photons from a nuclear bremsstrahlung process, which generates continuous x-ray radiation peaked around a few hundred eV to a few keV. The average photon energy and spectrum properties of such a process is calculated with a semiclassical approach. This phenomenon may cause additional parasitic issues to a fusion reactor, while also opening up the possibility of new plasma diagnostics.

Nie Luo; Magdi Ragheb; George H Miley

2009-01-01T23:59:59.000Z

350

Study of internal magnetic field via polarimetry in fusion plasmas  

E-Print Network (OSTI)

Motivation Controlled thermonuclear fusion is a promising2007]. Controlled thermonuclear fusion is based on the

Zhang, Jie

2013-01-01T23:59:59.000Z

351

ADVANCES IN FUSION RESEARCH  

Science Journals Connector (OSTI)

...characterized the work of Joffe and his co-workers. 1 Yushmanov, E. E., in Plasma Physics and the Problem of Controlled Thermonuclear Reactions, ed. AI. A. Leontovich (London: Pergamon Press, 1960), vol. 4, p. 277. 2 Artsimovich, L. A...

Albert Simon

1965-01-01T23:59:59.000Z

352

Fusion Tritium Program in the United States  

Science Journals Connector (OSTI)

National Fusion Tritium Program / Proceedings of the Third Topical Meeting on Tritium Technology in Fission, Fusion and Isotopic Applications (Toronto, Ontario, Canada, May 1-6, 1988)

James L. Anderson; John R. Bartlit

353

Fusion Policy Advisory Committee (FPAC)  

SciTech Connect

This document is the final report of the Fusion Policy Advisory Committee. The report conveys the Committee's views on the matters specified by the Secretary in his charge and subsequent letters to the Committee, and also satisfies the provisions of Section 7 of the Magnetic Fusion Energy Engineering Act of 1980, Public Law 96-386, which require a triennial review of the conduct of the national Magnetic Fusion Energy program. Three sub-Committee's were established to address the large number of topics associated with fusion research and development. One considered magnetic fusion energy, a second considered inertial fusion energy, and the third considered issues common to both. For many reasons, the promise of nuclear fusion as a safe, environmentally benign, and affordable source of energy is bright. At the present state of knowledge, however, it is uncertain that this promise will become reality. Only a vigorous, well planned and well executed program of research and development will yield the needed information. The Committee recommends that the US commit to a plan that will resolve this critically important issue. It also outlines the first steps in a development process that will lead to a fusion Demonstration Power Plant by 2025. The recommended program is aggressive, but we believe the goal is reasonable and attainable. International collaboration at a significant level is an important element in the plan.

Not Available

1990-09-01T23:59:59.000Z

354

The path to fusion power  

Science Journals Connector (OSTI)

...proportional to P 2. The energy confinement time...determines the energy gain of the fusion...needed to keep the electric current in the plasma...in France, once planning permission-which...The much higher energy fusion neutrons...essentially the same distributions of energies as those...

2007-01-01T23:59:59.000Z

355

Fusion needs more than SNAREs  

Science Journals Connector (OSTI)

... then fuse their membrane with that of other compartments or with the plasma membrane. Without fusion, all such 'membrane traffic' would grind to a halt. Nerve cells would stop ... compartments would shed vesicles until the compartments disappeared. It seemed all but settled that membrane fusion was mediated by the so-called SNAREs — proteins that inhabit all ...

Wolfhard Almers

2001-02-01T23:59:59.000Z

356

Fusion history beyond the fiascos  

Science Journals Connector (OSTI)

... It is 50 years since the first international symposium on fusion energy research took place in Geneva, Switzerland, as part of the second United Nations ... the United Kingdom, the Soviet Union and the United States announced the declassification of controlled fusion research, raising the hope of clean and limitless energy for mankind.

Jean Jacquinot

2009-01-14T23:59:59.000Z

357

Membrane fusion: Ready ? aim ? fire!  

Science Journals Connector (OSTI)

... All cells use a programme of membrane fusion and fission to assemble membranes, both internally and on their surface. Given that biological ... internally and on their surface. Given that biological membranes are essentially two-dimensional fluids, fusion must obey certain restrictions that prevent incompatible membranes from intermixing. Without such selective contact, ...

Randy Schekman

1998-12-10T23:59:59.000Z

358

Fusion algebra of critical percolation  

E-Print Network (OSTI)

We present an explicit conjecture for the chiral fusion algebra of critical percolation considering Virasoro representations with no enlarged or extended symmetry algebra. The representations we take to generate fusion are countably infinite in number. The ensuing fusion rules are quasi-rational in the sense that the fusion of a finite number of these representations decomposes into a finite direct sum of these representations. The fusion rules are commutative, associative and exhibit an sl(2) structure. They involve representations which we call Kac representations of which some are reducible yet indecomposable representations of rank 1. In particular, the identity of the fusion algebra is a reducible yet indecomposable Kac representation of rank 1. We make detailed comparisons of our fusion rules with the recent results of Eberle-Flohr and Read-Saleur. Notably, in agreement with Eberle-Flohr, we find the appearance of indecomposable representations of rank 3. Our fusion rules are supported by extensive numerical studies of an integrable lattice model of critical percolation. Details of our lattice findings and numerical results will be presented elsewhere.

Jorgen Rasmussen; Paul A. Pearce

2007-06-19T23:59:59.000Z

359

Fusion Nuclear Science Facility (FNSF)  

E-Print Network (OSTI)

Fusion Nuclear Science Facility (FNSF) ­ Motivation, Role, Required Capabilities YK Martin Peng;1 Managed by UT-Battelle for the Department of Energy Example: fusion nuclear-nonnuclear coupling effects-composites; Nano-structure alloy; PFC designs, etc. · Nuclear-nonnuclear coupling in PFC: - Plasma ion flux induces

360

Fusion Energy Research Presentation to  

E-Print Network (OSTI)

, other ICCs 14-MeV neutron source Base fusion power technologies Base Plasma Support technologies Decision point DEMO Volumetric neutron source Theory & Simulation ICC ETR DEMO #12;Advanced Computing, Bioremediation Fusion Energy CombustionMaterials #12;#12;Microwave Imaging Reflectometry Laboratory tests

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Stochastic semi-classical description of fusion at near-barrier energies  

SciTech Connect

Fusion reactions of heavy ions are investigated by employing a simple stochastic semi-classical model, which includes coupling between the relative motion and low frequency collective surface modes of colliding ions similarly to the quantal coupled-channels description. The quantal effect enters into the calculation through the initial zero-point fluctuations of the surface vibrations. A good agreement with results of coupled-channels calculations as well as experimental data is obtained for fusion cross sections of Ni isotopes. The internal excitations in nonfusing events as well as the fusion time are investigated.

Ayik, Sakir [Physics Department, Tennessee Technological University, Cookville, Tennessee 38505 (United States); Yilmaz, Bulent [Physics Department, Ankara University, TR-06100 Ankara (Turkey); Grand Accelerateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5 (France); Lacroix, Denis [Grand Accelerateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5 (France)

2010-03-15T23:59:59.000Z

362

Molecular and Cellular Mechanisms of Mammalian Cell Fusion  

Science Journals Connector (OSTI)

The types of cell fusion best understood in mammals include the fusion of sperm and egg [3], fusion of cytotrophoblast cells to form syncytiotrophoblast [4], fusion of myoblasts to form myotubes [5], and fusion o...

Xiaofeng Zhou; Jeffrey L. Platt

2011-01-01T23:59:59.000Z

363

Muon spectrum and convoy effects after muon-catalyzed fusion  

Science Journals Connector (OSTI)

We study final-state interactions of the muon after muon-catalyzed D-T fusion reaction with the ? particle and with target matter. The yield of convoy muons, traveling with the ? particle but remaining unbound is calculated. Energy loss in the dense target may lead to capture of a fraction of these muons into outer shells of the ? particle. We show that the final capture probability can be strongly density dependent.

B. Müller; H. E. Rafelski; J. Rafelski

1989-09-01T23:59:59.000Z

364

Key Accomplishments @ Catalysis: Reactivity and Structure Group | Chemistry  

NLE Websites -- All DOE Office Websites (Extended Search)

Recent Key Accomplishments Recent Key Accomplishments WGS: Importance of the Metal-Oxide Interface in Catalysis: In Situ Studies of the Water-Gas Shift Reaction by Ambient-Pressure X-ray Photoelectron Spectroscopy A New Type of Strong Metal-Support Interaction and the Production of H-2 through the Transformation of Water on Pt/CeO2(111) and Pt/CeOx/TiO2(110) Catalysts In situ studies of CeO2-supported Pt, Ru, and Pt-Ru alloy catalysts for the water-gas shift reaction: Active phases and reaction intermediates In situ/operando studies for the production of hydrogen through the water-gas shift on metal oxide catalysts Mechanistic understanding of WGS catalysts from first principles: Au(111) Supported Oxide Nanoparticles Theoretical catalyst optimization of WGS catalysts: Cu(111) supported oxide nanostructures

365

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

FAQ FAQ FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement Answers to Frequently Asked Questions about Fusion Research An updated, searchable Fusion FAQ is being prepared. In the meantime, the incomplete public-domain Fusion FAQ from 1994-1995 is still available

366

Fusion of neutron-rich oxygen isotopes in the crust of accreting neutron stars  

Science Journals Connector (OSTI)

Fusion reactions in the crust of an accreting neutron star are an important source of heat, and the depth at which these reactions occur is important for determining the temperature profile of the star. Fusion reactions depend strongly on the nuclear charge Z. Nuclei with Z?6 can fuse at low densities in a liquid ocean. However, nuclei with Z=8 or 10 may not burn until higher densities where the crust is solid and electron capture has made the nuclei neutron rich. We calculate the S factor for fusion reactions of neutron rich nuclei including O24+O24 and Ne28+Ne28. We use a simple barrier penetration model. The S factor could be further enhanced by dynamical effects involving the neutron rich skin. This possible enhancement in S should be studied in the laboratory with neutron rich radioactive beams. We model the structure of the crust with molecular dynamics simulations. We find that the crust of accreting neutron stars may contain micro-crystals or regions of phase separation. Nevertheless, the screening factors that we determine for the enhancement of the rate of thermonuclear reactions are insensitive to these features. Finally, we calculate the rate of thermonuclear O24+O24 fusion and find that O24 should burn at densities near 1011 g/cm3. The energy released from this and similar reactions may be important for the temperature profile of the star.

C. J. Horowitz; H. Dussan; D. K. Berry

2008-04-29T23:59:59.000Z

367

LiWall Fusion - The New Concept of Magnetic Fusion  

SciTech Connect

Utilization of the outstanding abilities of a liquid lithium layer in pumping hydrogen isotopes leads to a new approach to magnetic fusion, called the LiWall Fusion. It relies on innovative plasma regimes with low edge density and high temperature. The approach combines fueling the plasma by neutral injection beams with the best possible elimination of outside neutral gas sources, which cools down the plasma edge. Prevention of cooling the plasma edge suppresses the dominant, temperature gradient related turbulence in the core. Such an approach is much more suitable for controlled fusion than the present practice, relying on high heating power for compensating essentially unlimited turbulent energy losses.

L.E. Zakharov

2011-01-12T23:59:59.000Z

368

Role of nuclear fusion in future energy systems and the environment under future uncertainties  

Science Journals Connector (OSTI)

Debates about whether or not to invest heavily in nuclear fusion as a future innovative energy option have been made within the context of energy technology development strategies. This is because the prospects for nuclear fusion are quite uncertain and the investments therefore carry the risk of quite large regrets, even though investment is needed in order to develop the technology. The timeframe by which nuclear fusion could become competitive in the energy market has not been adequately studied, nor has roles of the nuclear fusion in energy systems and the environment. The present study has two objectives. One is to reveal the conditions under which nuclear fusion could be introduced economically (hereafter, we refer to such introductory conditions as breakeven prices) in future energy systems. The other objective is to evaluate the future roles of nuclear fusion in energy systems and in the environment. Here we identify three roles that nuclear fusion will take on when breakeven prices are achieved: (i) a portion of the electricity market in 2100, (ii) reduction of annual global total energy systems cost, and (iii) mitigation of carbon tax (shadow price of carbon) under CO2 constraints. Future uncertainties are key issues in evaluating nuclear fusion. Here we treated the following uncertainties: energy demand scenarios, introduction timeframe for nuclear fusion, capacity projections of nuclear fusion, CO2 target in 2100, capacity utilization ratio of options in energy/environment technologies, and utility discount rates. From our investigations, we conclude that the presently designed nuclear fusion reactors may be ready for economical introduction into energy systems beginning around 2050–2060, and we can confirm that the favorable introduction of the reactors would reduce both the annual energy systems cost and the carbon tax (the shadow price of carbon) under a CO2 concentration constraint.

Koji Tokimatsu; Jun’ichi Fujino; Satoshi Konishi; Yuichi Ogawa; Kenji Yamaji

2003-01-01T23:59:59.000Z

369

Key Activities | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Key Activities Key Activities Key Activities The Water Power Program conducts work in four key areas at the forefront of water power research. The Program is structured to help the United States meet its growing energy demands sustainably and cost-effectively by developing innovative renewable water power technologies, breaking down market barriers to deployment, building the infrastructure to test new technologies, and assessing water power resources for integration into our nation's grid. Research and Development Introduce and advance new marine and hydrokinetic technologies to provide sustainable and cost-effective renewable energy from the nation's waves, tides, currents, and ocean thermal gradients. Research and develop innovative hydropower technologies to sustainably tap our country's diverse water resources including rivers,

370

Status report on fusion research  

Science Journals Connector (OSTI)

At the beginning of the twenty-first century mankind is faced with the serious problem of meeting the energy demands of a rapidly industrializing population around the globe. This, against the backdrop of fast diminishing fossil fuel resources (which have been the main source of energy of the last century) and the increasing realization that the use of fossil fuels has started to adversely affect our environment, has greatly intensified the quest for alternative energy sources. In this quest, fusion has the potential to play a very important role and we are today at the threshold of realizing net energy production from controlled fusion experiments. Fusion is, today, one of the most promising of all alternative energy sources because of the vast reserves of fuel, potentially lasting several thousands of years and the possibility of a relatively 'clean' form of energy, as required for use in concentrated urban industrial settings, with minimal long term environmental implications. The last decade and a half has seen unprecedented advances in controlled fusion experiments with the discovery of new regimes of operations in experiments, production of 16?MW of fusion power and operations close to and above the so-called 'break-even' conditions. A great deal of research has also been carried out in analysing various socio-economic aspects of fusion energy. This paper briefly reviews the various aspects and achievements of fusion research all over the world during this period.

International Fusion Research Council (IFRC)

2005-01-01T23:59:59.000Z

371

Fusion Power Demonstration III  

SciTech Connect

This is the third in the series of reports covering the Fusion Power Demonstration (FPD) design study. This volume considers the FPD-III configuration that incorporates an octopole end plug. As compared with the quadrupole end-plugged designs of FPD-I and FPD-II, this octopole configuration reduces the number of end cell magnets and shortens the minimum ignition length of the central cell. The end-cell plasma length is also reduced, which in turn reduces the size and cost of the end cell magnets and shielding. As a contiuation in the series of documents covering the FPD, this report does not stand alone as a design description of FPD-III. Design details of FPD-III subsystems that do not differ significantly from those of the FPD-II configuration are not duplicated in this report.

Lee, J.D. (ed.)

1985-07-01T23:59:59.000Z

372

Fusion reactor pumped laser  

DOE Patents (OSTI)

A nuclear pumped laser capable of producing long pulses of very high power laser radiation is provided. A toroidal fusion reactor provides energetic neutrons which are slowed down by a moderator. The moderated neutrons are converted to energetic particles capable of pumping a lasing medium. The lasing medium is housed in an annular cell surrounding the reactor. The cell includes an annular reflecting mirror at the bottom and an annular output window at the top. A neutron reflector is disposed around the cell to reflect escaping neutrons back into the cell. The laser radiation from the annular window is focused onto a beam compactor which generates a single coherent output laser beam. 10 figs.

Jassby, D.L.

1987-09-04T23:59:59.000Z

373

Portuguese research program on nuclear fusion  

Science Journals Connector (OSTI)

The Portuguese research program on nuclear fusion is presented. The experimental activity associated with...

C. A. F. Varandas; J. A. C. Cabral; M. E. Manso; F. Serra

1994-12-01T23:59:59.000Z

374

Fusion et volution des caractristiques topologiques  

E-Print Network (OSTI)

exactement n 1 types de fusions possibles, qui sont les fusions de dimension 0 � n 1. Pour pouvoir e#27Chapitre 6 Fusion et �volution des caract�ristiques topologiques Chapitre 5, nous avons d�#28;ni la carte topologique en dimension 3. Cette d�#28;nition utilise l'op�ration de fusion, que nous avons pr

Damiand, Guillaume

375

Exotic fusion systems over 2-groups  

E-Print Network (OSTI)

and types of fusion systems. Definition Fix a prime p, a finite p-group S, and a fusion system F over S. LetExotic fusion systems over 2-groups Bob Oliver joint with Kasper Andersen and Joana Ventura The fusion category of a finite group G encodes the conjugacy relations within a Sylow p-subgroup S of G

Thévenaz, Jacques

376

FUSION ET VOLUTION DES CARACTRISTIQUES TOPOLOGIQUES  

E-Print Network (OSTI)

n, il existe exactement n-1 types de fusions possibles, qui sont les fusions de dimension 0 à n - 1CHAPITRE 6 FUSION ET �VOLUTION DES CARACT�RISTIQUES TOPOLOGIQUES Chapitre 5, nous avons défini la carte topologique en dimension 3. Cette définition utilise l'opération de fusion, que nous avons

Damiand, Guillaume

377

Electron Screening Effect on Stellar Thermonuclear Fusion  

E-Print Network (OSTI)

thermonuclear fusions and show that these scenarios do not apply to stellar conditions. c ? 2013 WILEY

K. -h. Spatschek; M. Bonitz; T. Klinger; U. Ebert; C. Franck; A. V. Keudell; D. Naujoks; M. Dewitz; A. Y. Potekhin; G. Chabrier

2012-01-01T23:59:59.000Z

378

2002 Fusion Summer Study Executive Summary  

E-Print Network (OSTI)

2002 Fusion Summer Study Executive Summary 31 July 2002 #12;page 2 of 15 2002 Fusion Summer Study Executive Summary The 2002 Fusion Summer Study was conducted from July 8-19, 2002, in Snowmass, CO, and carried out a critical assessment of major next-steps in the fusion energy sciences program in both

379

Fusion Protein Products Screen Purify Detect Cleave  

E-Print Network (OSTI)

Fusion Protein Products · Screen · Purify · Detect · Cleave Fusion Protein Products · Screen researchers look to plasmid vectors to express fusion proteins, they find themselves in need of methods proteins is also included for those fusion proteins that may have an inaccessible tag. Pierce offers a host

Lebendiker, Mario

380

Tritium diagnostics in a fusion reactor  

Science Journals Connector (OSTI)

Methods for controlling tritium in a fusion reactor are reviewed. The characteristic features of the...

A. I. Markin; N. I. Syromyatnikov; A. M. Belov

2010-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

FUSION FRAMES AND THEORETICAL APPLICATIONS: FOR THE FUSION FRAME WEB PAGE  

E-Print Network (OSTI)

FUSION FRAMES AND THEORETICAL APPLICATIONS: FOR THE FUSION FRAME WEB PAGE PETER G. CASAZZA The deepest and most difficult question in Fusion Frame Theory is the construction of fusion frames with added that they do not show how to construct the frames. Recently, Casazza and Fickus [4] have developed a Fusion

Casazza, Pete

382

(MS WORD TEMPLATE for Submission in Fusion Engineering and Design) Security on the US Fusion Grid  

E-Print Network (OSTI)

(MS WORD TEMPLATE for Submission in Fusion Engineering and Design) Security on the US Fusion Grid J, FusionGrid, grid computing 1. Introduction Critical to the success of any computational grid is security to improve security for the US Fusion Grid (FusionGrid) [1]. Collaboratory workers have adapted secure

Thompson, Mary R.

383

Nuclear fusion: Fast heating scalable to laser fusion ignition  

Science Journals Connector (OSTI)

... fuel by a short-duration laser pulse is a promising route to generating energy by nuclear fusion, and has been demonstrated on an experimental scale using a novel fast-ignitor geometry. ...

R. Kodama, H. Shiraga, K. Shigemori, Y. Toyama, S. Fujioka, H. Azechi, H. Fujita, H. Habara, T. Hall, Y. Izawa, et al.

2002-08-29T23:59:59.000Z

384

Nuclear Fusion and Non-Fusion in Theobroma cacao L.  

Science Journals Connector (OSTI)

... or in /S^.g x ^i-3), the substance which 'interferes' with nuclear fusion diffuses from the male cytoplasm into that associated with the polar nuclei, from which ...

M. C. BENNETT, F. W. COPE

1959-05-30T23:59:59.000Z

385

Advanced fusion concepts: project summaries  

SciTech Connect

This report contains descriptions of the activities of all the projects supported by the Advanced Fusion Concepts Branch of the Office of Fusion Energy, US Department of Energy. These descriptions are project summaries of each of the individual projects, and contain the following: title, principle investigators, funding levels, purpose, approach, progress, plans, milestones, graduate students, graduates, other professional staff, and recent publications. Information is given for each of the following programs: (1) reverse-field pinch, (2) compact toroid, (3) alternate fuel/multipoles, (4) stellarator/torsatron, (5) linear magnetic fusion, (6) liners, and (7) Tormac. (MOW)

None

1980-12-01T23:59:59.000Z

386

Graph fusion algebras of WLM(p,p')  

E-Print Network (OSTI)

We consider the W-extended logarithmic minimal model WLM(p,p'). As in the rational minimal models, the so-called fundamental fusion algebra of WLM(p,p') is described by a simple graph fusion algebra. The fusion matrices in the regular representation thereof are mutually commuting, but in general not diagonalizable. Nevertheless, we show that they can be brought simultaneously to block-diagonal forms whose blocks are upper-triangular matrices of dimension 1, 3, 5 or 9. The directed graphs associated with the two fundamental modules are described in detail. The corresponding adjacency matrices share a complete set of common generalized eigenvectors organized as a web constructed by interlacing the Jordan chains of the two matrices. This web is here called a Jordan web and it consists of connected subwebs with 1, 3, 5 or 9 generalized eigenvectors. The similarity matrix, formed by concatenating these vectors, simultaneously brings the two fundamental adjacency matrices to Jordan canonical form modulo permutation similarity. The ranks of the participating Jordan blocks are 1 or 3, and the corresponding eigenvalues are given by 2cos(j\\pi/n) where j=0,...,n and n=p,p'. For p>1, only some of the modules in the fundamental fusion algebra of WLM(p,p') are associated with boundary conditions within our lattice approach. The regular representation of the corresponding fusion subalgebra has features similar to the ones in the regular representation of the fundamental fusion algebra, but with dimensions of the upper-triangular blocks and connected Jordan-web components given by 1, 2, 3 or 8. Some of the key results are illustrated for W-extended critical percolation WLM(2,3).

Jorgen Rasmussen

2009-11-17T23:59:59.000Z

387

Interplay between compound and fragments aspects of nuclear fission and heavy-ion reaction  

SciTech Connect

The scission point in nuclear fission plays a special role where one-body system changes to two-body system. Inverse of this situation is realized in heavy-ion fusion reaction where two-body system changes to one body system. Among several peculiar phenomena expected to occur during this change, we focus our attention to the behavior of compound and fragments shell effects. Some aspects of the interplay between compound and fragments shell effect are discussed related to the topics of the fission valleys in the potential energy surface of actinide nuclei and the fusion-like trajectory found in the cold fusion reaction leading to superheavy nuclei.

Moller, Peter [Los Alamos National Laboratory; Iwamoto, A [JAPAN; Ichikawa, I [JAPAN

2010-09-10T23:59:59.000Z

388

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Our Sun Our Sun FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement The Sun Runs on Fusion Energy How the sun looks through x-ray eyes! Like all stars, the sun is a huge fusion reactor, pumping out 100 million times as much energy in a single second as the entire population of Earth

389

The National Ignition Facility and the Path to Fusion Energy  

SciTech Connect

The National Ignition Facility (NIF) is operational and conducting experiments at the Lawrence Livermore National Laboratory (LLNL). The NIF is the world's largest and most energetic laser experimental facility with 192 beams capable of delivering 1.8 megajoules of 500-terawatt ultraviolet laser energy, over 60 times more energy than any previous laser system. The NIF can create temperatures of more than 100 million degrees and pressures more than 100 billion times Earth's atmospheric pressure. These conditions, similar to those at the center of the sun, have never been created in the laboratory and will allow scientists to probe the physics of planetary interiors, supernovae, black holes, and other phenomena. The NIF's laser beams are designed to compress fusion targets to the conditions required for thermonuclear burn, liberating more energy than is required to initiate the fusion reactions. Experiments on the NIF are focusing on demonstrating fusion ignition and burn via inertial confinement fusion (ICF). The ignition program is conducted via the National Ignition Campaign (NIC) - a partnership among LLNL, Los Alamos National Laboratory, Sandia National Laboratories, University of Rochester Laboratory for Laser Energetics, and General Atomics. The NIC program has also established collaborations with the Atomic Weapons Establishment in the United Kingdom, Commissariat a Energie Atomique in France, Massachusetts Institute of Technology, Lawrence Berkeley National Laboratory, and many others. Ignition experiments have begun that form the basis of the overall NIF strategy for achieving ignition. Accomplishing this goal will demonstrate the feasibility of fusion as a source of limitless, clean energy for the future. This paper discusses the current status of the NIC, the experimental steps needed toward achieving ignition and the steps required to demonstrate and enable the delivery of fusion energy as a viable carbon-free energy source.

Moses, E

2011-07-26T23:59:59.000Z

390

Fusion materials irradiations at MaRIE's fission fusion facility  

SciTech Connect

Los Alamos National Laboratory's proposed signature facility, MaRIE, will provide scientists and engineers with new capabilities for modeling, synthesizing, examining, and testing materials of the future that will enhance the USA's energy security and national security. In the area of fusion power, the development of new structural alloys with better tolerance to the harsh radiation environments expected in fusion reactors will lead to improved safety and lower operating costs. The Fission and Fusion Materials Facility (F{sup 3}), one of three pillars of the proposed MaRIE facility, will offer researchers unprecedented access to a neutron radiation environment so that the effects of radiation damage on materials can be measured in-situ, during irradiation. The calculated radiation damage conditions within the F{sup 3} match, in many respects, that of a fusion reactor first wall, making it well suited for testing fusion materials. Here we report in particular on two important characteristics of the radiation environment with relevancy to radiation damage: the primary knock-on atom spectrum and the impact of the pulse structure of the proton beam on temporal characteristics of the atomic displacement rate. With respect to both of these, analyses show the F{sup 3} has conditions that are consistent with those of a steady-state fusion reactor first wall.

Pitcher, Eric J [Los Alamos National Laboratory

2010-10-06T23:59:59.000Z

391

Laser-Driven Nuclear Fusion  

Science Journals Connector (OSTI)

Energy is set free not only by fission of heavy nuclei but also when the lightest nuclei fuse to form heavier ones. Such fusion processes are the energy source of our sun and other stars. Great effort is being...

S. Witkowski

1982-01-01T23:59:59.000Z

392

Table-top nuclear fusion  

Science Journals Connector (OSTI)

... chance of colliding with accelerated deuterium ions from adjacent clusters with sufficient woomph to create nuclear fusion - the deuterium ions would fuse to create helium nuclei, releasing neutrons of a ...

Henry Gee

1999-04-08T23:59:59.000Z

393

Nuclear Fusion in the Sun  

Science Journals Connector (OSTI)

...February 2004 research-article Articles Nuclear Fusion in the Sun Giovanni Fiorentini * Barbara Ricci ** Francesco L. Villante *** * E-mail: fiorenti@fe.infn.it ** E-mail......

Giovanni Fiorentini; Barbara Ricci; Francesco L. Villante

2004-02-01T23:59:59.000Z

394

Condensed hydrogen for thermonuclear fusion  

SciTech Connect

Inertial confinement fusion (ICF) power, in either pure fusion or fission-fusion hybrid reactors, is a possible solution for future world's energy demands. Formation of uniform layers of a condensed hydrogen fuel in ICF targets has been a long standing materials physics challenge. Here, we review the progress in this field. After a brief discussion of the major ICF target designs and the basic properties of condensed hydrogens, we review both liquid and solid layering methods, physical mechanisms causing layer nonuniformity, growth of hydrogen single crystals, attempts to prepare amorphous and nanostructured hydrogens, and mechanical deformation behavior. Emphasis is given to current challenges defining future research areas in the field of condensed hydrogens for fusion energy applications.

Kucheyev, S. O.; Hamza, A. V. [Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

2010-11-15T23:59:59.000Z

395

EURATOM/CCFE Fusion Association  

E-Print Network (OSTI)

- Public Understanding and Education Outreach 7 - Training 7 JET Operations 8 JET Studies 11 MAST 14 - MAST to capture heat from the fusion core to generate electricity in a power station. In this Executive Summary

396

Fusion Energy Sciences Network Requirements  

E-Print Network (OSTI)

Division, and the Office of Fusion Energy Sciences. This isEnergy Sciences, DOE Office of Science Energy SciencesDepartment of Energy, Office of Science, Office of Advanced

Dart, Eli

2014-01-01T23:59:59.000Z

397

The Spheromak Path to Fusion  

Science Journals Connector (OSTI)

Options for a spheromak fusion-energy reactor are described and provide ... configuration offers. However, the ability of the spheromak to confine plasma energy has not yet ... . These are being studied in the Su...

K. I. Thomassen; E. B. Hooper; D. D. Ryutov

1998-09-01T23:59:59.000Z

398

Fusion Energy Sciences Network Requirements  

E-Print Network (OSTI)

program to achieve ignition, to provide laser facility timeIgnition Facility National Institute for Fusion Science National LaserIgnition Facility (NIF). In support of the OMEGA Laser

Dart, Eli

2014-01-01T23:59:59.000Z

399

Fusion-neutron production in the TFTR with deuterium neutral beam injection  

SciTech Connect

We report measurements of the fusion reaction rate in the Tokamak Fusion Test Reactor (TFTR) covering a wide range of plasma conditions and injected neutral beam powers up to 6.3 MW. The fusion-neutron production rate in beam-injected plasmas decreases slightly with increasing plasma density n/sub e/, even though the energy confinement parameter n/sub e/tau/sub E/ generally increases with density. The measurements indicate and Fokker-Planck simulations show that with increasing density the source of fusion neutrons evolves from mainly beam-beam and beam-target reactions at very low n/sub e/ to a combination of beam-target and thermonuclear reactions at high n/sub e/. At a given plasma current, the reduction in neutron source strength at higher n/sub e/ is due to both a decrease in electron temperature and in beam-beam reaction rate. The Fokker-Planck simulations also show that at low n/sub e/, plasma rotation can appreciably reduce the beam-target reaction rate for experiments with co-injection only. The variation of neutron source strength with plasma and beam parameters is as expected for beam-dominated regimes. However, the Fokker-Planck simulations systematically overestimate the measured source strength by a factor of 2 to 3; the source of this discrepancy has not yet been identified.

Hendel, H.W.; England, A.C.; Jassby, D.L.; Mirin, A.A.; Nieschmidt, E.B.

1986-06-01T23:59:59.000Z

400

EPAct Transportation Regulatory Activities: Key Terms  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Terms Key Terms to someone by E-mail Share EPAct Transportation Regulatory Activities: Key Terms on Facebook Tweet about EPAct Transportation Regulatory Activities: Key Terms on Twitter Bookmark EPAct Transportation Regulatory Activities: Key Terms on Google Bookmark EPAct Transportation Regulatory Activities: Key Terms on Delicious Rank EPAct Transportation Regulatory Activities: Key Terms on Digg Find More places to share EPAct Transportation Regulatory Activities: Key Terms on AddThis.com... Home About Covered Fleets Compliance Methods Alternative Fuel Petitions Resources Guidance Documents Statutes & Regulations Program Annual Reports Fact Sheets Newsletter Case Studies Workshops Tools Key Terms FAQs Key Terms The Energy Policy Act (EPAct) includes specific terminology related to

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

EPAct Transportation Regulatory Activities: Key Federal Statutes  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Key Federal Statutes to someone by E-mail Share EPAct Transportation Regulatory Activities: Key Federal Statutes on Facebook Tweet about EPAct Transportation Regulatory Activities: Key Federal Statutes on Twitter Bookmark EPAct Transportation Regulatory Activities: Key Federal Statutes on Google Bookmark EPAct Transportation Regulatory Activities: Key Federal Statutes on Delicious Rank EPAct Transportation Regulatory Activities: Key Federal Statutes on Digg Find More places to share EPAct Transportation Regulatory Activities: Key Federal Statutes on AddThis.com... Home About Contacts Covered Fleets Compliance Methods Alternative Fuel Petitions Resources Key Federal Statutes These are excerpts from federal statutes that established key Energy Policy Act (EPAct) transportation regulatory activities.

402

Contrib. Plasma Phys. 53, No. 45, 397 405 (2013) / DOI 10.1002/ctpp.201200094 Electron screening effect on stellar thermonuclear fusion  

E-Print Network (OSTI)

effect on stellar thermonuclear fusion Alexander Y. Potekhin1,2 and Gilles Chabrier2,3 1 Ioffe Physical thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusions

403

Fusion genes in breast cancer  

E-Print Network (OSTI)

Fusion genes in breast cancer Elizabeth M. Batty Clare College, University of Cambridge A dissertation submitted to the University of Cambridge in candidature for the degree of Doctor of Philosophy November 2010 ii... is the outcome of work done in collaboration except where specifically indicated in the text. It has not been submitted whole or in part for any other qualification at any other University. iii Summary Fusion genes in breast cancer Elizabeth Batty...

Batty, Elizabeth

2012-02-07T23:59:59.000Z

404

Heavy ion fusion science research for high energy density physics and fusion applications  

E-Print Network (OSTI)

1665. [38] B G Logan, 1993 Fusion Engineering and Design 22,J Perkins, (June 2007), to be submitted to Nuclear Fusion. [36] M Tabak 1996 Nuclear Fusion 36, No 2. [37] S Atzeni, and

Logan, B.G.

2007-01-01T23:59:59.000Z

405

../fusion/templates/mapguide/maroon/css/maroon_fusion.css background-image: url(../images/background.gif);  

E-Print Network (OSTI)

../fusion/templates/mapguide/maroon/css/maroon_fusion.css body { background-image: url(../images/background.gif); ../fusion/templates/mapguide/maroon/css/ maroon_fusion.css body { background-color: #3e5c5f; ../fusion/templates/mapguide/maroon/css/ maroon_fusion.css #ToolbarVertical { background: #500000; maroon_fusion.css #Toolbar { background

Ahmad, Sajjad

406

Placing Fusion Power on a Pedestal | Princeton Plasma Physics...  

NLE Websites -- All DOE Office Websites (Extended Search)

Placing Fusion Power on a Pedestal American Fusion News Category: Massachusetts Institute of Technology (MIT) Link: Placing Fusion Power on a Pedestal...

407

Fusion & Materials for Nuclear Systems Division | ornl.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion & Materials for Nuclear Systems SHARE Fusion & Materials for Nuclear Systems Division Fusion holds the promise of significant power with no carbon emissions and minimal...

408

Utility of spectral measurements of secondary reaction products  

SciTech Connect

The spectra of 15 MeV protons and 14 MeV neutrons produced in the burnup of 0.8 MeV THe ions and 1 MeV tritons through the d(THe,p) and d(t,n) fusion reactions contain information on the velocity distributions of the energetic THe ions and tritons. 11 refs., 2 figs.

Heidbrink, W.E.

1986-02-01T23:59:59.000Z

409

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Glossary Glossary FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement The Glossary of Plasma Physics and Fusion Energy Research Browse | Search | Submit an Entry Introduction, Sources and Contributors This Glossary seeks to provide plain-language definitions of over 3600

410

FusEdWeb | Fusion Education  

NLE Websites -- All DOE Office Websites (Extended Search)

Home> Student and Teacher Resources > For Introductory Students Home> Student and Teacher Resources > For Introductory Students FusEdWeb: Discover Fusion CPEP's Online Fusion Course Fusion FAQ Fusion and Plasma Glossary Plasma Dictionary Student and Teacher Resources Education and Outreach Ideas Other Fusion and Plasma Sites Great Sites Internet Plasma Physics EXperience GA's Fusion Energy Slide Show International Thermonuclear Experimental Reactor National Ignition Facility Search webby award honoree Webby Awards Honoree April 10, 2007 webby award honoree Links2Go - Fusion, November 9, 1998 FusEdWeb: Fusion Energy Education Our Sun | Other Stars and Galaxies | Inertial Confinement | Magnetic Confinement Guide to Fusion Education Resources for Introductory Physics Students This is a compilation of online and offline education resources for

411

A fast new method for measuring hard-to-diagnose 3D plasmas in fusion  

NLE Websites -- All DOE Office Websites (Extended Search)

A fast new method for measuring hard-to-diagnose 3D plasmas in fusion A fast new method for measuring hard-to-diagnose 3D plasmas in fusion facilities By John Greenwald March 12, 2013 Tweet Widget Facebook Like Google Plus One A simulated plasma in the Large Helical Device showing the thin blue saddle coils that researchers used to make diagnostic measurements with the new computer code. (Photo by Graphic by Sam Lazerson) A simulated plasma in the Large Helical Device showing the thin blue saddle coils that researchers used to make diagnostic measurements with the new computer code. Scientists at the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL) and the National Institute for Fusion Science (NIFS) in Japan have developed a rapid method for meeting a key challenge for fusion science. The challenge has been to simulate the diagnostic measurement of

412

Geotechnical characterization of calcareous sediments from the Dry Tortugas Keys and Marquesas Keys CBBL SRP study sites, Lower Florida Keys  

Science Journals Connector (OSTI)

Geotechnical characteristics of carbonate sediments from two test sites (Dry Tortugas Keys and Marquesas Keys) in the Lower Florida Keys were investigated as part of the Coastal Benthic Boundary Layer Special...

G. Veyera; H. Brandes; A. Silva

2001-11-01T23:59:59.000Z

413

Monroe County Extension Services Key West Office  

E-Print Network (OSTI)

Energy Services: 305-295-1010 Florida Keys Electric Co-op: 305-852-2431 Monroe County Roads & Bridges-292-4501 http://monroe.ifas.ufl.edu Key Largo Office: 102050 Overseas Highway, Room 244 City and County Tree Lower Keys: 305-797-4929 Upper Keys: 305-852-7161 Contact local tree services throughout the Keys

Jawitz, James W.

414

Fusion of $^{6}$Li with $^{159}$Tb} at near barrier energies  

E-Print Network (OSTI)

Complete and incomplete fusion cross sections for $^{6}$Li+$^{159}$Tb have been measured at energies around the Coulomb barrier by the $\\gamma$-ray method. The measurements show that the complete fusion cross sections at above-barrier energies are suppressed by $\\sim$34% compared to the coupled channels calculations. A comparison of the complete fusion cross sections at above-barrier energies with the existing data of $^{11,10}$B+$^{159}$Tb and $^{7}$Li+$^{159}$Tb shows that the extent of suppression is correlated with the $\\alpha$-separation energies of the projectiles. It has been argued that the Dy isotopes produced in the reaction $^{6}$Li+$^{159}$Tb, at below-barrier energies are primarily due to the $d$-transfer to unbound states of $^{159}$Tb, while both transfer and incomplete fusion processes contribute at above-barrier energies.

M. K. Pradhan; A. Mukherjee; P. Basu; A. Goswami; R. Kshetri; R. Palit; V. V. Parkar; M. Ray; Subinit Roy; P. Roy Chowdhury; M. Saha Sarkar; S. Santra

2011-06-10T23:59:59.000Z

415

Laser or charged-particle-beam fusion reactor with direct electric generation by magnetic flux compression  

DOE Patents (OSTI)

A high-power-density-laser or charged-particle-beam fusion reactor system maximizes the directed kinetic energy imparted to a large mass of liquid lithium by a centrally located fusion target. A fusion target is embedded in a large mass of lithium, of sufficient radius to act as a tritium breeding blanket, and provided with ports for the access of beam energy to implode the target. The directed kinetic energy is converted directly to electricity with high efficiency by work done against a pulsed magnetic field applied exterior to the lithium. Because the system maximizes the blanket thickness per unit volume of lithium, neutron-induced radioactivities in the reaction chamber wall are several orders of magnitude less than is typical of other fusion reactor systems. 25 figs.

Lasche, G.P.

1987-02-20T23:59:59.000Z

416

Fusion Plasma Theory project summaries  

SciTech Connect

This Project Summary book is a published compilation consisting of short descriptions of each project supported by the Fusion Plasma Theory and Computing Group of the Advanced Physics and Technology Division of the Department of Energy, Office of Fusion Energy. The summaries contained in this volume were written by the individual contractors with minimal editing by the Office of Fusion Energy. Previous summaries were published in February of 1982 and December of 1987. The Plasma Theory program is responsible for the development of concepts and models that describe and predict the behavior of a magnetically confined plasma. Emphasis is given to the modelling and understanding of the processes controlling transport of energy and particles in a toroidal plasma and supporting the design of the International Thermonuclear Experimental Reactor (ITER). A tokamak transport initiative was begun in 1989 to improve understanding of how energy and particles are lost from the plasma by mechanisms that transport them across field lines. The Plasma Theory program has actively-participated in this initiative. Recently, increased attention has been given to issues of importance to the proposed Tokamak Physics Experiment (TPX). Particular attention has been paid to containment and thermalization of fast alpha particles produced in a burning fusion plasma as well as control of sawteeth, current drive, impurity control, and design of improved auxiliary heating. In addition, general models of plasma behavior are developed from physics features common to different confinement geometries. This work uses both analytical and numerical techniques. The Fusion Theory program supports research projects at US government laboratories, universities and industrial contractors. Its support of theoretical work at universities contributes to the office of Fusion Energy mission of training scientific manpower for the US Fusion Energy Program.

Not Available

1993-10-01T23:59:59.000Z

417

Two-pulse driving of D + D nuclear fusion within a single Coulomb exploding nanodroplet  

Science Journals Connector (OSTI)

This paper presents a computational study of D + D fusion driven by Coulomb explosion (CE) within a single homonuclear deuterium nanodroplet subjected to double-pulse ultraintense laser irradiation. This irradiation scheme results in the attainment (by the first weaker pulse) of a transient inhomogeneous density profile which serves as a target for the driving (by the second superintense pulse) of nonuniform CE that triggers overrun effects and induces intrananodroplet (INTRA) D + D fusion. Scaled electron and ion dynamics simulations were utilized to explore the INTRA D + D fusion yields for double-pulse near-infrared laser irradiation of deuterium nanodroplets. The dependence of the INTRA yield on the nanodroplet size and on the parameters of the two laser pulses was determined establishing the conditions for the prevalence of efficient INTRA fusion. The INTRA fusion yields are amenable to experimental observation within an assembly of nanodroplets. The INTRA D + D fusion can be distinguished from the concurrent internanodroplet D + D fusion reaction occurring in the macroscopic plasma filament and outside it in terms of the different energies of the neutrons produced in these two channels.

Isidore Last; Fabio Peano; Joshua Jortner; Luis O. Silva

2010-01-01T23:59:59.000Z

418

Wittig Reaction 33 Reaction: Synthesis of Alkenes  

E-Print Network (OSTI)

" an "ylide" Cl R3 R R3 OR2 Ph3P R1 H R2 R1 R Br R1 H R PPh3 SN2 Phosphonium Salt Aldehyde or Ketone AlkeneWittig Reaction 33 The Wittig Reaction: Synthesis of Alkenes Intro The "Wittig Reaction" is one elimination reactions (E1 or E2 reactions from alcohols or alkyl halides, for example), in elimination

Jasperse, Craig P.

419

Evaluation of irradiation facility options for fusion materials research and development  

SciTech Connect

Successful development of fusion energy will require the design of high-performance structural materials that exhibit dimensional stability and good resistance to fusion neutron degradation of mechanical and physical properties. The high levels of gaseous (H, He) transmutation products associated with deuterium-tritium (D-T) fusion neutron transmutation reactions, along with displacement damage dose requirements up to 50-200 displacements per atom (dpa) for a fusion demonstration reactor (DEMO), pose an extraordinary challenge. The intense neutron source(s) is needed to address two complimentary missions: 1) Scientific investigations of radiation degradation phenomena and microstructural evolution under fusion-relevant irradiation conditions (to provide the foundation for designing improved radiation resistant materials), and 2) Engineering database development for design and licensing of next-step fusion energy machines such as a fusion DEMO. A wide variety of irradiation facilities have been proposed to investigate materials science phenomena and to test and qualify materials for a DEMO reactor. Currently available and proposed facilities include fission reactors (including isotopic and spectral tailoring techniques to modify the rate of H and He production per dpa), dual- and triple-ion accelerator irradiation facilities that enable greatly accelerated irradiation studies with fusion-relevant H and He production rates per dpa within microscopic volumes, D-Li stripping reaction and spallation neutron sources, and plasma-based sources. The advantages and limitations of the main proposed fusion materials irradiation facility options are reviewed. Evaluation parameters include irradiation volume, potential for performing accelerated irradiation studies, capital and operating costs, similarity of neutron irradiation spectrum to fusion reactor conditions, temperature and irradiation flux stability/control, ability to perform multiple-effect tests (e.g., irradiation in the presence of a flowing coolant, or in the presence of complex applied stress fields), and technical maturity/risk of the concept. Ultimately, it is anticipated that heavy utilization of ion beam and fission neutron irradiation facilities along with sophisticated materials models, in addition to a dedicated fusion-relevant neutron irradiation facility, will be necessary to provide a comprehensive and cost-effective understanding of anticipated materials evolution in a fusion DEMO and to therefore provide a timely and robust materials database.

Zinkle, Steven J [ORNL] [ORNL; Möslang, Anton [Karlsruhe Institute of Technology, Karlsruhe, Germany] [Karlsruhe Institute of Technology, Karlsruhe, Germany

2013-01-01T23:59:59.000Z

420

The Path to Magnetic Fusion Energy  

SciTech Connect

When the possibility of fusion as an energy source for electricity generation was realized in the 1950s, understanding of the plasma state was primitive. The fusion goal has been paced by, and has stimulated, the development of plasma physics. Our understanding of complex, nonlinear processes in plasmas is now mature. We can routinely produce and manipulate 100 million degree plasmas with remarkable finesse, and we can identify a path to commercial fusion power. The international experiment, ITER, will create a burning (self-sustained) plasma and produce 500 MW of thermal fusion power. This talk will summarize the progress in fusion research to date, and the remaining steps to fusion power.

Prager, Stewart (PPPL) [PPPL

2011-05-04T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Key-Insulated Symmetric Key Cryptography and Mitigating Attacks against Cryptographic Cloud Software  

E-Print Network (OSTI)

Key-Insulated Symmetric Key Cryptography and Mitigating Attacks against Cryptographic Cloud- sociated cryptographic keys in their entirety. In this paper, we investigate key-insulated symmetric key. To illustrate the feasibility of key-insulated symmetric key cryptography, we also report a proof

Dodis, Yevgeniy

422

Hydrodynamic Scaling Analysis of Nuclear Fusion driven by ultra-intense laser-plasma interactions  

E-Print Network (OSTI)

We discuss scaling laws of fusion yields generated by laser-plasma interactions. The yields are found to scale as a function of the laser power. The origin of the scaling law in the laser driven fusion yield is derived in terms of hydrodynamic scaling. We point out that the scaling properties can be attributed to the laser power dependence of three terms: the reaction rate, the density of the plasma and the projected range of the plasma particle in the target medium. The resulting scaling relations have a predictive power that enables estimating the fusion yield for a nuclear reaction which has not been investigated by means of the laser accelerated ion beams.

Sachie Kimura; Aldo Bonasera

2011-09-23T23:59:59.000Z

423

Neutron-induced dpa, transmutations, gas production, and helium embrittlement of fusion materials  

E-Print Network (OSTI)

In a fusion reactor materials will be subjected to significant fluxes of high-energy neutrons. As well as causing radiation damage, the neutrons also initiate nuclear reactions leading to changes in the chemical composition of materials (transmutation). Many of these reactions produce gases, particularly helium, which cause additional swelling and embrittlement of materials. This paper investigates, using a combination of neutron-transport and inventory calculations, the variation in displacements per atom (dpa) and helium production levels as a function of position within the high flux regions of a recent conceptual model for the "next-step" fusion device DEMO. Subsequently, the gas production rates are used to provide revised estimates, based on new density-functional-theory results, for the critical component lifetimes associated with the helium-induced grain-boundary embrittlement of materials. The revised estimates give more optimistic projections for the lifetimes of materials in a fusion power plant co...

Gilbert, M R; Nguyen-Manh, D; Zheng, S; Packer, L W; Sublet, J -Ch

2013-01-01T23:59:59.000Z

424

Annual Report of the EURATOM/UKAEA Fusion Programme 2008/09 1 Executive Summary  

E-Print Network (OSTI)

fusion on a power-plant-relevant scale (500 MW) and test key technologies needed for a power plant as a heat source the process that powers the sun and other stars. There would be major advantages with such an energy option; virtually unlimited and widely available fuel resources and no emission of environmentally

425

Automatic Skin Enhancement with Visible and Near-Infrared Image Fusion  

E-Print Network (OSTI)

Automatic Skin Enhancement with Visible and Near-Infrared Image Fusion Sabine SĂĽsstrunk School and hemo- globin, the key components of skin color, have little absorp- tion in the near-infrared (NIR to the incident light's wavelength, we show that near-infrared images provide information that can be used

Salvaggio, Carl

426

Study of internal magnetic field via polarimetry in fusion plasmas  

E-Print Network (OSTI)

to exploit in a fusion reactor on earth is the fusion of thethis process in a fusion reactor for power generationSince the cost of the fusion reactor increases with the

Zhang, Jie

2013-01-01T23:59:59.000Z

427

SIMULATIONS OF ALPHA PARAMETERS IN A TFTR DT SUPERSHOT WITH HIGH FUSION POWER  

E-Print Network (OSTI)

power production for approximately 0.5 s. Analysis of the highest non-disruptive discharge from May 1994 of the deuterium and tritium densities, the hydrogenic isotopic mass, the fusion reactions, the fast ion parameters isotopic scaling of the thermal plasma confinement with isotopic mass [8, 91. Several methods are being

Budny, Robert

428

Fusion Engineering and Design 53 (2001) 105111 Fast ion collective Thomson scattering, JET results  

E-Print Network (OSTI)

dynamics and specific issues for ion cyclotron resonance heating. © 2001 Elsevier Science B.V. All rights of energetic ion distributions generated by fusion reactions and ion cyclotron resonance heating (ICRH). CTS reserved. Keywords: Fast ions; Collective Thomson scattering; JET; TEXTOR; ICRH (Ion Cyclotron Resonance

Egedal, Jan

429

DOSE RATES FROM NEUTRON ACTIVATION OF FUSION REACTOR COMPONENTS  

E-Print Network (OSTI)

NEUTRON ACTIVATION OF FUSION REACTOR C01WONENTS LawrenceNeutron Activation of Fusion Reactor Components Lawrence

Ruby, Lawrence

2014-01-01T23:59:59.000Z

430

Laser fusion experiments at LLL  

SciTech Connect

These notes present the experimental basis and status for laser fusion as developed at LLL. Two other chapters, one authored by K.A. Brueckner and the other by C. Max, present the theoretical implosion physics and laser plasma interaction physics. The notes consist of six sections. The first is an introductory section which provides some of the history of inertial fusion and a simple explanation of the concepts involved. The second section presents an extensive discussion of diagnostic instrumentation used in the LLL Laser Fusion Program. The third section is a presentation of laser facilities and capabilities at LLL. The purpose here is to define capability, not to derive how it was obtained. The fourth and fifth sections present the experimental data on laser-plasma interaction and implosion physics. The last chapter is a short projection of the future.

Ahlstrom, H.G.

1980-06-16T23:59:59.000Z

431

A1.5 Fusion Performance  

SciTech Connect

Analysis and radiation hydrodynamics simulations for expected high-gain fusion target performance on a demonstration 1-GWe Laser Inertial Fusion Energy (LIFE) power plant in the mid-2030s timeframe are presented. The required laser energy driver is 2.2 MJ at a 0.351-{micro}m wavelength, and a fusion target gain greater than 60 at a repetition rate of 16 Hz is the design goal for economic and commercial attractiveness. A scaling-law analysis is developed to benchmark the design parameter space for hohlraum-driven central hot-spot ignition. A suite of integrated hohlraum simulations is presented to test the modeling assumptions and provide a basis for a near-term experimental resolution of the key physics uncertainties on the National Ignition Facility (NIF). The NIF is poised to demonstrate ignition by 2012 based on the central hot spot (CHS) mode of ignition and propagating thermonuclear burn [1]. This immediate prospect underscores the imperative and timeliness of advancing inertial fusion as a carbon-free, virtually limitless source of energy by the mid-21st century to substantially offset fossil fuel technologies. To this end, an intensive effort is underway to leverage success at the NIF and to provide the foundations for a prototype 'LIFE.1' engineering test facility by {approx}2025, followed by a commercially viable 'LIFE.2' demonstration power plant operating at 1 GWe by {approx}2035. The current design goal for LIFE.2 is to accommodate {approx}2.2 MJ of laser energy (entering the high-Z radiation enclosure or 'hohlraum') at a 0.351-{micro}m wavelength operating at a repetition rate of 16 Hz and to provide a fusion target yield of 132 MJ. To achieve this design goal first requires a '0-d' analytic gain model that allows convenient exploration of parameter space and target optimization. This step is then followed by 2- and 3-dimensional radiation-hydrodynamics simulations that incorporate laser beam transport, x-ray radiation transport, atomic physics, and thermonuclear burn [2]. These simulations form the basis for assessing the susceptibility to hydrodynamic instability growth, target performance margins, laser backscatter induced by plasma density fluctuations within the hohlraum, and the threat spectrum emerging from the igniting capsule, e.g., spectra, fluences and anisotropy of the x rays and ions, for input into the chamber survivability calculations. The simulations follow the guidelines of a 'point design' methodology, which formally designates a well-defined milestone in concept development that meets established criteria for experimental testing. In Section 2, the 0-d analytic gain model to survey gain versus laser energy parameter space is discussed. Section 3 looks at the status of integrated hohlraum simulations and the needed improvements in laser-hohlraum coupling efficiency to meet the LIFE.2 threshold (net) target gain of {approx}60. Section 4 considers advanced hohlraum designs to well exceed the LIFE.2 design goal for satisfactory performance margins. We summarize in Sec. 5.

Amendt, P

2011-03-31T23:59:59.000Z

432

Fusion roadmapping | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

Fusion roadmapping Fusion roadmapping Subscribe to RSS - Fusion roadmapping The process of mapping a path to a commercial fusion reactor by planning a sequence of future machines. Premiere issue of "Quest" magazine details PPPL's strides toward fusion energy and advances in plasma science Quest Magazine Summer 2013 Welcome to the premiere issue of Quest, the annual magazine of the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL). Read more about Premiere issue of "Quest" magazine details PPPL's strides toward fusion energy and advances in plasma science PPPL and ITER: Lab teams support the world's largest fusion experiment with leading-edge ideas and design Read more about PPPL and ITER: Lab teams support the world's largest fusion experiment with leading-edge ideas and design

433

Plasma physics: Nuclear fusion comes closer  

Science Journals Connector (OSTI)

... A NEW initiative in international cooperation among the nuclear fusion research community, which may lead to a world engineering test reactor, was announced at ... for an engineering the most widely accepted element of a common fusion plan.

R.S. Pease

1986-12-11T23:59:59.000Z

434

Inertial-confinement fusion with fast ignition  

Science Journals Connector (OSTI)

...achieve ignition and thermonuclear burn. For a fusion power plant, gains...the ratio of the thermonuclear energy to the initial...released by the thermonuclear burn in unit mass...compressed spherical fusion fuel. Higher gain...

1999-01-01T23:59:59.000Z

435

MAST Upgrade Advancing compact fusion sources  

E-Print Network (OSTI)

as a stepping stone to greater involvement in the fusion sector and, in particular, the commercial opportunities to fusion research. MAST Upgrade will build on this progress, providing a truly world-class device capable

436

EURATOM/CCFE Fusion Association Annual Report  

E-Print Network (OSTI)

European and UK fusion research Public understanding and education outreach Training JET operations Tokamak for clean electricity generation here on earth. Fusion power stations would emit no greenhouse gases

437

INL Fusion Safety Program - Recent Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

T145 (2011) 014051. B. J. Merill, P. W. Humrickhouse, and J. P. Sharpe, "An aerosol resuspension model for MELCOR for fusion," Fusion Engineering and Design 86 (2011) 2686-2689. M....

438

Image fusion for a nighttime driving display  

E-Print Network (OSTI)

An investigation into image fusion for a nighttime driving display application was performed. Most of the image fusion techniques being investigated in this application were developed for other purposes. When comparing the ...

Herrington, William Frederick

2005-01-01T23:59:59.000Z

439

Idaho National Laboratory Fusion Safety Program  

NLE Websites -- All DOE Office Websites (Extended Search)

Contact Information: Brad Merrill 208-526-0395 Email Contact Fusion Safety Program Thermonuclear fusion powers the Sun and the stars and is the most powerful energy source known....

440

An accelerator based fusion product source for development of fusion-plasma diagnostics and education  

E-Print Network (OSTI)

been very instrumental in designing, optimizing, characterizing several types of fusionAn accelerator based fusion product source for development of fusion-plasma diagnostics and education Johan Frenje MIT - Plasma Science and Fusion Center Conference on The Big Impact of Small

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


441

2002 Summer Fusion Study 1 July 19, 2002 2002 Fusion Summer Study  

E-Print Network (OSTI)

2002 Summer Fusion Study 1 July 19, 2002 2002 Fusion Summer Study Snowmass Village, CO. July 19, 2002 For Immediate Release Fusion energy shows great promise to contribute to securing the energy leading scientists from the U.S. and international fusion community concluded a two-week forum assessing

442

HIV-1 Fusion Peptide Decreases Bending Energy and Promotes Curved Fusion Intermediates  

E-Print Network (OSTI)

HIV-1 Fusion Peptide Decreases Bending Energy and Promotes Curved Fusion Intermediates Stephanie in human immunodeficiency virus (HIV) infection is fusion between the viral envelope and the T x-ray scattering is that the bending modulus KC is greatly reduced upon addition of the HIV fusion

Nagle, John F.

443

JET and the Prospect for Nuclear Fusion  

Science Journals Connector (OSTI)

This paper describes the Joint European Torus (JET) device which was built as a European collaboration effort, with the aim of testing the scientific feasibility of producing controlled thermonuclear reactions between light nuclei with a net yield of energy. JET is the largest magnetic confinement machine in the world both in physical size and in the magnitude of the plasma current (5 ? 106 Amperes). The machine came into operation in mid-1983 and has followed the first stages of a planned evolution, in which the performance is progressively increased mainly by adding more heating power and which will culminate in eventual operation in a deuterium-tritium mixture. This will permit study of the plasma performance when there is a substantial power input from the ?-particle fusion products. So far operating in deuterium gas with 8 MW of additional heating by neutral beams, a peak ion temperature of 12 keV has been obtained with a corresponding fusion product (density ? confinement time) of 8 ? 1018 m-3 s. If the same conditions were to be achieved in a deuterium-tritium mixture, then the ratio of thermonuclear power output to the heating power input, Q, would be ~ 0.1. It is expected that following further technical improvements to JET, "scientific breakthrough" (namely Q = 1) will be achieved. The next step after JET will be to study a burning or ignited plasma in which no power input is required because energy losses are balanced by ?-particle heating. The requirements for such an experiment will become increasingly clear as more data is obtained from JET. At present it seems likely that a larger apparatus will be needed with a plasma current capability of 12-15 MA. These requirements for the thermonuclear furnace remain broadly consistent with the known technological constraints on an eventual power reactor.

R J Bickerton

1988-01-01T23:59:59.000Z

444

Vehicle Technologies Office: Key Activities in Vehicles  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Activities in Key Activities in Vehicles to someone by E-mail Share Vehicle Technologies Office: Key Activities in Vehicles on Facebook Tweet about Vehicle Technologies Office: Key Activities in Vehicles on Twitter Bookmark Vehicle Technologies Office: Key Activities in Vehicles on Google Bookmark Vehicle Technologies Office: Key Activities in Vehicles on Delicious Rank Vehicle Technologies Office: Key Activities in Vehicles on Digg Find More places to share Vehicle Technologies Office: Key Activities in Vehicles on AddThis.com... Key Activities Mission, Vision, & Goals Plans, Implementation, & Results Organization & Contacts National Laboratories Budget Partnerships Key Activities in Vehicles We conduct work in four key areas to develop and deploy vehicle technologies that reduce the use of petroleum while maintaining or

445

Fuel Cell Technologies Office: Key Activities  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Activities to Key Activities to someone by E-mail Share Fuel Cell Technologies Office: Key Activities on Facebook Tweet about Fuel Cell Technologies Office: Key Activities on Twitter Bookmark Fuel Cell Technologies Office: Key Activities on Google Bookmark Fuel Cell Technologies Office: Key Activities on Delicious Rank Fuel Cell Technologies Office: Key Activities on Digg Find More places to share Fuel Cell Technologies Office: Key Activities on AddThis.com... Key Activities Plans, Implementation, & Results Accomplishments Organization Chart & Contacts Quick Links Hydrogen Production Hydrogen Delivery Hydrogen Storage Fuel Cells Technology Validation Manufacturing Codes & Standards Education Systems Analysis Contacts Key Activities The Fuel Cell Technologies Office conducts work in several key areas to

446

Pionic Fusion of Heavy Ions  

Science Journals Connector (OSTI)

We report the first experimental observation of the pionic fusion of two heavy ions. The 12C(12C,24Mg)?0 and 12C(12C,24Na)?+ cross sections have been measured to be 208±38 and 182±84 pb, respectively, at Ecm=137MeV. This cross section for heavy-ion pion production, at an energy just 6 MeV above the absolute energy-conservation limit, constrains possible production mechanisms to incorporate the kinetic energy of the entire projectile-target system as well as the binding energy gained in fusion.

D. Horn; G. C. Ball; D. R. Bowman; W. G. Davies; D. Fox; A. Galindo-Uribarri; A. C. Hayes; G. Savard; L. Beaulieu; Y. Larochelle; C. St-Pierre

1996-09-16T23:59:59.000Z

447

Method for vacuum fusion bonding  

DOE Patents (OSTI)

An improved vacuum fusion bonding structure and process for aligned bonding of large area glass plates, patterned with microchannels and access holes and slots, for elevated glass fusion temperatures. Vacuum pumpout of all components is through the bottom platform which yields an untouched, defect free top surface which greatly improves optical access through this smooth surface. Also, a completely non-adherent interlayer, such as graphite, with alignment and location features is located between the main steel platform and the glass plate pair, which makes large improvements in quality, yield, and ease of use, and enables aligned bonding of very large glass structures.

Ackler, Harold D. (Sunnyvale, CA); Swierkowski, Stefan P. (Livermore, CA); Tarte, Lisa A. (Livermore, CA); Hicks, Randall K. (Stockton, CA)

2001-01-01T23:59:59.000Z

448

Fusion bonding and alignment fixture  

DOE Patents (OSTI)

An improved vacuum fusion bonding structure and process for aligned bonding of large area glass plates, patterned with microchannels and access holes and slots, for elevated glass fusion temperatures. Vacuum pumpout of all the components is through the bottom platform which yields an untouched, defect free top surface which greatly improves optical access through this smooth surface. Also, a completely non-adherent interlayer, such as graphite, with alignment and location features is located between the main steel platform and the glass plate pair, which makes large improvements in quality, yield, and ease of use, and enables aligned bonding of very large glass structures.

Ackler, Harold D. (Sunnyvale, CA); Swierkowski, Stefan P. (Livermore, CA); Tarte, Lisa A. (Livermore, CA); Hicks, Randall K. (Stockton, CA)

2000-01-01T23:59:59.000Z

449

European nuclear fusion: Torus takes summer break  

Science Journals Connector (OSTI)

... EUROPE'S collaborative experiment in nuclear fusion, the Joint European Torus (JET), produced "real plasma" for the first time ...

Robert Walgate

1983-08-04T23:59:59.000Z

450

Breakthrough: Neutron Science for the Fusion Mission  

SciTech Connect

How Oak Ridge National Laboratory is helping to solve the world's energy problems through fusion energy research.

McGreevy, Robert

2012-04-24T23:59:59.000Z

451

Fusion Energy: Visions of the Future  

E-Print Network (OSTI)

worldwide · X-ray/neutron applications · US teams at KSU, NSTec 2009: LPP Focus Fusion-1 lab begins

452

Strong plasma screening in thermonuclear reactions: Electron drop model  

Science Journals Connector (OSTI)

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. In the model we assume fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean-field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study the analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate a combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

P. A. Kravchuk and D. G. Yakovlev

2014-01-09T23:59:59.000Z

453

Strong plasma screening in thermonuclear reactions: Electron drop model  

E-Print Network (OSTI)

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. The model assumes fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate the combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

Kravchuk, P A

2014-01-01T23:59:59.000Z

454

Strong plasma screening in thermonuclear reactions: Electron drop model  

E-Print Network (OSTI)

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. The model assumes fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate the combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

P. A. Kravchuk; D. G. Yakovlev

2014-01-11T23:59:59.000Z

455

Applications of high-speed dust injection to magnetic fusion  

SciTech Connect

It is now an established fact that a significant amount of dust is produced in magnetic fusion devices due to plasma-wall interactions. Dust inventory must be controlled, in particular for the next-generation steady-state fusion machines like ITER, as it can pose significant safety hazards and degrade performance. Safety concerns are due to tritium retention, dust radioactivity, toxicity, and flammability. Performance concerns include high-Z impurities carried by dust to the fusion core that can reduce plasma temperature and may even induce sudden termination of the plasma. We have recognized that dust transport, dust-plasma interactions in magnetic fusion devices can be effectively studied experimentally by injection of dust with known properties into fusion plasmas. Other applications of injected dust include diagnosis of fusion plasmas and edge localized mode (ELM)'s pacing. In diagnostic applications, dust can be regarded as a source of transient neutrals before complete ionization. ELM's pacing is a promising scheme to prevent disruptions and type I ELM's that can cause catastrophic damage to fusion machines. Different implementation schemes are available depending on applications of dust injection. One of the simplest dust injection schemes is through gravitational acceleration of dust in vacuum. Experiments at Los Alamos and Princeton will be described, both of which use piezoelectric shakers to deliver dust to plasma. In Princeton experiments, spherical particles (40 micron) have been dropped in a systematic and reproducible manner using a computer-controlled piezoelectric bending actuator operating at an acoustic (0,2) resonance. The circular actuator was constructed with a 2.5 mm diameter central hole. At resonance ({approx} 2 kHz) an applied sinusoidal voltage has been used to control the flux of particles exiting the hole. A simple screw throttle located {approx}1mm above the hole has been used to set the magnitude of the flux achieved for a given voltage. Particle fluxes ranging from a few tens of particle per second up to thousands of particles per second have been achieved using this simple device. To achieve higher dust injection speed, another key consideration is how to accelerate dust at controlled amount. In addition to gravity, other possible acceleration mechanisms include electrostatic, electromagnetic, gas-dragged, plasma-dragged, and laser-ablation-based acceleration. Features and limitations of the different acceleration methods will be discussed. We will also describe laboratory experiments on dust acceleration.

Wang, Zhehui [Los Alamos National Laboratory; Li, Yangfang [Max Planck Institute for Extraterrestrial Physics, Germany

2012-08-08T23:59:59.000Z

456

EPRI Fusion Energy Assessment July 19, 2011  

E-Print Network (OSTI)

Building Blocks Come in Two Types Major Integration Facilities · Nuclear (e.g., ITER, Demo, Fusion NuclearEPRI Fusion Energy Assessment July 19, 2011 Palo Alto, CA Roadmapping an MFE Strategy R.J. Fonck Department of Engineering Physics University of Wisconsin-Madison #12;US MFE PROGRAM CAN MOVE TO A FUSION

457

Fusion power: a challenge for materials science  

Science Journals Connector (OSTI)

...schematic representation of a fusion power plant is shown in figure-1...the harshest environments in fusion power plants are those that...broadly classified into three types. The conditions experienced...materials The first wall of a fusion power plant must contain the...

2010-01-01T23:59:59.000Z

458

Laser Fusion Energy The High Average Power  

E-Print Network (OSTI)

Laser Fusion Energy and The High Average Power Program John Sethian Naval Research Laboratory Dec for Inertial Fusion Energy with lasers, direct drive targets and solid wall chambers Lasers DPPSL (LLNL) Kr posters Snead Payne #12;Laser(s) Goals 1. Develop technologies that can meet the fusion energy

459

Prospects for attractive fusion power systems  

Science Journals Connector (OSTI)

...Robinson Prospects for attractive fusion power systems Farrokh Najmabadi...commercial product. Today's fusion experiments, by their charter...power plant; the International Thermonuclear Experimental Reac- tor (ITER...for rapid maintenance of the fusion core (the so-called mean...

1999-01-01T23:59:59.000Z

460

Improved Image Fusion Using Balanced Multiwavelets  

E-Print Network (OSTI)

Improved Image Fusion Using Balanced Multiwavelets Lahouari Ghouti, Ahmed Bouridane and Mohammad K. Ibrahim Abstract-- This paper presents the use of balanced multi- wavelets for image fusion. The proposed image fusion scheme incorporates the use of balanced multiwavelets transform, which uses multiple

Ghouti, Lahouari

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Fusion Lecture Summary Eugene S. Evans  

E-Print Network (OSTI)

March 31, 2010 2 / 15 #12;National Ignition Facility (NIF) location: Lawrence Livermore National. Evans (2010) Fusion Lecture Summary March 31, 2010 1 / 15 #12;Outline 1 Overview of NIF Specifications Timeline Goals 2 Inertial Confinement Fusion (ICF) 3 Science at NIF 4 Fusion and the Future Laser Inertial

Budker, Dmitry

462

FUSION POWER PLANTS GOALS AND TECHNOLOGICAL CHALLENGES  

E-Print Network (OSTI)

FUSION POWER PLANTS ­ GOALS AND TECHNOLOGICAL CHALLENGES Farrokh Najmabadi Dept. of Electrical & Computer Eng. and Fusion Energy Research Program, University of California, San Diego, La Jolla, CA 92093-0417 619-534-7869 (619-534-7716, Fax) ABSTRACT Fusion is one of a few future power sources with the poten

Najmabadi, Farrokh

463

FUSION CATEGORIES AND MODULE CATEGORIES EVAN JENKINS  

E-Print Network (OSTI)

FUSION CATEGORIES AND MODULE CATEGORIES EVAN JENKINS k is an algebraically closed field of bilinear functors C Ă? D E. 2. Fusion categories Definition. Let C be a tensor/monoidal category. C is called a fusion category if (1) Every object has a left and right dual (2) 1 is simple. Examples (G

Proudfoot, Nicholas

464

Fusion in a Staged Z-pinch  

E-Print Network (OSTI)

York (1978) Teller, E. : Fusion. Academic Press, New York (O R I G I N A L A RT I C L E Fusion in a Staged Z-pinch H.U.implosion the sim- ulated fusion-energy yield is 7.6 MJ,

Rahman, H. U.; Ney, P.; Rostoker, N.; Wessel, F. J.

2009-01-01T23:59:59.000Z

465

A Kinetic model of crack fusion  

Science Journals Connector (OSTI)

......Research Note A Kinetic model of crack fusion Zbigniew Czechowski Institute of Geophysics...presents a kinetic approach to the problem of fusion of cracks. A kinetic equation for the...repetitive episodes of seismicity. crack fusion|kinetic model|seismicity| References......

Zbigniew Czechowski

1991-02-01T23:59:59.000Z

466

EURATOM/CCFE Fusion Association Annual Report  

E-Print Network (OSTI)

potential as an energy source. We are looking forward to JET advancing the records for fusion power for the year 2013. The objective of fusion research is to develop power stations that harness the process that powers the sun for clean electricity generation here on earth. Fusion power stations would emit

467

Directional projection based image fusion quality metric  

Science Journals Connector (OSTI)

In the past few decades, image fusion and its performance evaluation have attracted considerable research attention. However, it is still hard to objectively evaluate the fusion performance due to the diversity of image sources and the motivations for ... Keywords: Image fusion, Local sensitive intensity, Radon transform

Richang Hong, Wenyi Cao, Jianxin Pang, Jianguo Jiang

2014-10-01T23:59:59.000Z

468

Journal of Fusion Energy, Vol. 13, Nos. 2/3, 1994 Fusion Energy Advisory Committee (FEAC): Panel 7 Report  

E-Print Network (OSTI)

.2. A Brief History of Heavy Ion Fusion The heavy ion fusion approach to inertial fusion energy (IFEJournal of Fusion Energy, Vol. 13, Nos. 2/3, 1994 Fusion Energy Advisory Committee (FEAC): Panel 7 Report on Inertial Fusion Energy 1 Ronald Davidson,2 Barrett Ripin, Mohamed Abdou, David E. Baldwin

Abdou, Mohamed

469

Public/private key certification authority and key distribution. Draft  

SciTech Connect

Traditional encryption, which protects messages from prying eyes, has been used for many decades. The present concepts of encryption are built from that heritage. Utilization of modern software-based encryption techniques implies much more than simply converting files to an unreadable form. Ubiquitous use of computers and advances in encryption technology coupled with the use of wide-area networking completely changed the reasons for utilizing encryption technology. The technology demands a new and extensive infrastructure to support these functions. Full understanding of these functions, their utility and value, and the need for an infrastructure, takes extensive exposure to the new paradigm. This paper addresses issues surrounding the establishment and operation of a key management system (i.e., certification authority) that is essential to the successful implementation and wide-spread use of encryption.

Long, J.P.; Christensen, M.J.; Sturtevant, A.P.; Johnston, W.E.

1995-09-25T23:59:59.000Z

470

Magnetic-mirror principle as applied to fusion research  

SciTech Connect

A tutorial account is given of the key physics issues in the confinement of high temperature plasma in magnetic mirror systems. The role of adiabatic invariants and particle drifts and their relationship to equilibrium and stability are discussed, in the context of the various forms of mirror field geometry. Collisional effects and the development and the control of ambipolar potentials are reviewed. The topic of microinstabilities is discussed together with the means for their control. The properties and advantages for fusion power purposes of various special embodiments of the mirror idea, including tandem mirrors, are discussed.

Post, R.F.

1983-08-11T23:59:59.000Z

471

SunShot Initiative: Key Activities  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Activities Key Activities Printable Version Share this resource Send a link to SunShot Initiative: Key Activities to someone by E-mail Share SunShot Initiative: Key Activities on Facebook Tweet about SunShot Initiative: Key Activities on Twitter Bookmark SunShot Initiative: Key Activities on Google Bookmark SunShot Initiative: Key Activities on Delicious Rank SunShot Initiative: Key Activities on Digg Find More places to share SunShot Initiative: Key Activities on AddThis.com... Concentrating Solar Power Photovoltaics Systems Integration Balance of Systems Key Activities Under the SunShot Initiative, the DOE Solar Office issues competitive solicitations that fund selective research projects aimed at transforming the ways the United States generates, stores, and utilizes solar energy.

472

Alternative Fuels Data Center: Key Federal Legislation  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Key Federal Key Federal Legislation to someone by E-mail Share Alternative Fuels Data Center: Key Federal Legislation on Facebook Tweet about Alternative Fuels Data Center: Key Federal Legislation on Twitter Bookmark Alternative Fuels Data Center: Key Federal Legislation on Google Bookmark Alternative Fuels Data Center: Key Federal Legislation on Delicious Rank Alternative Fuels Data Center: Key Federal Legislation on Digg Find More places to share Alternative Fuels Data Center: Key Federal Legislation on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Key Federal Legislation The information below includes a brief chronology and summaries of key federal legislation related to alternative fuels and vehicles, air quality,

473

Proton-proton fusion in lattice effective field theory  

E-Print Network (OSTI)

The proton-proton fusion rate is calculated at low energy in a lattice effective field theory (EFT) formulation. The strong and the Coulomb interactions are treated non-perturbatively at leading order in the EFT. The lattice results are shown to accurately describe the low energy cross section within the validity of the theory at energies relevant to solar physics. In prior work in the literature, Coulomb effects were generally not included in non-perturbative lattice calculations. Work presented here is of general interest in nuclear lattice EFT calculations that involve Coulomb effects at low energy. It complements recent developments of the adiabatic projection method for lattice calculations of nuclear reactions.

Gautam Rupak; Pranaam Ravi

2014-11-10T23:59:59.000Z

474

Plasma physics: The fusion upstarts  

Science Journals Connector (OSTI)

... fusion reactor capable of generating an excess of energy from a sustained burn of its plasma fuel. But it looks set to cost as much as US$50 billion — ... light elements, add heat to strip the electrons from the nuclei and form an ionized plasma, then compress that ...

M. Mitchell Waldrop

2014-07-23T23:59:59.000Z

475

Fusion Ignition Research Experiment Highlights  

E-Print Network (OSTI)

objectives for FIRE are to address the critical burning plasma issues of an attractive magnetic fusion power plant as envisioned by the Advanced Reactor Innovation Evaluation Studies (ARIES). The FIRE Design study. institutions, and is managed through the Virtual Laboratory for Technology. The technical work on FIRE has been

476

The path to fusion power  

Science Journals Connector (OSTI)

...fusion RD, the remaining challenges and...2.1), a gas of deuterium...used to drive turbines and generate...with a half-life of approximately...again the half-life is relatively...small amount of gas (hydrogen or...equipped with turbines, etc., that...R&D, the remaining challenges and...

2007-01-01T23:59:59.000Z

477

The path to fusion power  

Science Journals Connector (OSTI)

...cost-effective neutron and plasma source for a component...at Culham and NSTX at Princeton, are beginning to reach...that requires no driven plasma current to confine the...achieved near fusion plasma conditions at very modest...Experiment (NSTX) at Princeton in the USA also operates...

2010-01-01T23:59:59.000Z

478

The path to fusion power  

Science Journals Connector (OSTI)

...research and development before they...desirable technology for power...Thus, a gas of deuterium...to drive turbines. These turbines...decrease as the technology matures...intensive development of fusion technologies. One contribution...lithium and a turbine-driven...

2010-01-01T23:59:59.000Z

479

Third Edition, Gene Fusion System  

E-Print Network (OSTI)

. Small-Scale Isolation of pGEX DNA .... 9 6. Large-Scale Isolation of pGEX DNA .... 9 Notes on Sequencing ....................................................... 2 pGEX Vectors ............................................. 2 Purification Modules. Screening pGEX Vectors with PCR ..... 10 Purification of GST Fusion Proteins.. 11 8. Preparation

Lai, Zhi-Chun

480

On Thermonuclear Reaction Rates  

E-Print Network (OSTI)

Nuclear reactions govern major aspects of the chemical evolution od galaxies and stars. Analytic study of the reaction rates and reaction probability integrals is attempted here. Exact expressions for the reaction rates and reaction probability integrals for nuclear reactions in the case of nonresonant, modified nonresonant, screened nonresonant and resonant cases are given. These are expressed in terms of H-functions, G-functions and in computable series forms. Computational aspects are also discussed.

H. J. Haubold; A. M. Mathai

1996-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "key fusion reactions" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Lithium-based surfaces controlling fusion plasma behavior at the plasma-material interface  

SciTech Connect

The plasma-material interface and its impact on the performance of magnetically confined thermonuclear fusion plasmas are considered to be one of the key scientific gaps in the realization of nuclear fusion power. At this interface, high particle and heat flux from the fusion plasma can limit the material's lifetime and reliability and therefore hinder operation of the fusion device. Lithium-based surfaces are now being used in major magnetic confinement fusion devices and have observed profound effects on plasma performance including enhanced confinement, suppression and control of edge localized modes (ELM), lower hydrogen recycling and impurity suppression. The critical spatial scale length of deuterium and helium particle interactions in lithium ranges between 5-100 nm depending on the incident particle energies at the edge and magnetic configuration. Lithium-based surfaces also range from liquid state to solid lithium coatings on a variety of substrates (e.g., graphite, stainless steel, refractory metal W/Mo/etc., or porous metal structures). Temperature-dependent effects from lithium-based surfaces as plasma facing components (PFC) include magnetohydrodynamic (MHD) instability issues related to liquid lithium, surface impurity, and deuterium retention issues, and anomalous physical sputtering increase at temperatures above lithium's melting point. The paper discusses the viability of lithium-based surfaces in future burning-plasma environments such as those found in ITER and DEMO-like fusion reactor devices.

Allain, Jean Paul; Taylor, Chase N. [School of Nuclear Engineering, Purdue University, 400 Central Avenue, West Lafayette, Indiana 47907 (United States)

2012-05-15T23:59:59.000Z

482

Renewable Energy Community: Key Elements  

NLE Websites -- All DOE Office Websites (Extended Search)

of Energy of Energy Office of Energy Efficiency & Renewable Energy National Renewable Energy Laboratory Innovation for Our Energy Future A Renewable Energy Community: Key Elements A reinvented community to meet untapped customer needs for shelter and transportation with minimal environmental impacts, stable energy costs, and a sense of belonging N. Carlisle, J. Elling, and T. Penney Technical Report NREL/TP-540-42774 January 2008 NREL is operated by Midwest Research Institute â—Ź Battelle Contract No. DE-AC36-99-GO10337 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute * Battelle

483

Inertial confinement fusion research and development studies. Final report, October 1979-August 1980  

SciTech Connect

These Inertial Confinement Fusion (ICF) research and development studies were selected for structural, thermal, and vacuum pumping analyses in support of the High Yield Lithium Injection Fusion Energy (HYLIFE) concept development. An additional task provided an outlined program plan for an ICF Engineering Test Facility, using the HYLIFE concept as a model, although the plan is generally applicable to other ICF concepts. The HYLIFE is one promising type of ICF concept which features a falling array of liquid lithium jets. These jets surround the fusion reaction to protect the first structural wall (FSW) of the vacuum chamber by absorbing the fusion energy, and to act as the tritium breeder. The fusion energy source is a deuterium-tritium pellet injected into the chamber every second and driven by laser or heavy ion beams. The studies performed by Grumman have considered the capabilities of specific HYLIFE features to meet life requirements and the requirement to recover to preshot conditions prior to each subsequent shot. The components under investigation were the FSW which restrains the outward motion of the liquid lithium, the nozzle plate which forms the falling jet array, the graphite shield which is in direct top view of the fusion pellet, and the vacuum pumping system. The FSW studies included structural analysis, and definition of an experimental program to validate computer codes describing lithium motion and the resulting impact on the wall.

Bullis, R.; Finkelman, M.; Leng, J.; Luzzi, T.; Ojalvo, I.; Powell, E.; Sedgley, D.

1980-08-01T23:59:59.000Z

484

American Fusion News | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

American Fusion News American Fusion News General Atomics (GA) December 4, 2012 The Scorpion's Strategy: "Catch and Subdue" December 4, 2012 Frozen Bullets Tame Unruly Edge Plasmas in Fusion Experiment February 15, 2012 General Atomics (GA) Fusion News: A New Spin on Understanding Plasma Confinement See All Massachusetts Institute of Technology (MIT) April 5, 2013 Applying physics, teamwork to fusion energy science February 22, 2013 A Tour of Plasma Physics in Downtown Cambridge December 4, 2012 Placing Fusion Power on a Pedestal September 21, 2012 MASSACHUSETTS INSTITUTUE OF TECHNOLOGY See All National Ignition Facility February 22, 2013 Summary of Assessment of Prospects for Inertial Fusion Energy February 16, 2012 National Ignition Facility (NIF): Under Pressure: Ramp-Compression Smashes

485

E-Print Network 3.0 - advanced fusion material Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Physics and Fusion 5 Fusion Energy Program Presentation to Summary: International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

486

E-Print Network 3.0 - advanced deuterium fusion Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Physics and Fusion 2 Fusion Energy Program Presentation to Summary: International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

487

Nuclear fusion of deuterons with light nuclei driven by Coulomb explosion of nanodroplets  

Science Journals Connector (OSTI)

Theoretical-computational studies of table-top laser-driven nuclear fusion of high energy (up to 15 MeV) deuterons with 7Li 6Li T and D demonstrate the attainment of high fusion yields. The reaction design constitutes a source of Coulomb exploding deuterium nanodroplets driven by an ultraintense near-infrared femtosecond Gaussian laser pulse (peak intensity 2?×?1018–5?×?1019?W cm?2) and a solid hollow cylindrical target containing the second reagent. The exploding nanodroplets source is characterized by the deuteron kinetic energies their number and the laser energy absorbed by a nanodroplet. These were computed by scaled electron and ion dynamics simulations which account for intra-nanodroplet laser intensity attenuation and relativistic effects. The fusion yields Y are determined by the number of the source deuterons and by the reaction probability. When laser intensity attenuation is weak within a single nanodroplet and throughout the nanodroplets assembly Y exhibits a power law increase with increasing the nanodroplet size. Y is maximized for the nanodroplet size and laser intensity corresponding to the "transition" between the weak and the strong intensity attenuation domains. The dependence of Y on the laser pulse energyW scales as W 2 for weak assembly intensity attenuation and as W for strong assembly intensity attenuation. This reaction design attains the highest table-top fusion efficiencies (up to 4?×?109?J?1 per laser pulse) obtained up to date.

Shlomo Ron; Isidore Last; Joshua Jortner

2012-01-01T23:59:59.000Z

488

Linear Momentum and Angular-Momentum Transfer in the Reactions of O-16 with Sm-154  

E-Print Network (OSTI)

between projectile-like fragments or heavy residues and their as- sociated y rays, the angular momentum transfers for a variety of incomplete fusion reactions of 180 and 310 MeV ' 0 with ' Sm have been derived. At the higher energy, the correlation... techniques may be utilized. For example, the measurements of fission cross sections in concert with momentum transfer is one method which provides some information on the partial waves involved in incomplete fusion. Such an approach has been fol- lowed...

Namboodiri, M. N.; Choudhury, R. K.; Alder, L.; Bronson, J. D.; Fabris, D.; Garg, U.; Gonthier, P. L.; Hagel, K.; Haenni, DR; Lui, YW; Majka, Z.; Mouchaty, G.; Murakami, T.; Natowitz, J. B.; Nebbia, G.; Schmitt, R. P.; Simon, S.; Sullivan, J. P.; Youngblood, David H.

1987-01-01T23:59:59.000Z

489

T-661: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important Update  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important 1: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important Update T-661: ColdFusion Security Hotfix | APSB11-14, ColdFusion Important Update July 5, 2011 - 7:57am Addthis PROBLEM: ColdFusion 9.0.1, ColdFusion 9, ColdFusion 8.0.1, and ColdFusion 8 are affected with vulnerabilities mentioned in the security bulletins APSB11-14 and APSB11-15. ColdFusion 9.0.1, 9.0, 8.0.1 and 8.0 for Windows, Macintosh and UNIX (APSB11-14); ColdFusion integrated/installed with LCDS (APSB11-15) PLATFORM: ColdFusion 9.0.1, 9.0, 8.0.1 and 8.0 for Windows, Macintosh and UNIX ABSTRACT: Vulnerabilities have been identified in ColdFusion 9.0.1 and earlier versions for Windows, Macintosh and UNIX. These vulnerabilities could lead to a cross-site request forgery (CSRF) or a remote denial-of-service (DoS).

490

A Virtualized Computing Platform For Fusion Control Systems  

SciTech Connect

The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory is a stadium-sized facility that contains a 192-beam, 1.8-Megajoule, 500-Terawatt, ultraviolet laser system together with a 10-meter diameter target chamber with room for multiple experimental diagnostics. NIF is the world's largest and most energetic laser experimental system, providing a scientific center to study inertial confinement fusion (ICF) and matter at extreme energy densities and pressures. NIF's laser beams are designed to compress fusion targets to conditions required for thermonuclear burn, liberating more energy than required to initiate the fusion reactions. 2,500 servers, 400 network devices and 700 terabytes of networked attached storage provide the foundation for NIF's Integrated Computer Control System (ICCS) and Experimental Data Archive. This talk discusses the rationale & benefits for server virtualization in the context of an operational experimental facility, the requirements discovery process used by the NIF teams to establish evaluation criteria for virtualization alternatives, the processes and procedures defined to enable virtualization of servers in a timeframe that did not delay the execution of experimental campaigns and the lessons the NIF teams learned along the way. The virtualization architecture ultimately selected for ICCS is based on the Open Source Xen computing platform and 802.1Q open networking standards. The specific server and network configurations needed to ensure performance and high availability of the control system infrastructure will be discussed.

Frazier, T; Adams, P; Fisher, J; Talbot, A

2011-03-18T23:59:59.000Z

491

Fusion proton diagnostic for the C-2 field reversed configuration  

SciTech Connect

Measurements of the flux of fusion products from high temperature plasmas provide valuable insights into the ion energy distribution, as the fusion reaction rate is a very sensitive function of ion energy. In C-2, where field reversed configuration plasmas are formed by the collision of two compact toroids and partially sustained by high power neutral beam injection [M. Binderbauer et al., Phys. Rev. Lett. 105, 045003 (2010); M. Tuszewski et al., Phys. Rev. Lett. 108, 255008 (2012)], measurements of DD fusion neutron flux are used to diagnose ion temperature and study fast ion confinement and dynamics. In this paper, we will describe the development of a new 3 MeV proton detector that will complement existing neutron detectors. The detector is a large area (50?cm{sup 2}), partially depleted, ion implanted silicon diode operated in a pulse counting regime. While the scintillator-based neutron detectors allow for high time resolution measurements (?100 kHz), they have no spatial or energy resolution. The proton detector will provide 10 cm spatial resolution, allowing us to determine if the axial distribution of fast ions is consistent with classical fast ion theory or whether anomalous scattering mechanisms are active. We will describe in detail the diagnostic design and present initial data from a neutral beam test chamber.

Magee, R. M., E-mail: rmagee@trialphaenergy.com; Clary, R.; Korepanov, S.; Smirnov, A.; Garate, E.; Knapp, K. [Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688 (United States); Tkachev, A. [Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)

2014-11-15T23:59:59.000Z

492

Aneutronic H + {sup 11}B nuclear fusion driven by Coulomb explosion of hydrogen nanodroplets  

SciTech Connect

We consider a reaction design for table-top nuclear fusion between two distinct nuclei, with high-energy nuclei being produced by a Coulomb explosion (CE) of homonuclear nanodroplets of one reagent reacting with a solid target of a second reagent. This scheme was applied for a theoretical-computational study of the table-top aneutronic p+{sup 11}B{yields}3{alpha}+8.7 MeV reaction generated by a source of high-energy (0.3-6 MeV) protons produced by a CE of hydrogen nanodroplets driven by ultra-intense, femtosecond, near-infrared laser pulses and which penetrate into a solid {sup 11}B target. The averaged reaction probability and the yield for {sup 11}B(p,{alpha})2{alpha} fusion were calculated from the energy-dependent reaction probability, which was obtained from the ratio of the large fusion cross sections and the stopping power of the protons, and by the proton kinetic energy distribution function, which was obtained from scaled electron and ion dynamics simulations. The fusion yields were determined in the nanodroplet size range and in the laser intensity domain, satisfying the conditions of weak laser intensity attenuation within a single nanodroplet and within an assembly of exploding nanodroplets in the macroscopic plasma filament. The highest values of the fusion yield of 10{sup 8} per laser pulse were attained for the largest nanodroplets with initial radii of 200 nm at the laser peak intensity of 10{sup 19} W cm{sup -2}. The {sup 11}B(p,{alpha})2{alpha} fusion yields for the exploding hydrogen nanodroplet source-solid {sup 11}B cylindrical target are higher by three to four orders of magnitude than the yields of 10{sup 4}-10{sup 5} per laser pulse from a laser-irradiated mixed boron-hydrocarbon solid and from a CE of boron-hydrogen heteronuclear nanodroplets. The high efficiency for fusion within the exploding nanodroplets source-cylindrical solid target design provides guidelines for the optimization of yields for table-top nuclear fusion.

Last, Isidore; Ron, Shlomo; Jortner, Joshua [School of Chemistry, Tel-Aviv University, Ramat Aviv, Tel Aviv 69978 (Israel)

2011-04-15T23:59:59.000Z

493

Analysis of Data Fusion Methods in Virtual Screening:? Similarity and Group Fusion  

Science Journals Connector (OSTI)

We also develop a customized fusion rule, which provides an estimate of the optimal possible result for fusing multiple searches of a specific database; this shows that similarity fusion can, in principle, achieve retrieval enhancements even if this is not achieved in practice with current fusion rules. ... Studies of data fusion applied to similarity searching fall into three types. ... In similarity fusion, of type (i) or (ii) discussed in the Introduction, the values obtained using two or more measures are combined using one of several fusion rules. ...

Martin Whittle; Valerie J. Gillet; Peter Willett; Jens Loesel

2006-08-29T23:59:59.000Z

494

Investigation of condensed matter fusion  

SciTech Connect

Work on muon-catalyzed fusion led to research on a possible new type of fusion occurring in hydrogen isotopes embedded in metal lattices. While the nuclear-product yields observed to date are so small as to require careful further checking, rates observed over short times appear sufficiently large to suggest that significant neutrons and triton yields could be realized -- if the process could be understood and controlled. During 1990, we have developed two charged-particle detection systems and three new neutron detectors. A segmented, high-efficiency neutron counter was taken into 600 m underground in a mine in Colorado for studies out of the cosmic-ray background. Significant neutron emissions were observed in this environment in both deuterium-gas-loaded metals and in electrolytic cells, confirming our earlier observations.

Jones, S.E.; Berrondo, M.; Czirr, J.B.; Decker, D.L.; Harrison, K.; Jensen, G.L.; Palmer, E.P.; Rees, L.B.; Taylor, S.; Vanfleet, H.B.; Wang, J.C.; Bennion, D.N.; Harb, J.N.; Pitt, W.G.; Thorne, J.M.; Anderson, A.N.; McMurtry, G.; Murphy, N.; Goff, F.E.

1990-12-01T23:59:59.000Z

495

Inertial Confinement Fusion: Quarterly report, April-June 1996  

SciTech Connect

The lead article, `Ion-beam propagation in a low-density reactor chamber for heavy-ion inertial fusion` (p. 89), explores the ability of heavy-ion beams to be adequately transported and focused in an IFE reactor. The next article, `Efficient production and applications of 2- to 10-keV x rays by laser-heated underdense radiators` (p. 96), explores the ability of the NIF to produce sufficient high-energy x rays for diagnostic backlighting, target preheating, or uniform irradiation of large test objects for Nuclear Weapons Effects Testing. For capsule implosion experiments, the increasing energies and distances involved in the NIF compared to Nova require the development of new diagnostics methods. The article `Fusion reaction-rate measurements--Nova and NIF` (p. 115) first reviews the use of time-resolved neutron measurements on Nova to monitor fusion burn histories and then explores the limitations of that technique, principally Doppler broadening, for the proposed NIF. It also explores the use of gamma rays on Nova, thereby providing a proof-of-principle for using gamma rays for monitoring fusion burn histories on the NIF. The articles `The energetics of gas-filled hohlraums` (p. 110) and `Measurements of laser- speckle-induced perturbations in laser-driven foils` (p. 123) report measurements on Nova of two important aspects of implosion experiments. The first characterizes the amount of energy lost from a hohlraum by stimulated Brillouin and Raman scattering as a function of gas fill and laser-beam uniformity. The second of these articles shows that the growth of density nonuniformities implanted on smooth capsule surfaces by laser speckle can be correlated with the effects of physical surface roughness. The article `Laser-tissue interaction modeling with the LATIS computer program` (p. 103) explores the use of modeling to enhance the effectiveness--maximize desired effects and minimize collateral damage--of lasers for medical purposes.

Correll, D.

1996-06-01T23:59:59.000Z

496

Management strategies for endangered Florida Key deer  

E-Print Network (OSTI)

Urban development is of particular concern in the management of endangered Key deer (Odocoileous virginianus clavium) because highway mortality is the greatest single cause of deer mortality (? 50%), and the rural community of Big Pine Key, Florida...

Peterson, Markus Nils

2004-09-30T23:59:59.000Z

497

Fusion Power Associates Annual Meeting  

E-Print Network (OSTI)

to that obtained on JET. Summary #12;Collaborators V. N. Goncharov, R. Betti,T. R. Boehly,T. J. B. Collins, R. S-relevant conditions E18399 M.C. Hermann, M.Tabak, and J. D. Lindl, Nucl. Fusion 41, 99 (2001). C. D. Zhou and R. Betti. D. Zhou and R. Betti, Phys. Plasmas 14, 072703 (2007). 0.05 2.0 2.5 3.0 Implosion velocity (�107 cm

498

Theory of nuclear reactions  

SciTech Connect

The book presents a theory of nuclear reaction. An account is given of the nonrelativistic nuclear reaction theory. The R - matrix description of nuclear reactions is considered and the dispersion method is formulated. Mechanisms of nuclear reactions and their relationship are studied in detail. Attention is paid to nuclear reactions involving the compound nuclear formation and to direct nuclear processes. The optical model the diffraction approach and high - energy diffraction nuclear processes involving composite particles are discussed.

Sitenko, A.G.

1990-01-01T23:59:59.000Z

499

Electron assisted $dd$ reactions in metals  

E-Print Network (OSTI)

The electron assisted low energy $dd$ reactions in deuterized metals are investigated. It is shown that if a metal is irradiated with slow, free deuterons then the $e+d+d\\rightarrow e^{\\prime }+p+t$ and $e+d+d\\rightarrow e^{\\prime }+n+$ $^{3}He$\\ electron assisted $dd$ processes will have measurable probabilities even in the case of slow deuterons. The cross sections and the yields in an irradiated sample are determined. The results are associated with the so called anomalous screening effect. It is concluded that the electron $dd$ processes have to be taken into account when evaluating the experimental data of low energy fusion reactions in metals.

Péter Kálmán; Tamás Keszthelyi

2014-02-19T23:59:59.000Z

500

Alternate Alpha Induced Reactions for NIF Radiochemistry  

SciTech Connect

Radiochemical analysis of NIF capsule residues has been identified as a potential diagnostic of NIF capsule performance. In particular, alpha-induced nuclear reactions that occur on tracer elements added to the NIF capsule have been shown through simulation to be a very sensitive diagnostic for mix. The short range of the alpha particles makes them representative of the hot spot where they are created through the fusion of deuterium and tritium. Reactions on elements doped into the innermost part of the capsule ablator would therefore be sensitive to material that had mixed into the hot spot. Radiochemical determinations of activated detector elements may perhaps be the only true measure of mix that occurs in a NIF capsule, particularly in cases when the capsule fails.

Shaughnessy, D A; Moody, K J; Bernstein, L A

2010-02-26T23:59:59.000Z