National Library of Energy BETA

Sample records for fusion reactions work

  1. How Fusion Energy Works

    Broader source: Energy.gov [DOE]

    Fusion energy is the energy source of the sun and all of the stars. As part of How Energy Works, we'll cover everything from fuel sources to plasma physics and beyond.

  2. Method of controlling fusion reaction rates

    DOE Patents [OSTI]

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

    1988-01-01

    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.

  3. Method of controlling fusion reaction rates

    DOE Patents [OSTI]

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

    1983-05-09

    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.

  4. Systematics of fusion probability in "hot" fusion reactions

    E-Print Network [OSTI]

    Ning Wang; Junlong Tian; Werner Scheid

    2011-12-28

    The fusion probability in "hot" fusion reactions leading to the synthesis of super-heavy nuclei is investigated systematically. The quasi-fission barrier influences the formation of the super-heavy nucleus around the "island of stability" in addition to the shell correction. Based on the quasi-fission barrier height obtained with the Skyrme energy-density functional, we propose an analytical expression for the description of the fusion probability, with which the measured evaporation residual cross sections can be reproduced acceptably well. Simultaneously, some special fusion reactions for synthesizing new elements 119 and 120 are studied. The predicted evaporation residual cross sections for 50Ti+249Bk are about 10-150fb at energies around the entrance-channel Coulomb barrier. For the fusion reactions synthesizing element 120 with projectiles 54Cr and 58Fe, the cross sections fall to a few femtobarns which seems beyond the limit of the available facilities.

  5. Observation of incomplete fusion reactions at l < l {sub crit}

    SciTech Connect (OSTI)

    Yadav, Abhishek Sharma, Vijay R. Singh, Devendra P. Unnati,; Singh, B. P.; Prasad, R.; Singh, Pushpendra P.; Bala, Indu; Kumar, R.; Muralithar, S.; Singh, R. P.; Sharma, M. K.

    2014-08-14

    In order to understand the presence of incomplete fusion at low energies i.e. 4-7MeV/nucleon and also to study its dependence on various entrance-channel parameters, the two type of measurements (i) excitation function for {sup 12}C+{sup 159}Tb, and (ii) forward recoil ranges for {sup 12}C+{sup 159}Tb systems have been performed. The experimentally measured excitation functions have been analyzed within the framework of compound nucleus decay using statistical model code PACE4. Analysis of data suggests the production of xn/px)n-channels via complete fusion, as these are found to be well reproduced by PACE4 predictions, while, a significant enhancement in the excitation functions of ?-emitting channels has been observed over the theoretical ones, which has been attributed due to the incomplete fusion processes. Further, the incomplete fusion events observed in case of forward recoil range measurements have been explained on the basis of the breakup fusion model, where these events may be attributed to the fusion of {sup 8}Be and/or {sup 4}He from {sup 12}C projectile to the target nucleus. In the present work, the SUMRULE model calculations are found to highly underestimate the observed incomplete fusion cross-sections which indicate that the l-values lower than l {sub crit} (limit of complete fusion) significantly contribute to the incomplete fusion reactions.

  6. Measurement of the Fusion Probability, PCN, for Hot Fusion Reactions

    E-Print Network [OSTI]

    R. Yanez; W. Loveland; J. S. Barrett; L. Yao; B. B. Back; S. Zhu; T. L. Khoo

    2013-06-17

    Background: The cross section for forming a heavy evaporation residue in fusion reactions depends on the capture cross section, the fusion probability, PCN, i.e., the probability that the projectile-target system will evolve inside the fission saddle point to form a completely fused system rather than re-separating (quasifission), and the survival of the completely fused system against fission. PCN is the least known of these quantities. Purpose: To measure PCN for the reaction of 101.2 MeV 18O, 147.3 MeV 26Mg, 170.9 MeV 30Si and 195.3 MeV 36S with 197Au. Methods: We measured the fission fragment angular distributions for these reactions and used the formalism of Back to deduce the fusion-fission and quasifission cross sections. From these quantities we deduced PCN for each reaction. Results: The values of PCN for the reaction of 101.2 MeV 18O, 147.3 MeV 26Mg, 170.9 MeV 30Si and 195.3 MeV 36S with 197Au are 0.66, 1.00, 0.06, 0.13, respectively. Conclusions: The new measured values of PCN agree roughly with the semi-empirical system- atic dependence of PCN upon fissility for excited nuclei.

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

    E-Print Network [OSTI]

    Dragojevic, I.

    2008-01-01

    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

  8. Fusion reactions in multicomponent dense matter

    E-Print Network [OSTI]

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

    2006-08-23

    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. (2005) for the one-component plasma of nuclei, to the multi-component 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 multi-component matter (a regular lattice, a uniform mix, etc.). We apply the results to study nuclear burning in a carbon_12-oxygen_16 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 CO lattice can strongly suppress carbon ignition in white dwarf cores and neutron star crusts at densities > 3e9 g cm^{-3} and temperatures T<1e8 K.

  9. Fusion Technology Working Group Presented by

    E-Print Network [OSTI]

    California at Los Angeles, University of

    Snowmass Fusion Technology Working Group Summary Presented by M. Abdou, S. Milora Snowmass July 23, 1999 #12;Technology Working Group Subgroup # 1 Subgroup # 2 Solid Walls Ulrickson / Mattas Liquid Walls / Ying Chamber Technology Abdou / Ulrickson Heating/CD/Fueling Swain / Temkin Magnets Schultz / Woolley

  10. Microdroplet fusion mass spectrometry for fast reaction kinetics

    E-Print Network [OSTI]

    Zare, Richard N.

    Microdroplet fusion mass spectrometry for fast reaction kinetics Jae Kyoo Leea,b , Samuel Kima,b,1 investigated the fusion of high-speed liquid droplets as a way to record the kinetics of liquid-phase chemical between the mass spec- trometer inlet and the droplet fusion center. Fused droplet trajec- tories were

  11. Measuring time of flight of fusion products in an inertial electrostatic confinement fusion device for spatial profiling of fusion reactions

    SciTech Connect (OSTI)

    Donovan, D. C.; Boris, D. R.; Kulcinski, G. L.; Santarius, J. F.; Piefer, G. R.

    2013-03-15

    A new diagnostic has been developed that uses the time of flight (TOF) of the products from a nuclear fusion reaction to determine the location where the fusion reaction occurred. The TOF diagnostic uses charged particle detectors on opposing sides of the inertial electrostatic confinement (IEC) device that are coupled to high resolution timing electronics to measure the spatial profile of fusion reactions occurring between the two charged particle detectors. This diagnostic was constructed and tested by the University of Wisconsin-Madison Inertial Electrostatic Confinement Fusion Group in the IEC device, HOMER, which accelerates deuterium ions to fusion relevant energies in a high voltage ({approx}100 kV), spherically symmetric, electrostatic potential well [J. F. Santarius, G. L. Kulcinski, R. P. Ashley, D. R. Boris, B. B. Cipiti, S. K. Murali, G. R. Piefer, R. F. Radel, T. E. Radel, and A. L. Wehmeyer, Fusion Sci. Technol. 47, 1238 (2005)]. The TOF diagnostic detects the products of D(d,p)T reactions and determines where along a chord through the device the fusion event occurred. The diagnostic is also capable of using charged particle spectroscopy to determine the Doppler shift imparted to the fusion products by the center of mass energy of the fusion reactants. The TOF diagnostic is thus able to collect spatial profiles of the fusion reaction density along a chord through the device, coupled with the center of mass energy of the reactions occurring at each location. This provides levels of diagnostic detail never before achieved on an IEC device.

  12. Fusion-fission reactions with modified Woods-Saxon potential

    E-Print Network [OSTI]

    Ning Wang; Kai Zhao; Werner Scheid; Xizhen Wu

    2007-12-15

    A modified Woods-Saxon potential model is proposed for a unified description of the entrance channel fusion barrier and the fission barrier of fusion-fission reactions based on the Skyrme energy-density functional approach. The fusion excitation functions of 120 reactions have been systematically studied. The fusion (capture) cross sections are well described with the calculated potential and an empirical barrier distribution. Incorporating a statistical model (HIVAP code) for describing the decay of the compound nucleus, the evaporation residue (and fission) cross sections of 51 fusion-fission reactions have been systematically investigated. Optimal values of some key parameters of the HIVAP code are obtained based on the experimental data of these reactions. The experimental data are reasonably well reproduced by the calculated results. The upper and lower confidence limits of the systematic errors of the calculated results are given.

  13. Applications of Skyrme energy-density functional to fusion reactions spanning the fusion barriers

    E-Print Network [OSTI]

    Min Liu; Ning Wang; Zhuxia Li; Xizhen Wu; Enguang Zhao

    2006-01-25

    The Skyrme energy density functional has been applied to the study of heavy-ion fusion reactions. The barriers for fusion reactions are calculated by the Skyrme energy density functional with proton and neutron density distributions determined by using restricted density variational (RDV) method within the same energy density functional together with semi-classical approach known as the extended semi-classical Thomas-Fermi method. Based on the fusion barrier obtained, we propose a parametrization of the empirical barrier distribution to take into account the multi-dimensional character of real barrier and then apply it to calculate the fusion excitation functions in terms of barrier penetration concept. A large number of measured fusion excitation functions spanning the fusion barriers can be reproduced well. The competition between suppression and enhancement effects on sub-barrier fusion caused by neutron-shell-closure and excess neutron effects is studied.

  14. Stimulated Emission of Radiation in a Nuclear Fusion Reaction

    E-Print Network [OSTI]

    Michael Duren

    1999-04-06

    This letter claims that process of stimulated emission of radiation can be used to induce a fusion reaction in a HD molecule to produce Helium-3. An experimental set-up for this reaction is presented. It is proposed to study the technical potential of this reaction as an energy amplifier.

  15. Transfer/Breakup Channel Couplings in Sub-barrier Fusion Reactions

    E-Print Network [OSTI]

    C. Beck

    2012-10-22

    With the recent availability of state-of-the-art radioactive ion beams, there has been a renew interest in the investigation of nuclear reactions with heavy ions near the Coulomb barrier. The role of inelastic and transfer channel couplings in fusion reactions induced by stable heavy ions can be revisited. Detailed Analysis of recent experimental fusion cross sections by using standard coupled-channel calculations is first discussed. Multi-neutron transfer effects are introduced in the fusion process below the Coulomb barrier by analyzing 32S+90,96Zr as benchmark reactions. The enhancement of fusion cross sections for 32S+96Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutron-transfer channels following the Zagrebaev semi-classical model. Similar effects for 40Ca+90Zr and 40Ca+96Zr fusion excitation functions are found. The breakup coupling in both the elastic scattering and in the fusion process induced by weakly bound stable projectiles is also shown to be crucial. In the second part of this work, full coupled-channel calculations of the fusion excitation functions are performed by using the breakup coupling for the more neutron-rich reaction and for the more weakly bound projectiles. we clearly demonstrate that Continuum-Discretized Coupled-Channel calculations are capable to reproduce the fusion enhancement from the breakup coupling in 6Li+59Co.

  16. Screened Coulomb potentials for astrophysical nuclear fusion reactions

    E-Print Network [OSTI]

    Theodore E. Liolios

    2000-09-04

    The electron-screening acceleration of laboratory fusion reactions at astrophysical energies is an unsolved problem of great importance to astrophysics. That effect is modeled here by considering the fusion of hydrogen-like atoms whose electron probability density is used in Poisson's equation in order to derive the corresponding screened Coulomb potential energy. That way atomic excitations and deformations of the fusing atoms can be taken into account. Those potentials are then treated semiclassically in order to obtain the screening (accelerating) factor of the reaction. By means of the proposed model the effect of a superstrong magnetic field on laboratory Hydrogen fusion reactions is investigated here for the first time showing that, despite the considerable increase in the cross section of the $% dd$ reaction, the $pp$ reaction is still too slow to justify experimentation. The proposed model is finally applied on the $H^{2}(d,p) H^{3}$ fusion reaction describing satisfactorily the experimental data although some ambiguity remains regarding the molecular nature of the deuteron target. Notably, the present method gives a sufficiently high screening energy for Hydrogen fusion reactions so that the take-away energy of the spectator nucleus can also be taken into account.

  17. Subbarrier fusion reactions and many-particle quantum tunneling

    E-Print Network [OSTI]

    K. Hagino; N. Takigawa

    2012-10-17

    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.

  18. Pairing Effects in Nuclear Fusion Reaction

    E-Print Network [OSTI]

    Shuichiro Ebata; Takashi Nakatsukasa

    2013-09-29

    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.

  19. Formation of superheavy nuclei in cold fusion reactions

    E-Print Network [OSTI]

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

    2007-01-01

    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.

  20. Formation of superheavy nuclei in cold fusion reactions

    E-Print Network [OSTI]

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

    2007-10-17

    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.

  1. Ab initio calculations of light-ion fusion reactions

    SciTech Connect (OSTI)

    Hupin, G.; Quaglioni, S.; Navratil, P.

    2012-10-20

    The exact treatment of nuclei starting from the constituent nucleons and the fundamental interactions among them has been a long-standing goal in nuclear physics. Above all nuclear scattering and reactions, which require the solution of the many-body quantum-mechanical problem in the continuum, represent an extraordinary theoretical as well as computational challenge for ab initio approaches. The ab initio No-Core Shell Model/Resonating-Group Method (NCSM/RGM) complements a microscopic cluster technique with the use of realistic interactions, and a microscopic and consistent description of the nucleon clusters. This approach is capable of describing simultaneously both bound and scattering states in light nuclei. Recent applications to light nuclei scattering and fusion reactions relevant to energy production in stars and Earth based fusion facilities, such as the deuterium-{sup 3}He fusion, are presented. Progress toward the inclusion of the three nucleon force into the formalism is outlined.

  2. Effect of pairing on transfer and fusion reactions

    E-Print Network [OSTI]

    Scamps, Guillaume

    2014-01-01

    In the present contribution, the effect of pairing on nuclear transfer and fusion reactions close to the Coulomb barrier is discussed. A Time-Dependent Hartree-Fock + BCS (TDHF+BCS) microscopic theory has been developed to incorporate pairing. One- and two-particle transfer probabilities can be obtained showing the importance of pairing. The calculated transfer probabilities are compared to the recent experimental results obtained for the $^{96}$Zr+$^{40}$Ca. Reactions involving the $^{18}$O with lead isotopes are also presented, that are also of current experimental interest. Finally, a study of the fusion barrier height predicted with the TDHF+BCS theory is compared to the experimental values for the $^{40,44,48}$Ca+$^{40}$Ca reactions.

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

    SciTech Connect (OSTI)

    Cap, T.; Siwek-Wilczynska, K.; Wilczynski, J.

    2011-05-15

    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.

  4. DEUTERIUM BEAM SPECIES MEASURED BY FUSION REACTIONS IN THE NEUTRALIZER

    E-Print Network [OSTI]

    Smith, R.R.

    2010-01-01

    Research, Office of Fusion Energy, Development S. TechnologyResearch, Office of Fusion Energy, Development & Technology

  5. Complex signal amplitude analysis for complete fusion nuclear reaction products

    E-Print Network [OSTI]

    Yu. S. Tsyganov

    2015-06-07

    A complex analysis has been performed on the energy amplitude signals corresponding to events of Z=117 element measured in the 249Bk+48Ca complete fusion nuclear reaction. These signals were detected with PIPS position sensitive detector. The significant values of pulse height defect both for recoils (ER) and fission fragments (FF) were measured. Comparison with the computer simulations and empirical formulae has been performed both for ER and FF signals.

  6. Complex signal amplitude analysis for complete fusion nuclear reaction products

    E-Print Network [OSTI]

    Tsyganov, Yu S

    2015-01-01

    A complex analysis has been performed on the energy amplitude signals corresponding to events of Z=117 element measured in the 249Bk+48Ca complete fusion nuclear reaction. These signals were detected with PIPS position sensitive detector. The significant values of pulse height defect both for recoils (ER) and fission fragments (FF) were measured. Comparison with the computer simulations and empirical formulae has been performed both for ER and FF signals.

  7. PHYSICAL REVIEW C 80, 014611 (2009) Nuclear fusion reaction rates for strongly coupled ionic mixtures

    E-Print Network [OSTI]

    2009-01-01

    PHYSICAL REVIEW C 80, 014611 (2009) Nuclear fusion reaction rates for strongly coupled ionic.014611 PACS number(s): 26.30.-k I. INTRODUCTION Nuclear fusion in dense stellar matter is most important the nuclear interaction. We will mostly focus on the Coulomb barrier penetration problem. Fusion reactions

  8. Nuclear fusion in dense matter: Reaction rate and carbon burning

    E-Print Network [OSTI]

    L. R. Gasques; A. V. Afanasjev; E. F. Aguilera; M. Beard; L. C. Chamon; P. Ring; M. Wiescher; D. G. Yakovlev

    2005-06-16

    In this paper we analyze the nuclear fusion rate between equal nuclei for all five different nuclear burning regimes in dense matter (two thermonuclear regimes, two pycnonuclear ones, and the intermediate regime). The rate is determined by Coulomb barrier penetration in dense environments and by the astrophysical S-factor at low energies. We evaluate previous studies of the Coulomb barrier problem and propose a simple phenomenological formula for the reaction rate which covers all cases. The parameters of this formula can be varied, taking into account current theoretical uncertainties in the reaction rate. The results are illustrated for the example of the ^{12}C+^{12}C fusion reaction. This reaction is very important for the understanding of nuclear burning in evolved stars, in exploding white dwarfs producing type Ia supernovae, and in accreting neutron stars. The S-factor at stellar energies depends on a reliable fit and extrapolation of the experimental data. We calculate the energy dependence of the S-factor using a recently developed parameter-free model for the nuclear interaction, taking into account the effects of the Pauli nonlocality. For illustration, we analyze the efficiency of carbon burning in a wide range of densities and temperatures of stellar matter with the emphasis on carbon ignition at densities rho > 10^9 g/cc.

  9. PHYSICAL REVIEW C 72, 025806 (2005) Nuclear fusion in dense matter: Reaction rate and carbon burning

    E-Print Network [OSTI]

    2005-01-01

    PHYSICAL REVIEW C 72, 025806 (2005) Nuclear fusion in dense matter: Reaction rate and carbon August 2005) In this paper we analyze the nuclear fusion rates among equal nuclei for all five different.025806 PACS number(s): 26.50.+x, 25.60.Pj, 97.10.Cv I. INTRODUCTION We study nuclear fusion rates of identical

  10. Probing anharmonic properties of nuclear surface vibration by heavy-ion fusion reactions

    E-Print Network [OSTI]

    N. Takigawa; K. Hagino; S. Kuyucak

    1997-06-28

    Describing fusion reactions between ^{16}O and ^{154}Dy and, between ^{16}O and ^{144}Sm by the $sd-$ and $sdf-$ interacting boson model, we show that heavy-ion fusion reactions are strongly affected by anharmonic properties of nuclear surface vibrations and nuclear shape, and thus provide a powerful method to study details of nuclear structure and dynamics.

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

    E-Print Network [OSTI]

    I. Casinos

    2008-05-22

    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.

  12. MFE Concept Integration and Performance Measures Magnetic Fusion Concept Working Group

    E-Print Network [OSTI]

    MFE Concept Integration and Performance Measures Magnetic Fusion Concept Working Group Contributors. Simonen, T. Thorson INTRODUCTION This subgroup of the Magnetic Fusion Concepts Working Group discussed the plans for developing the major magnetic confinement concepts: standard pulsed tokamak, advanced tokamak

  13. Excitation of nuclear anharmonic vibrations in heavy-ion fusion reactions

    E-Print Network [OSTI]

    K. Hagino; S. Kuyucak; N. Takigawa

    1997-11-05

    We discuss the effects of multi-phonon excitations on heavy-ion fusion reactions at energies near and below the Coulomb barrier, focusing especially on the role of anharmonicities. We carry out a systematic study of those effects on the excitation function of the fusion cross section and on the fusion barrier distribution, by using the vibrational limit of the interacting boson model. We also analyze the recently measured high-precision data of the $^{16}$O + $^{148}$Sm fusion reaction with this model and discuss the anharmonic properties of the quadrupole as well as the octupole vibrations in $^{148}$Sm. Negative and positive static quadrupole moments are deduced for the first 2$^+$ and 3$^-$ states in $^{148}$Sm, respectively. It is shown that the fusion barrier distribution strongly depends on the sign of the quadrupole moments, suggesting that subbarrier fusion reactions offer an alternative method to extract the static quadrupole moments of phonon states in spherical nuclei.

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

    E-Print Network [OSTI]

    Ning Wang; Xizhen Wu; Zhuxia Li; Min Liu; Werner Scheid

    2006-09-18

    The Skyrme energy-density functional approach has been extended to study the massive heavy-ion fusion reactions. Based on the potential barrier obtained and the parameterized 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_1Z_2fusion reactions, for example, the $^{238}$U-induced reactions and $^{48}$Ca+$^{208}$Pb the capture excitation functions have been reproduced remarkable well. The influence of structure effects in the reaction partners on the capture cross sections are studied with our parameterized barrier distribution. Through comparing the reactions induced by double-magic nucleus $^{48}$Ca and by $^{32}$S and $^{35}$Cl, the 'threshold-like' behavior in the capture excitation function for $^{48}$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 $^{36}$S, $^{37}$Cl, $^{48}$Ca and $^{50}$Ti bombarding on $^{248}$Cm, $^{247,249}$Bk, $^{250,252,254}$Cf and $^{252,254}$Es, and as well as the reactions lead 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.

  15. The nuclear fusion reaction rate based on relativistic equilibrium velocity distribution

    E-Print Network [OSTI]

    Jian-Miin Liu

    2002-10-20

    The Coulomb barrier is in general much higher than thermal energy. Nuclear fusion reactions occur only among few protons and nuclei with higher relative energies than Coulomb barrier. It is the equilibrium velocity distribution of these high-energy protons and nuclei that participates in determining the rate of nuclear fusion reactions. In the circumstance it is inappropriate to use the Maxwellian velocity distribution for calculating the nuclear fusion reaction rate. We use the relativistic equilibrium velocity distribution for this purpose. The rate based on the relativistic equilibrium velocity distribution has a reduction factor with respect to that based on the Maxwellian distribution, which factor depends on the temperature, reduced mass and atomic numbers of the studied nuclear fusion reactions. This signifies much to the solar neutrino problem.

  16. The role of nuclear reactions and -particle transport in the dynamics of inertial confinement fusion capsules

    E-Print Network [OSTI]

    Garnier, Josselin

    The role of nuclear reactions and -particle transport in the dynamics of inertial confinement fusion capsules Josselin Garnier1,a and Catherine Cherfils-Clérouin2 1 Laboratoire de Probabilités et the energy released by nuclear reactions, a nonlocal model for the -particle energy deposition process

  17. Study of nuclei in the vicinity of the "Island of Inversion" through fusion-evaporation reaction

    E-Print Network [OSTI]

    Chakrabarti, R; Chakraborty, A; Ghosh, A; Ray, S; Ghugre, S S; Sinha, A K; Chaturvedi, L; Deo, A Y; Mazumdar, I; Joshi, P K; Palit, R; Naik, Z; Kumar, S; Madhavan, N; Singh, R P; Muralithar, S; Yogi, B K; Garg, U

    2009-01-01

    We report the first observation of high-spin states in nuclei in the vicinity of the "island of inversion", populated via the 18O+18O fusion reaction at an incident beam energy of 34 MeV. The fusion reaction mechanism circumvents the limitations of non-equilibrated reactions used to populate these nuclei. Detailed spin-parity measurements in these difficult to populate nuclei have been possible from the observed coincidence anisotropy and the linear polarization measurements. The spectroscopy of 33,34P and 33S is presented in detail along with the results of calculations within the shell model framework.

  18. Study of nuclei in the vicinity of the "Island of Inversion" through fusion-evaporation reaction

    E-Print Network [OSTI]

    R. Chakrabarti; S. Mukhopadhyay Krishichayan; A. Chakraborty; A. Ghosh; S. Ray; S. S. Ghugre; A. K. Sinha; L. Chaturvedi; A. Y. Deo; I. Mazumdar; P. K. Joshi; R. Palit; Z. Naik; S. Kumar; N. Madhavan; R. P. Singh; S. Muralithar; B. K. Yogi; U. Garg

    2009-04-30

    We report the first observation of high-spin states in nuclei in the vicinity of the "island of inversion", populated via the 18O+18O fusion reaction at an incident beam energy of 34 MeV. The fusion reaction mechanism circumvents the limitations of non-equilibrated reactions used to populate these nuclei. Detailed spin-parity measurements in these difficult to populate nuclei have been possible from the observed coincidence anisotropy and the linear polarization measurements. The spectroscopy of 33,34P and 33S is presented in detail along with the results of calculations within the shell model framework.

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

    E-Print Network [OSTI]

    Seyyedi, S A

    2015-01-01

    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.

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

    E-Print Network [OSTI]

    S. A. Seyyedi; H. Golnarkar

    2015-01-19

    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.

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

    E-Print Network [OSTI]

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

    2007-02-16

    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.

  2. Synthesis of transactinide nuclei in cold fusion reactions using radioactive beams

    SciTech Connect (OSTI)

    Smolanczuk, Robert

    2010-06-15

    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.

  3. Synthesis of transactinide nuclei in cold fusion reactions using radioative beams

    E-Print Network [OSTI]

    Smolanczuk, Robert

    2009-01-01

    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.

  4. Synthesis of transactinide nuclei in cold fusion reactions using radioative beams

    E-Print Network [OSTI]

    Robert Smolanczuk

    2009-12-04

    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.

  5. The Dynamical Dipole Mode in Fusion Reactions with Exotic Nuclear Beams

    E-Print Network [OSTI]

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

    2009-02-09

    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.

  6. Fusion and quasi-fission dynamics in nearly-symmetric reactions

    E-Print Network [OSTI]

    Ning Wang; Kai Zhao; Zhuxia Li

    2015-11-04

    Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasi-fission process in $^{154}$Sm+$^{160}$Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than $10^{-5}$ for this reaction, and the nuclear contact-time is generally smaller than $1500$ fm/c. From the central collisions of Sm+Gd, the neutron-rich fragments such as $^{164,165}$Gd, $^{192}$W can be produced in the ImQMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.

  7. Fusion and quasi-fission dynamics in nearly-symmetric reactions

    E-Print Network [OSTI]

    Wang, Ning; Li, Zhuxia

    2015-01-01

    Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasi-fission process in $^{154}$Sm+$^{160}$Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than $10^{-5}$ for this reaction, and the nuclear contact-time is generally smaller than $1500$ fm/c. From the central collisions of Sm+Gd, the neutron-rich fragments such as $^{164,165}$Gd, $^{192}$W can be produced in the ImQMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.

  8. Investigation of cold fusion phenomena in deuterated metals. Final report, Volume 1. Overview, executive summary, chemistry, physics, gas reactions, metallurgy. Technical information series

    SciTech Connect (OSTI)

    Anderson, L.; Barrowes, S.C.; Bergeson, H.E.; Bourgeois, F.; Cedzynska, K.

    1991-06-01

    The March 1989 announcement by Pons and Fleischmann stimulated worldwide interest in the cold fusion phenomenon. In Utah the legislature appropriated $5 million to support cold fusion research and development. As cold fusion inquiries continue worldwide, this interim report has been written to document the scientific and legal work that has been funded by the Utah legislature. Partial contents include these titles of papers: Cold Fusion Studies in a High-Pressure Sealed Cell; Tritium and Neutron Generation in Palladium Cathodes with High Deuterium Loading; Deuterium-Gas Phase Reactions on Palladium; Excess Heat Estimation with the Kalman Filter; Ultrasonic Energy Effects on Palladium Electrodes in Cold Fusion Cells; Nuclear Measurements on Deuterium-Loaded Palladium and Titanium.

  9. ENERGY ISSUES WORKING GROUP ON LONG-TERM VISIONS FOR FUSION POWER

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    ENERGY ISSUES WORKING GROUP ON LONG-TERM VISIONS FOR FUSION POWER Don Steiner, Jeffrey Freidberg Farrokh Najmabadi William Nevins , and John Perkins The Energy Issues Working Group on Long-Term Visions energy production in the next century? 2. What is fusion's potential for penetrating the energy market

  10. MFE Concept Integration and Performance Measures Magnetic Fusion Concept Working Group

    E-Print Network [OSTI]

    MFE Concept Integration and Performance Measures Magnetic Fusion Concept Working Group Contributors. Simonen, T. Thorson INTRODUCTION This subgroup of the Magnetic Fusion Concepts Working Group discussed, spherical torus, compact stellarator, reversed-field pinch, and spheromak The goal was to identify, for each

  11. Deep sub-barrier fusion reactions of the light nuclei $^{12}$C and $^{16}$O

    E-Print Network [OSTI]

    S. Misicu; F. Carstoiu

    2009-10-05

    Fusion reactions relevant for the carbon and oxygen burning cycles in highly evolved stars are investigated in a standard approach to fusion. We employ the double folding method to evaluate the ion-ion interactions with Gogny-D1 and M3Y-Paris $n-n$ effective forces. The cross-section evaluation do not indicate a possible hindrance even at the lowest energies under the barrier. Reaction rates at temperatures relevant for the stellar processes are estimated and compared to the traditional and modern extrapolation formulas.

  12. Department-wide Quick Reaction Work Order System

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    1981-03-12

    To describe the new Department Wide Quick Reaction Work Order System, to establish the criteria and procedures for its use, and to identify responsibilities for managing and operating the system.

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

    E-Print Network [OSTI]

    M. S. Hussein

    2008-01-13

    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.

  14. Charged particle decay of hot and rotating $^{88}$Mo nuclei in fusion-evaporation reactions

    E-Print Network [OSTI]

    S. Valdré; S. Piantelli; G. Casini; S. Barlini; S. Carboni; M. Ciema?a; M. Kmiecik; A. Maj; K. Mazurek; M. Cinausero; F. Gramegna; V. L. Kravchuk; L. Morelli; T. Marchi; G. Baiocco; L. Bardelli; P. Bednarczyk; G. Benzoni; M. Bini; N. Blasi; A. Bracco; S. Brambilla; M. Bruno; F. Camera; A. Chbihi; A. Corsi; F. C. L. Crespi; M. D'Agostino; M. Degerlier; D. Fabris; B. Fornal; A. Giaz; M. Krzysiek; S. Leoni; M. Matejska-Minda; I. Mazumdar; W. M?czy?ski; B. Million; D. Montanari; S. Myalski; R. Nicolini; A. Olmi; G. Pasquali; G. Prete; O. J. Roberts; J. Stycze?; B. Szpak; B. Wasilewska; O. Wieland; J. P. Wieleczko; M. Zi?bli?ski

    2015-09-10

    A study of fusion-evaporation and (partly) fusion-fission channels for the $^{88}$Mo compound nucleus, produced at different excitation energies in the reaction $^{48}$Ti + $^{40}$Ca at 300, 450 and 600 MeV beam energies, is presented. Fusion-evaporation and fusion-fission cross sections have been extracted and compared with the existing systematics. Experimental data concerning light charged particles have been compared with the prediction of the statistical model in its implementation in the Gemini++ code, well suited even for high spin systems, in order to tune the main model parameters in a mass region not abundantly covered by exclusive experimental data. Multiplicities for light charged particles emitted in fusion evaporation events are also presented. Some discrepancies with respect to the prediction of the statistical model have been found for forward emitted $\\alpha$-particles; they may be due both to pre-equilibrium emission and to reaction channels (such as Deep Inelastic Collisions, QuasiFission/QuasiFusion) different from the compound nucleus formation.

  15. Effects of Breakup of Weakly Bound Projectile and Neutron Transfer on Fusion Reactions

    SciTech Connect (OSTI)

    Lin, C. J.; Zhang, H. Q.; Yang, F.; Ruan, M.; Liu, Z. H.; Wu, X. K.; Zhou, P.; Zhang, C. L.; Zhang, G. L.; An, G. P.; Jia, H. M.; Xu, X. X. [China Institute of Atomic Energy, P.O. Box 275 (10), Beijing 102413 (China)

    2006-11-02

    The excitation functions of elastic and quasielastic scattering at backward angles are measured for the systems 16O + 152Sm , 6,7Li + 208Pb. The barrier distributions are extracted from these measured excitation functions and compared with the corresponding fusion barrier distributions. Except some details, the barrier distributions derived from the data of fusion and elastic/quasielastic scattering are almost the same for the tightly bound reaction systems. For the reaction systems with weakly bound projectile, the barrier distributions extracted from quasielastic scattering are obviously different the fusion barrier distributions. However, the barrier distributions extracted from the excitation functions of the quasielastic scattering plus breakup are almost the same as the one extracted from the complete fusion data. This result means that barrier distribution not only bears the information of nuclear structures but also contains the knowledge of reaction mechanisms. In addition, the measured barrier distribution of 32S + 96Zr is flat and extends to lower energy due to the coupling of neutron transfer with positive Q-values, which will result in a significant enhancement effusion cross sections at the subbarrier energies. However, our results show that the complete fusion of the weakly bound projectile with heavy target is suppressed at the above barrier energies as compared with the model predictions.

  16. 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

  17. On the true nature of transfer reactions leading to the complete fusion of projectile and target

    E-Print Network [OSTI]

    G. Mouze; C. Ythier

    2012-11-15

    The transfer of nucleons in hot-fusion reactions occurs within 0.17 yoctosecond, in a new state of nuclear matter. We suggest that the same state should show itself in an early stage of the phenomena occurring in nucleus-nucleus collisions realized at relativistic energies.

  18. Relativistic equilibrium velocity distribution, nuclear fusion reaction rate and the solar neutrino problem

    E-Print Network [OSTI]

    Jian-Miin Liu

    2003-07-07

    In solar interior, it is the equilibrium velocity distribution of few high-energy protons and nuclei that participates in determining nuclear fusion reaction rates. So, it is inappropriate to use the Maxwellian velocity distribution to calculate the rates of solar nuclear fusion reactions. We have to use the relativistic equilibrium velocity distribution for the purpose. The nuclear fusion reaction rate based on the relativistic equilibrium velocity distribution has a reduction factor with respect to that based on the Maxwellian distribution. The reduction factor depends on the temperature, reduced mass and atomic numbers of the studied nuclear fusion reactions, in other words, it varies with the sort of neutrinos. Substituting the relativistic equilibrium velocity distribution for the Maxwellian distribution is not important for the calculation of solar sound speeds. The relativistic equilibrium velocity distribution, if adopted in standard solar models, will lower solar neutrino fluxes and change solar neutrino energy spectra but maintain solar sound speeds. This velocity distribution is possibly a solution to the solar neutrino problem.

  19. Inertial confinement fusion reaction chamber and power conversion system study

    SciTech Connect (OSTI)

    Maya, I.; Schultz, K.R.; Battaglia, J.M.; Buksa, J.J.; Creedson, R.L.; Erlandson, O.D.; Levine, H.E.; Roelant, D.F.; Sanchez, H.W.; Schrader, S.A.

    1984-09-01

    GA Technologies has developed a conceptual ICF reactor system based on the Cascade rotating-bed reaction chamber concept. Unique features of the system design include the use of low activation SiC in a reaction chamber constructed of box-shaped tiles held together in compression by prestressing tendons to the vacuum chamber. Circulating Li/sub 2/O granules serve as the tritium breeding and energy transport material, cascading down the sides of the reaction chamber to the power conversion system. The total tritium inventory of the system is 6 kg; tritium recovery is accomplished directly from the granules via the vacuum system. A system for centrifugal throw transport of the hot Li/sub 2/O granules from the reaction chamber to the power conversion system has been developed. A number of issues were evaluated during the course of this study. These include the response of first-layer granules to the intense microexplosion surface heat flux, cost effective fabrication of Li/sub 2/O granules, tritium inventory and recovery issues, the thermodynamics of solids-flow options, vacuum versus helium-medium heat transfer, and the tradeoffs of capital cost versus efficiency for alternate heat exchange and power conversion system option. The resultant design options appear to be economically competitive, safe, and environmentally attractive.

  20. The role of electron-screening deformations in solar nuclear fusion reactions and the solar neutrino puzzle

    E-Print Network [OSTI]

    Theodore E. Liolios

    2000-08-13

    Thermonuclear fusion reaction rates in the solar plasma are enhanced by the presence of the electron cloud that screens fusing nuclei. The present work studies the influence of electron screening deformations on solar reaction rates in the framework of the Debye-Huckel model. These electron-ion cloud deformations, assumed here to be static and axially symmetric, are shown to be able to considerably influence the solar neutrino fluxes of the pp and the CNO chains, with reasonable changes in the macroscopic parameters of the standard solar model (SSM) . Various known deformation sources are discussed but none of them is found strong enough to have a significant impact on the SSM neutrino fluxes.

  1. Validity of the linear coupling approximation in heavy-ion fusion reactions at sub barrier energies

    E-Print Network [OSTI]

    K. Hagino; N. Takigawa; M. Dasgupta; D. J. Hinde; J. R. Leigh

    1996-07-26

    The role of higher order coupling of surface vibrations to the relative motion in heavy-ion fusion reactions at near-barrier energies is investigated. The coupled channels equations are solved to all orders, and also in the linear and the quadratic coupling approximations. Taking $^{64}$Ni + $^{92,96}$Zr reactions as examples, it is shown that all order couplings lead to considerably improved agreement with the experimentally measured fusion cross sections and average angular momenta of the compound nucleus for such heavy nearly symmetric systems. The importance of higher order coupling is also examined for asymmetric systems like $^{16}$O + $^{112}$Cd, $^{144}$Sm, for which previous calculations of the fusion cross section seemed to indicate that the linear coupling approximation was adequate. It is shown that the shape of the barrier distributions and the energy dependence of the average angular momentum can change significantly when the higher order couplings are included, even for systems where measured fusion cross sections may seem to be well reproduced by the linear coupling approximation.

  2. Systematic investigations of deep sub-barrier fusion reactions using an adiabatic approach

    E-Print Network [OSTI]

    Ichikawa, Takatoshi

    2015-01-01

    To describe fusion hindrance observed in fusion reactions at extremely low incident energies, I propose a novel extension of the standard CC model by introducing a damping factor that describes a smooth transition from sudden to adiabatic processes. I demonstrate the performance of this model by systematically investigating various deep sub-barrier fusion reactions. I extend the standard CC model by introducing a damping factor into the coupling matrix elements in the standard CC model. I adopt the Yukawa-plus-exponential (YPE) model as a basic heavy ion-ion potential, which is advantageous for a unified description of the one- and two-body potentials. For the purpose of these systematic investigations, I approximate the one-body potential with a third-order polynomial function based on the YPE model. Calculated fusion cross sections for the medium-heavy mass systems of $^{64}$Ni + $^{64}$Ni, $^{58}$Ni + $^{58}$Ni, and $^{58}$Ni + $^{54}$Fe, the medium-light mass systems of $^{40}$Ca + $^{40}$Ca, $^{48}$Ca + ...

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

    E-Print Network [OSTI]

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

    2008-05-07

    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.

  4. Recent EFDA work on Pulsed DEMO, August 2012, TOFE T N Todd Culham Centre for Fusion Energy, Oxfordshire

    E-Print Network [OSTI]

    Energy, Oxfordshire The Future of Nuclear Power: Fusion Recent EFDA work on pulsed DEMO The UK fusion) · Start-up power requirements, energy storage strategy · Energy storage systems available

  5. Astrophysical S-factors for fusion reactions involving C, O, Ne and Mg isotopes

    E-Print Network [OSTI]

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

    2010-02-03

    Using the Sao Paulo potential and the barrier penetration formalism we have calculated the astrophysical factor S(E) for 946 fusion reactions involving stable and neutron-rich isotopes of C, O, Ne, and Mg for center-of-mass energies E varying from 2 MeV to 18-30 MeV (covering the range below and above the Coulomb barrier). We have parameterized the energy dependence S(E) by an accurate universal 9-parameter analytic expression and present tables of fit parameters for all the reactions. We also discuss the reduced 3-parameter version of our fit which is highly accurate at energies below the Coulomb barrier, and outline the procedure for calculating the reaction rates. The results can be easily converted to thermonuclear or pycnonuclear reaction rates to simulate various nuclear burning phenomena, in particular, stellar burning at high temperatures and nucleosynthesis in high density environments.

  6. $^{64}$Ni+$^{64}$Ni fusion reaction calculated with the density-constrained time-dependent Hartree-Fock formalism

    E-Print Network [OSTI]

    A. S. Umar; V. E. Oberacker

    2007-09-25

    We study fusion reactions of the $^{64}$Ni+$^{64}$Ni system using the density-constrained time-dependent Hartree-Fock (TDHF) formalism. In this formalism the fusion barriers are directly obtained from TDHF dynamics. In addition, we incorporate the entrance channel alignments of the slightly deformed (oblate) $^{64}$Ni nuclei due to dynamical Coulomb excitation. We show that alignment leads to a fusion barrier distribution and alters the naive picture for defining which energies are actually sub-barrier. We also show that core polarization effects could play a significant role in fusion cross section calculations.

  7. Fusion reactions with the one-neutron halo nucleus 15C

    E-Print Network [OSTI]

    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

    2011-04-06

    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.

  8. Signature of smooth transition from diabatic to adiabatic states in heavy-ion fusion reactions at deep subbarrier energies

    E-Print Network [OSTI]

    Takatoshi Ichikawa; Kouichi Hagino; Akira Iwamoto

    2009-09-12

    We propose a novel extension of the standard coupled-channels framework for heavy-ion reactions in order to analyze fusion reactions at deep subbarrier incident energies. This extension simulates a smooth transition between the diabatic two-body and the adiabatic one-body states. To this end, we damp gradually the off-diagonal part of the coupling potential, for which the position of the onset of the damping varies for each eigen channel. We show that this model accounts well for the steep falloff of the fusion cross sections for the $^{16}$O+$^{208}$Pb, $^{64}$Ni+$^{64}$Ni, and $^{58}$Ni+$^{58}$Ni reactions.

  9. Present status of coupled-channels calculations for heavy-ion subbarrier fusion reactions

    E-Print Network [OSTI]

    Hagino, K

    2015-01-01

    The coupled-channels method has been a standard tool in analyzing heavy-ion fusion reactions at energies around the Coulomb barrier. We investigate three simplifications usually adopted in the coupled-channels calculations. These are i) the exclusion of non-collective excitations, ii) the assumption of coordinate independent coupling strengths, and iii) the harmonic oscillator approximation for multi-phonon excitations. In connection to the last point, we propose a novel microscopic method based on the beyond-mean-field approach in order to take into account the anharmonic effects of collective vibrations.

  10. A Universal Damping Mechanism of Quantum Vibrations in Deep Sub-Barrier Fusion Reactions

    E-Print Network [OSTI]

    Takatoshi Ichikawa; Kenichi Matsuyanagi

    2015-06-26

    We demonstrate the damping of quantum octupole vibrations near the touching point when two colliding nuclei approach each other in the mass-asymmetric $^{208}$Pb + $^{16}$O system, for which the strong fusion hindrance was clearly observed. We, for the first time, apply the random-phase approximation method to the heavy-mass asymmetric di-nuclear system to calculate the transition strength $B$(E3) as a function of the center-of-mass distance. The obtained $B$(E3) strengths are substantially damped near the touching point, because the single-particle wave functions of the two nuclei strongly mix with each other and a neck is formed. The energy-weighted sums of $B$(E3) are also strongly correlated with the damping factor which is phenomenologically introduced in the standard coupled-channel calculations to reproduce the fusion hindrance. This strongly indicates that the damping of the quantum vibrations universally occurs in the deep sub-barrier fusion reactions.

  11. A Universal Damping Mechanism of Quantum Vibrations in Deep Sub-Barrier Fusion Reactions

    E-Print Network [OSTI]

    Ichikawa, Takatoshi

    2015-01-01

    We demonstrate the damping of quantum octupole vibrations near the touching point when two colliding nuclei approach each other in the mass-asymmetric $^{208}$Pb + $^{16}$O system, for which the strong fusion hindrance was clearly observed. We, for the first time, apply the random-phase approximation method to the heavy-mass asymmetric di-nuclear system to calculate the transition strength $B$(E3) as a function of the center-of-mass distance. The obtained $B$(E3) strengths are substantially damped near the touching point, because the single-particle wave functions of the two nuclei strongly mix with each other and a neck is formed. The energy-weighted sums of $B$(E3) are also strongly correlated with the damping factor which is phenomenologically introduced in the standard coupled-channel calculations to reproduce the fusion hindrance. This strongly indicates that the damping of the quantum vibrations universally occurs in the deep sub-barrier fusion reactions.

  12. Study of the 12C+12C fusion reactions near the Gamow energy

    E-Print Network [OSTI]

    T. Spillane; F. Raiola; S. Zeng; H. -W. Becker; C. Bordeanu; L. Gialanella; C. Rolfs; M. Romano; D. Sch"urmann; J. Schweitzer; F. Strieder

    2007-02-09

    The fusion reactions 12C(12C,a)20Ne and 12C(12C,p)23Na have been studied from E = 2.10 to 4.75 MeV by gamma-ray spectroscopy using a C target with ultra-low hydrogen contamination. The deduced astrophysical S(E)* factor exhibits new resonances at E energy tail of the Gamow peak. The resonance increases the present non-resonant reaction rate of the alpha channel by a factor of 5 near T = 8x10^8 K. Due to the resonance structure, extrapolation to the Gamow energy E_G = 1.5 MeV is quite uncertain. An experimental approach based on an underground accelerator placed in a salt mine in combination with a high efficiency detection setup could provide data over the full E_G energy range.

  13. Evidence for a New Path to the Self-Sustainment of the Thermonuclear Fusion Reactions in Magnetically Confined Burning Plasma Experiments

    E-Print Network [OSTI]

    Evidence for a New Path to the Self-Sustainment of the Thermonuclear Fusion Reactions in Magnetically Confined Burning Plasma Experiments

  14. Fusion cross sections for the {sup 9}Be+{sup 124}Sn reaction at energies near the Coulomb barrier

    SciTech Connect (OSTI)

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

    2010-11-15

    The complete and incomplete fusion cross sections for {sup 9}Be+{sup 124}Sn reaction have been deduced using the online {gamma}-ray measurement technique. Complete fusion at energies above the Coulomb barrier was found to be suppressed by {approx}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 {sup 124}Sn target shows that, for {sup 9}Be nuclei, the enhancement at below-barrier energies is substantial compared to that of tightly bound nuclei.

  15. A model for enhanced fusion reaction in a solid matrix of metal deuterides

    E-Print Network [OSTI]

    K. P. Sinha; A. Meulenberg

    2009-01-16

    Our study shows that the cross-section for fusion improves considerably if d-d pairs are located in linear (one-dimensional) chainlets or line defects. Such non-equilibrium defects can exist only in a solid matrix. Further, solids harbor lattice vibrational modes (quanta, phonons) whose longitudinal-optical modes interact strongly with electrons and ions. One such interaction, resulting in potential inversion, causes localization of electron pairs on deuterons. Thus, we have attraction of D+ D- pairs and strong screening of the nuclear repulsion due to these local electron pairs (local charged bosons: acronym, lochons). This attraction and strong coupling permits low-energy deuterons to approach close enough to alter the standard equations used to define nuclear-interaction cross-sections. These altered equations not only predict that low-energy-nuclear reactions (LENR) of D+ D- (and H+ H-) pairs are possible, they predict that they are probable.

  16. A model for enhanced fusion reaction in a solid matrix of metal deuterides

    E-Print Network [OSTI]

    Sinha, K P

    2009-01-01

    Our study shows that the cross-section for fusion improves considerably if d-d pairs are located in linear (one-dimensional) chainlets or line defects. Such non-equilibrium defects can exist only in a solid matrix. Further, solids harbor lattice vibrational modes (quanta, phonons) whose longitudinal-optical modes interact strongly with electrons and ions. One such interaction, resulting in potential inversion, causes localization of electron pairs on deuterons. Thus, we have attraction of D+ D- pairs and strong screening of the nuclear repulsion due to these local electron pairs (local charged bosons: acronym, lochons). This attraction and strong coupling permits low-energy deuterons to approach close enough to alter the standard equations used to define nuclear-interaction cross-sections. These altered equations not only predict that low-energy-nuclear reactions (LENR) of D+ D- (and H+ H-) pairs are possible, they predict that they are probable.

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

    SciTech Connect (OSTI)

    Itkis, I. M.; Itkis, M. G.; Knyazheva, G. N.; Kozulin, E. M.

    2012-10-20

    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.

  18. Semi-microscopic modeling of heavy-ion fusion reactions with multi-reference covariant density functional theory

    E-Print Network [OSTI]

    K. Hagino; J. M. Yao

    2015-04-15

    We describe low-lying collective excitations of atomic nuclei with the multi-reference covariant density functional theory, and combine them with coupled-channels calculations for heavy-ion fusion reactions at energies around the Coulomb barrier. To this end, we use the calculated transition strengths among several collective states as inputs to the coupled-channels calculations. This approach provides a natural way to describe anharmonic multi-phonon excitations as well as a deviation of rotational excitations from a simple rigid rotor. We apply this method to subbarrier fusion reactions of $^{58}$Ni+$^{58}$Ni, $^{58}$Ni+$^{60}$Ni and $^{40}$Ca+$^{58}$Ni systems. We find that the effect of anharmonicity tends to smear the fusion barrier distributions, better reproducing the experimental data compared to the calculations in the harmonic oscillator limit.

  19. (Experimental development, testing and research work in support of the inertial confinement fusion program)

    SciTech Connect (OSTI)

    Johnson, R.; Luckhardt, R.; Terry, N.; Drake, D.; Gaines, J. (eds.)

    1990-04-27

    This KMS Fusion Semi-Annual Technical Report covers the period October 1989 through March 1990. It contains a review of work performed by KMS Fusion, Inc. (KMSF), in support of the national program to achieve inertially confined fusion (ICF). A major section of the report is devoted to target technology, a field which is expected to play an increasingly important role in the overall KMSF fusion effort. Among the highlights of our efforts in this area covered in this report are: improvements and new developments in target fabrication techniques, including a discussion of techniques for introducing gaussian bumps and bands on target surfaces. Development of a single automated system for the interferometric characterization of transparent shells. Residual gas analysis of the blowing gases contained in glass shells made from xerogels. These usually include CO{sub 2}, O{sub 2} and N{sub 2}, and are objectionable because they dilute the fuel. Efforts to observe the ice layers formed in the {beta}-layering process in cryogenic targets, and to simulate the formation of these layers. In addition to our work on target technology, we conducted experiments with the Chroma laser and supported the ICF effort at other labs with theoretical and computational support as well as diagnostic development. Included in the work covered in this report are: experiments on Chroma to study interpenetration of and ionization balance in laser generated plasmas. Diagnostic development, including an optical probe for the Aurora laser at Los Alamos National Laboratory, and a high energy x-ray continuum spectrograph for Aurora. Investigation of the radiation cooling instability as a possible mechanism for the generation of relatively cold, dense jets observed in ICF experiments.

  20. A Classical Approach in Simple Nuclear Fusion Reaction 1H2 + 1H3 using Two-Dimension Granular Molecular Dynamics Model

    E-Print Network [OSTI]

    Sparisoma Viridi; Rizal Kurniadi; Abdul Waris; Yudha Satya Perkasa

    2011-09-30

    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 1H2 and 1H3 is observed. Several products of the fusion reaction have been obtained, even the unreported ones, including temporary 2He4 nucleus.

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

    E-Print Network [OSTI]

    Siddik, Tarik

    2013-01-01

    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 .

  2. PHYSICAL REVIEW C 76, 045802 (2007) S~ao Paulo potential as a tool for calculating S factors of fusion reactions in dense stellar matter

    E-Print Network [OSTI]

    2007-01-01

    cores and neutron star crusts. Of particular interest is the possibility of fusion induced burning of fusion reactions in dense stellar matter L. R. Gasques,1,* A. V. Afanasjev,1,2 M. Beard,1 J. Lubian,3 T matter in cores of massive white dwarfs and crusts of accreting neutron stars) are outlined. DOI: 10

  3. Bold Step by the World to Fusion Energy: ITER

    E-Print Network [OSTI]

    Bold Step by the World to Fusion Energy: ITER Gerald A. Navratil 2006 Con Edison Lecture Fu electrically charged particles at very high energy: Threshold temperature for most reactive fusion reaction' FUSION PLASMA REGIME. · US WORKING WITH INTERNATIONAL COMMUNITY IS NOW READY TO BUILD THE WORLDS FIRST

  4. Statistics at work in heavy-ion reactions

    SciTech Connect (OSTI)

    Moretto, L.G.

    1982-07-01

    In the first part special aspects of the compound nucleus decay are considered. The evaporation of particles intermediate between nucleons and fission fragments is explored both theoretically and experimentally. The limitations of the fission decay width expression obtained with the transition state method are discussed, and a more general approach is proposed. In the second part the process of angular momentum transfer in deep inelastic reactions is considered. The limit of statistical equilibrium is studied and specifically applied to the estimation of the degree of alignment of the fragment spins. The magnitude and alignment of the transferred angular momentum is experimentally determined from sequentially emitted alpha, gamma, and fission fragments.

  5. Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration

    SciTech Connect (OSTI)

    Thirolf, P. G.; Gross, M.; Allinger, K.; Bin, J.; Henig, A.; Kiefer, D.; Habs, D.; Ma, W.; Schreiber, J.

    2011-10-28

    We propose to produce neutron-rich nuclei in the range of the astrophysical r-process around the waiting point N = 126 by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a CH{sub 2} layer), where the light fission fragments of the beam fuse with the light fission fragments of the target. Via the 'hole-boring' mode of laser Radiation Pressure Acceleration using a high-intensity, short pulse laser, very efficiently bunches of {sup 232}Th with solid-state density can be generated from a Th target and a deuterated CD{sub 2} foil, both forming the production target assembly. Laser-accelerated Th ions with about 7 MeV/u will pass through a thin CH{sub 2} layer placed in front of a thicker second Th foil (both forming the reaction target) closely behind the production target and disintegrate into light and heavy fission fragments. In addition, light ions (d,C) from the CD{sub 2} layer of the production target will be accelerated as well, inducing the fission process of {sup 232}Th also in the second Th layer. The laser-accelerated ion bunches with solid-state density, which are about 10{sup 14} times more dense than classically accelerated ion bunches, allow for a high probability that generated fission products can fuse again. The high ion beam density may lead to a strong collective modification of the stopping power, leading to significant range and thus yield enhancement. Using a high-intensity laser as envisaged for the ELI-Nuclear Physics project in Bucharest (ELI-NP), order-of-magnitude estimates promise a fusion yield of about 10{sup 3} ions per laser pulse in the mass range of A = 180-190, thus enabling to approach the r-process waiting point at N = 126.

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

    E-Print Network [OSTI]

    Nelson, Sarah L

    2008-01-01

    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

  7. Indirect-direct hybrid-drive work-dominated hotspot ignition for inertial confinement fusion

    E-Print Network [OSTI]

    He, X T; Li, J W; Liu, J; Lan, K; Wu, J F; Wang, L F; Ye, W H

    2015-01-01

    An indirect-direct hybrid-drive work-dominated hotspot ignition scheme for inertial confinement fusion is proposed: a layered fuel capsule inside a spherical hohlraum with an octahedral symmetry is compressed first by indirect-drive soft-x rays (radiation) and then by direct-drive lasers in last pulse duration. In this scheme, an enhanced shock and a follow-up compression wave for ignition with pressure far greater than the radiation ablation pressure are driven by the direct-drive lasers, and provide large pdV work to the hotspot to perform the work-dominated ignition. The numerical simulations show that the enhanced shock stops the reflections of indirect-drive shock at the main fuel-hotspot interface, and therefore significantly suppresses the hydrodynamic instabilities and asymmetry. Based on the indirect-drive implosion dynamics the hotspot is further compressed and heated by the enhanced shock and follow-up compression wave, resulting in the work-dominated hotspot ignition and burn with a maximal implos...

  8. Experimental study of nuclei in the vicinity of the ''island of inversion'' through the fusion-evaporation reaction

    SciTech Connect (OSTI)

    Chakrabarti, R.; Mukhopadhyay, S.; Krishichayan; Chakraborty, A.; Ghosh, A.; Ray, S.; Ghugre, S. S.; Sinha, A. K. [UGC-DAE Consortium for Scientific Research, Kolkata Centre, Kolkata 700098 (India); Chaturvedi, L. [Department of Physics, Pt. Ravishankar University, Raipur 492010 (India); Deo, A. Y.; Mazumdar, I.; Joshi, P. K.; Palit, R.; Naik, Z. [Tata Institute of Fundamental Research, Mumbai 400005 (India); Kumar, S. [Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India); Madhavan, N.; Singh, R. P.; Muralithar, S. [Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India); Yogi, B. K. [Department of Physics, Govt. College, Kota 324009 (India); Garg, U. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

    2009-09-15

    We report the observation of high-spin states in nuclei in the vicinity of the 'island of inversion', populated via the {sup 18}O+{sup 18}O fusion reaction at an incident beam energy of 34 MeV. The fusion reaction mechanism circumvents the limitations of other reactions used so far to populate excited states in these nuclei. The level structures of {sup 33,34}P and {sup 33}S have been investigated and their level schemes were substantially extended. The intensities and branching ratios of the {gamma} transitions were measured. The observed {gamma} coincidence intensity anisotropy and polarization asymmetry were analyzed for a consistent assignment of the spins and parities of the nuclear levels. The 1876-keV transition in {sup 34}P that had an ambiguous multipolarity assignment has been confirmed to be a mixed transition. Truncated (1p-1h) shell model calculations within the 'sdpf' valence space were performed. These calculations reproduce the experimental excitation energies of {sup 34}P but fail to explain the observed mixing ratio for the 1876-keV transition.

  9. Photo-fusion reactions in a new compact device for ELI

    SciTech Connect (OSTI)

    Moustaizis, S. D.; Auvray, P.; Hora, H.; Lalousis, P.; Larour, J.; Mourou, G. [Technical University of Crete, Science Department, 73100 Chania, Crete (Greece); LPP-Laboratoire de Physique des Plasmas, Ecole Polytechnique, Palaiseau (France); Department of Theoret. Physics, Univ. New South Wales, Sydney 2052 (Australia); Institute of Electronic Structure and Laser, FORTH, Heraklion (Greece); LPP-Laboratoire de Physique des Plasmas, Ecole Polytechnique, Palaiseau (France); LOA Laboratoire d'Optique Appliquee, ENSTA, Palaiseau Cedex (France)

    2012-07-09

    In the last few years significant progress on technological, experimental and numerical studies on fusion process in high density and high temperature plasmas produced by a high intensity laser pulse interaction with clusters in a high external applied magnetic field, enable us to propose a compact photo-fusion magnetic device for high neutron production. For the purpose of the project a pulsed magnetic field driver with values up to 110 Tesla has been developed which allows increasing the trapping time of the high density plasma in the device and improving the neutron yield. Numerical simulations show that the proposed device is capable of producing up to 10{sup 9}-10{sup 10} neutrons per laser shot with an external magnetic field of 150 Tesla. The proposed device can be used for experiments and numerical code validation concerning different conventional and (or) exotic fusion fuels.

  10. Fusion reactions in collisions induced by Li isotopes on Sn targets

    SciTech Connect (OSTI)

    Fisichella, M.; Shotter, A. C.; Di Pietro, A.; Figuera, P.; Lattuada, M.; Marchetta, C.; Musumarra, A.; Pellegriti, M. G.; Ruiz, C.; Scuderi, V.; Strano, E.; Torresi, D.; Zadro, M.

    2012-10-20

    Fusion cross sections for the {sup 6}Li+{sup 120}Sn and {sup 7}Li+{sup 119}Sn systems have been measured. We aim to search for possible effects due to the different neutron transfer Q-values, by comparing the fusion cross sections for the two systems below the barrier. This experiment is the first step of a wider systematic aiming to study the above problems in collisions induced by stable and unstable Li isotopes on tin all forming the same compound nucleus.

  11. Some thoughts on a simple mechanism for the [sup 2]H + [sup 2]H [yields] [sup 4]He cold fusion reaction

    SciTech Connect (OSTI)

    Park, A.E.

    1993-11-01

    A speculative mechanism for the creation of [sup 4]He using cold fusion is proposed. The nuclear transformation can be made by the fusion of two excited rotating ground states of deuterium into a highly excited rotating ground state of [sup 4]He. Under compression and relatively stable conditions, the formation of such a bound, stretched-out pnnp state of [sup 4]He would be favored (with respect to Coulomb repulsion) over other nuclear ground states without as much angular momentum. The reaction likely occurs at the surface of palladium. A more descriptive name for this reaction is compressed-rotational-shielded (CRS) fusion. Potential experimental conditions for enhancing the initiation of CRS fusion are discussed. 8 refs., 2 figs.

  12. Reaction dynamics of weakly-bound nuclei at near-barrier energies: impact of incomplete fusion on the angular distribution of direct alpha-production

    E-Print Network [OSTI]

    Alexis Diaz-Torres

    2009-10-22

    The classical trajectory model with stochastic breakup for nuclear collision dynamics of weakly-bound nuclei is further developed. It allows a quantitative study of the importance of incomplete fusion dynamics in the angular distribution of direct alpha-production. Model calculations indicate that the incomplete fusion contribution diminishes with decreasing energy towards the Coulomb barrier, notably separating in angles from the contribution of no-capture breakup events. This should facilitate the experimental disentanglement of these competing reaction processes.

  13. Effects of $?_{6}$ deformation and low-lying vibrational bands on heavy-ion fusion reactions at sub-barrier energies

    E-Print Network [OSTI]

    Tamanna Rumin; Kouichi Hagino; Noboru Takigawa

    1999-08-03

    We study fusion reactions of $^{16}$O with $^{154}$Sm, $^{186}$W and $^{238}$U at sub-barrier energies by a coupled-channels framework. We focus especially on the effects of $\\beta_{6}$ deformation and low-lying vibrational excitations of the target nucleus. It is shown that the inclusion of $\\beta_{6}$ deformation leads to a considerable improvement of the fit to the experimental data for all of these reactions. For the $^{154}$Sm and $^{238}$U targets, the octupole vibration significantly affects the fusion barrier distribution. The effect of $\\beta$ band is negligible in all the three reactions, while the $\\gamma$ band causes a non-negligible effect on the barrier distribution at energies above the main fusion barrier. We compare the optimum values of the deformation parameters obtained by fitting the fusion data with those obtained from inelastic scatterings and the ground state mass calculations. We show that the channel coupling of high multipolarity beyond the quadrupole coupling is dominated by the nuclear coupling and hence higher order Coulomb coupling does not much influence the optimum values of $\\beta_4$ and $\\beta_6$ parameters. We also discuss the effect of two neutron transfer reactions on the fusion of $^{16}$O with $^{238}$U.

  14. Investigation of reports of fusion reactions occurring at the cathode in glow discharges

    SciTech Connect (OSTI)

    Ellison, C.H.; Mahaffey, J.A.

    1996-01-01

    Recent reports of deuteron-deuteron (d-d) neutrons resulting from nuclear reactions in or at the palladium cathode of a deuterium glow discharge were investigated. The equipment, techniques, and experimental procedures are discussed in detail, as well as various possible mechanisms to produce such reactions. The results of this investigation do not confirm the presence of d-d reactions. 15 refs., 9 figs.

  15. Thermal properties of light nuclei from 12 fusion-evaporation reactions2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    this theory the detailed output of a generic nuclear reaction is41 uniquely predicted under the knowledge applications of nuclear44 physics, from nucleosynthesis calculations to reactor science. Its direct measurement in the second paper of the series.33 PACS numbers: 25.70.z, 24.60.Dr, 27.30.+t, 24.10.Pa34 NUCLEAR REACTIONS 12C

  16. PRODUCTION OF {sup 9}Be THROUGH THE {alpha}-FUSION REACTION OF METAL-POOR COSMIC RAYS AND STELLAR FLARES

    SciTech Connect (OSTI)

    Kusakabe, Motohiko; Kawasaki, Masahiro E-mail: kawasaki@icrr.u-tokyo.ac.jp

    2013-04-10

    Spectroscopic observations of metal-poor stars have indicated possible {sup 6}Li abundances that are much larger than the primordial abundance predicted in the standard big bang nucleosynthesis model. Possible mechanisms of {sup 6}Li production in metal-poor stars include pregalactic and cosmological cosmic-ray (CR) nucleosynthesis and nucleosynthesis by flare-accelerated nuclides. We study {sup 9}Be production via two-step {alpha}-fusion reactions of CR or flare-accelerated {sup 3,4}He through {sup 6}He and {sup 6,7}Li, in pregalactic structure, intergalactic medium, and stellar surfaces. We solve transfer equations of CR or flare particles and calculate nuclear yields of {sup 6}He, {sup 6,7}Li, and {sup 9}Be taking account of probabilities of processing {sup 6}He and {sup 6,7}Li into {sup 9}Be via fusions with {alpha} particles. Yield ratios, i.e., {sup 9}Be/{sup 6}Li, are then calculated for the CR and flare nucleosynthesis models. We suggest that the future observations of {sup 9}Be in metal-poor stars may find enhanced abundances originating from metal-poor CR or flare activities.

  17. Investigations of the deuterium-deuterium fusion reaction in cast, annealed, and cold-rolled palladium

    SciTech Connect (OSTI)

    Ilic, R.; Rant, J.; Sutej, T.; Dobersek, M.; Kristof, E.; Skvarc, J.; Kozelj, M. )

    1990-11-01

    This paper reports on a search conducted for neutrons, protons, tritons, {sup 3}He ions, gamma rays, and ion-induced X-rays from deuterium-deuterium (D-D) fusion in cast (36-g), annealed (4-g), and cold-rolled (16-g) palladium specimens and a palladium hydrogen thermal valve (11 g) electrochemically charged with deuterium. The palladium cathodes were charged in an electrolytic cell (0.1 M LiOD (99.8% deuterium), platinum anode) at a current density of 25 mA/cm{sup 2} from 20 to 140 h.

  18. LINE: a code which simulates spectral line shapes for fusion reaction products generated by various speed distributions

    SciTech Connect (OSTI)

    Slaughter, D.

    1985-03-01

    A computer code is described which estimates the energy spectrum or ''line-shape'' for the charged particles and ..gamma..-rays produced by the fusion of low-z ions in a hot plasma. The simulation has several ''built-in'' ion velocity distributions characteristic of heated plasmas and it also accepts arbitrary speed and angular distributions although they must all be symmetric about the z-axis. An energy spectrum of one of the reaction products (ion, neutron, or ..gamma..-ray) is calculated at one angle with respect to the symmetry axis. The results are shown in tabular form, they are plotted graphically, and the moments of the spectrum to order ten are calculated both with respect to the origin and with respect to the mean.

  19. 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]

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

    2005-09-27

    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.

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

    SciTech Connect (OSTI)

    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)

    2014-03-05

    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.

  1. Synthesis of Shell-Stabilized Nuclides in Fusion-Evaporation Reactions Induced by 48Ca, 50Ti, or 54Cr Projectiles 

    E-Print Network [OSTI]

    Mayorov, Dmitriy A

    2015-04-28

    Production cross sections of nuclides in the vicinity of the closed neutron shell at N = 126 were measured in heavy-ion fusion reactions with 154Gd, 159Tb, 162Dy, and 165Hotargets. Even-Z beams of 48Ca, 50Ti, and 54Cr were chosen for this systematic...

  2. An overview on incomplete fusion reaction dynamics at energy range ? 3-8 MeV/A

    SciTech Connect (OSTI)

    Ali, Rahbar; Singh, D.; Ansari, M. Afzal; Kumar, Rakesh; Muralithar, S.; Golda, K. S.; Singh, R. P.; Bhowmik, R. K.; Rashid, M. H.; Guin, R.; Das, S. K.

    2014-08-14

    The information of ICF reaction has been obtained from the measurement of excitation function (EF) of ERs populated in the interaction of {sup 20}Ne and {sup 16}O on {sup 55}Mn, {sup 159}Tb and {sup 156}Gd targets. Sizable enhancement in the measured cross-sections has been observed in ?-emitting channels over theoretical predictions, which has been attributed to ICF of the projectile. In order to confirm the findings of the measurements and analysis of EFs, the forward recoil range distributions of ERs populated in {sup 20}Ne+{sup 159}Tb (E ?165MeV) and {sup 16}O+{sup 156}Gd (E ? 72, 82 and 93MeV) systems, have been measured. It has been observed that peaks appearing at different cumulative thicknesses in the stopping medium are related with different degree of linear momentum transfer from projectile to target nucleus by adopting the break-up fusion model consideration. In order to deduce the angular momentum involved in various CF and / or ICF reaction products, spin distribution and side-feeding intensity profiles of radio-nuclides populated via CF and ICF channels in {sup 16}O+{sup 160}Gd system at energy, E ? 5.6 MeV/A, have been studied. Spin distribution of ICF products are found to be distinctly different than that observed from CF products.

  3. Comment on "Observation of neutronless fusion reactions in picosecond laser plasmas"

    E-Print Network [OSTI]

    S. Kimura; A. Anzalone; A. Bonasera

    2009-02-26

    The paper by Belyaev et al. [Phys. Rev. E {\\bf 72}, 026406 (2005)] reported the first experimental observation of alpha particles produced in the thermonuclear reaction $^{11}$B($p,\\alpha$)$^{8}$Be induced by laser-irradiation on a $^{11}$B polyethylene (CH$_2$) composite target. The laser used in the experiment is characterized by a picosecond pulse duration and a peak of intensity of 2$\\times10^{18}$ W/cm$^2$. 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 10$^5 \\alpha$ per shot.

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

    E-Print Network [OSTI]

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

    2010-04-15

    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.

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

    E-Print Network [OSTI]

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

    2010-01-01

    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.

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

    E-Print Network [OSTI]

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

    2001-11-02

    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.

  7. Results of an attempt to measure increased rates of the reaction D-2 + D-2 yields He-3 + n in a nonelectrochemical cold fusion experiment

    SciTech Connect (OSTI)

    Fralick, G.C.; Decker, A.J.; Blue, J.W.

    1989-12-01

    An experiment was performed to look for evidence of deuterium fusion in palladium. The experiment, which involved introducing deuterium into the palladium filter of a hydrogen purifier, was designed to detect neutrons produced in the reaction D-2 + D-2 yields He-3 + n as well as heat production. The neutron counts for deuterium did not differ significantly from background or from the counts for a hydrogen control. Heat production was detected when deuterium, but not hydrogen, was pumped from the purifier.

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

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With WIPPfinalUnexpectedofWykoW03:Connect UsesUsingMapsUsingPlasma

  9. Historical collection of preprints, reprints, working papers, correspondence, and other documents related to the "cold fusion" experiments conducted by Stanley Pons and Martin Fleischmann.

    SciTech Connect (OSTI)

    2013-04-01

    This historical collection consists of various letters, correspondence, working papers, reprints, preprints, workshop reports, and news clippings related to the "cold fusion" experiments conducted by Stanley Pons and Martin Fleischmann. Binders and contents. 1. Laboratory Reprints/Preprints (Laboratory Documents from 9 national Labs. Some original documents); 2. Summary Report by Dr. Duane L. Barney (Articles, Letters, and Reports through 1994 on Cold Fusion. Original Documents); 3. Conference Workshops (Official Documents, schedules, and notes from 4 conferences); 4. HSS&T Hearings, SRI Incident Jan. 1992 (Summary of Cold Fusion Research and reports following SRI Incident. Original Documents); 5. Media 1989 to Present (circa 1995) (Journals, Magazines, Newspapers, and Press Releases from 1989-1995. Some reprints, some original articles/magazines); 6. Science in Service of National Economy aka Manfred's Book (A comprehensive overview of various research being done at Laboratories across the country that could impact the economy); 7. ERAB Information (Comprehensive Report on Cold Fusion Research w/ recommendations on funding and continued research. Original documents); 8. Misc.: Memorandum, Notes, Reports, Summaries, and Updates Chronologically 1989 (Various documents related to Cold Fusion in order of print from 1989. Original documents); 9. Misc.: Memorandum, Notes, Reports, Summaries, and Updates Chronologically 1990-1992 (Various documents related to Cold Fusion including status reports and research in order of print from 1990-1992. Original documents); 10. Misc.: Memorandum, Notes, Reports, Summaries, and Updates Chronologically 1993-1995 (Various documents related to Cold Fusion including status reports and research in order of print from 1993-1995. Original documents); 11. General: Preprints/Reprints Filed by Institution A-H (Reports of Research and Conclusion from various universities and institutions.); 12. General: Preprints/Reprints Filed by Institution I-R (Reports of Research and Conclusion from various universities and institutions.); 13. General: Preprints/Reprints Filed by Institution S-Z (Reports of Research and Conclusion from various universities and institutions.); 14. General: Correspondence, Incoming, Inquiries A-F (Letters, Correspondence, and Inquiries regarding Cold Fusion and its research. Sorted by Last Name of Author. Original documents); 15. General: Correspondence, Incoming, Inquiries G-L (Letters, Correspondence, and Inquiries regarding Cold Fusion and its research. Sorted by Last Name of Author. Original documents); 16. General: Correspondence, Incoming, Inquiries M-R (Letters, Correspondence, and Inquiries regarding Cold Fusion and its research. Sorted by Last Name of Author. Original documents); 17. General: Correspondence, Incoming, Inquiries S-Z (Letters, Correspondence, and Inquiries regarding Cold Fusion and its research. Sorted by Last Name of Author. Original documents); 18. Miscellaneous papers (Investigation of Cold Fusion Phenomena in Deuterated Metals-NCFI Final Report Volumes I. II, and III; June 1991; 4th Annual Conference on Cold Fusion Proceedings: Volumes 1-4; Development of Advanced Concepts for Nuclear Processes in Deuterated Metals; A Comprehensive Report on the research methods, background information, and principles related to Cold Fusion; Cold Fusion Research: November 1989; ERAB report on Cold Fusion Research; Proceedings: Workshop on Anomalous Effects in Deuterided Metals; Workshop designed to generate audio between skeptics and advocates to examine Cold Fusion research results and remaining questions in research methods; Muon Catalyzed Fusion; Overview of Muon Catalyzed Fusion; Grant Application for Cold Fusion Research; Original application to DOE from Prof. Pons that was withdrawn in favor of a new grant proposal).

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

    E-Print Network [OSTI]

    2007-01-01

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

  11. Fusion energy

    SciTech Connect (OSTI)

    Baylor, Larry

    2014-05-02

    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

  12. Fusion energy

    ScienceCinema (OSTI)

    Baylor, Larry

    2014-05-23

    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

  13. Fusion reaction of halo nuclei: A real-time wave-packet method for three-body tunneling dynamics

    E-Print Network [OSTI]

    T. Nakatsukasa; M. Ito; K. Yabana; M. Ueda

    2006-05-12

    We investigate fusion cross section of a nucleus with a valence neutron, using the time-dependent wave-packet method. For a stable projectile, in which the valence neutron is tightly bound (e_n fusion probability when the matching condition of orbital energies are satisfied. In contrast, for a halo nucleus, in which the binding energy of the neutron is very small (e_n>-1 MeV), the fusion probability is hindered by the presence of the weakly bound neutron.

  14. Field-reversed Configuration Plasma for Magnetized Target Fusion Manuscript received September 8, 2005. Revised January 16, 2006. This work was supported by the Department of Energy--

    E-Print Network [OSTI]

    . INTRODUCTION Approaches to plasma fusion research are usually categorized as either Magnetic confinement Fusion

  15. Exploring the influence of transfer channels on fusion reactions: The case of 40 Ca + 58,64 Ni

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Bourgin, D.; Courtin, S.; Haas, F.; Goasduff, A.; Stefanini, A. M.; Montagnoli, G.; Montanari, D.; Corradi, L.; Huiming, J.; Scarlassara, F.; et al

    2015-01-29

    Fusion cross sections have been measured in the 40Ca + 58Ni and 40Ca + 64Ni systems at beam energies ranging from Elab = 104.75 MeV to 153.5 MeV using the Laboratori Nazionali di Legnaro electrostatic deflector. Distributions of barriers have been extracted from the experimental data. Preliminary coupled channel calculations were performed and hints of effects of neutron transfers on the fusion below the barrier in the 40Ca + 64Ni are discussed.

  16. Scientific Breakeven for Fusion Energy For the past 40 years, the IFE fusion research community has adopted: achieving a fusion gain of 1 as

    E-Print Network [OSTI]

    Scientific Breakeven for Fusion Energy For the past 40 years, the IFE fusion research community has as fusion energy produced divided the external energy incident on the fusion reaction chamber. Typical fusion power plant design concepts require a fusion gain of 30 for MFE and 70 for IFE. Fusion energy

  17. Charged-Particle Thermonuclear Reaction Rates: IV. Comparison to Previous Work

    E-Print Network [OSTI]

    Christian Iliadis; Richard Longland; Art Champagne; Alain Coc

    2010-04-23

    We compare our Monte Carlo reaction rates (see Paper II of this series) to previous results that were obtained by using the classical method of computing thermonuclear reaction rates. For each reaction, the comparison is presented using two types of graphs: the first shows the change in reaction rate uncertainties, while the second displays our new results normalized to the previously recommended reaction rate. We find that the rates have changed significantly for almost all reactions considered here. The changes are caused by (i) our new Monte Carlo method of computing reaction rates (see Paper I of this series), and (ii) newly available nuclear physics information (see Paper III of this series).

  18. NUCLEAR STRUCTURE AND HEAVY-ION FUSION

    E-Print Network [OSTI]

    Stokstad, R.G.

    2010-01-01

    mechanisms leading to fusion, nuclear structure is affectingknoi,. A [he "nuclear structure" in fusion will consist ofCI i CO I0 + Be fusion I0 ' -cm Nuclear reaction S-factors

  19. Investigation of complete and incomplete fusion dynamics of {sup 20}Ne induced reactions at energies above the Coulomb barrier

    SciTech Connect (OSTI)

    Singh, D., E-mail: dsinghiuac@gmail.com [Centre for Applied Physics, Central University of Jharkhand, Ranchi-835 205 (India); Ali, R. [Department of Physics, G.F.(P.G.), College, Shahjahanpur-242 001 (India); Kumar, Harish; Ansari, M. Afzal [Department of Physics, Aligarh Muslim University, Aligarh-202 002 (India); Rashid, M. H.; Guin, R. [Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064 (India)

    2014-08-14

    Experiment has been performed to explore the complete and incomplete fusion dynamics in heavy ion collisions using stacked foil activation technique. The measurement of excitation functions of the evaporation residues produced in the {sup 20}Ne+{sup 165}Ho system at projectile energies ranges ? 4-8 MeV/nucleon have been done. Measured cumulative and direct cross-sections have been compared with the theoretical model code PACE-2, which takes into account only the complete fusion process. The analysis indicates the presence of contributions from incomplete fusion processes in some ?-emission channels following the break-up of the projectile {sup 20}Ne in the nuclear field of the target nucleus {sup 165}Ho.

  20. Inertial Confinement Fusion Experiments & Modeling

    E-Print Network [OSTI]

    Cohen, David

    Inertial Confinement Fusion Experiments & Modeling Using X-ray Absorption Spectroscopy of Thin Does Inertial Confinement Fusion (ICF) Work? A spherical capsule filled with fuel (deuterium Laboratory) #12;Outline I. What is Fusion? II. How does Inertial Fusion work? The physics of indirect

  1. Bemerkungen zur "kalten Fusion"

    E-Print Network [OSTI]

    Rainer W. Kuehne

    2006-04-14

    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.

  2. Bemerkungen zur "kalten Fusion"

    E-Print Network [OSTI]

    Kuehne, R W

    2006-01-01

    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.

  3. An American company thinks it can have a commercial reactor ready and working within a decade ONE of the clichs of nuclear-power research is that a commercial fusion reactor is only 30 years away, and always1

    E-Print Network [OSTI]

    South Bohemia, University of

    of the clichés of nuclear-power research is that a commercial fusion reactor is only 30 years away, and always1An American company thinks it can have a commercial reactor ready and working within a decade ONE that Lockheed Martin,2 a big American engineering and defence company, has a new design for a fusion reactor

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

    SciTech Connect (OSTI)

    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

    2012-05-01

    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.

  5. "50" Years of Fusion Research Fusion Innovation Research and Energy

    E-Print Network [OSTI]

    Classified US Program on Controlled Thermonuclear Fusion (Project Sherwood) carried out until 1958 when"50" Years of Fusion Research Dale Meade Fusion Innovation Research and Energy® Princeton, NJ Fi P th SFusion Fire Powers the Sun "W d t if k f i k ""We need to see if we can make fusion work

  6. Culham Centre for Fusion Energy Fusion -A clean future

    E-Print Network [OSTI]

    Culham Centre for Fusion Energy Fusion - A clean future FUSION REACTION Research at Culham Centre that drives the sun ­ could play a big part in our sustainable energy future. Around the globe, scientists are divided over whether to include nuclear fission in their energy portfolios; and renewable sources

  7. Fusion safety program Annual report, Fiscal year 1995

    SciTech Connect (OSTI)

    Longhurst, G.R.; Cadwallader, L.C.; Carmack, W.J. [and others

    1995-12-01

    This report summarizes the major activities of the Fusion Safety Program in FY-95. The Idaho National Engineering Laboratory (INEL) is the designated lead laboratory, and Lockheed Idaho Technologies Company is the prime contractor for this program. The Fusion Safety Program was initiated in 1979. Activities are conducted at the INEL, at other DOE laboratories, and at other institutions. Among the technical areas covered in this report are tritium safety, beryllium safety, chemical reactions and activation product release, safety aspects of fusion magnet systems, plasma disruptions, risk assessment failure rate database development, and safety code development and application to fusion safety issues. Most of this work has been done in support of the International Thermonuclear Experimental Reactor (ITER). Also included in the report are summaries of the safety and environmental studies performed by the Fusion Safety Program for the Tokamak Physics Experiment and the Tokamak Fusion Test Reactor and the technical support for commercial fusion facility conceptual design studies. A final activity described is work to develop DOE Technical Standards for Safety of Fusion Test Facilities.

  8. Magnetic Confinement Fusion at the Crossroads

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    Matterhorn initiated at Princeton 1950s Classified US Project Sherwood on controlled thermonuclear fusionMagnetic Confinement Fusion at the Crossroads Michael Bell Princeton Plasma Physics Laboratory #12;MGB / UT / 070307 2 The Beginnings of Fusion Energy Research 1928 Concept of fusion reactions

  9. Future Direction of National Fusion Research Tentative translation to English

    E-Print Network [OSTI]

    Future Direction of National Fusion Research (Report) Tentative translation to English Office of Fusion Energy, Research and Development Bureau, MEXT January 8, 2003 Working Group on Fusion Research -----------------------------------------------------------------21 Attachment, Future Direction of National Fusion Research (Synopsis) ---------------28 #12

  10. Learn More about Fusion & Lasers

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Learn More about Fusion & Lasers How Lasers Work Learn how lasers were developed and how they work. Outreach NIF & Photon Science researchers take learning opportunities on the...

  11. FUSION CROSS-SECTIONS AND THE NEW DYNAMICS

    E-Print Network [OSTI]

    Swiatecki, W.J.

    2010-01-01

    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

  12. Converting energy from fusion into useful forms

    E-Print Network [OSTI]

    Kovari, M; Jenkins, I; Kiely, C

    2014-01-01

    If fusion power reactors are to be feasible, it will still be necessary to convert the energy of the nuclear reaction into usable form. The heat produced will be removed from the reactor core by a primary coolant, which might be water, helium, molten lithium-lead, molten lithium-containing salt, or CO2. The heat could then be transferred to a conventional Rankine cycle or Brayton (gas turbine) cycle. Alternatively it could be used for thermochemical processes such as producing hydrogen or other transport fuels. Fusion presents new problems because of the high energy neutrons released. These affect the selection of materials and the operating temperature, ultimately determining the choice of coolant and working cycle. The limited temperature ranges allowed by present day irradiated structural materials, combined with the large internal power demand of the plant, will limit the overall thermal efficiency. The operating conditions of the fusion power source, the materials, coolant, and energy conversion system w...

  13. Investigations of nuclear structure and nuclear reactions induced by complex projectiles

    SciTech Connect (OSTI)

    Sarantites, D.G.

    1990-01-01

    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).

  14. A TUTORIAL ON IGNITION AND GAIN FOR SMALL FUSION TARGETS

    SciTech Connect (OSTI)

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

    2009-07-26

    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.

  15. Fusion excitation function revisited

    E-Print Network [OSTI]

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

    2012-09-28

    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.

  16. Cold nuclear fusion

    SciTech Connect (OSTI)

    Tsyganov, E. N.

    2012-02-15

    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.

  17. Magnetically Catalyzed Fusion

    E-Print Network [OSTI]

    Jeremy S. Heyl; Lars Hernquist

    1996-08-25

    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 ($B \\gsim 10^{12}$G), the reaction rates are many orders of magnitude higher than in the unmagnetized case. The fusion of both protons and deuterons are important over a neutron star's lifetime for ultrastrong magnetic fields ($B \\sim 10^{16}$G). The enhancement may have dramatic effects on thermonuclear runaways and bursts on the surfaces of neutron stars.

  18. Magnetized target fusion and fusion propulsion.

    SciTech Connect (OSTI)

    Kirkpatrick, R. C. (Ronald C.)

    2001-01-01

    Magnetized target fusion (MTF) is a thermonuclear fusion concept that is intermediate between the two mainline approaches, magnetic confinement and inertial confinement fusion (MCF and ICF). MTF incorporates some aspects of each and offers advantages over each of the mainline approaches. First, it provides a means of reducing the driver power requirements, thereby admitting a wider range of drivers than ICF. Second, the magnetic field is only used for insulation, not confinement, and the plasma is wall confined, so that plasma instabilities are traded in for hydrodynamic instabilities. However, the degree of compression required to reach fusion conditions is lower than for ICF, so that hydrodynamic instabilities are much less threatening. The standoff driver innovation proposes to dynamically form the target plasma and a gaseous shell that compresses and confines the target plasma. Therefore, fusion target fabrication is traded in for a multiplicity of plasma guns, which must work in synchrony. The standoff driver embodiment of MTF leads to a fusion propulsion system concept that is potentially compact and lightweight. We will discuss the underlying physics of MTF and some of the details of the fusion propulsion concept using the standoff driver approach. We discuss here the optimization of an MTF target design for space propulsion.

  19. Systematics of heavy-ion fusion hindrance at extreme sub-barrier energies

    E-Print Network [OSTI]

    C. L. Jiang; B. B. Back; H. Esbensen; R. V. F. Janssens; abd K. E. Rehm

    2005-08-01

    The recent discovery of hindrance in heavy-ion induced fusion reactions at extreme sub-barrier energies represents a challenge for theoretical models. Previously, it has been shown that in medium-heavy systems, the onset of fusion hindrance depends strongly on the "stiffness" of the nuclei in the entrance channel. In this work, we explore its dependence on the total mass and the $Q$-value of the fusing systems and find that the fusion hindrance depends in a systematic way on the entrance channel properties over a wide range of systems.

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

    E-Print Network [OSTI]

    Ellison, Paul Andrew

    2011-01-01

    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

  1. Some Calculations for Cold Fusion Superheavy Elements

    E-Print Network [OSTI]

    Zhong, X H; Ning, P Z

    2004-01-01

    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.

  2. Some Calculations for Cold Fusion Superheavy Elements

    E-Print Network [OSTI]

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

    2004-10-18

    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.

  3. ACCELERATOR & FUSION RESEARCH DIV. ANNUAL REPORT, OCT. 79 - SEPT. 80

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    11, 1980, p. 725. MAGNETIC FUSION ENERGY Staff W. Kunkel andsupport) Accelerator and Fusion Research Division N.Abt Y.Wong J. Zatver HEAVY ION FUSION Work continued during FY80

  4. The reality of cold fusion

    SciTech Connect (OSTI)

    Case, L.C. (Eltron, Inc., Winchester, MA (US))

    1991-12-01

    Despite the unreproducibility, doubt, and controversy involved in the question of the cold fusion of deuterium, enough good data have been published to clearly indicate the reality of some sort of nuclear fusion. Yamaguchi and Niushioka reported a thrice-repeated event in which large amounts of heat and definite bursts of neutrons evolved simultaneously with considerable out-gassing of absorbed deuterium. These results are consistent with nuclear fusion and not with a chemical reaction. In this paper a detailed mechanism is proposed that is consistent with these events and that also generally explains many of the scattered indications of cold fusion that have been reported. There must be an adventitiously large enough presence of tritium to initiate the nuclear reaction. The results of previously successful experiments cannot now be reproduced because currently available D{sub 2}O (and D{sub 2}) is so low in adventitious tritium as to preclude initiation of the nuclear reaction.

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

    SciTech Connect (OSTI)

    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

    2013-06-18

    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.

  6. Disproving the Fusion Hypothesis: An Analysis of Data Fusion via Effective Information Retrieval Strategies

    E-Print Network [OSTI]

    Disproving the Fusion Hypothesis: An Analysis of Data Fusion via Effective Information Retrieval devoted to the basic idea that data fusion techniques can improve retrieval effectiveness. Recent work to effectiveness improvements have not been made clear. We examine popular data fusion techniques designed

  7. Topical Area MFE Title: Burning Plasma Science_____________________________________________ Description Fusion energy is released by burning light elements using nuclear reactions which consume mass and

    E-Print Network [OSTI]

    Page 1 Topical Area MFE Title: Burning Plasma Science but higher temperatures and better confinement is required. In magnetic fusion, plasmas are heated-sustained purely by its alpha particle heating. The science of burning plasmas consists of: (1) the physics

  8. Z-inertial fusion energy: power plant final report FY 2006.

    SciTech Connect (OSTI)

    Anderson, Mark (University of Wisconsin, Madison, WI); Kulcinski, Gerald (University of Wisconsin, Madison, WI); Zhao, Haihua (University of California, Berkeley, CA); Cipiti, Benjamin B.; Olson, Craig Lee; Sierra, Dannelle P.; Meier, Wayne (Lawrence Livermore National Laboratories); McConnell, Paul E.; Ghiaasiaan, M. (Georgia Institute of Technology, Atlanta, GA); Kern, Brian (Georgia Institute of Technology, Atlanta, GA); Tajima, Yu (University of California, Los Angeles, CA); Campen, Chistopher (University of California, Berkeley, CA); Sketchley, Tomas (University of California, Los Angeles, CA); Moir, R (Lawrence Livermore National Laboratories); Bardet, Philippe M. (University of California, Berkeley, CA); Durbin, Samuel; Morrow, Charles W.; Vigil, Virginia L (University of Wisconsin, Madison, WI); Modesto-Beato, Marcos A.; Franklin, James Kenneth (University of California, Berkeley, CA); Smith, James Dean; Ying, Alice (University of California, Los Angeles, CA); Cook, Jason T.; Schmitz, Lothar (University of California, Los Angeles, CA); Abdel-Khalik, S. (Georgia Institute of Technology, Atlanta, GA); Farnum, Cathy Ottinger; Abdou, Mohamed A. (University of California, Los Angeles, CA); Bonazza, Riccardo (University of Wisconsin, Madison, WI); Rodriguez, Salvador B.; Sridharan, Kumar (University of Wisconsin, Madison, WI); Rochau, Gary Eugene; Gudmundson, Jesse (University of Wisconsin, Madison, WI); Peterson, Per F. (University of California, Berkeley, CA); Marriott, Ed (University of Wisconsin, Madison, WI); Oakley, Jason (University of Wisconsin, Madison, WI)

    2006-10-01

    This report summarizes the work conducted for the Z-inertial fusion energy (Z-IFE) late start Laboratory Directed Research Project. A major area of focus was on creating a roadmap to a z-pinch driven fusion power plant. The roadmap ties ZIFE into the Global Nuclear Energy Partnership (GNEP) initiative through the use of high energy fusion neutrons to burn the actinides of spent fuel waste. Transmutation presents a near term use for Z-IFE technology and will aid in paving the path to fusion energy. The work this year continued to develop the science and engineering needed to support the Z-IFE roadmap. This included plant system and driver cost estimates, recyclable transmission line studies, flibe characterization, reaction chamber design, and shock mitigation techniques.

  9. Simulation of Fusion Plasmas

    ScienceCinema (OSTI)

    Holland, Chris [UC San Diego, San Diego, California, United States

    2010-01-08

    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.

  10. Sub-barrier Fusion Cross Sections with Energy Density Formalism

    E-Print Network [OSTI]

    F. Muhammad Zamrun; K. Hagino; N. Takigawa

    2006-06-07

    We discuss the applicability of the energy density formalism (EDF) for heavy-ion fusion reactions at sub-barrier energies. For this purpose, we calculate the fusion excitation function and the fusion barrier distribution for the reactions of $^{16}$O with $^{154,}$$^{144}$Sm,$^{186}$W and $^{208}$Pb with the coupled-channels method. We also discuss the effect of saturation property on the fusion cross section for the reaction between two $^{64}$Ni nuclei, in connection to the so called steep fall-off phenomenon of fusion cross sections at deep sub-barrier energies.

  11. Bayesian fusion of multi-band image fusion Bayesian fusion of multi-band image fusion

    E-Print Network [OSTI]

    Tourneret, Jean-Yves

    Bayesian fusion of multi-band image fusion Bayesian fusion of multi-band image fusion Beyond for Latent Variables", Feb. 2-4 2015 1 / 64 #12;Bayesian fusion of multi-band image fusion Context Multi School "Search for Latent Variables", Feb. 2-4 2015 2 / 64 #12;Bayesian fusion of multi-band image fusion

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

    DOE Patents [OSTI]

    Lasche, George P. (Arlington, VA)

    1988-01-01

    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.

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

    DOE Patents [OSTI]

    Lasche, G.P.

    1987-02-20

    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.

  14. Assisted fusion

    E-Print Network [OSTI]

    German Kälbermann

    2009-10-19

    A model of nuclear fusion consisting of a wave packet impinging into a well located between square one dimensional barriers is treated analytically. The wave function inside the well is calculated exactly for the assisted tunneling induced by a perturbation mimicking a constant electric field with arbitrary time dependence. Conditions are found for the enhancement of fusion.

  15. Fusion Safety Program annual report, Fiscal Year 1993

    SciTech Connect (OSTI)

    Longhurst, G.R.; Cadwallader, L.C.; Dolan, T.J.; Herring, J.S.; McCarthy, K.A.; Merrill, B.J.; Motloch, C.G.; Petti, D.A.

    1993-12-01

    This report summarizes the major activities of the Fusion Safety Program in Fiscal Year 1993. The Idaho National Engineering Laboratory (INEL) has been designated by DOE as the lead laboratory for fusion safety, and EG&G Idaho, Inc., is the prime contractor for INEL operations. The Fusion Safety Program was initiated in 1979. Activities are conducted at the INEL and in participating organizations, including universities and private companies. Technical areas covered in the report include tritium safety, beryllium safety, activation product release, reactions involving potential plasma-facing materials, safety of fusion magnet systems, plasma disruptions and edge physics modeling, risk assessment failure rates, computer codes for reactor transient analysis, and regulatory support. These areas include work completed in support of the International Thermonuclear Experimental Reactor (ITER). Also included in the report are summaries of the safety and environmental studies performed at the INEL for the Tokamak Physics Experiment and the Tokamak Fusion Test Reactor projects at the Princeton Plasma Physics Laboratory and a summary of the technical support for the ARIES/PULSAR commercial reactor design studies.

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

    E-Print Network [OSTI]

    Gates, Jacklyn M.

    2008-01-01

    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

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

    E-Print Network [OSTI]

    Dragojevic, I.

    2008-01-01

    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

  18. Proton-proton fusion in lattice effective field theory

    E-Print Network [OSTI]

    Gautam Rupak; Pranaam Ravi

    2014-11-10

    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.

  19. China To Build Its Own Fusion Reactor ENERGY TECH

    E-Print Network [OSTI]

    Thermonuclear Experimental Reactor project reached agreement in Moscow Tuesday to construct the first fusion devices in thermonuclear reaction," and that "Chinese scientists started to develop a fusion operationChina To Build Its Own Fusion Reactor ENERGY TECH by Edward Lanfranco Beijing (UPI) July 1, 2005

  20. Dynamic Instruction Fusion

    E-Print Network [OSTI]

    Lee, Ian

    2012-01-01

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

  1. Fusion Power Associates Awards

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (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...

  2. Deuterium concentration and cold fusion; Rate distributions in palladium

    SciTech Connect (OSTI)

    Rogers, V.C.; Sandquist, G.M.; Nielson, K.K. )

    1989-12-01

    Cold fusion reactions and excess heat production have been reported in the electrolysis of heavy water with a palladium metal cathode. Solution of the standard diffusion equation for deuterium without fusion indicates that the deuterium concentration distribution rapidly becomes constant in the palladium lattice. Solution of the nonlinear diffusion equation for deuterium undergoing fusion also gives constant deuterium concentrations, suggesting that any fusion occurs uniformly throughout the palladium lattice. The hypothesis that fusion reactions occur predominantly at the palladium surface is shown to be inconsistent with experimental data.

  3. RSNA 2002: Image Fusion Image Fusion

    E-Print Network [OSTI]

    Pelizzari, Charles A.

    RSNA 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 and limitations) ·Where do we need to go? (future directions) #12;RSNA 2002: Image Fusion Terminology

  4. Fusion Induced by Radioactive Ion Beams

    E-Print Network [OSTI]

    J. F. Liang; C. Signorini

    2005-04-26

    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.

  5. Fusion breeder: its potential role and prospects

    SciTech Connect (OSTI)

    Lee, J.D.

    1981-01-01

    The fusion breeder is a concept that utilizes 14 MeV neutrons from D + T ..-->.. n(14.1 MeV) + ..cap alpha..(3.5 MeV) fusion reactions to produce more fuel than the tritium (T) needed to sustain the fusion process. This excess fuel production capacity is used to produce fissile material (Pu-239 or U-233) for subsequent use in fission reactors. We are concentrating on a class of blankets we call fission suppressed. The blanket is the region surrounding the fusion plasma in which fusion neutrons interact to produce fuel and heat. The fission-suppressed blanket uses non-fission reactions (mainly (n,2n) or (n,n't)) to generate excess neutrons for the production of net fuel. This is in contrast to the fast fission class of blankets which use (n,fiss) reactions to generate excess neutrons. Fusion reactors with fast fission blankets are commony known as fusion-fission hybrids because they combine fusion and fission in the same device.

  6. HEAVY ION INERTIAL FUSION

    E-Print Network [OSTI]

    Keefe, D.

    2008-01-01

    from present practice. Inertial Confinement Fusion While forReactors for Inertial Confinement Fusion, K.A. Brueckner (

  7. Fusion of Neutron-Rich O Ions on a Carbon Target at Near-Barrier Energies

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    Fusion of Neutron-Rich O Ions on a Carbon Target at Near-Barrier Energies Indiana University: M in the outer crust · Superbursts observed for accreting neutron stars · Fusion of neutron-rich light nuclei as a possible heat source in neutron star crust Fusion cross-section · Dynamics of fusion reaction with neutron

  8. Annual Report of the EURATOM/UKAEA Fusion Programme 2007/08 2 General Introduction

    E-Print Network [OSTI]

    Introduction 2.1 FUSION ENERGY RESEARCH 2.1.1 FUSION FOR ENERGY PRODUCTION Fusion is the fundamental energy source of the universe; it is the process that powers the sun and the stars. In a fusion reaction, light atoms fuse together at extremely high temperatures. During this process, a lot of energy is released

  9. Effect of a Generalized Particle Momentum Distribution on Plasma Nuclear Fusion Rates Yeong E. KIM

    E-Print Network [OSTI]

    Pyrak-Nolte, Laura J.

    Effect of a Generalized Particle Momentum Distribution on Plasma Nuclear Fusion Rates Yeong E. KIM-analytical formula for nuclear fusion reaction rate between nuclei in a plasma (quantum plasma nuclear fusion] KEYWORDS: generalized particle momentum distribution, quantum plasma nuclear fusion As shown by Galitskii

  10. How Solar Works | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    Fusion Energy Works 33 likes Fusion energy is the energy source of the sun and all of the stars. As part of How Energy Works, we'll cover everything from fuel sources to plasma...

  11. Inertial fusion energy: A clearer view of the environmental and safety perspectives

    SciTech Connect (OSTI)

    Latkowski, J.F.

    1996-11-01

    If fusion energy is to achieve its full potential for safety and environmental (S&E) advantages, the S&E characteristics of fusion power plant designs must be quantified and understood, and the resulting insights must be embodied in the ongoing process of development of fusion energy. As part of this task, the present work compares S&E characteristics of five inertial and two magnetic fusion power plant designs. For each design, a set of radiological hazard indices has been calculated with a system of computer codes and data libraries assembled for this purpose. These indices quantify the radiological hazards associated with the operation of fusion power plants with respect to three classes of hazard: accidents, occupational exposure, and waste disposal. The three classes of hazard have been qualitatively integrated to rank the best and worst fusion power plant designs with respect to S&E characteristics. From these rankings, the specific designs, and other S&E trends, design features that result in S&E advantages have been identified. Additionally, key areas for future fusion research have been identified. Specific experiments needed include the investigation of elemental release rates (expanded to include many more materials) and the verification of sequential charged-particle reactions. Improvements to the calculational methodology are recommended to enable future comparative analyses to represent more accurately the radiological hazards presented by fusion power plants. Finally, future work must consider economic effects. Trade-offs among design features will be decided not by S&E characteristics alone, but also by cost-benefit analyses. 118 refs., 35 figs., 35 tabs.

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

    E-Print Network [OSTI]

    Gates, Jacklyn M.

    2008-01-01

    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.

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

    E-Print Network [OSTI]

    Gates, Jacklyn M.

    2008-01-01

    separator for the study of fusion reaction products."by heavy-ion induced fusion?" Zeitschrift Fur Physik a-J. Wilczy?ski (2003). "Fusion by Diffusion." Acta Physica

  14. Fusion genes in breast cancer

    E-Print Network [OSTI]

    Batty, Elizabeth

    2012-02-07

    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...

  15. EURATOM/CCFE Fusion Association Annual Report

    E-Print Network [OSTI]

    Agreement's roadmap, published in early 2013, is the path to a fusion future and we look forward at CCFE to working with our European partners to implementing it. EFDA's hard work in developing the roadmap has been

  16. Fusion Research in Europe Tony Donn for EUROfusion

    E-Print Network [OSTI]

    ) in 27 European countries working together to achieve the ultimate goal of the Fusion Roadmap EUROfusion A roadmap to the realisation of fusion energy A.J.H. Donné | FPA | Washington DC | 16th December 2014 ITER

  17. Nuclear Fusion via Triple Collisions in Solar Plasma

    E-Print Network [OSTI]

    V. B. Belyaev; D. E. Monakhov; N. Shevchenko; S. A. Sofianos; S. A. Rakityansky; M. Braun; L. L. Howell; W. Sandhas

    1997-09-09

    We consider several nuclear fusion reactions that take place at the center of the sun, which are omitted in the standard pp-chain model. More specifically the reaction rates of the nonradiative production of ^3He, ^7Be, and ^8B nuclei in triple collisions involving electrons are estimated within the framework of the adiabatic approximation. These rates are compared with those of the corresponding binary fusion reactions.

  18. Block theory Fusion systems

    E-Print Network [OSTI]

    Block theory Fusion systems Results Block theory and fusion systems Benjamin Sambale Jena 02. 05. 2011 Benjamin Sambale Block theory and fusion systems #12;Block theory Fusion systems Results Blocks closed field of characteristic p. Benjamin Sambale Block theory and fusion systems #12;Block theory

  19. Introduction Minimal Fusion Systems

    E-Print Network [OSTI]

    Thévenaz, Jacques

    Introduction Minimal Fusion Systems Maximal Parabolics Results Minimal Fusion Systems Ellen Henke University of Birmingham Ellen Henke Minimal Fusion Systems #12;Introduction Minimal Fusion Systems Maximal Parabolics Results Contents 1 Introduction 2 Minimal Fusion Systems 3 Maximal Parabolics 4 Results Ellen

  20. Sensor fusion for intelligent process control.

    SciTech Connect (OSTI)

    Connors, John J. (PPG Industries, Inc., Harmar Township, PA); Hill, Kevin (PPG Industries, Inc., Harmar Township, PA); Hanekamp, David (PPG Industries, Inc., Harmar Township, PA); Haley, William F. (PPG Industries, Inc., Wichita Falls, TX); Gallagher, Robert J.; Gowin, Craig (PPG Industries, Inc., Batavia, IL); Farrar, Arthur R. (PPG Industries, Inc., Wichita Falls, TX); Sheaffer, Donald A.; DeYoung, Mark A. (PPG Industries, Inc., Mt. Zion, IL); Bertram, Lee A.; Dodge, Craig (PPG Industries, Inc., Mt. Zion, IL); Binion, Bruce (PPG Industries, Inc., Mt. Zion, IL); Walsh, Peter M.; Houf, William G.; Desam, Padmabhushana R. (University of Utah, Salt Lake City, UT); Tiwary, Rajiv (PPG Industries, Inc., Harmar Township, PA); Stokes, Michael R. (PPG Industries, Inc.); Miller, Alan J. (PPG Industries, Inc., Mt. Zion, IL); Michael, Richard W. (PPG Industries, Inc., Lincoln, AL); Mayer, Raymond M. (PPG Industries, Inc., Harmar Township, PA); Jiao, Yu (PPG Industries, Inc., Harmar Township, PA); Smith, Philip J. (University of Utah, Salt Lake City, UT); Arbab, Mehran (PPG Industries, Inc., Harmar Township, PA); Hillaire, Robert G.

    2004-08-01

    An integrated system for the fusion of product and process sensors and controls for production of flat glass was envisioned, having as its objective the maximization of throughput and product quality subject to emission limits, furnace refractory wear, and other constraints. Although the project was prematurely terminated, stopping the work short of its goal, the tasks that were completed show the value of the approach and objectives. Though the demonstration was to have been done on a flat glass production line, the approach is applicable to control of production in the other sectors of the glass industry. Furthermore, the system architecture is also applicable in other industries utilizing processes in which product uniformity is determined by ability to control feed composition, mixing, heating and cooling, chemical reactions, and physical processes such as distillation, crystallization, drying, etc. The first phase of the project, with Visteon Automotive Systems as industrial partner, was focused on simulation and control of the glass annealing lehr. That work produced the analysis and computer code that provide the foundation for model-based control of annealing lehrs during steady state operation and through color and thickness changes. In the second phase of the work, with PPG Industries as the industrial partner, the emphasis was on control of temperature and combustion stoichiometry in the melting furnace, to provide a wider operating window, improve product yield, and increase energy efficiency. A program of experiments with the furnace, CFD modeling and simulation, flow measurements, and sensor fusion was undertaken to provide the experimental and theoretical basis for an integrated, model-based control system utilizing the new infrastructure installed at the demonstration site for the purpose. In spite of the fact that the project was terminated during the first year of the second phase of the work, the results of these first steps toward implementation of model-based control were sufficient to demonstrate the value of the approach to improving the productivity of glass manufacture.

  1. HEAVY ION INERTIAL FUSION

    E-Print Network [OSTI]

    Keefe, D.

    2008-01-01

    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

  2. NATURE | NEWS Laser fusion nears crucial milestone

    E-Print Network [OSTI]

    of `inertial confinement' fusion -- faces an uncertain future. Would success mean that the US Department National Laboratory in New Mexico, agrees, saying that scientists working on inertial confinement should to the troubles that have plagued a competing approach to fusion -- magnetic confinement -- and its flagship

  3. data fusion 15 June 2012

    E-Print Network [OSTI]

    Tourneret, Jean-Yves

    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

  4. Fusion Energy Sciences

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Fusion Energy Sciences Fusion Energy Sciences Expanding the fundamental understanding of matter at very high temperatures and densities and to build the scientific foundation...

  5. Whyte, IAP 2015, MIT MIT Plasma Science & Fusion Center

    E-Print Network [OSTI]

    1 Whyte, IAP 2015, MIT MIT Plasma Science & Fusion Center Fusion Energy: How it works, Why we of light nuclei is the energy source of stars, and basically, the universe #12;4 Whyte, IAP 2015, MIT Fusion is a re-arrangement of nuclei that releases net energy. #12;5 Whyte, IAP 2015, MIT Nuclear

  6. Fusion systems on bicyclic 2-groups Benjamin Sambale

    E-Print Network [OSTI]

    Fusion systems on bicyclic 2-groups Benjamin Sambale January 28, 2014 Abstract We classify all (saturated) fusion systems on bicyclic 2-groups. Here, a bicyclic group is a product of two cyclic subgroups. This extends previous work on fusion systems on metacyclic 2-groups (see [Craven-Glesser, 2012] and [Sambale

  7. Braided Fusion Categories First Conjecture

    E-Print Network [OSTI]

    Rowell, Eric C.

    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

  8. IOP PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 50 (2010) 014002 (10pp) doi:10.1088/0029-5515/50/1/014002

    E-Print Network [OSTI]

    2010-01-01

    IOP PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 50 (2010) 014002, the nuclear reaction which powers the sun and stars, would provide mankind with a safe, environmentally (10pp) doi:10.1088/0029-5515/50/1/014002 ITER on the road to fusion energy Kaname Ikeda Director

  9. How Solar Works | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    Sort by: Random | Alphabetical | Rating (High to Low) | Rating (Low to High) How Fusion Energy Works 33 likes Fusion energy is the energy source of the sun and all of the stars....

  10. Stabilized Spheromak Fusion Reactors

    SciTech Connect (OSTI)

    Fowler, T

    2007-04-03

    The U.S. fusion energy program is focused on research with the potential for studying plasmas at thermonuclear temperatures, currently epitomized by the tokamak-based International Thermonuclear Experimental Reactor (ITER) but also continuing exploratory work on other plasma confinement concepts. Among the latter is the spheromak pursued on the SSPX facility at LLNL. Experiments in SSPX using electrostatic current drive by coaxial guns have now demonstrated stable spheromaks with good heat confinement, if the plasma is maintained near a Taylor state, but the anticipated high current amplification by gun injection has not yet been achieved. In future experiments and reactors, creating and maintaining a stable spheromak configuration at high magnetic field strength may require auxiliary current drive using neutral beams or RF power. Here we show that neutral beam current drive soon to be explored on SSPX could yield a compact spheromak reactor with current drive efficiency comparable to that of steady state tokamaks. Thus, while more will be learned about electrostatic current drive in coming months, results already achieved in SSPX could point to a productive parallel development path pursuing auxiliary current drive, consistent with plans to install neutral beams on SSPX in the near future. Among possible outcomes, spheromak research could also yield pulsed fusion reactors at lower capital cost than any fusion concept yet proposed.

  11. Influence of projectile - breakup threshold on complete fusion

    E-Print Network [OSTI]

    A. Mukherjee; Subinit Roy; M. K. Pradhan; M. Saha Sarkar; P. Basu; B. Dasmahapatra; T. Bhattacharya; S. Bhattacharya; S. K. Basu; A. Chatterjee; V. Tripathi; S. Kailas

    2006-03-24

    Complete fusion excitations for 11,10B+159Tb have been measured at energies around the respective Coulomb barriers, and the existing complete fusion measurements for 7Li+159Tb have been extended to higher energies. The measurements show significant reduction of complete fusion cross sections at above-barrier energies for both the reactions, 10B+159Tb and 7Li+159Tb, when compared to those for 11B+159Tb. The comparison shows that the extent of suppression of complete fusion cross sections is correlated with the -separation energies of the projectiles. Also, the two reactions, 10B+159Tb and 7Li+159Tb were found to produce incomplete fusion products at energies near the respective Coulomb barriers, with the - particle emitting channel being the favoured incomplete fusion process in both the cases.

  12. 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

  13. Fusion pumped light source

    DOE Patents [OSTI]

    Pappas, Daniel S. (Los Alamos, NM)

    1989-01-01

    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.

  14. COLLOQUIUM: Magnetized Target Fusion Work at General Fusion | Princeton

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room News PublicationsAudits &BradburyMay 1, 2013, 4:15pm Colloquia MBGLab December

  15. About sponsorship Fusion power

    E-Print Network [OSTI]

    About sponsorship Fusion power Nuclear ambitions Jun 30th 2005 From The Economist print edition project to build a nuclear-fusion reactor came a step closer to reality when politicians agreed it should century, fusion advocates have claimed that achieving commercial nuclear fusion is 30 years away

  16. Framework for a Road Map to Magnetic Fusion Energy Status Report

    E-Print Network [OSTI]

    January 14, 2014 #12;Why Work on a Fusion Roadmap Now? · To demonstrate that there are realistic technical

  17. Physics of Superthermal Ions in Tokamak Fusion Test Reactor Plasmas

    E-Print Network [OSTI]

    Budny, Robert

    --General Atomics, M. Petrov--Ioffe Institute, D. Spong--ORNL Abstract In magnetically-confined fusion plasmas, superthermal ions with typical energies of tens to hundreds of keV are often used to heat the plasma to temperatures where the fusion reaction rate is significant, ie Ti>5 keV. These ions can originate from

  18. Alloy Design for a Fusion Power Plant Richard Kemp

    E-Print Network [OSTI]

    Cambridge, University of

    Alloy Design for a Fusion Power Plant Richard Kemp Gonville and Caius College University, The Hunting Of The Snark #12;Abstract Fusion power is generated when hot deuterium and tritium nuclei react by the surrounding material struc- ture of the plant, transferring the heat of the reaction to an external cooling

  19. Nuclear astrophysical plasmas: ion distribution functions and fusion rates

    E-Print Network [OSTI]

    Marcello Lissia; Piero Quarati

    2005-11-15

    This article illustrates how very small deviations from the Maxwellian exponential tail, while leaving unchanged bulk quantities, can yield dramatic effects on fusion reaction rates and discuss several mechanisms that can cause such deviations.

  20. InFusionIssue 01 |Spring 2011 www.ccfe.ac.uk

    E-Print Network [OSTI]

    ) InFusion Issue 01 | Spring 2011 The work at CCFE is funded by the RCUK Energy Programme and EURATOM-11 Welcome This is the first issue of the new publication InFusion from the Culham Centre for Fusion Energy in 2019. Details of these projects are explained in this first edition of InFusion, together with articles

  1. Applied Multi-Dimensional Fusion (A. Mahmood, P.M. Tudor)

    E-Print Network [OSTI]

    Mitianoudis, Nikolaos

    and hyper-spectral fusion. The paper presents a wide work base in multi-dimensional fusion that is beingApplied Multi-Dimensional Fusion (A. Mahmood, P.M. Tudor) , W. Oxford , R. Hansford (J.D B. Nelson to showcase the practical application of some of the best multi-dimensional fusion research in the United

  2. Senator Dianne Feinstein Statement on the Fusion Energy Sciences Act of 2001

    E-Print Network [OSTI]

    . Unlike fossil fuels, which pollute the air when burned, the only byproduct in a hydrogen fusion reaction and polluting. Beyond expanding renewable energy sources such as those from the sun and the wind, fusion holds is helium -- an element already plentiful in the air. Besides being environmentally benign, fusion

  3. Measuring the fusion of neutron-rich light nuclei at and below the

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    Neutron Stars The crust of an accreting neutron star is a unique environment for nuclear reactions. FusionMeasuring the fusion of neutron-rich light nuclei at and below the Coulomb barrier SYLVIE HUDAN August , 2012 #12;Fusion of neutron-rich light nuclei at and below the Coulomb barrierSylvie Hudan

  4. Using fusion-product spectroscopy to study inertial fusion implosions, stopping power, and astrophysical nucleosynthesis at OMEGA and the NIF

    E-Print Network [OSTI]

    Zylstra, Alex B

    2015-01-01

    By measuring energetic charged-particle products from fusion reactions occurring in plasmas, nuclear diagnostics can be used to study the properties of the burning plasma, as a probe of the plasma, or of the fundamental ...

  5. Prospects for fusion neutron NPLs

    SciTech Connect (OSTI)

    Petra, M.; Miley, G.H.; Batyrbekov, E.; Jassby, D.L.; McArthur, D. [Fusion Studies Laboratory, University of Illinois, 100 NEL, 103 South Goodwin Avenue, Urbana, Illinois 61801-2984 (United States)

    1996-05-01

    To date, nuclear pumped lasers (NPLs) have been driven by neutrons from pulsed research fission reactors. However, future applications using either a Magnetic Confinement Fusion (MCF) neutron source or an Inertial Confinement Fusion (ICF) source appear attractive. One unique combination proposed earlier would use a neutron feedback NPL driver in an ICF power plant. 14-MeV D-T neutrons (and 2.5-MeV D-D neutrons) provide a unique opportunity for a neutron recoil pumped NPL. Alternatively, these neutrons can be thermalized to provide thermal-neutron induced reactions for pumping. Initial experience with a fusion-pumped NPL can possibly be obtained using the D-T burn experiments in progress/planning at the Tokamak Fusion Test Reactor (TFTR) and Joint European Torus (JET) tokamak devices or at the planned National Ignition Facility (NIF) high-gain ICF target experimental facility. With neutron fluxes presently available, peak thermalized fluxes at a test laser in the shield region could exceed 10{sup 14} n/cm{sup 2}/sec. Several low-threshold NPLs might be utilized in such an experiment, including the He-Ne-H{sub 2} NPL and the Ar-Xe NPL. Experimental set-ups for both the tokamak and the NIF will be described. {copyright} {ital 1996 American Institute of Physics.}

  6. Fusion Energy Sciences Network Requirements

    E-Print Network [OSTI]

    Dart, Eli

    2014-01-01

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

  7. Fusion for Earth and Space

    SciTech Connect (OSTI)

    Williams, Pharis E

    2009-03-16

    The compact reactor concept (Williams, 2007) has the potential to provide clean, safe and unlimited supply of energy for Earth and Space applications. The concept is a potential fusion reactor wherein deuterium nuclei are preferentially fused into helium nuclei. Because the deuterium nuclei are preferentially fused into helium nuclei at temperatures and energies lower than specified by the standard model there is no harmful radiation as a byproduct of this fusion process. Therefore, a reactor using this reaction does not need any shielding to contain such radiation. The energy released from each reaction and the absence of shielding makes the deuterium-plus-deuterium-to-helium (DDH) reactor very compact when compared to other reactors, both fission and fusion types. Moreover, the potential energy output per reactor weight and the absence of harmful radiation makes the DDH reactor an ideal candidate for individual home and space power. The concept also would make it possible for each plant or remote location to have it's own power source, on site, without the need for a connection to the power grid. This would minimize, or eliminate, power blackouts. The concept could replace large fission reactors and fossil fuel power plants plus provide energy for ships, locomotives, trucks and autos. It would make an ideal source of energy for space power applications and for space propulsion.

  8. Microscopic study of Ca$+$Ca fusion

    E-Print Network [OSTI]

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

    2012-02-17

    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.

  9. Engineering Challenges in Antiproton Triggered Fusion Propulsion

    SciTech Connect (OSTI)

    Cassenti, Brice [Department. of Engineering and Science, Rensselaer Polytechnic Institute, 275 Windsor Avenue, Hattford, CT 06120 (United States); Kammash, Terry [Nuclear Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States)

    2008-01-21

    During the last decade antiproton triggered fusion propulsion has been investigated as a method for achieving high specific impulse, high thrust in a nuclear pulse propulsion system. In general the antiprotons are injected into a pellet containing fusion fuel with a small amount of fissionable material (i.e., an amount less than the critical mass) where the products from the fission are then used to trigger a fusion reaction. Initial calculations and simulations indicate that if magnetically insulated inertial confinement fusion is used that the pellets should result in a specific impulse of between 100,000 and 300,000 seconds at high thrust. The engineering challenges associated with this propulsion system are significant. For example, the antiprotons must be precisely focused. The pellet must be designed to contain the fission and initial fusion products and this will require strong magnetic fields. The fusion fuel must be contained for a sufficiently long time to effectively release the fusion energy, and the payload must be shielded from the radiation, especially the excess neutrons emitted, in addition to many other particles. We will review the recent progress, possible engineering solutions and the potential performance of these systems.

  10. Nuclear diagnostics for inertial confinement fusion implosions

    SciTech Connect (OSTI)

    Murphy, T.J.

    1997-11-01

    This abstract contains viewgraphs on nuclear diagnostic techniques for inertial confinement fusion implosions. The viewgraphs contain information on: reactions of interest in ICF; advantages and disadvantages of these methods; the properties nuclear techniques can measure; and some specifics on the detectors used.

  11. Individual Reactions of Permanganate and Various Reductants - Student Report to the DOE ERULF Program for Work Conducted May to July 2000

    SciTech Connect (OSTI)

    Gauger, Amber M.; Hallen, Richard T.

    2012-09-15

    Tank waste on the Hanford Site contains radioactive elements that need to be removed from solution prior to disposal. One effective way to do this is to precipitate the radioactive elements with manganese solids, produced by permanganate oxidation. When added to tank waste, the permanganate reacts quickly producing manganese (IV) dioxide precipitate. Because of the speed of the reaction it is difficult to tell what exactly is happening. Individual reactions using non-radioactive reductants found in the tanks were done to determine reaction kinetics, what permanganate was reduced to, and what oxidation products were formed. In this project sodium formate, sodium nitrite, glycolic acid, glycine, and sodium oxalate were studied using various concentrations of reductant in alkaline sodium hydroxide solutions. It was determined that formate reacted the quickest, followed by glycine and glycolic acid. Oxalate and nitrite did not appear to react with the permanganate solutions. The products of the oxidation reaction were examined. Formate was oxidized to carbonate and water. Glycolic acid was oxidized slower producing oxalate and water. Glycine reactions formed some ammonia in solution, oxalate, and water. The research reported by Amber Gauger in this report was part of a DOE ERULF student intern program at Pacific Northwest National Laboratory under the direction of Richard Hallen in the summer of 2000.

  12. 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

  13. Fusion Energy Program Presentation to

    E-Print Network [OSTI]

    Physics GPPJPrograrn Direction TotalMFE Inertial Fusion Energy Less ProductivitySavings TotalFusion Energy

  14. Fusion Nuclear Science | ORNL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Fusion Nuclear Science Isotope Development and Production Nuclear Security Science & Technology Nuclear Systems Modeling, Simulation & Validation Nuclear Systems Technology...

  15. Fusion: Intro Fusion: Numerics and Asymptotics Fusion: Summary Superconductor: Problem Superconductor: Results Investigation into the Feasibility and

    E-Print Network [OSTI]

    Fournier, John J.F.

    Fusion: Intro Fusion: Numerics and Asymptotics Fusion: Summary Superconductor: Problem Superconductor: Results Investigation into the Feasibility and Operation of a Magnetized Target Fusion Reactor, Committee Member May 7, 2015 Michael Lindstrom Magnetized Target Fusion and Field Perturbations #12;Fusion

  16. 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 · ORNL Instrumental in formulating and fostering this multi-disciplinary area

  17. Fusion heating technology

    SciTech Connect (OSTI)

    Cole, A.J.

    1982-06-01

    John Lawson established the criterion that in order to produce more energy from fusion than is necessary to heat the plasma and replenish the radiation losses, a minimum value for both the product of plasma density and confinement time t, and the temperature must be achieved. There are two types of plasma heating: neutral beam and electromagnetic wave heating. A neutral beam system is shown. Main development work on negative ion beamlines has focused on the difficult problem of the production of high current sources. The development of a 30 keV-1 ampere multisecond source module is close to being accomplished. In electromagnetic heating, the launcher, which provides the means of coupling the power to the plasma, is most important. The status of heating development is reviewed. Electron cyclotron resonance heating (ECRH), lower hybrid heating (HHH), and ion cyclotron resonance heating (ICRH) are reviewed.

  18. Chamber Design for the Laser Inertial Fusion Energy (LIFE) Engine

    SciTech Connect (OSTI)

    Latkowski, J F; Abbott, R P; Aceves, S; Anklam, T; Badders, D; Cook, A W; DeMuth, J; Divol, L; El-Dasher, B; Farmer, J C; Flowers, D; Fratoni, M; ONeil, R G; Heltemes, T; Kane, J; Kramer, K J; Kramer, R; Lafuente, A; Loosmore, G A; Morris, K R; Moses, G A; Olson, B; Pantano, C; Reyes, S; Rhodes, M; Roe, K; Sawicki, R; Scott, H; Spaeth, M; Tabak, M; Wilks, S

    2010-11-30

    The Laser Inertial Fusion Energy (LIFE) concept is being designed to operate as either a pure fusion or hybrid fusion-fission system. The present work focuses on the pure fusion option. A key component of a LIFE engine is the fusion chamber subsystem. It must absorb the fusion energy, produce fusion fuel to replace that burned in previous targets, and enable both target and laser beam transport to the ignition point. The chamber system also must mitigate target emissions, including ions, x-rays and neutrons and reset itself to enable operation at 10-15 Hz. Finally, the chamber must offer a high level of availability, which implies both a reasonable lifetime and the ability to rapidly replace damaged components. An integrated design that meets all of these requirements is described herein.

  19. Alternate Applications of Fusion - Production of Radioisotopes

    SciTech Connect (OSTI)

    Kulcinski, G.L.; Weidner, J.; Cipiti, B.; Ashley, R.P.; Santarius, J.F.; Murali, S.K.; Piefer, G.; Radel, R. [University of Wisconsin-Madison (United States)

    2003-09-15

    A major effort to find near-term, non-electric applications of fusion energy has shown that the production of radioisotopes is attractive. The use of the D{sup 3}He fusion reaction to produce Positron Emission Tomography (PET) isotopes is described. An Inertial Electrostatic Confinement (IEC) device is particularly well suited to produce low levels of high-energy (14.7 MeV) protons, which in turn, can produce short-lived PET isotopes. The IEC device at University of Wisconsin has been modified to investigate the potential of this process to be commercially attractive.

  20. Fusion at near-barrier energies within quantum diffusion approach

    E-Print Network [OSTI]

    V. V. Sargsyan; G. G. Adamian; N. V. Antonenko; W. Scheid; H. Q. Zhang

    2013-11-20

    The nuclear deformation and neutron-transfer process have been identified as playing a major role in the magnitude of the sub-barrier fusion (capture) cross sections. There are a several experimental evidences which confirm the importance of nuclear deformation on the fusion. The influence of nuclear deformation is straightforward. If the target nucleus is prolate in the ground state, the Coulomb field on its tips is lower than on its sides, that then increases the capture or fusion probability at energies below the barrier corresponding to the spherical nuclei. The role of neutron transfer reactions is less clear. The importance of neutron transfer with positive Q-values on nuclear fusion (capture) originates from the fact that neutrons are insensitive to the Coulomb barrier and therefore they can start being transferred at larger separations before the projectile is captured by target-nucleus. Therefore, it is generally thought that the sub-barrier fusion cross section will increase because of the neutron transfer. The fusion (capture) dynamics induced by loosely bound radioactive ion beams is currently being extensively studied. However, the long-standing question whether fusion (capture) is enhanced or suppressed with these beams has not yet been answered unambiguously. The study of the fusion reactions involving nuclei at the drip-lines has led to contradictory results.

  1. Magneto-Inertial Fusion (Magnetized Target Fusion)( g g )

    E-Print Network [OSTI]

    LA-UR-11-01898 #12;Magneto-inertial fusion: A hybrid approach to fusion....ICF with a twistMagneto-Inertial Fusion (Magnetized Target Fusion)( g g ) or "why should we bother with another ICF boost performance (LLE, Omega) ·Magnetized Target Fusion (MTF) demonstration, FRCHX at AFRL

  2. Reflections on Fusion's History and Implications for Fusion's Future*

    E-Print Network [OSTI]

    Reflections on Fusion's History and Implications for Fusion's Future* Robert Conn Fusion Energy, "Opportunities and Directions in Fusion Energy Science for the Next Decade", held July 11-23, 1999 in Snowmass, Colorado. #12;2 Abstract History shows that all the major opportunities to advance fusion research were

  3. 50 Years of Fusion Research Fusion Innovation Research and Energy

    E-Print Network [OSTI]

    , .... · Controlled Thermonuclear Fusion had great potential ­ Uncontrolled Thermonuclear fusion demonstrated in 19521 50 Years of Fusion Research Dale Meade Fusion Innovation Research and Energy® Princeton, NJ SOFE 2009 June 1, 2009 San Diego, CA 92101 #12;2 #12;2 #12;3 Fusion Prior to Geneva 1958 · A period of rapid

  4. MIT Plasma Science and Fusion Center Fusion Technology & Engineering Division

    E-Print Network [OSTI]

    Fusion Technology & Engineering Division 1. Costing of 4 "Reference" Options 2. Equalization of TF;MIT Plasma Science and Fusion Center Fusion Technology & Engineering Division Total Cost (M$) vs. A; MMIT Plasma Science and Fusion Center Fusion Technology & Engineering Division J.H. Schultz M

  5. FUSION NUCLEAR SCIENCE PROGRAM & SUPPORTING FUSION NUCLEAR SCIENCE FACILITY (FNSF)

    E-Print Network [OSTI]

    FUSION NUCLEAR SCIENCE PROGRAM & SUPPORTING FUSION NUCLEAR SCIENCE FACILITY (FNSF): UPDATE in order to apply the knowledge we gained about burning plasma state #12;FUSION NUCLEAR SCIENCE PROGRAM #12;FUSION NUCLEAR SCIENCE PROGRAM DEVELOPMENT OF ELEMENTS OF THE FUSION NUCLEAR SCIENCE PROGRAM

  6. PHYSICAL REVIEW C 76, 035802 (2007) Implications of low-energy fusion hindrance on stellar burning and nucleosynthesis

    E-Print Network [OSTI]

    2007-01-01

    PHYSICAL REVIEW C 76, 035802 (2007) Implications of low-energy fusion hindrance on stellar burning prediction of strongly reduced low-energy astrophysical S-factors for carbon and oxygen fusion reactions [4] to measurements of the fusion cross section above 2.4 MeV (center-of-mass energy) for the 12 C+12

  7. Historical Perspective on the United States Fusion Program Invited paper presented at American Nuclear Society 16th

    E-Print Network [OSTI]

    Nuclear Society 16th Topical Meeting on the Technology of Fusion Energy 14-16 September, 2004 in Madison controlled thermonuclear reactions, or nuclear fusion as it is now more commonly called, has remained elusiveHistorical Perspective on the United States Fusion Program Invited paper presented at American

  8. Elements of Successful and Safe Fusion Experiment Operations

    SciTech Connect (OSTI)

    K. Rule, L. Cadwallader, Y. Takase, T. Norimatsu, O. Kaneko, M. Sato, and R. Savercool

    2009-02-03

    A group of fusion safety professionals contribute to a Joint Working Group (JWG) that performs occupational safety walkthroughs of US and Japanese fusion experiments on a routine basis to enhance the safety of visiting researchers. The most recent walkthrough was completed in Japan in March 2008 by the US Safety Monitor team. This paper gives the general conclusions on fusion facility personnel safety that can be drawn from the series of walkthroughs.

  9. Coincidence measurements between alpha particles and gamma rays in reactions induced by 85 and 155 MeV ¹²C on ¹??Sm 

    E-Print Network [OSTI]

    Cala, Steven Edward

    1978-01-01

    to fusion. Gamma rays in coincidence with the emitted alpha particles show that a fused system composed of the target plus the massive part of the projectile is produced. 12 In this work, 7. 1 and 12. 9 Nev/nucleon C beams incident on 154 Sm have been... in Reactions Induced by 85 and 155 NeV C on Sm. (August 1978) Steven Edward Cela, B. S. , Purdue University Chairmen of Advisory Committee: Prof. Thomas T. Sugihara A great deal has been learned about the compound nucleus and the fusion process by studying...

  10. Palladium metallurgy and cold fusion; Some remarks

    SciTech Connect (OSTI)

    Murr, L.E. )

    1990-04-01

    In this paper the recent confusion surrounding claims for the observation of cold fusion involving palladium electrodes in electrochemical cells containing deuterium might be clarified to some extent if the palladium metallurgy, particularly in the context of fundamental microstructures, are accurately defined. Both the palladium/hydrogen and palladium/deuterium systems have been extensively investigated, and it is asserted more than two decades ago that the palladium/hydrogen system was perhaps the most extensively, experimentally investigated metal/gas system. Ordinary hydrogen absorbed in palladium fused to form helium, while in the 1940's Wilner actually observed the fusion reaction at the center of the current cold fusion controversy: d + d {yields} {sup 3}He + n (where d = {sup 2}H represents a deuteron, and n is a neutron). In the experiment by Wilner, a deuterium-saturated palladium sheet was bombarded with accelerated deuterons. The product neutrons (n) were slowed by paraffin wax and detected by the activation of silver.

  11. Frontiers of Fusion Materials Science

    E-Print Network [OSTI]

    support for fusion energy within the broad materials science community Topic Fusion benefit Science aspect Office of Fusion Energy Sciences Budget Planning meeting March 13, 2001 Gaithersburg, MD #12;INTRODUCTION of fusion energy and enable improved performance, enhanced safety, and reduced overall fusion system costs

  12. Use of data fusion to optimize contaminant transport predictions

    SciTech Connect (OSTI)

    Eeckhout, E. van

    1997-10-01

    The original data fusion workstation, as envisioned by Coleman Research Corp., was constructed under funding from DOE (EM-50) in the early 1990s. The intent was to demonstrate the viability of fusion and analysis of data from various types of sensors for waste site characterization, but primarily geophysical. This overall concept changed over time and evolved more towards hydrogeological (groundwater) data fusion after some initial geophysical fusion work focused at Coleman. This initial geophysical fusion platform was tested at Hanford and Fernald, and the later hydrogeological fusion work has been demonstrated at Pantex, Savannah River, the US Army Letterkenny Depot, a DoD Massachusetts site and a DoD California site. The hydrogeologic data fusion package has been spun off to a company named Fusion and Control Technology, Inc. This package is called the Hydrological Fusion And Control Tool (Hydro-FACT) and is being sold as a product that links with the software package, MS-VMS (MODFLOW-SURFACT Visual Modeling System), sold by HydroGeoLogic, Inc. MODFLOW is a USGS development, and is in the public domain. Since the government paid for the data fusion development at Coleman, the government and their contractors have access to the data fusion technology in this hydrogeologic package for certain computer platforms, but would probably have to hire FACT (Fusion and Control Technology, Inc.,) and/or HydroGeoLogic for some level of software and services. Further discussion in this report will concentrate on the hydrogeologic fusion module that is being sold as Hydro-FACT, which can be linked with MS-VMS.

  13. Fusion dynamics of symmetric systems near barrier energies

    E-Print Network [OSTI]

    Zhao-Qing Feng; Gen-Ming Jin

    2009-09-06

    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.

  14. Virtual-state internal nuclear fusion in metal lattices

    SciTech Connect (OSTI)

    Bussard, R.W. )

    1989-09-01

    A model of deuterium-deuterium (D-D) fusion in metal lattices is presented based on two phenomena: reactions between virtual-state pairs of deuterons bound by electrons of high effective mass m and deuterium energy upscattering by fast ions from fusion or tritium reactions with virtual-state nuclear structure groups in palladium nuclei. Since m is a decreasing function of deuterium ion bulk density n/sub 0/ the exponential barrier tunneling factor decreases rapidly with m. As a result, the fusion rate reaches a maximum at a loading density above zero but less than saturation. This can explain observations of transient neutron output from the (/sup 3/He,n) branch, of D-D fusion.

  15. Reactions of Methylene Hydrogen

    E-Print Network [OSTI]

    Griffin, E. L.

    1912-05-15

    for Digital Scholarship. http://kuscholarworks.ku.edu Submitted to the School of Engineering of the University of Kansas in partial fulfillment of the requirements for the Degree of Bachelor of Science REACTIONS OP METEELEH1 HYDROGEN With. Special He...KU ScholarWorks | The University of Kansas Pre-1923 Dissertations and Theses Collection Reactions of Methylene Hydrogen 1912 by E. L. Griffin This work was digitized by the Scholarly Communications program staff in the KU Libraries’ Center...

  16. Glossary of fusion energy

    SciTech Connect (OSTI)

    Whitson, M.O.

    1982-01-01

    This glossary gives brief descriptions of approximately 400 terms used by the fusion community. Schematic diagrams and photographs of the major US experiments are also included. (MOW)

  17. Photons & Fusion Newsletter - 2014

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Discovery Science on NIF: Exploring the Physics of Star Formation Article on MOIRE Optics on Cover of Applied Optics Mode 1 Drive Asymmetry in NIF Inertial Confinement Fusion...

  18. Fusion Energy Sciences

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (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...

  19. Photons & Fusion Newsletter

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2 Photons & Fusion Newsletter May 2012 Reducing the Time to Grow Good Cryogenic Layers One of the most demanding aspects of preparing targets for NIF ignition experiments is...

  20. Photons & Fusion Newsletter - 2014

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (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...

  1. Photons & Fusion Newsletter

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    June 2013 Photons & Fusion is a monthly review of science and technology at the National Ignition Facility & Photon Science Directorate. For more information, submit a question....

  2. Magnetic fusion reactor economics

    SciTech Connect (OSTI)

    Krakowski, R.A.

    1995-12-01

    An almost primordial trend in the conversion and use of energy is an increased complexity and cost of conversion systems designed to utilize cheaper and more-abundant fuels; this trend is exemplified by the progression fossil fission {yields} fusion. The present projections of the latter indicate that capital costs of the fusion ``burner`` far exceed any commensurate savings associated with the cheapest and most-abundant of fuels. These projections suggest competitive fusion power only if internal costs associate with the use of fossil or fission fuels emerge to make them either uneconomic, unacceptable, or both with respect to expensive fusion systems. This ``implementation-by-default`` plan for fusion is re-examined by identifying in general terms fusion power-plant embodiments that might compete favorably under conditions where internal costs (both economic and environmental) of fossil and/or fission are not as great as is needed to justify the contemporary vision for fusion power. Competitive fusion power in this context will require a significant broadening of an overly focused program to explore the physics and simbiotic technologies leading to more compact, simplified, and efficient plasma-confinement configurations that reside at the heart of an attractive fusion power plant.

  3. Photons & Fusion Newsletter

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Senior Research Scientist Richard Petrasso's group at the MIT center has been creating detection techniques for inertial confinement fusion (ICF) experiments for more than a...

  4. Inertial Confinement Fusion and the National Ignition Facility (NIF)

    SciTech Connect (OSTI)

    Ross, P.

    2012-08-29

    Inertial confinement fusion (ICF) seeks to provide sustainable fusion energy by compressing frozen deuterium and tritium fuel to extremely high densities. The advantages of fusion vs. fission are discussed, including total energy per reaction and energy per nucleon. The Lawson Criterion, defining the requirements for ignition, is derived and explained. Different confinement methods and their implications are discussed. The feasibility of creating a power plant using ICF is analyzed using realistic and feasible numbers. The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory is shown as a significant step forward toward making a fusion power plant based on ICF. NIF is the world’s largest laser, delivering 1.8 MJ of energy, with a peak power greater than 500 TW. NIF is actively striving toward the goal of fusion energy. Other uses for NIF are discussed.

  5. C+C Fusion Cross Sections Measurements for Nuclear Astrophysics

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Almaraz-Calderon, S.; Carnelli, P. F. F.; Rehm, K. E.; Albers, M.; Alcorta, M.; Bertone, P. F.; Digiovine, B.; Esbensen, H.; Fernandez Niello, J. O.; Henderson, D.; et al

    2015-06-02

    Total fusion cross section of carbon isotopes were obtained using the newly developed MUSIC detector. MUSIC is a highly efficient, active target-detector system designed to measure fusion excitation functions with radioactive beams. The present measurements are relevant for understanding x-ray superbursts. The results of the first MUSIC campaign as well as the astrophysical implications are presented in this work.

  6. Thermonuclear Fusion Energy : Assessment and Next Step Ren Pellat

    E-Print Network [OSTI]

    Thermonuclear Fusion Energy : Assessment and Next Step René Pellat High Commissioner at the French 2000, Rome Abstract Fifty years of thermonuclear fusion work with no insurmountable road blocks have is well advanced through the International Thermonuclear Experimental Reactor (ITER) programme, which has

  7. Wayne Meier for Edmund Synakowski Fusion Power Associates

    E-Print Network [OSTI]

    as a fusion energy alternative · Community connections yield vitality ­ collaboration, cross, CA December 3-4, 2008 New Directions in the Fusion Energy Program at LLNL This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Security, LLC

  8. Review of the Inertial Fusion Energy Program

    SciTech Connect (OSTI)

    none,

    2004-03-29

    Igniting fusion fuel in the laboratory remains an alluring goal for two reasons: the desire to study matter under the extreme conditions needed for fusion burn, and the potential of harnessing the energy released as an attractive energy source for mankind. The inertial confinement approach to fusion involves rapidly compressing a tiny spherical capsule of fuel, initially a few millimeters in radius, to densities and temperatures higher than those in the core of the sun. The ignited plasma is confined solely by its own inertia long enough for a significant fraction of the fuel to burn before the plasma expands, cools down and the fusion reactions are quenched. The potential of this confinement approach as an attractive energy source is being studied in the Inertial Fusion Energy (IFE) program, which is the subject of this report. A complex set of interrelated requirements for IFE has motivated the study of novel potential solutions. Three types of “drivers” for fuel compression are presently studied: high-averagepower lasers (HAPL), heavy-ion (HI) accelerators, and Z-Pinches. The three main approaches to IFE are based on these drivers, along with the specific type of target (which contains the fuel capsule) and chamber that appear most promising for a particular driver.

  9. Liquid Vortex Shielding for Fusion Energy Applications

    SciTech Connect (OSTI)

    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)

    2005-05-15

    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.

  10. Polynomial fusion rings of W-extended logarithmic minimal models

    E-Print Network [OSTI]

    Jorgen Rasmussen

    2008-12-05

    The countably infinite number of Virasoro representations of the logarithmic minimal model LM(p,p') can be reorganized into a finite number of W-representations with respect to the extended Virasoro algebra symmetry W. Using a lattice implementation of fusion, we recently determined the fusion algebra of these representations and found that it closes, albeit without an identity for p>1. Here, we provide a fusion-matrix realization of this fusion algebra and identify a fusion ring isomorphic to it. We also consider various extensions of it and quotients thereof, and introduce and analyze commutative diagrams with morphisms between the involved fusion algebras and the corresponding quotient polynomial fusion rings. One particular extension is reminiscent of the fundamental fusion algebra of LM(p,p') and offers a natural way of introducing the missing identity for p>1. Working out explicit fusion matrices is facilitated by a further enlargement based on a pair of mutual Moore-Penrose inverses intertwining between the W-fundamental and enlarged fusion algebras.

  11. Suppressed fusion cross section for neutron halo nuclei

    E-Print Network [OSTI]

    Makoto Ito; Kazuhiro Yabana; Takashi Nakatsukasa; Manabu Ueda

    2006-01-20

    Fusion reactions of neutron-halo nuclei are investigated theoretically with a three-body model. The time-dependent wave-packet method is used to solve the three-body Schrodinger equation. The halo neutron behaves as a spectator during the Coulomb dissociation process of the projectile. The fusion cross sections of 11Be-209Bi and 6He-238U are calculated and are compared with measurements. Our calculation indicates that the fusion cross section is slightly hindered by the presence of weakly bound neutrons.

  12. Alignmentkorrekturen und Fusion von Dokumentaufnahmen

    E-Print Network [OSTI]

    Block, Marco

    Alignmentkorrekturen und Fusion von Dokumentaufnahmen Am Fachbereich Mathematik und Informatik . . . . . . . . . . . . . . . . . . . . . . . . 18 Exposure Blending . . . . . . . . . . . . . . . . . . . . . . 19 Exposure Fusion . . . . . . . . . . . . . . . . . . . . . . 23 Varianz . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Energy of Image Gradient

  13. MAP-Inference on Large Scale Higher-Order Discrete Graphical Models by Fusion Moves

    E-Print Network [OSTI]

    Schnörr, Christoph

    MAP-Inference on Large Scale Higher-Order Discrete Graphical Models by Fusion Moves J¨org Hendrik reconsider the work of Lempitsky et al. 2010 on fusion moves and apply it to general discrete graphical models. We propose two alternatives for calculating fusion moves that outperform the standard in several

  14. FUSION METHODS BASED ON COMMON ORDER INVARIABILITY FOR META SEARCH ENGINE SYSTEMS

    E-Print Network [OSTI]

    Zhang, Minjie

    FUSION METHODS BASED ON COMMON ORDER INVARIABILITY FOR META SEARCH ENGINE SYSTEMS Xiaohua Yang Hui@ctit.zhnut.edu.cn hy92,minjie@uow.edu.au Abstract: Fusion is an important work for running meta search engine systems. A fusion algorithm is rational iff it can satisfy three conditions, i.e. the associativity, commutativity

  15. FUSION OF DIGITAL ELEVATION MODELS USING SPARSE REPRESENTATIONS H. Papasaika1

    E-Print Network [OSTI]

    Schindler, Konrad

    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

  16. Annual Report of the EURATOM/CCFE Fusion Programme 2011/12 9.1 OVERVIEW

    E-Print Network [OSTI]

    : · To increase the number of UK companies bidding for fusion contracts, especially from the ITER programme 180M of work for UK companies. Our list of companies who are receiving fusion news and tender alerts as `Fusion for Energy' (F4E) in Barcelona, and (b) the central ITER International Organisation (ITER IO

  17. 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

  18. Electron screening effect on stellar thermonuclear fusion

    E-Print Network [OSTI]

    Potekhin, A Y

    2013-01-01

    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 (Yukawa-potential and "quantum-tail") theoretical results on stellar thermonuclear fusions and show that these scenarios do not apply to stellar conditions.

  19. Fusion Power Deployment

    SciTech Connect (OSTI)

    J.A. Schmidt; J.M. Ogden

    2002-02-06

    Fusion power plants could be part of a future portfolio of non-carbon dioxide producing energy supplies such as wind, solar, biomass, advanced fission power, and fossil energy with carbon dioxide sequestration. In this paper, we discuss key issues that could impact fusion energy deployment during the last half of this century. These include geographic issues such as resource availability, scale issues, energy storage requirements, and waste issues. The resource needs and waste production associated with fusion deployment in the U.S. should not pose serious problems. One important feature of fusion power is the fact that a fusion power plant should be locatable within most local or regional electrical distribution systems. For this reason, fusion power plants should not increase the burden of long distance power transmission to our distribution system. In contrast to fusion power, regional factors could play an important role in the deployment of renewable resources such as wind, solar and biomass or fossil energy with CO2 sequestration. We examine the role of these regional factors and their implications for fusion power deployment.

  20. Thermal Resonance Fusion

    E-Print Network [OSTI]

    Dong, Bao-Guo

    2015-01-01

    We first show a possible mechanism to create a new type of nuclear fusion, thermal resonance fusion, i.e. low energy nuclear fusion with thermal resonance of light nuclei or atoms, such as deuterium or tritium. The fusion of two light nuclei has to overcome the Coulomb barrier between these two nuclei to reach up to the interacting region of nuclear force. We found nuclear fusion could be realized with thermal vibrations of crystal lattice atoms coupling with light atoms at low energy by resonance to overcome this Coulomb barrier. Thermal resonances combining with tunnel effects can greatly enhance the probability of the deuterium fusion to the detectable level. Our low energy nuclear fusion mechanism research - thermal resonance fusion mechanism results demonstrate how these light nuclei or atoms, such as deuterium, can be fused in the crystal of metal, such as Ni or alloy, with synthetic thermal vibrations and resonances at different modes and energies experimentally. The probability of tunnel effect at dif...

  1. Thermal Resonance Fusion

    E-Print Network [OSTI]

    Bao-Guo Dong

    2015-07-07

    We first show a possible mechanism to create a new type of nuclear fusion, thermal resonance fusion, i.e. low energy nuclear fusion with thermal resonance of light nuclei or atoms, such as deuterium or tritium. The fusion of two light nuclei has to overcome the Coulomb barrier between these two nuclei to reach up to the interacting region of nuclear force. We found nuclear fusion could be realized with thermal vibrations of crystal lattice atoms coupling with light atoms at low energy by resonance to overcome this Coulomb barrier. Thermal resonances combining with tunnel effects can greatly enhance the probability of the deuterium fusion to the detectable level. Our low energy nuclear fusion mechanism research - thermal resonance fusion mechanism results demonstrate how these light nuclei or atoms, such as deuterium, can be fused in the crystal of metal, such as Ni or alloy, with synthetic thermal vibrations and resonances at different modes and energies experimentally. The probability of tunnel effect at different resonance energy given by the WKB method is shown that indicates the thermal resonance fusion mode, especially combined with the tunnel effect, is possible and feasible. But the penetrating probability decreases very sharply when the input resonance energy decreases less than 3 keV, so for thermal resonance fusion, the key point is to increase the resonance peak or make the resonance sharp enough to the acceptable energy level by the suitable compound catalysts, and it is better to reach up more than 3 keV to make the penetrating probability larger than 10^{-10}.

  2. Up-Fusion: An Evolving Multimedia Decision Fusion Xiangyu Wang

    E-Print Network [OSTI]

    Rui, Yong

    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

  3. Study of fusion dynamics using Skyrme energy density formalism with different surface corrections

    E-Print Network [OSTI]

    Ishwar Dutt; Narinder K. Dhiman

    2010-11-19

    Within the framework of Skyrme energy density formalism, we investigate the role of surface corrections on the fusion of colliding nuclei. For this, the coefficient of surface correction was varied between 1/36 and 4/36, and its impact was studied on about 180 reactions. Our detailed investigations indicate a linear relationship between the fusion barrier heights and strength of the surface corrections. Our analysis of the fusion barriers advocate the strength of surface correction of 1/36.

  4. Fusion cycles in stars and stellar neutrinos

    E-Print Network [OSTI]

    G. Wolschin

    2002-10-01

    Starting from the early works by Weizsaecker and Bethe about fusion cycles and energy conversion in stars, a brief survey of thermonuclear processes in stars leading to contemporary research problems in this field is given. Special emphasis is put on the physics of stellar and, in particular, solar neutrinos which is at the frontline of current investigations.

  5. Fusion cycles in stars and stellar neutrinos

    E-Print Network [OSTI]

    Wolschin, G

    2003-01-01

    Starting from the early works by Weizsaecker and Bethe about fusion cycles and energy conversion in stars, a brief survey of thermonuclear processes in stars leading to contemporary research problems in this field is given. Special emphasis is put on the physics of stellar and, in particular, solar neutrinos which is at the frontline of current investigations.

  6. Fusion Power Associates Meeting 1 December 2010

    E-Print Network [OSTI]

    growth of hydro-instability Higher energy gain Use of less laser energy implosion #12;KrF Light helps Research and the U.S. Department of Energy, NNSA. #12;Opening remarks on path towards Inertial Fusion Energy (IFE) · Community needs to work together to provide the technical case for funding an IFE program

  7. Image Fusion for MR Bias Correction

    E-Print Network [OSTI]

    Willsky, Alan S.

    . For example, for fast-spin echo (FSE) pulse sequences, the MR signal is given by this equation: · Target T1Image Fusion for MR Bias Correction Ayres Fan Stochastic Systems Group Joint work with W. Wells, J strength · Spatially varying field strength encodes spatial location in the frequency domain #12;MR Imaging

  8. Portuguese research program on nuclear fusion

    SciTech Connect (OSTI)

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

    1994-12-01

    The Portuguese research program on nuclear fusion is presented. The experimental activity associated with the tokamak ISTTOK as well as the work carried out in the frame of international collaboration are summarized. The main technological features of ISTTOK are described along with studies on microwave reflectometry. Future plans are briefly described.

  9. Multishell inertial confinement fusion target

    DOE Patents [OSTI]

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

    1984-01-01

    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.

  10. Multishell inertial confinement fusion target

    DOE Patents [OSTI]

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

    1987-01-01

    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.

  11. 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

  12. Fusing exotic nuclei below the barrier This work was supported by the U.S.

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    : At the temperature of the crust, the Coulomb barrier is too high for thermonuclear fusion of carbon ­ another heat;Motivation Fusion reactions in the outer crust result in X-ray bursts and superbursts Problem) Polarization of nuclei fusion enhancement ? Y. Eyal et al., PRC 13, 1527 (1976) Astrophysically relevant

  13. Requirements for low cost electricity and hydrogen fuel production from multi-unit intertial fusion energy plants with a shared driver and target factory

    E-Print Network [OSTI]

    Logan, B. Grant; Moir, Ralph; Hoffman, Myron A.

    1994-01-01

    California 9~516 This work explores the economy of scale for multi- unit inertial fusion energy power plants

  14. Decision Level Data Fusion for Routing of Documents in the TREC3 Context: A Best Case Analysis of Worst Case Results.

    E-Print Network [OSTI]

    algorithmic" process, carried out by one person, working without aid of thesaurus. The details of the fusion

  15. May. 20, 2003. 01:00 AM Ottawa cool to fusion project cost

    E-Print Network [OSTI]

    for Canada to become home to the world's first operational nuclear fusion reactor, a $12 billion facility to reverse a 1999 decision to scrap all federal research support for fusion energy, the same atomic reaction on nuclear fission, the splitting of atoms of uranium. Murray Stewart, head of the industry-led consortium

  16. Proton core imaging of the nuclear burn in inertial confinement fusion implosions

    E-Print Network [OSTI]

    Proton core imaging of the nuclear burn in inertial confinement fusion implosions J. L. De; published online 7 April 2006 A proton emission imaging system has been developed and used extensively the penetrating 14.7 MeV protons produced from D 3 He fusion reactions to produce emission images of the nuclear

  17. Near-and sub-barrier fusion of 20O incident ions

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    University April 2012 #12;Outline · Background · Neutron Star Crust · Fusion and Reference ReactionsNear- and sub-barrier fusion of 20O incident ions with 12C target nuclei Kyle Brown G410 Indiana observed from accreting neutron stars · Models cannot reproduce conditions needed for superbursts · 24O

  18. Spherical torus fusion reactor

    DOE Patents [OSTI]

    Martin Peng, Y.K.M.

    1985-10-03

    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.

  19. Nuclear Reactions

    E-Print Network [OSTI]

    C. A. Bertulani

    2010-07-14

    Nuclear reactions generate energy in nuclear reactors, in stars, and are responsible for the existence of all elements heavier than hydrogen in the universe. Nuclear reactions denote reactions between nuclei, and between nuclei and other fundamental particles, such as electrons and photons. A short description of the conservation laws and the definition of basic physical quantities is presented, followed by a more detailed account of specific cases: (a) formation and decay of compound nuclei; (b)direct reactions; (c) photon and electron scattering; (d) heavy ion collisions; (e) formation of a quark-gluon plasma; (f) thermonuclear reactions; (g) and reactions with radioactive beams. Whenever necessary, basic equations are introduced to help understand general properties of these reactions. Published in Wiley Encyclopedia of Physics, ISBN-13: 978-3-527-40691-3 - Wiley-VCH, Berlin, 2009.

  20. Comments on the model for coherent deuteron-deuteron fusion in crystalline Pd-D lattice

    SciTech Connect (OSTI)

    Vaidya, S.N. )

    1993-08-01

    The enhancement of the deuteron-deuteron fusion rate is estimated for a coherent interaction mechanism under realistic experimental conditions. The extension of this mechanism to (n,[gamma]) reactions is outlined. 19 refs., 2 figs.

  1. FUSION POWER ASSOCIATES Annual Meeting and Symposium

    E-Print Network [OSTI]

    Agenda FUSION POWER ASSOCIATES 35TH Annual Meeting and Symposium Fusion Energy: Recent Progress Fusion and the Road Ahead 12:50 The Magnetic Fusion Program in Korea ­ G.S. Lee, Korea 1:10 The Magnetic Fusion Program in China ­ Yuanxi Wan, China 1:30 The Magnetic Fusion Program in Europe ­ Tony Donne, EuroFusion

  2. Gas Transport and Control in Thick-Liquid Inertial Fusion Power Plants

    E-Print Network [OSTI]

    Debonnel, Christophe Sylvain

    2006-01-01

    Fusion Energy . . . . . . . . . . . . . . . . . . . . . . . . .Fusion Energy . . . . . . . . . . . . . . . . . . . . .vortex shielding for fusion energy applications. Fusion

  3. Fusion Chamber Technology Publications

    E-Print Network [OSTI]

    California at Los Angeles, University of

    .A. "Modeling and Analysis of Time-Dependant Tritium Transport in Lithium Oxide", Journal of Nuclear Materials. 981-985, March (2001).. 16. E.T. Cheng, "Study of a Lead-Bismuth Cooled Fusion Blanket for Burning

  4. Fusion-breeder program

    SciTech Connect (OSTI)

    Moir, R.W.

    1982-11-19

    The various approaches to a combined fusion-fission reactor for the purpose of breeding /sup 239/Pu and /sup 233/U are described. Design aspects and cost estimates for fuel production and electricity generation are discussed. (MOW)

  5. Fusion ignition research experiment

    SciTech Connect (OSTI)

    Dale Meade

    2000-07-18

    Understanding the properties of high gain (alpha-dominated) fusion plasmas in an advanced toroidal configuration is the largest remaining open issue that must be addressed to provide the scientific foundation for an attractive magnetic fusion reactor. The critical parts of this science can be obtained in a compact high field tokamak which is also likely to provide the fastest and least expensive path to understanding alpha-dominated plasmas in advanced toroidal systems.

  6. Still Flying Fusion Edition 

    E-Print Network [OSTI]

    2013-11-27

    . ; 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...

  7. Integrated Chamber Design for the Laser Inertial Fusion Energy (LIFE) Engine

    SciTech Connect (OSTI)

    Latkowski, J F; Kramer, K J; Abbott, R P; Morris, K R; DeMuth, J; Divol, L; El-Dasher, B; Lafuente, A; Loosmore, G; Reyes, S; Moses, G A; Fratoni, M; Flowers, D; Aceves, S; Rhodes, M; Kane, J; Scott, H; Kramer, R; Pantano, C; Scullard, C; Sawicki, R; Wilks, S; Mehl, M

    2010-12-07

    The Laser Inertial Fusion Energy (LIFE) concept is being designed to operate as either a pure fusion or hybrid fusion-fission system. A key component of a LIFE engine is the fusion chamber subsystem. The present work details the chamber design for the pure fusion option. The fusion chamber consists of the first wall and blanket. This integrated system must absorb the fusion energy, produce fusion fuel to replace that burned in previous targets, and enable both target and laser beam transport to the ignition point. The chamber system also must mitigate target emissions, including ions, x-rays and neutrons and reset itself to enable operation at 10-15 Hz. Finally, the chamber must offer a high level of availability, which implies both a reasonable lifetime and the ability to rapidly replace damaged components. An integrated LIFE design that meets all of these requirements is described herein.

  8. On the Structure of the Fusion Ideal

    E-Print Network [OSTI]

    Douglas, Christopher L.

    2009-01-01

    On the Structure of the Fusion Ideal 4. Bouwknegt, P. ,of Wess-Zumino-Witten fusion rings. Rev. Math. Phys.A conjectural presentation of fusion algebras. Preprint,

  9. LBNL perspective on inertial fusion energy

    E-Print Network [OSTI]

    Bangerter, Roger O.

    1995-01-01

    LBNL Perspective on Inertial Fusion Energy Roger Bangerter1990) and the last Fusion Energy Advisory Committee (1993)year 2005, the Inertial Fusion Energy Program must grow to

  10. CONTROL OF MECHANICALLY ACTIVATED POLYMERSOME FUSION: FACTORS...

    Office of Scientific and Technical Information (OSTI)

    CONTROL OF MECHANICALLY ACTIVATED POLYMERSOME FUSION: FACTORS AFFECTING FUSION. Citation Details In-Document Search Title: CONTROL OF MECHANICALLY ACTIVATED POLYMERSOME FUSION:...

  11. ITER Fusion Energy

    ScienceCinema (OSTI)

    Dr. Norbert Holtkamp

    2010-01-08

    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.

  12. COLLOQUIUM: Spitzer's 100th: Founding PPPL & Pioneering Work...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Colloquia MBG Auditorium COLLOQUIUM: Spitzer's 100th: Founding PPPL & Pioneering Work in Fusion Energy Dr. Greg Hammett Princeton University Professor Russell Kulsrud Princeton...

  13. How much laser power can propagate through fusion plasma?

    E-Print Network [OSTI]

    Pavel M. Lushnikov; Harvey A. Rose

    2006-03-28

    Propagation of intense laser beams is crucial for inertial confinement fusion, which requires precise beam control to achieve the compression and heating necessary to ignite the fusion reaction. The National Ignition Facility (NIF), where fusion will be attempted, is now under construction. Control of intense beam propagation may be ruined by laser beam self-focusing. We have identified the maximum laser beam power that can propagate through fusion plasma without significant self-focusing and have found excellent agreement with recent experimental data, and suggest a way to increase that maximum by appropriate choice of plasma composition with implication for NIF designs. Our theory also leads to the prediction of anti-correlation between beam spray and backscatter and suggests the indirect control of backscatter through manipulation of plasma ionization state or acoustic damping.

  14. Fusion neutron yield from high intensity laser-cluster interaction

    SciTech Connect (OSTI)

    Davis, J.; Petrov, G.M.; Velikovich, A.L. [Naval Research Laboratory, Plasma Physics Division, 4555 Overlook Avenue SW, Washington, DC 20375 (United States)

    2006-06-15

    The fusion neutron yield from a compact neutron source is studied. Laser-irradiated deuterium clusters serve as a precursor of high-energy deuterium ions, which react with the walls of a fusion reaction chamber and produce copious amounts of neutrons in fusion reactions. The explosion of deuterium clusters with initial radius of 50-200 A irradiated by a subpicosecond laser with intensity of 10{sup 16} W/cm{sup 2} is examined theoretically. We studied the conversion efficiency of laser energy to ion kinetic energy, the mean and maximum ion kinetic energy, and ion energy distribution function by a molecular dynamics model. A yield of {approx}10{sup 5}-10{sup 6} neutrons/J is obtainable for a peak laser intensity of 10{sup 16}-10{sup 17} W/cm{sup 2} and clusters with an initial radius of 200-400 A.

  15. Workshop on Accelerators for Heavy Ion Fusion: Summary Report of the Workshop

    SciTech Connect (OSTI)

    Seidl, P.A.; Barnard, J.J.

    2011-04-29

    The Workshop on Accelerators for Heavy Ion Fusion was held at Lawrence Berkeley National Laboratory May 23-26, 2011. The workshop began with plenary sessions to review the state of the art in HIF (heavy ion fusion), followed by parallel working groups, and concluded with a plenary session to review the results. There were five working groups: IFE (inertial fusion energy) targets, RF approach to HIF, induction accelerator approach to HIF, chamber and driver interface, ion sources and injectors.

  16. asahi.com>ENGLISH> Opinion,Editorial Fusion reactor bid

    E-Print Network [OSTI]

    emulate the #12;sun's hydrogen reactions. Radioactive waste produced by fusion would be negligible, with the government envisioning construction of a test reactor here as a means to lead development. But the EU is also the entire EU. The price tag for ITER construction is estimated at 570 billion yen, which when included

  17. Alpha-nucleus potential for alpha-decay and sub-barrier fusion

    E-Print Network [OSTI]

    V. Yu. Denisov; H. Ikezoe

    2005-10-27

    The set of parameters for alpha-nucleus potential is derived by using the data for both the alpha-decay half-lives and the fusion cross-sections around the barrier for reactions alpha+40Ca, alpha+59Co, alpha+208Pb. The alpha-decay half-lives are obtained in the framework of a cluster model using the WKB approximation. The evaluated alpha-decay half-lives and the fusion cross-sections agreed well with the data. Fusion reactions between alpha-particle and heavy nuclei can be used for both the formation of very heavy nuclei and spectroscopic studies of the formed compound nuclei.

  18. Science/Fusion Energy Sciences FY 2012 Congressional Budget Fusion Energy Sciences

    E-Print Network [OSTI]

    , and creating theoretical and computational models to resolve the essential physics principles. Background and electrons that can conduct electrical currents and can respond to electric and magnetic fields. The science experiments have generated millions of watts of fusion power for seconds at a time. In the vision of a working

  19. 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 to fusion energy. With this objective EFDA has elaborated the present roadmap. ITER is the key facility in the roadmap: ITER construction is fostering industrial innovation on a number of enabling technologies. Its

  20. 50 Years of Fusion Research Fusion Innovation Research and Energy

    E-Print Network [OSTI]

    of experiments were tried and ended up far from fusion conditions ­ Magnetic Fusion research in the U radioactive waste - tritium breeding (TBR > 1) to complete the fuel cycle · Fusion Power Densities ( ~ 5 MWm-3 diffusion." · Model C was built to reduce complications of impurities (divertor) and wall neutrals ( a = 5

  1. Pathways to Laser Fusion Beyond NIF Fusion Power Associates Meeting

    E-Print Network [OSTI]

    Pathways to Laser Fusion Beyond NIF Fusion Power Associates Meeting Washington DC 10 December 2013 and hydrodynamic efficiency · Reduces risk from hydro and all laser plasma instabilities Multi-stage focal zooming · Demonstrate integrated physics / technologies for a power plant. · Tritium breeding, fusion power handling

  2. Road to Inertial Fusion Energy Fusion Power Associates Meeting

    E-Print Network [OSTI]

    . Crack is clear through 5 mm thick deck plate #12;Coal-fired and KrF laser fusion power power plants have-electron-beams-nrl-to-clean-up- nox-emissions-from-coal-power-plant NRL has a Cooperative Research and Development AgreementRoad to Inertial Fusion Energy Fusion Power Associates Meeting Washington DC 16 December 2014

  3. 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

  4. Energy chief tells Jersey: Fusion's back Secretary, at top research lab in Plainsboro, says country resuming international effort

    E-Print Network [OSTI]

    . It should put scientists one step away from a demonstration fusion power plant, which physicists believe the successor to ITER, a working fusion power plant that would be the first to contribute electricity to a power and other lab workers. Fusion power produces no greenhouse gas emissions and only low levels of radioactive

  5. Spherical torus fusion reactor

    DOE Patents [OSTI]

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

    1989-01-01

    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.

  6. Nuclear Fusion: ITER Project Update

    E-Print Network [OSTI]

    Magnetic Fusion Research is a World-wide Endeavor... #12;U.S. ITER / Sauthoff Slide 3 Roadmap · Overview Slide 13 Roadmap · Overview of fusion and magnetic confinement systems · Demonstrating the scientific

  7. Multisensor data fusion algorithm development

    SciTech Connect (OSTI)

    Yocky, D.A.; Chadwick, M.D.; Goudy, S.P.; Johnson, D.K.

    1995-12-01

    This report presents a two-year LDRD research effort into multisensor data fusion. We approached the problem by addressing the available types of data, preprocessing that data, and developing fusion algorithms using that data. The report reflects these three distinct areas. First, the possible data sets for fusion are identified. Second, automated registration techniques for imagery data are analyzed. Third, two fusion techniques are presented. The first fusion algorithm is based on the two-dimensional discrete wavelet transform. Using test images, the wavelet algorithm is compared against intensity modulation and intensity-hue-saturation image fusion algorithms that are available in commercial software. The wavelet approach outperforms the other two fusion techniques by preserving spectral/spatial information more precisely. The wavelet fusion algorithm was also applied to Landsat Thematic Mapper and SPOT panchromatic imagery data. The second algorithm is based on a linear-regression technique. We analyzed the technique using the same Landsat and SPOT data.

  8. Fusion technology status and requirements

    SciTech Connect (OSTI)

    Thomassen, K.I.

    1982-01-26

    This paper summarizes the status of fusion technology and discusses the requirements to be met in order to build a demonstration fusion plant. Strategies and programmatic considerations in pursuing engineering feasibility are also outlined.

  9. Update and Outlook for theUpdate and Outlook for the Fusion Energy SciencesFusion Energy SciencesFusion Energy SciencesFusion Energy Sciences

    E-Print Network [OSTI]

    Update and Outlook for theUpdate and Outlook for the Fusion Energy SciencesFusion Energy SciencesFusion Energy SciencesFusion Energy Sciences E J SynakowskiE.J. Synakowski Associate Director, Office of Science F i E S iFusion Energy Sciences For the University Fusion Associates Town Hall Meeting APS DPP P id

  10. Fusion Energy Division annual progress report, period ending December 31, 1989

    SciTech Connect (OSTI)

    Sheffield, J.; Baker, C.C.; Saltmarsh, M.J.

    1991-07-01

    The Fusion Program of Oak Ridge National Laboratory (ORNL) carries out research in most areas of magnetic confinement fusion. The program is directed toward the development of fusion as an energy source and is a strong and vital component of both the US fusion program and the international fusion community. Issued as the annual progress report of the ORNL Fusion Energy Division, this report also contains information from components of the Fusion Program that are carried out by other ORNL organizations (about 15% of the program effort). The areas addressed by the Fusion Program and discussed in this report include the following: Experimental and theoretical research on magnetic confinement concepts, engineering and physics of existing and planned devices, including remote handling, development and testing of diagnostic tools and techniques in support of experiments, assembly and distribution to the fusion community of databases on atomic physics and radiation effects, development and testing of technologies for heating and fueling fusion plasmas, development and testing of superconducting magnets for containing fusion plasmas, development and testing of materials for fusion devices, and exploration of opportunities to apply the unique skills, technology, and techniques developed in the course of this work to other areas. Highlights from program activities are included in this report.

  11. Fusion Energy Division progress report, 1 January 1990--31 December 1991

    SciTech Connect (OSTI)

    Sheffield, J.; Baker, C.C.; Saltmarsh, M.J.

    1994-03-01

    The Fusion Program of the Oak Ridge National Laboratory (ORNL), a major part of the national fusion program, encompasses nearly all areas of magnetic fusion research. The program is directed toward the development of fusion as an economical and environmentally attractive energy source for the future. The program involves staff from ORNL, Martin Marietta Energy systems, Inc., private industry, the academic community, and other fusion laboratories, in the US and abroad. Achievements resulting from this collaboration are documented in this report, which is issued as the progress report of the ORNL Fusion Energy Division; it also contains information from components for the Fusion Program that are external to the division (about 15% of the program effort). The areas addressed by the Fusion Program include the following: experimental and theoretical research on magnetic confinement concepts; engineering and physics of existing and planned devices, including remote handling; development and testing of diagnostic tools and techniques in support of experiments; assembly and distribution to the fusion community of databases on atomic physics and radiation effects; development and testing of technologies for heating and fueling fusion plasmas; development and testing of superconducting magnets for containing fusion plasmas; development and testing of materials for fusion devices; and exploration of opportunities to apply the unique skills, technology, and techniques developed in the course of this work to other areas (about 15% of the Division`s activities). Highlights from program activities during 1990 and 1991 are presented.

  12. Fusion welding process

    DOE Patents [OSTI]

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

    1983-01-01

    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.

  13. This work was supported by the U.S. DOE Office of Science under Grant No. DEFG02-88ER-40404 Romualdo deSouza, TAMU-Commerce, Feb. 5, 2015

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    Neutron stars represent an extreme point on this diagram #12;Fusion reactions in the outer crust star crust #12;Fusion of Neutron-rich Light Nuclei One potential heat source, proposed (Horowitz et al.) to heat the crust of neutron stars and allow 12C fusion, is the fusion of neutron- rich light nuclei (ex

  14. RESEARCH HIGHLIGHTS State of fusion

    E-Print Network [OSTI]

    Loss, Daniel

    to provide an effectively limitless source of safe,clean energy seemed just around the corner.Fifty years on for continued optimism. Nuclear fusion power relies on the energy released when two light atomic nuclei fuseRESEARCH HIGHLIGHTS State of fusion In the 1950s,the promise of controlled nuclear fusion

  15. The Fusion Machine (extended abstract)

    E-Print Network [OSTI]

    Gardner, Philippa

    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

  16. Modular Stellarator Fusion Reactor concept

    SciTech Connect (OSTI)

    Miller, R.L.; Krakowski, R.A.

    1981-08-01

    A preliminary conceptual study is made of the Modular Stellarator Reactor (MSR). A steady-state ignited, DT-fueled, magnetic fusion reactor is proposed for use as a central electric-power station. The MSR concept combines the physics of the classic stellarator confinement topology with an innovative, modular-coil design. Parametric tradeoff calculations are described, leading to the selection of an interim design point for a 4-GWt plant based on Alcator transport scaling and an average beta value of 0.04 in an l = 2 system with a plasma aspect ratio of 11. The physics basis of the design point is described together with supporting magnetics, coil-force, and stress computations. The approach and results presented herein will be modified in the course of ongoing work to form a firmer basis for a detailed conceptual design of the MSR.

  17. Inertial Fusion Power Plant Concept of Operations and Maintenance

    SciTech Connect (OSTI)

    Anklam, T.; Knutson, B.; Dunne, A. M.; Kasper, J.; Sheehan, T.; Lang, D.; Roberts, V.; Mau, D.

    2015-01-15

    Parsons and LLNL scientists and engineers performed design and engineering work for power plant pre-conceptual designs based on the anticipated laser fusion demonstrations at the National Ignition Facility (NIF). Work included identifying concepts of operations and maintenance (O&M) and associated requirements relevant to fusion power plant systems analysis. A laser fusion power plant would incorporate a large process and power conversion facility with a laser system and fusion engine serving as the heat source, based in part on some of the systems and technologies advanced at NIF. Process operations would be similar in scope to those used in chemical, oil refinery, and nuclear waste processing facilities, while power conversion operations would be similar to those used in commercial thermal power plants. While some aspects of the tritium fuel cycle can be based on existing technologies, many aspects of a laser fusion power plant presents several important and unique O&M requirements that demand new solutions. For example, onsite recovery of tritium; unique remote material handling systems for use in areas with high radiation, radioactive materials, or high temperatures; a five-year fusion engine target chamber replacement cycle with other annual and multi-year cycles anticipated for major maintenance of other systems, structures, and components (SSC); and unique SSC for fusion target waste recycling streams. This paper describes fusion power plant O&M concepts and requirements, how O&M requirements could be met in design, and how basic organizational and planning issues can be addressed for a safe, reliable, economic, and feasible fusion power plant.

  18. Fusion Probability in Dinuclear System

    E-Print Network [OSTI]

    Juhee Hong

    2015-03-26

    Fusion can be described by the time evolution of a dinuclear system with two degrees of freedom, the relative motion and transfer of nucleons. In the presence of the coupling between two collective modes, we solve the Fokker-Planck equation in a locally harmonic approximation. The potential of a dinuclear system has the quasifission barrier and the inner fusion barrier, and the escape rates can be calculated by the Kramers' model. To estimate the fusion probability, we calculate the quasifission rate and the fusion rate. We investigate the coupling effects on the fusion probability and the cross section of evaporation residue.

  19. Status of inertial confinement fusion

    SciTech Connect (OSTI)

    Schriever, R.L. (Dept. of Energy, Washington, DC (USA))

    1987-12-01

    Technical, institutional, and financial assessments are made of inertial confinement fusion programs in the United States. Among the programs discussed are the Particle Beam Fusion Accelerator at Sandia, the AURORA facility at Los Alamos, the Heavy Ion Fusion Accelerator at Lawrence Berkeley Laboratory, the OMEGA glass laser system and facility, and the fusion research program at the University of Rochester. Target, diagnostic, heating, and other areas of research are discussed. Prospects for the future of fusion research within the context of the current energy scenario in the country are evaluated.

  20. Stau-catalyzed Nuclear Fusion

    E-Print Network [OSTI]

    K. Hamaguchi; T. Hatsuda; T. T. Yanagida

    2006-10-06

    We point out that the stau may play a role of a catalyst for nuclear fusions if the stau is a long-lived particle as in the scenario of gravitino dark matter. In this letter, we consider d d fusion under the influence of stau where the fusion is enhanced because of a short distance between the two deuterons. We find that one chain of the d d fusion may release an energy of O(10) GeV per stau. We discuss problems of making the stau-catalyzed nuclear fusion of practical use with the present technology of producing stau.

  1. Summary Report of the Energy Issues Working Group

    E-Print Network [OSTI]

    Information Agency Annual Energy Outlook 1999. #12;Fusion Power Plant Attractiveness, Technical RiskSummary Report of the Energy Issues Working Group Organizer: Farrokh Najmabadi Covenors: Jeffrey Sauthoff 1999 Fusion Summer Study July 12-23, 1999, Snowmass, CO Energy Working Group Web Site: http

  2. Response of nickel surface to pulsed fusion plasma radiations

    SciTech Connect (OSTI)

    Niranjan, Ram Rout, R. K. Srivastava, R. Gupta, Satish C.; Chakravarthy, Y.; Patel, N. N.; Alex, P.

    2014-04-24

    Nickel based alloys are being projected as suitable materials for some components of the next generation fusion reactor because of compatible thermal, electrical and mechanical properties. Pure nickel material is tested here for possibility of similar application purpose. Nickel samples (> 99.5 % purity) are exposed here to plasma radiations produced due to D-D fusion reaction inside an 11.5 kJ plasma focus device. The changes in the physical properties of the nickel surface at microscopic level which in turn change the mechanical properties are analyzed using scanning electron microscope, optical microscope, glancing incident X-ray diffractometer and Vicker's hardness gauge. The results are reported here.

  3. Fusion barrier distributions in systems with finite excitation energy

    E-Print Network [OSTI]

    K. Hagino; N. Takigawa; A. B. Balantekin

    1997-06-24

    Eigen-channel approach to heavy-ion fusion reactions is exact only when the excitation energy of the intrinsic motion is zero. In order to take into account effects of finite excitation energy, we introduce an energy dependence to weight factors in the eigen-channel approximation. Using two channel problem, we show that the weight factors are slowly changing functions of incident energy. This suggests that the concept of the fusion barrier distribution still holds to a good approximation even when the excitation energy of the intrinsic motion is finite. A transition to the adiabatic tunneling, where the coupling leads to a static potential renormalization, is also discussed.

  4. ACCELERATOR & FUSION RESEARCH DIV. ANNUAL REPORT, OCT. 79 - SEPT. 80

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    and D. Keefe, "Inertial Confinement Fusion Systems Usingpresented at the Inertial Confinement Fusion Conf. , Sanapplication to inertial confinement fusion. Betatrons

  5. Research on fusion neutron sources

    SciTech Connect (OSTI)

    Gryaznevich, M. P. [Tokamak Solutions UK, Culham Science Centre, Abingdon, OXON, OX133DB (United Kingdom)

    2012-06-19

    The use of fusion devices as powerful neutron sources has been discussed for decades. Whereas the successful route to a commercial fusion power reactor demands steady state stable operation combined with the high efficiency required to make electricity production economic, the alternative approach to advancing the use of fusion is free of many of complications connected with the requirements for economic power generation and uses the already achieved knowledge of Fusion physics and developed Fusion technologies. 'Fusion for Neutrons' (F4N), has now been re-visited, inspired by recent progress achieved on comparably compact fusion devices, based on the Spherical Tokamak (ST) concept. Freed from the requirement to produce much more electricity than used to drive it, a fusion neutron source could be efficiently used for many commercial applications, and also to support the goal of producing energy by nuclear power. The possibility to use a small or medium size ST as a powerful or intense steady-state fusion neutron source (FNS) is discussed in this paper in comparison with the use of traditional high aspect ratio tokamaks. An overview of various conceptual designs of compact fusion neutron sources based on the ST concept is given and they are compared with a recently proposed Super Compact Fusion Neutron Source (SCFNS), with major radius as low as 0.5 metres but still able to produce several MW of neutrons in a steady-state regime.

  6. MIT Plasma Science and Fusion Center Design Report

    E-Print Network [OSTI]

    McDonald, Kirk

    P.H. Titus MIT Plasma Science and Fusion Center Design Report MERIT (MERcury Intense Target) BNL be purchased and installed in the cryostat later. The conductor is half inch square, cold worked OFHC copper impregnated. Wound coils of this small radius, using cold worked conductor, retain internal elastic stresses

  7. Fusion Energy Division progress report, January 1, 1992--December 31, 1994

    SciTech Connect (OSTI)

    Sheffield, J.; Baker, C.C.; Saltmarsh, M.J.; Shannon, T.E.

    1995-09-01

    The report covers all elements of the ORNL Fusion Program, including those implemented outside the division. Non-fusion work within FED, much of which is based on the application of fusion technologies and techniques, is also discussed. The ORNL Fusion Program includes research and development in most areas of magnetic fusion research. The program is directed toward the development of fusion as an energy source and is a strong and vital component of both the US and international fusion efforts. The research discussed in this report includes: experimental and theoretical research on magnetic confinement concepts; engineering and physics of existing and planned devices; development and testing of plasma diagnostic tools and techniques; assembly and distribution of databases on atomic physics and radiation effects; development and testing of technologies for heating and fueling fusion plasmas; and development and testing of materials for fusion devices. The activities involving the use of fusion technologies and expertise for non-fusion applications ranged from semiconductor manufacturing to environmental management.

  8. Polyneutron Chain Reactions

    SciTech Connect (OSTI)

    John C. Fisher

    2000-11-12

    Although helium atoms do not form molecules, a sufficiently large number will bind into a stable liquid droplet. A comparable situation is expected for neutrons, with a sufficiently large number binding into a stable droplet of neutron matter. Such polyneutron droplets can be viewed as isotopes of an element with nuclear charge Z=0, tentatively denoted neutrium, symbol Nt. Because of the relatively weak binding of neutrons compared with that of a mix of neutrons and protons, the minimum number of neutrons required for stability of a droplet is fairly large. Early estimates of {approx}60 may be reduced to a dozen or so by the BCS pairing interaction. The Nt entries with N{>=}12 are new to the table of isotopes. Because all of them are beta-unstable, none is expected to persist as a free particle. Yet, some may occasionally be produced by means to be described below, and it is of interest to examine their decay chains and their interactions with charged nuclei to ascertain how their presence might be revealed. Although these reactions are interesting, they cannot be taken seriously without identifying a source for the initial Nt isotope that begins the chain. Here, we consider possible interactions between {sup 16}O and {sup A}Nt. Although there is no strong interaction between them, we can expect a very weak residual attraction that can form a loosely bound {sup 16}O {sup A}Nt nuclear molecule. This is not a compound nucleus in the usual sense because, considered as fluids, the {sup 16}O and {sup A}Nt droplets are immiscible. For a droplet with fewer than about 60 neutrons, beta decay of {sup A}Nt is prevented by the buildup of Coulomb energy associated with transforming {sup A}Nt into {sup A}H in close proximity to {sup 16}O. Thus, it is possible that {sup 16}O {sup A}Nt molecules can persist indefinitely and that a few of them may be present in ordinary water as supermassive oxygen nuclei. Because the binding of these molecules is weak, the {sup A}Nt component can tunnel to an adjacent nucleus, and if the adjacent nucleus is {sup 18}O, a chain reaction can begin. The circumstances under which it can develop to produce macroscopic consequences depend on the mix of reactants and upon the appropriate removal of poisons and addition of fresh reactants to the reaction volume. With the proper conditions, there can be generation of sensible excess energy, helium, and other reaction products associated with the various cold fusion reactions.

  9. Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics Summary Magnetized Target Fusion: Insights from

    E-Print Network [OSTI]

    Fournier, John J.F.

    Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics Summary Magnetized, Committee Member November 28, 2014 Michael Lindstrom Magnetized Target Fusion #12;Introduction to nuclear Target Fusion #12;Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics

  10. Fusion pumped laser

    DOE Patents [OSTI]

    Pappas, D.S.

    1987-07-31

    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.

  11. Fusion ProgramFusion Program Overview at Los Alamos

    E-Print Network [OSTI]

    Fusion ProgramFusion Program Overview at Los Alamos G. A. Wurden Fusion Power Associates Symposiumy by the Los Alamos National Security, LLC for the DOE/NNSA Slide 1 LA-UR 09-07809 #12;ABSTRACT OUTLINERIE U N C L A S S I F I E D Operated by the Los Alamos National Security, LLC for the DOE/NNSA Slide 2

  12. Modular Aneutronic Fusion Engine

    SciTech Connect (OSTI)

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

    2012-05-11

    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. __________________________________________________

  13. (Fusion energy research)

    SciTech Connect (OSTI)

    Phillips, C.A.

    1988-01-01

    This report discusses the following topics: principal parameters achieved in experimental devices (FY88); tokamak fusion test reactor; Princeton beta Experiment-Modification; S-1 Spheromak; current drive experiment; x-ray laser studies; spacecraft glow experiment; plasma deposition and etching of thin films; theoretical plasma; tokamak modeling; compact ignition tokamak; international thermonuclear experimental reactor; Engineering Department; Project Planning and Safety Office; quality assurance and reliability; and technology transfer.

  14. Fusion rate enhancement due to energy spread of colliding nuclei

    E-Print Network [OSTI]

    G. Fiorentini; C. Rolfs; F. L. Villante; B. Ricci

    2002-10-24

    Experimental results for sub-barrier nuclear fusion reactions show cross section enhancements with respect to bare nuclei which are generally larger than those expected according to electron screening calculations. We point out that energy spread of target or projectile nuclei is a mechanism which generally provides fusion enhancement. We present a general formula for calculating the enhancement factor and we provide quantitative estimate for effects due to thermal motion, vibrations inside atomic, molecular or crystal system, and due to finite beam energy width. All these effects are marginal at the energies which are presently measurable, however they have to be considered in future experiments at still lower energies. This study allows to exclude several effects as possible explanation of the observed anomalous fusion enhancements, which remain a mistery.

  15. Nuclear fusion in muonic deuterium-helium complex

    E-Print Network [OSTI]

    V. M. Bystritsky; M. Filipowicz; V. V. Gerasimov; P. E. Knowles; F. Mulhauser; N. P. Popov; V. A. Stolupin; V. P. Volnykh; J. Wozniak

    2005-06-22

    Experimental study of the nuclear fusion reaction in charge-asymmetrical d-mu-3He complex is presented. The 14.6 MeV protons were detected by three pairs of Si(dE-E) telescopes placed around the cryogenic target filled with the deuterium + helium-3 gas at 34 K. The 6.85 keV gamma rays emitted during the de-excitation of d-mu-3He complex were detected by a germanium detector. The measurements were performed at two target densities, 0.0585 and 0.169 (relative to liquid hydrogen density) with an atomic concentration of 3He c=0.0469. The values of the effective rate of nuclear fusion in d-mu-3He was obtained for the first time, and the J=0 nuclear fusion rate in d-mu-3He was derived.

  16. Project Profile: Integrated Solar Thermochemical Reaction System...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    to drive a chemical reaction that produces a gas capable of offsetting the need for fossil fuels in traditional power plants. Approach The research team is working to...

  17. One-dimensional particle simulations of Knudsen-layer effects on D-T fusion

    SciTech Connect (OSTI)

    Cohen, Bruce I.; Dimits, Andris M.; Zimmerman, George B.; Wilks, Scott C.

    2014-12-15

    Particle simulations are used to solve the fully nonlinear, collisional kinetic equation describing the interaction of a high-temperature, high-density, deuterium-tritium plasma with absorbing boundaries, a plasma source, and the influence of kinetic effects on fusion reaction rates. Both hydrodynamic and kinetic effects influence the end losses, and the simulations show departures of the ion velocity distributions from Maxwellian due to the reduction of the population of the highest energy ions (Knudsen-layer effects). The particle simulations show that the interplay between sources, plasma dynamics, and end losses results in temperature anisotropy, plasma cooling, and concomitant reductions in the fusion reaction rates. However, for the model problems and parameters considered, particle simulations show that Knudsen-layer modifications do not significantly affect the velocity distribution function for velocities most important in determining the fusion reaction rates, i.e., the thermal fusion reaction rates using the local densities and bulk temperatures give good estimates of the kinetic fusion reaction rates.

  18. Magnetized Target Fusion: Input to the 35-yr Fusion Long-Range Electric Plan

    E-Print Network [OSTI]

    Magnetized Target Fusion: Input to the 35-yr Fusion Long-Range Electric Plan G. A. Wurden Fusion to the 35-yr Fusion Long-Range Electric Plan · Imagine a fusion concept where: · The plasma beta ranges from to the 35-yr Fusion Long-Range Electric Plan · MTF offers a uniquely different pathway to achieving

  19. Numerical Simulation on Laser Fusion in China

    SciTech Connect (OSTI)

    Zhu Shaoping; Pei Wenbing; Xu Yan; Gu Peijun; Lan Ke; Ye Wenhua; Wu Junfeng; Li Jinghong; Gao Yaoming; Zheng Chunyang; Li Shuanggui; Mo Zeyao; Yan Jun [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Zhang Weiyan [National High-Tech Inertial Confinement Fusion Committee of China, Beijing 100088 (China)

    2009-05-02

    Numerical simulation is a powerful tool to get insight into the physics of laser fusion. Much effort has been devoted to develop the numerical simulation code series named LARED in China. The code series LARED are composed of six parts and enable us to have the simulation capability for the key processes in laser fusion. In recent years, a number of numerical simulations using LARED have been carried out and the simulation is checked by experiments done at the laser facility SG-II and SG-III prototype. In the present talk, some details of LARED code series will be introduced, and some simulation results, especially recent work on the opacities, will be shown.

  20. Magnetized Target Fusion Collaboration. Final report

    SciTech Connect (OSTI)

    John Slough

    2012-04-18

    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.

  1. Fusion reactions in nuclear astrophysics: The MUSIC approach

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFESOpportunities Nuclear Physics (NP) NP HomeSciences

  2. Mitochondrial Fusion and Fission in Mammals

    E-Print Network [OSTI]

    Chan, David

    Mitochondrial Fusion and Fission in Mammals David C. Chan Division of Biology, California Institute dynamics, organelle morphology, membrane fusion, membrane trafficking Abstract Eukaryotic cells maintain. Unbalanced fission leads to mitochondrial fragmentation, and un- balanced fusion leads to mitochondrial

  3. NUCLEAR STRUCTURE AND HEAVY-ION FUSION

    E-Print Network [OSTI]

    Stokstad, R.G.

    2010-01-01

    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

  4. Fusion Energy Division annual progress report period ending December 31, 1986

    SciTech Connect (OSTI)

    Morgan, O.B. Jr.; Berry, L.A.; Sheffield, J.

    1987-10-01

    This annual report on fusion energy discusses the progress on work in the following main topics: toroidal confinement experiments; atomic physics and plasma diagnostics development; plasma theory and computing; plasma-materials interactions; plasma technology; superconducting magnet development; fusion engineering design center; materials research and development; and neutron transport. (LSP)

  5. Annual Report of the EURATOM/UKAEA Fusion Programme 2006/07 3 JET Studies

    E-Print Network [OSTI]

    Annual Report of the EURATOM/UKAEA Fusion Programme 2006/07 3.1 3 JET Studies 3 JET STUDIES 3.1 OVERVIEW 3.1.1 JET'S STATUS Under the European Fusion Development Agreement (EFDA), the JET facility are responsible for the detailed implementation of the JET work programme; during 2006/7 UKAEA had Task Force

  6. THEORY OF CHEMICAL REACTION ANTONIO LAGANA

    E-Print Network [OSTI]

    Auzinsh, Marcis

    THEORY OF CHEMICAL REACTION DYNAMICS Edited by: ANTONIO LAGANA Department of Chemistry University Theoretical treatment of the dynamics of chemical reactions has undergone a spectacular development during the NATO Advanced Research Work- shop on the Theory of the Dynamics of Chemical Reactions in Balatonf

  7. FIREBALL: Fusion Ignition Rocket Engine with Ballistic Ablative Lithium Liner

    SciTech Connect (OSTI)

    Martin, Adam K.; Eskridge, Richard H.; Lee, Michael H. [Propulsion Research Center, NASA Marshall Space Flight Center XD22, Huntsville, AL 35812 (United States); Fimognari, Peter J. [Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899 (United States)

    2006-01-20

    Thermo-nuclear fusion may be the key to a high Isp, high specific power propulsion system. In a fusion system energy is liberated within, and imparted directly to, the propellant. In principle, this can overcome the performance limitations inherent in systems that require thermal power transfer across a material boundary, and/or multiple power conversion stages (NTR, NEP). A thermo-nuclear propulsion system, which attempts to overcome some of the problems inherent in the Orion concept, is described. A dense FRC plasmoid is accelerated to high velocity (in excess of 500 km/s) and is compressed into a detached liner (pulse unit). The kinetic energy of the FRC is converted into thermal and magnetic-field energy, igniting a fusion burn in the magnetically confined plasma. The fusion reaction serves as an ignition source for the liner, which is made out of detonable materials. The energy liberated in this process is converted to thrust by a pusher-plate, as in the classic Orion concept. However with this concept, the vehicle does not carry a magazine of autonomous pulse-units. By accelerating a second, heavier FRC, which acts as a piston, right behind the first one, the velocity required to initiate the fusion burn is greatly reduced.

  8. Fusion at deep subbarrier energies: potential inversion revisited

    E-Print Network [OSTI]

    K. Hagino; N. Rowley

    2008-11-15

    For a single potential barrier, the barrier penetrability can be inverted based on the WKB approximation to yield the barrier thickness. We apply this method to heavy-ion fusion reactions at energies well below the Coulomb barrier and directly determine the inter-nucleus potential between the colliding nuclei. To this end, we assume that fusion cross sections at deep subbarrier energies are governed by the lowest barrier in the barrier distribution. The inverted inter-nucleus potentials for the $^{16}$O +$^{144}$Sm and $^{16}$O +$^{208}$Pb reactions show that they are much thicker than phenomenological potentials. We discuss a consequence of such thick potential by fitting the inverted potentials with the Bass function.

  9. Fusion Cross Section in the {sup 4,6}He+{sup 64}Zn Collisions Around the Coulomb Barrier

    SciTech Connect (OSTI)

    Fisichella, M.; Di Pietro, A.; Figuera, P.; Marchetta, C.; Lattuada, M.; Musumarra, A.; Pellegriti, M. G.; Scuderi, V.; Strano, E.; Torresi, D.; Milin, M.; Skukan, N.; Zadro, M.

    2011-10-28

    New fusion data for the {sup 4}He+{sup 64}Zn system at sub-barrier energies are measured to cover the same energy region of previous measurements for {sup 6}He+{sup 64}Zn. Aim of the experiment was to compare the fusion excitation functions for the two system to investigate on the effects of the {sup 6}He neutron-halo structure on the fusion reaction mechanism at energies around the Coulomb barrier. The fusion cross section was measured by using an activation technique. Comparing the two systems, we observe an enhancement of the fusion cross section in the reaction induced by {sup 6}He, at and below the Coulomb barrier.

  10. 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]

    Kwan, J.W.

    2008-01-01

    Fusion Science, Magnetic Fusion Energy, and Related Fieldsof Science, Office of Fusion Energy Sciences, of the U.S.Fusion Science, Magnetic Fusion Energy, and Related Fields

  11. Fusion for Neutrons as a Necessary Step to Commercial Fusion

    E-Print Network [OSTI]

    MWe #12; Fast track to Fusion for Energy is defined: ITER ~2020 DEMO ~2035 FPP ~2050 New products (per energy released) than fission by a factor of 20 · What is bad for energy production is good for neutron production The current trend: «Neutrons (not energy!) may become the first product of fusion» #12

  12. Activities of the University Fusion Association! D.P. Brennan

    E-Print Network [OSTI]

    Program"! !- D. Meade (Fusion Innovation Research and Energy): "Framework for a Roadmap to Magnetic Fusion

  13. INERTIAL FUSION DRIVEN BY INTENSE HEAVY-ION BEAMS

    E-Print Network [OSTI]

    Sharp, W. M.

    2011-01-01

    Accelerators for Inertial Confinement Fusion,” Proc. IAEAbriefly compares inertial confinement fusion (ICF) to the

  14. Study of internal magnetic field via polarimetry in fusion plasmas

    E-Print Network [OSTI]

    Zhang, Jie

    2013-01-01

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

  15. Stochastic Semi-Classical Description of Fusion at Near-Barrier Energies

    E-Print Network [OSTI]

    Sakir Ayik; Bulent Yilmaz; Denis Lacroix

    2010-03-18

    Fusion reactions of heavy ions are investigated by employing a simple stochastic semi-classical model which includes the coupling between 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. Good agreement with the result of coupled-channels calculations as well as data is obtained for the fusion cross sections of nickel isotopes. The internal excitations in non-fusing events as well as the fusion time are investigated.

  16. Fusion of {sup 48}Ca+{sup 48}Ca Far Below the Barrier

    SciTech Connect (OSTI)

    Scarlassara, F.; Montagnoli, G.; Mason, P.; Stefanini, A. M.; Silvestri, R.; Corradi, L.; Fioretto, E.; Guiot, B.; Courtin, S.; Haas, F.; Lebhertz, D.; Szilner, S.

    2009-08-26

    In recent years, a puzzling pattern has been observed in fusion cross sections well below the Coulomb barrier, characterized as a departure from the exponential-like behavior predicted by standard coupled-channels models, known as fusion hindrance. We report on recent fusion measurements performed at the Laboratori Nazionali di Legnaro, in particular the {sup 48}Ca+{sup 48}Ca reaction down to the level of 0.6 {mu}b. Unlike most recent results in this field, we do not observe the typical divergent behavior of the logarithmic derivative; but rather a sort of saturation, albeit at a larger value than predicted with a standard nucleus-nucleus potential.

  17. Workshop on Accelerators for Heavy Ion Fusion Summary Report of the Workshop

    E-Print Network [OSTI]

    Seidl, P.A.

    2013-01-01

    ion inertial fusion," Nuclear Fusion, Vol. 33, No. 4 (1993)ion inertial fusion energy,” Nuclear Fusion 45 (2005) S291–

  18. Peregrinations on cold fusion

    SciTech Connect (OSTI)

    Turner, L.

    1989-01-01

    Attention is focused on the possibility of resonance-enhanced deuteron Coulomb barrier penetration. Because of the many-body nature of the interactions of room-temperature deuterons diffusing through a lattice possessing deuterons in many of the interstitial positions, the diffusing deuterons can resonate on the atomic scale in the potential wells bounded by the ascending walls of adjacent Coulomb barriers and thereby penetrate the Coulomb barriers in a fashion vastly underestimated by two-body calculations in which wells for possible resonance are absent. Indeed, perhaps the lack of robust reproducibility in cold fusion originates from the narrowness of such transmission resonances. 4 refs., 1 fig.

  19. Fusion reactor pumped laser

    DOE Patents [OSTI]

    Jassby, Daniel L. (Princeton, NJ)

    1988-01-01

    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.

  20. Fusion Energy Sciences

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFESOpportunities Nuclear Physics (NP) NP Home AboutFusion Energy

  1. Harmonic bundles, topological-antitopological fusion

    E-Print Network [OSTI]

    Henri Poincaré -Nancy-Université, Université

    Harmonic bundles, topological-antitopological fusion and the related pluriharmonic maps Lars Sch associated to a harmonic bundle 7 1 Introduction Topological-antitopological fusion or tt -geometry

  2. On the Structure of the Fusion Ideal

    E-Print Network [OSTI]

    Douglas, Christopher L.

    2009-01-01

    of the fusion ideal. Theorem 4.3. For G a compact, simple,of the fusion ideal follows. Theorem 1.3. For G a compact,

  3. CONTROL OF MECHANICALLY ACTIVATED POLYMERSOME FUSION: FACTORS...

    Office of Scientific and Technical Information (OSTI)

    MECHANICALLY ACTIVATED POLYMERSOME FUSION: FACTORS AFFECTING FUSION. Henderson, Ian M.; Paxton, Walter F Abstract not provided. Sandia National Laboratories (SNL-NM), Albuquerque,...

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

    SciTech Connect (OSTI)

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

    2008-04-15

    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 {sup 24}O+{sup 24}O and {sup 28}Ne+{sup 28}Ne. 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 {sup 24}O+{sup 24}O fusion and find that {sup 24}O should burn at densities near 10{sup 11} g/cm{sup 3}. The energy released from this and similar reactions may be important for the temperature profile of the star.

  5. Fusion of neutron rich oxygen isotopes in the crust of accreting neutron stars

    E-Print Network [OSTI]

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

    2008-04-07

    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 $Z\\le 6$ 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 $^{24}$O + $^{24}$O and $^{28}$Ne + $^{28}$Ne. 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 $^{24}$O + $^{24}$O fusion and find that $^{24}$O should burn at densities near $10^{11}$ g/cm$^3$. The energy released from this and similar reactions may be important for the temperature profile of the star.

  6. No end in sight for nuclear squabble The decision on a site for a controversial nuclear fusion project has been delayed

    E-Print Network [OSTI]

    No end in sight for nuclear squabble The decision on a site for a controversial nuclear fusion supply, and fusion reactors would not produce fissile materials that could be used in nuclear weapons, with green groups pointing out that in 1950 scientists working on nuclear fusion said they needed another 50

  7. Species separation and modification of neutron diagnostics in inertial-confinement fusion

    E-Print Network [OSTI]

    Inglebert, Aurelie; Larroche, Olivier

    2014-01-01

    The different behaviours of deuterium (D) and tritium (T) in the hot spot of marginally-igniting cryogenic DT inertial-confinement fusion (ICF) targets are investigated with an ion Fokker-Planck model. With respect to an equivalent single-species model, a higher density and a higher temperature are found for T in the stagnation phase of the target implosion. In addition, the stagnating hot spot is found to be less dense but hotter than in the single-species case. As a result, the fusion reaction yield in the hot spot is significantly increased. Fusion neutron diagnostics of the implosion find a larger ion temperature as deduced from DT reactions than from DD reactions, in good agreement with NIF experimental results. ICF target designs should thus definitely take ion-kinetic effects into account.

  8. Course: FUSION SCIENCE AND ENGINEERING Universit degli Studi di Padova

    E-Print Network [OSTI]

    Cesare, Bernardo

    the subject of controlled thermonuclear fusion in magnetically confined plasmas. Both fusion science of Controlled Thermonuclear Fusion, b) Engineering of a Magnetically Confined Fusion Reactor, c) ExperimentalCourse: FUSION SCIENCE AND ENGINEERING Università degli Studi di Padova in agreement

  9. Journal of Fusion Energy, Vol. 18, No. 4, 1999 Report of the FEAC Inertial Fusion Energy Review Panel

    E-Print Network [OSTI]

    Abdou, Mohamed

    Journal of Fusion Energy, Vol. 18, No. 4, 1999 Report of the FEAC Inertial Fusion Energy Review. S. Department of Energy Fusion Energy Advisory Committee (FEAC) review of its Inertial Fusion Energy of California at San Diego. KEY WORDS: Fusion; fusion science; fusion energy; inertial fusion energy. I. SUMMARY

  10. A REALISTIC EXAMINATION OF COLD FUSION CLAIMS 24 YEARS LATER

    SciTech Connect (OSTI)

    Shanahan, K.

    2012-10-22

    On March 29, 1989, chemists Martin Fleischmann and Stanley Pons announced they had discovered an effect whose explanation was required to lie in the realm of nuclear reactions. Their claim, and those subsequent to it of roughly similar nature, became known as ‘cold fusion’. Research continues to this day on this effect, but what has become clear is that whatever it is, it is not a conventional fusion process. Thus the ‘cold fusion’ moniker is somewhat inappropriate and many current researchers in the field prefer the term “Low Energy Nuclear Reactions (LENR)”, although other terms have been coined for it as well. the results developed out of the LENR research do in fact show something is happening to produce signals which might be interpreted as supporting nuclear reactions (which is what encourages and sustains LENR researchers), but which can also be interpreted via a set of unique and interesting conventional processes. The focus of this document is to describe and address recent objections to such processes so that subsequent LENR research can be guided to develop information that will determine whether either set of explanations has merit. It is hoped that criteria delineated herein will aid the USDOE and other agencies in determining if LENR proposals are meritorious and worthy of support or not.

  11. EURATOM/CCFE Fusion Association

    E-Print Network [OSTI]

    In Europe, fusion research is co-ordinated by EURATOM with the overall aim of developing power stations that harness on earth the process that powers the sun. Fusion power stations would emit no greenhouse gases on a power-plant scale (500 MW) and test key technologies for power stations like that will be needed

  12. Fusion Energy 101 Jeff Freidberg

    E-Print Network [OSTI]

    : · Huge resources ­ a renewable · No CO2 emissions · No pollution · Inherently safe · No proliferation of a plasma 17 #12;Properties of a fusion plasma · We need enough plasma: (air/100,000) · At a high enough temperature: (air x million) · Holding its heat for a long enough time: · For a sustained fusion plasma

  13. Fusion algebra of critical percolation

    E-Print Network [OSTI]

    Jorgen Rasmussen; Paul A. Pearce

    2007-08-08

    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.

  14. Cellulose binding domain fusion proteins

    DOE Patents [OSTI]

    Shoseyov, O.; Yosef, K.; Shpiegl, I.; Goldstein, M.A.; Doi, R.H.

    1998-02-17

    A cellulose binding domain (CBD) having a high affinity for crystalline cellulose and chitin is disclosed, along with methods for the molecular cloning and recombinant production. Fusion products comprising the CBD and a second protein are likewise described. A wide range of applications are contemplated for both the CBD and the fusion products, including drug delivery, affinity separations, and diagnostic techniques. 16 figs.

  15. Cellulose binding domain fusion proteins

    DOE Patents [OSTI]

    Shoseyov, Oded (Karmey Yosef, IL); Shpiegl, Itai (Rehovot, IL); Goldstein, Marc A. (Davis, CA); Doi, Roy H. (Davis, CA)

    1998-01-01

    A cellulose binding domain (CBD) having a high affinity for crystalline cellulose and chitin is disclosed, along with methods for the molecular cloning and recombinant production thereof. Fusion products comprising the CBD and a second protein are likewise described. A wide range of applications are contemplated for both the CBD and the fusion products, including drug delivery, affinity separations, and diagnostic techniques.

  16. 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

  17. Overview of ORNL Fusion Program

    E-Print Network [OSTI]

    , 2009 #12;Develop the understanding required for an attractive fusion energy source through integrated Sciences 4 Leadership Computing Facility 5 Fusion Energy Div. 6 Measurement Science and Systems Div. 7, and disseminate data to the plasma science community Multi-charged Ion Research Facility #12;· Develop fundamental

  18. Gas Transport and Control in Thick-Liquid Inertial Fusion Power Plants

    E-Print Network [OSTI]

    Debonnel, Christophe Sylvain

    2006-01-01

    Fusion Energy . . . . . . . . . . . . . . . . . . . . . . . . .Fusion Energy . . . . . . . . . . . . . . . . . . . . .of Energy’s inertial fusion energy program. Journal of

  19. Chemical Reactions at Surfaces

    SciTech Connect (OSTI)

    Michael Henderson and Nancy Ryan Gray

    2010-04-14

    Chemical reactions at surfaces underlie some of the most important processes of today, including catalysis, energy conversion, microelectronics, human health and the environment. Understanding surface chemical reactions at a fundamental level is at the core of the field of surface science. The Gordon Research Conference on Chemical Reactions at Surfaces is one of the premiere meetings in the field. The program this year will cover a broad range of topics, including heterogeneous catalysis and surface chemistry, surfaces in environmental chemistry and energy conversion, reactions at the liquid-solid and liquid-gas interface, electronic materials growth and surface modification, biological interfaces, and electrons and photons at surfaces. An exciting program is planned, with contributions from outstanding speakers and discussion leaders from the international scientific community. The conference provides a dynamic environment with ample time for discussion and interaction. Attendees are encouraged to present posters; the poster sessions are historically well attended and stimulate additional discussions. The conference provides an excellent opportunity for junior researchers (e.g. graduate students or postdocs) to present their work and interact with established leaders in the field.

  20. Screened thermonuclear reactions and predictive stellar evolution of detached double-lined eclipsing binaries

    E-Print Network [OSTI]

    Theodore Liolios; Theocharis Kosmas

    2005-07-06

    The low energy fusion cross sections of charged-particle nuclear reactions (and the respective reaction rates) in stellar plasmas are enhanced due to plasma screening effects. We study the impact of those effects on predictive stellar evolution simulations for detached double-lined eclipsing binaries. We follow the evolution of binary systems (pre-main sequence or main sequence stars) with precisely determined radii and masses from 1.1Mo to 23Mo (from their birth until their present state). The results indicate that all the discrepancies between the screened and unscreened models (in terms of luminosity, stellar radius, and effective temperature) are within the observational uncertainties. Moreover, no nucleosynthetic or compositional variation was found due to screening corrections. Therefore all thermonuclear screening effects on the charged-particle nuclear reactions that occur in the binary stars considered in this work (from their birth until their present state) can be totally disregarded. In other words, all relevant charged-particle nuclear reactions can be safely assumed to take place in a vacuum, thus simplifying and accelerating the simulation processes.

  1. 2005 7th International Conference on Information Fusion (FUSION) Construction of a Geospatial Predictor by Fusion of

    E-Print Network [OSTI]

    Obradovic, Zoran

    2005 7th International Conference on Information Fusion (FUSION) Construction of a Geospatial Predictor by Fusion of Global and Local Models 1~ ~ ~~ 121 Bo Han1, Slobodan Vucetic', Amy Braverman , Zoran, the fusion model is significantly more successful, achieving R2 accuracy above 0.50. In addition, accuracy

  2. Effects of nuclear deformation and neutron transfer in capture process, and origin of fusion hindrance at deep sub-barrier energies

    E-Print Network [OSTI]

    V. V. Sargsyan; G. G. Adamian; N. V. Antonenko; W. Scheid; H. Q. Zhang

    2011-11-30

    The roles of nuclear deformation and neutron transfer in sub-barrier capture process are studied within the quantum diffusion approach. The change of the deformations of colliding nuclei with neutron exchange can crucially influence the sub-barrier fusion. The comparison of the calculated capture cross section and the measured fusion cross section in various reactions at extreme sub- barrier energies gives us information about the fusion and quasifission.

  3. LiWall Fusion - The New Concept of Magnetic Fusion

    SciTech Connect (OSTI)

    L.E. Zakharov

    2011-01-12

    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.

  4. Integrated Solar Thermochemical Reaction System

    Broader source: Energy.gov [DOE]

    This fact sheet describes an integrated solar thermochemical reaction system project awarded under the DOE's 2012 SunShot Concentrating Solar Power R&D award program. The team, led by the Pacific Northwest National Laboratory, is working to develop and demonstrate a high-performance solar thermochemical reaction system in an end-to-end demonstration that produces electricity. A highly efficient solar thermochemical reaction system would allow for 24-hour operation without the need for storage technology, and reductions in total system costs while providing a relatively low-risk deployment option for CSP systems.

  5. Determination of Atomic Data Pertinent to the Fusion Energy Program

    SciTech Connect (OSTI)

    Reader, J.

    2013-06-11

    We summarize progress that has been made on the determination of atomic data pertinent to the fusion energy program. Work is reported on the identification of spectral lines of impurity ions, spectroscopic data assessment and compilations, expansion and upgrade of the NIST atomic databases, collision and spectroscopy experiments with highly charged ions on EBIT, and atomic structure calculations and modeling of plasma spectra.

  6. Dynamic Cryogenic Seals to Support Fueling of Fusion Tokomaks

    E-Print Network [OSTI]

    Collins, Gary S.

    Dynamic Cryogenic Seals to Support Fueling of Fusion Tokomaks U. Naranjo and J. W. Leachman School ACKNOWLEDGEMENTS This work was supported by the National Science Foundation's REU program under grant number EEC seal and bolt, and running the experiment once more to ensure an adequate seal. In the future this test

  7. Image Fusion for MR Bias Stochastic Systems Group

    E-Print Network [OSTI]

    Willsky, Alan S.

    We can target T1 and T2 through appropriate selection of TE and TR. #12;Image Reconstruction The MRImage Fusion for MR Bias Correction Ayres Fan Stochastic Systems Group Joint work with W. Wells, J. Fisher, M. Cetin, S. Haker, A. Willsky, B. Mulkern #12;Magnetic Resonance The magnetic resonance (MR

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

    E-Print Network [OSTI]

    Thompson, Mary R.

    (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

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

    E-Print Network [OSTI]

    Casazza, Pete

    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

  10. Science/Fusion Energy Sciences FY 2006 Congressional Budget Fusion Energy Sciences

    E-Print Network [OSTI]

    community. Benefits Fusion is the energy source that powers the sun and stars. In the fusion process, formsScience/Fusion Energy Sciences FY 2006 Congressional Budget Fusion Energy Sciences Funding Profile Adjustments FY 2005 Comparable Appropriation FY 2006 Request Fusion Energy Sciences Science

  11. MAST Upgrade Advancing compact fusion sources

    E-Print Network [OSTI]

    MAST Upgrade Advancing compact fusion sources 4 1 Off) is the centrepiece of the UK's fusion programme. MAST has led studies into the spherical tokamak, a compact fusion research: · Make the case for a fusion Component Test Facility. · Add to the knowledge base for ITER

  12. RAPPORTEUR TALK FOR IAEA FUSION MEETING, BRUSSELS

    E-Print Network [OSTI]

    Watson, J.M.

    2010-01-01

    compact replacement for a Cockcroft-Walton injector. An exciting potential application for magnetic fusion

  13. Fusion Power Burn and ..... Steve Cowley

    E-Print Network [OSTI]

    Fusion Power Burn and ..... Steve Cowley UK Atomic Energy Authority and Imperial College to the realisation of fusion energy. 2013 #12;Fusion Today ­ questions? · "Fast Track to Fusion" ­ clear message. -- EFDA roadmap ­ clear message · US position ­ unclear, contradicts EU? -- FESAC panels 10 year plan

  14. Temperature & Nuclear Fusion 4 October 2011

    E-Print Network [OSTI]

    Militzer, Burkhard

    Temperature & Nuclear Fusion 4 October 2011 Goals · Review temperature in stars · Practice using the important energy scales for nuclear fusion Temperature 1. For each relation we regularly use in class temperature. #12;temperature & nuclear fusion 2 Nuclear Fusion 2. There are a few different energy scales

  15. Temperature & Nuclear Fusion 4 October 2011

    E-Print Network [OSTI]

    Militzer, Burkhard

    Temperature & Nuclear Fusion 4 October 2011 Goals · Review temperature in stars · Practice using the important energy scales for nuclear fusion Temperature 1. For each relation we regularly use in class-Boltzmann equation: L = 4R2 T4 . (d) In fusion energy generation: T . #12;temperature & nuclear fusion 2 Nuclear

  16. Fusion Lecture Summary Eugene S. Evans

    E-Print Network [OSTI]

    Budker, Dmitry

    Fusion Lecture Summary Eugene S. Evans Physics H190, University of California, Berkeley March 31. 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

  17. Fusion Protein Products Screen Purify Detect Cleave

    E-Print Network [OSTI]

    Lebendiker, Mario

    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

  18. 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

  19. Fusion Simulation Program (FSP) Xianzhu Tang

    E-Print Network [OSTI]

    of the national FSP planning team Fusion Power Associates 31st Annual Meeting and Symposium Fusion Energy: Focus for the fusion program ­ Clear need for multi-scale, multi-physics integration · The FSP will build Integrated Science Applications targeting these problems ­ Modeling tools for the whole fusion community · Science

  20. Fusion pumped laser

    DOE Patents [OSTI]

    Pappas, Daniel S. (Los Alamos, NM)

    1989-01-01

    Apparatus is provided for generating energy in the form of laser radiation. A tokamak fusion reactor is provided for generating a long, or continuous, pulse of high-energy neutrons. The tokamak design provides a temperature and a magnetic field which is effective to generate a neutron flux of at least 10.sup.15 neutrons/cm.sup.2.s. A conversion medium receives neutrons from the tokamak and converts the high-energy neutrons to an energy source with an intensity and an energy effective to excite a preselected lasing medium. The energy source typically comprises fission fragments, alpha particles, and radiation from a fission event. A lasing medium is provided which is responsive to the energy source to generate a population inversion which is effective to support laser oscillations for generating output radiation.

  1. Fusion Power Demonstration III

    SciTech Connect (OSTI)

    Lee, J.D.

    1985-07-01

    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.

  2. Fusion of conformal interfaces

    E-Print Network [OSTI]

    C. Bachas; I. Brunner

    2008-03-04

    We study the fusion of conformal interfaces in the c=1 conformal field theory. We uncover an elegant structure reminiscent of that of black holes in supersymmetric theories. The role of the BPS black holes is played by topological interfaces, which (a) minimize the entropy function, (b) fix through an attractor mechanism one or both of the bulk radii, and (c) are (marginally) stable under splitting. One significant difference is that the conserved charges are logarithms of natural numbers, rather than vectors in a charge lattice, as for BPS states. Besides potential applications to condensed-matter physics and number theory, these results point to the existence of large solution-generating algebras in string theory.

  3. Fusion reactor pumped laser

    DOE Patents [OSTI]

    Jassby, D.L.

    1987-09-04

    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.

  4. The National Ignition Facility and the Path to Fusion Energy

    SciTech Connect (OSTI)

    Moses, E

    2011-07-26

    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.

  5. 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]

    2013-01-01

    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

  6. Deuterium fusion through nonequilibrium induction

    SciTech Connect (OSTI)

    Fang, P.H. )

    1991-03-01

    This paper presents a deuterium fusion system that is based on the induction of fusion through a nonequilibrium thermodynamical configuration. Mechanical excitation using ultrasound is applied to a palladium electrode with deuterium-containing liquid, a mixture of palladium powder and deuterium-containing liquid, and a system of palladium and a highly compressed deuterium gas that approximates a deuterium solid. The ultrasound, when coupled with the medium of these systems, instantaneously creates a high temperature and pressure that would induce fusion between deuterons.

  7. FUSION SIMULATION PROJECT Integrated Simulation & Optimization of Fusion Systems

    E-Print Network [OSTI]

    Institute of Technology Stephen Jardin, Princeton Plasma Physics Laboratory Sergei Krasheninnikov scientific understanding and improvements in computer technology. However, full predictive modeling of fusion growth of computer speed, coupled with the high cost of large-scale experimental facilities, makes

  8. ANNUAL REPORT FOR ACCELERATOR & FUSION RESEARCH DIVISION. FISCAL YEAR 1979 OCTOBER 1978 - SEPTEMBER 1979

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    Rings Theory MAGNETIC FUSION ENERGY Neutral Beam SystemsDevelopment, Magnetic Fusion Energy, and Heavy Ion Fusion.M. McElhiney. MAGNETIC FUSION ENERGY The Magnetic Fusion

  9. Cryogenic system operating experience review for fusion applications

    SciTech Connect (OSTI)

    Cadwallader, L.C.

    1992-01-01

    This report presents a review of cryogenic system operating experiences, from particle accelerator, fusion experiment, space research, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of cryogenic component failure rates and accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with cryogenic systems are discussed, including ozone formation, effects of spills, and modeling spill behavior. This information should be useful to fusion system designers and safety analysts, such as the team working on the International Thermonuclear Experimental Reactor design.

  10. Joint Working Group for Fusion Safety | Princeton Plasma Physics Lab

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse Bergkamp Graduate student Subtask 4Photo of JohnDialysis Provider in the

  11. Nanoscale Chemical Imaging of a Working Catalyst

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of chemical processes. Watching Catalysts at Work Catalysts-substances that speed up chemical reactions without themselves being consumed-are essential to the production of...

  12. U. S. Fusion Energy Future

    SciTech Connect (OSTI)

    John A. Schmidt; Dan Jassby; Scott Larson; Maria Pueyo; Paul H. Rutherford

    2000-10-12

    Fusion implementation scenarios for the US have been developed. The dependence of these scenarios on both the fusion development and implementation paths has been assessed. A range of implementation paths has been studied. The deployment of CANDU fission reactors in Canada and the deployment of fission reactors in France have been assessed as possible models for US fusion deployment. The waste production and resource (including tritium) needs have been assessed. The conclusion that can be drawn from these studies is that it is challenging to make a significant impact on energy production during this century. However, the rapid deployment of fission reactors in Canada and France support fusion implementation scenarios for the US with significant power production during this century. If the country can meet the schedule requirements then the resource needs and waste production are found to be manageable problems.

  13. Cell fusion in Neurospora crassa 

    E-Print Network [OSTI]

    Lichius, Alexander

    2010-11-24

    The primary research aims of this thesis were the identification of novel cell fusion mutants of Neurospora crassa and the subsequent functional characterization of selected candidate proteins during conidial anastomosis ...

  14. Condensed hydrogen for thermonuclear fusion

    SciTech Connect (OSTI)

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

    2010-11-15

    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.

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

    E-Print Network [OSTI]

    Logan, B.G.

    2007-01-01

    J Perkins, (June 2007), to be submitted to Nuclear Fusion. [36] M Tabak 1996 Nuclear Fusion 36, No 2. [Atzeni, and C Ciampi, 1997 Nuclear Fusion 37, 1665. [38] B G

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

    E-Print Network [OSTI]

    Logan, B.G.

    2007-01-01

    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

  17. Laser fusion monthly -- August 1980

    SciTech Connect (OSTI)

    Ahlstrom, H.G.

    1980-08-01

    This report documents the monthly progress for the laser fusion research at Lawrence Livermore National Laboratory. First it gives facilities report for both the Shiva and Argus projects. Topics discussed include; laser system for the Nova Project; the fusion experiments analysis facility; optical/x-ray streak camera; Shiva Dante System temporal response; 2{omega}{sub 0} experiment; and planning for an ICF engineering test facility.

  18. Systematic study of projectile structure effect on fusion barrier distribution

    E-Print Network [OSTI]

    Pratap Roy; A. Saxena; B. K. Nayak; E. T. Mirgule; B. John; Y. K. Gupta; L. S. Danu; R. P. Vind; Ashok Kumar; R. K. Choudhury

    2011-07-29

    Quasielastic excitation function measurement has been carried out for the $^{4}$He + $^{232}$Th system at $\\theta_{lab}$=160$^\\circ$ with respect to the beam direction, to obtain a representation of the fusion barrier distribution. Using the present data along with previously measured barrier distribution results on $^{12}$C, $^{16}$O, and $^{19}$F + $^{232}$Th systems a systematic analysis has been carried out to investigate the role of target and/or projectile structures on fusion barrier distribution. It is observed that for $^{4}$He, $^{12}$C, and $^{16}$O + $^{232}$Th, reactions the couplings due to target states only are required in coupled channel fusion calculations to explain the experimental data, whereas for the $^{19}$F+ $^{232}$Th system along with the coupling of target states, inelastic states of $^{19}$F are also required to explain the experimental results on fusion-barrier distribution. The width of the barrier distribution shows interesting transition behavior when plotted with respect to the target-projectile charge product for the above systems.

  19. Using Radio Waves to Control Fusion Plasma Density

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Using Radio Waves to Control Fusion Plasma Density Using Radio Waves to Control Fusion Plasma Density Simulations Run at NERSC Support Fusion Experiments at MIT, General Atomics...

  20. Fusiones y Adquisiciones en Mercados con Empresas Publicas y Privadas

    E-Print Network [OSTI]

    Coloma, Germán

    2006-01-01

    FUSIONES Y ADQUISICIONES EN MERCADOS CON EMPRESAS PÚBLICAS Yapreciación de posibles fusiones y adquisiciones entre laspública). Descriptores: Fusiones y adquisiciones, empresa

  1. Exploring a unique vision for heavy ion fusion

    E-Print Network [OSTI]

    Logan, B.G.

    2008-01-01

    rho-r T-lean targets Compact Fusion Advanced Rankine Cycleby Velikhov, the Compact Fusion Advanced Rankine cycleconversion, based on the Compact Fusion Advanced Rankine (

  2. Overview of US heavy-ion fusion progress and plans

    E-Print Network [OSTI]

    Logan, B.G.

    2010-01-01

    linac-driven inertial fusion energy and high energy densitytargets for inertial fusion energy (IFE) driven by inductionIBX and future inertial fusion energy drivers, current HIF-

  3. Fusion & Materials for Nuclear Systems Division | ornl.gov

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (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...

  4. ACCELERATOR & FUSION RESEARCH DIV. ANNUAL REPORT, OCT. 79 - SEPT. 80

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    Physics and Controlled Nuclear Fusion Research. Brussels,Physics and Controlled Nuclear Fusion Research, Brussels^Metals," submitted to Nuclear Fusion. H. D. I. Abarbanel, C.

  5. ION ACCELERATORS AS DRIVERS FOR INERTIAL CONFINEMENT FUSION

    E-Print Network [OSTI]

    Faltens, A.

    2010-01-01

    and Controlled Nuclear Fusion Research, Brussels, Belgium,of the Heavy Ion Fusion Workshop held at Brookhaven NationalReport, Hearthfire Heavy Ion Fusion, October 1, 1979 - March

  6. Fusion systems and biset functors via ghost algebras

    E-Print Network [OSTI]

    O'Hare, Shawn Michael

    2013-01-01

    2.2 Fusion Preserving1 Background 1.1 Fusion System Basics . . . . . . 1.2A. Craven. The theory of fusion systems. Vol. 131. Cambridge

  7. TRITIUM ACCOUNTANCY IN FUSION SYSTEMS

    SciTech Connect (OSTI)

    Klein, J. E.; Farmer, D. A.; Moore, M. L.; Tovo, L. L.; Poore, A. S.; Clark, E. A.; Harvel, C. D.

    2014-03-06

    The US Department of Energy (DOE) has clearly defined requirements for nuclear material control and accountability (MC&A) of tritium whereas the International Atomic Energy Agency (IAEA) does not since tritium is not a fissile material. MC&A requirements are expected for tritium fusion machines and will be dictated by the host country or regulatory body where the machine is operated. Material Balance Areas (MBAs) are defined to aid in the tracking and reporting of nuclear material movements and inventories. Material subaccounts (MSAs) are established along with key measurement points (KMPs) to further subdivide a MBA to localize and minimize uncertainties in the inventory difference (ID) calculations for tritium accountancy. Fusion systems try to minimize tritium inventory which may require continuous movement of material through the MSAs. The ability of making meaningful measurements of these material transfers is described in terms of establishing the MSA structure to perform and reconcile ID calculations. For fusion machines, changes to the traditional ID equation will be discussed which includes breading, burn-up, and retention of tritium in the fusion device. The concept of “net” tritium quantities consumed or lost in fusion devices is described in terms of inventory taking strategies and how it is used to track the accumulation of tritium in components or fusion machines.

  8. Systematic study of 16O-induced fusions with the improved quantum molecular dynamics model

    E-Print Network [OSTI]

    Ning Wang; Kai Zhao; Zhuxia Li

    2014-11-12

    The heavy-ion fusion reactions with 16O bombarding on 62Ni, 65Cu, 74Ge, 148Nd, 180Hf, 186W, 208Pb, 238U are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. The fusion cross sections at energies near and above the Coulomb barriers can be reasonably well reproduced by using this semi-classical microscopic transport model with the parameter sets SkP* and IQ3a. The dynamical nucleus-nucleus potentials and the influence of Fermi constraint on the fusion process are also studied simultaneously. In addition to the mean field, the Fermi constraint also plays a key role for the reliable description of fusion process and for improving the stability of fragments in heavy-ion collisions.

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

    E-Print Network [OSTI]

    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

    2011-06-10

    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.

  10. This work was supported by the U.S. DOE Office of Science under Grant No. DEFG02-88ER-40404 Romualdo deSouza, NKU, Jan. 21, 2015

    E-Print Network [OSTI]

    de Souza, Romualdo T.

    crust of an accreting neutron star #12;Motivation Fusion reactions in the outer crust result in X to heat the crust of neutron stars and allow 12C fusion, is the fusion of neutron-rich light nuclei (ex enriched with heavy elements Remnant core: Neutron star M>10Msun #12;· Fundamentals of supernova explosions

  11. Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System

    E-Print Network [OSTI]

    Kramer, Kevin James

    2010-01-01

    x NOMENCLATURE ICF Inertial Confinement Fusion IFE InertialJ.D. Lindl. Inertial Confinement Fusion. Springer-Verlag,for the laser inertial confinement Fusion-Fission energy (

  12. Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System

    E-Print Network [OSTI]

    Kramer, Kevin James

    2010-01-01

    of Con- trolled Nuclear Fusion, CONF-760975-P3, pages 1061–more effective solution, nuclear fusion. Fission Energy Thethe development of nuclear fusion weapons, humankind has

  13. Kinetic advantage of controlled intermediate nuclear fusion

    SciTech Connect (OSTI)

    Guo Xiaoming

    2012-09-26

    The dominated process of controlled fusion is to let nuclei gain enough kinetic energy to overcome Coulomb barrier. As a result, a fusion scheme can consider two factors in its design: to increase kinetic energy of nuclei and to alter the Coulomb barrier. Cold Fusion and Hot fusion are all one-factor schemes while Intermediate Fusion is a twofactors scheme. This made CINF kinetically superior. Cold Fusion reduces deuteron-deuteron distance, addressing Coulomb barrier, and Hot Fusion heat up plasma into extreme high temperature, addressing kinetic energy. Without enough kinetic energy made Cold Fusion skeptical. Extreme high temperature made Hot Fusion very difficult to engineer. Because CIFN addresses both factors, CIFN is a more promising technique to be industrialized.

  14. Conformal nets III: fusion of defects

    E-Print Network [OSTI]

    Arthur Bartels; Christopher L. Douglas; André Henriques

    2015-02-21

    Conformal nets provides a mathematical model for conformal field theory. We define a notion of defect between conformal nets, formalizing the idea of an interaction between two conformal field theories. We introduce an operation of fusion of defects, and prove that the fusion of two defects is again a defect, provided the fusion occurs over a conformal net of finite index. There is a notion of sector (or bimodule) between two defects, and operations of horizontal and vertical fusion of such sectors. Our most difficult technical result is that the horizontal fusion of the vacuum sectors of two defects is isomorphic to the vacuum sector of the fused defect. Equipped with this isomorphism, we construct the basic interchange isomorphism between the horizontal fusion of two vertical fusions and the vertical fusion of two horizontal fusions of sectors.

  15. Hindrance of Heavy-ion Fusion at Extreme Sub-Barrier Energies in Open-shell Colliding Systems

    E-Print Network [OSTI]

    C. L. Jiang; K. E. Rehm; H. Esbensen; R. V. F. Janssens; B. B. Back; P. Collon; C. N. Davids; J. P. Greene; D. J. Henderson; C. J. Lister; S. Kurtz; R. C. Pardo; T. Pennington; M. Paul; D. Peterson; D. Seweryniak; B. Shumard; S. Sinha; X. D. Tang; I. Tanihata; S. Zhu

    2004-12-20

    The excitation function for the fusion-evaporation reaction 64Ni+100Mo has been measured down to a cross-section of ~5 nb. Extensive coupled-channels calculations have been performed, which cannot reproduce the steep fall-off of the excitation function at extreme sub-barrier energies. Thus, this system exhibits a hindrance for fusion, a phenomenon that has been discovered only recently. In the S-factor representation introduced to quantify the hindrance, a maximum is observed at E_s=120.6 MeV, which corresponds to 90% of the reference energy E_s^ref, a value expected from systematics of closed-shell systems. A systematic analysis of Ni-induced fusion reactions leading to compound nuclei with mass A=100-200 is presented in order to explore a possible dependence of the fusion hindrance on nuclear structure.

  16. Strong plasma screening in thermonuclear reactions: Electron drop model

    E-Print Network [OSTI]

    P. A. Kravchuk; D. G. Yakovlev

    2014-01-11

    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.

  17. Annual Report of the EURATOM/CCFE Fusion Programme 2011/12 6 Materials

    E-Print Network [OSTI]

    materials, and for formulating guiding principles to aid the search and development of new candidate to the production of - particles (i.e. helium) in materials under high-energy neutron irradiation. A reactionAnnual Report of the EURATOM/CCFE Fusion Programme 2011/12 6 Materials 6.1 INTRODUCTION Developing

  18. Modeling nuclear fusion in dense plasmas using a cryogenic non-neutral plasmaa...

    E-Print Network [OSTI]

    California at San Diego, University of

    Modeling nuclear fusion in dense plasmas using a cryogenic non-neutral plasmaa... Daniel H. E the nuclear reaction rate in a dense neutral plasma and the energy equipartition rate in a strongly magnetized and at low temperatures, cyclotron energy, like nuclear energy, is released only through rare close

  19. SEARCH FOR CHARGED -PARTICLE d -d FUSION PRODUCTS IN AN ENCAPSULATED Pd THIN FILM

    E-Print Network [OSTI]

    Neuhauser, Barbara

    of activity in two nearby Geiger counters were observed with the film loaded to a nominal 150% deuterium-to-palladium the deuterated palladium film from being sputtered by the deuterium ion beam during the implantation for charged particle reaction products from d-d fusion in a deuterated palladium thin film. A silicon nitride

  20. Effects of nuclear structure on average angular momentum in subbarrier fusion

    E-Print Network [OSTI]

    A. B. Balantekin; J. R. Bennett; S. Kuyucak

    1994-07-21

    We investigate the effects of nuclear quadrupole and hexadecapole couplings on the average angular momentum in sub-barrier fusion reactions. This quantity could provide a probe for nuclear shapes, distinguishing between prolate vs. oblate quadrupole and positive vs. negative hexadecapole couplings. We describe the data in the O + Sm system and discuss heavier systems where shape effects become more pronounced.

  1. Fusion-fission hybrid studies in the United States

    SciTech Connect (OSTI)

    Moir, R.W.; Lee, J.D.; Berwald, D.H.; Cheng, E.T.; Delene, J.G.; Jassby, D.L.

    1986-05-20

    Systems and conceptual design studies have been carried out on the following three hybrid types: (1) The fission-suppressed hybrid, which maximizes fissile material produced (Pu or /sup 233/U) per unit of total nuclear power by suppressing the fission process and multiplying neutrons by (n,2n) reactions in materials like beryllium. (2) The fast-fission hybrid, which maximizes fissile material produced per unit of fusion power by maximizing fission of /sup 238/U (Pu is produced) in which twice the fissile atoms per unit of fusion power (but only a third per unit of nuclear power) are made. (3) The power hybrid, which amplifies power in the blanket for power production but does not produce fuel to sell. All three types must sell electrical power to be economical.

  2. Linear relaxation to planar Travelling Waves in Inertial Confinement Fusion

    E-Print Network [OSTI]

    Monsaingeon, Léonard

    2012-01-01

    We study linear stability of planar travelling waves for a scalar reaction-diffusion equation with non-linear anisotropic diffusion. The mathematical model is derived from the full thermo-hydrodynamical model describing the process of Inertial Confinement Fusion. We show that solutions of the Cauchy problem with physically relevant initial data become planar exponentially fast with rate $s(\\eps',k)>0$, where $\\eps'=\\frac{T_{min}}{T_{max}}\\ll 1$ is a small temperature ratio and $k\\gg 1$ the transversal wrinkling wavenumber of perturbations. We rigorously recover in some particular limit $(\\eps',k)\\rightarrow (0,+\\infty)$ a dispersion relation $s(\\eps',k)\\sim \\gamma_0 k^{\\alpha}$ previously computed heuristically and numerically in some physical models of Inertial Confinement Fusion.

  3. US ITER | Why Fusion?

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail.Theory ofDidDevelopmentat LENA| ReactionSite Map SiteUS ITER Jobs ABOUTBuilding

  4. Laser induced chemical reactions

    E-Print Network [OSTI]

    Orel, Ann E.

    2010-01-01

    the simplest prototype chemical reaction, and since it is soLASER ENHANCEMENT OF CHEMICAL REACTIONS A. B. C. D. E.Laser Inhibition of Chemical Reaction Effect of Isotopic

  5. FUSION CROSS-SECTIONS AND THE NEW DYNAMICS

    E-Print Network [OSTI]

    Swiatecki, W.J.

    2010-01-01

    and achieve fusion. Nuclear Fusion according to the Newautomatically toward fusion by the cohesive nuclear forces.FUSION CROSS-SECTIONS AND THE NEW WNAM1CS H.J. Swlateckl Nuclear

  6. ACCELERATOR & FUSION RESEARCH DIV. ANNUAL REPORT, OCT. 80 - SEPT. 81

    E-Print Network [OSTI]

    Johnson Ed, R.K.

    2010-01-01

    were derived from a MAGNETIC FUSION ENERGY STAFF W, Kunkel (H. 1. F. Staff, Heavy Ion Fusion Half-year Report October 1,LBL-12594 (1981). Heavy Ion Fusion Staff, Heavy Ion Fusion

  7. Inertial fusion program. Progress report, July 1-December 31, 1978

    SciTech Connect (OSTI)

    Perkins, R.B.

    1980-11-01

    Progress at Los Alamos Scientific Laboratory (LASL) in the development of high-energy short-pulse CO/sub 2/ laser systems for fusion research is reported. Improvements to LASL's two-beam system, Gemini, are outlined and experimental results are discussed. Our eight-beam system, Helios, was fired successfully on target for the first time, and became the world's most powerful gas laser for laser fusion studies. Work on Antares, our 100- to 200-TW target irradiation system, is summarized, indicating that design work and building construction are 70 and 48% complete, respectively. A baseline design for automatic centering of laser beams onto the various relay mirrors and the optical design of the Antares front end are discussed. The results of various fusion reactor studies are summarized, as well as investigations of synthetic-fuel production through application of fusion energy to hydrogen production by thermochemical water splitting. Studies on increased efficiency of energy extraction in CO/sub 2/ lasers and on lifetimes of cryogenic pellets in a reactor environment are summarized, as well as the results of studies on pellet injection, tracking, and beam synchronization.

  8. How NIF Works

    ScienceCinema (OSTI)

    None

    2010-09-01

    The National Ignition Facility, located at Lawrence Livermore National Laboratory, is the world's largest laser system... 192 huge laser beams in a massive building, all focused down at the last moment at a 2 millimeter ball containing frozen hydrogen gas. The goal is to achieve fusion... getting more energy out than was used to create it. It's never been done before under controlled conditions, just in nuclear weapons and in stars. We expect to do it within the next 2-3 years. The purpose is threefold: to create an almost limitless supply of safe, carbon-free, proliferation-free electricity; examine new regimes of astrophysics as well as basic science; and study the inner-workings of the U.S. stockpile of nuclear weapons to ensure they remain safe, secure and reliable without the need for underground testing. More information about NIF can be found at:

  9. Ignition and Inertial Confinement Fusion at The National Ignition Facility

    SciTech Connect (OSTI)

    Moses, E

    2009-10-01

    The National Ignition Facility (NIF), the world's largest and most powerful laser system for inertial confinement fusion (ICF) and for studying high-energy-density (HED) science, is now operational at Lawrence Livermore National Laboratory (LLNL). The NIF is now conducting experiments to commission the laser drive, the hohlraum and the capsule and to develop the infrastructure needed to begin the first ignition experiments in FY 2010. Demonstration of ignition and thermonuclear burn in the laboratory is a major NIF goal. NIF will achieve this by concentrating the energy from the 192 beams into a mm{sup 3}-sized target and igniting a deuterium-tritium mix, liberating more energy than is required to initiate the fusion reaction. NIF's ignition program is a national effort managed via the National Ignition Campaign (NIC). The NIC has two major goals: execution of DT ignition experiments starting in FY2010 with the goal of demonstrating ignition and a reliable, repeatable ignition platform by the conclusion of the NIC at the end of FY2012. The NIC will also develop the infrastructure and the processes required to operate NIF as a national user facility. The achievement of ignition at NIF will demonstrate the scientific feasibility of ICF and focus worldwide attention on laser fusion as a viable energy option. A laser fusion-based energy concept that builds on NIF, known as LIFE (Laser Inertial Fusion Energy), is currently under development. LIFE is inherently safe and can provide a global carbon-free energy generation solution in the 21st century. This paper describes recent progress on NIF, NIC, and the LIFE concept.

  10. On Thermonuclear Reaction Rates

    E-Print Network [OSTI]

    H. J. Haubold; A. M. Mathai

    1996-12-02

    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.

  11. INERTIAL FUSION DRIVEN BY INTENSE HEAVY-ION BEAMS

    E-Print Network [OSTI]

    Sharp, W. M.

    2011-01-01

    confinement fusion (ICF) to the more-familiar magnetic-fusion have opposite strategies for meeting this criterion. Magnetic confinement

  12. Homodyne target tracking for direct drive laser inertial fusion

    E-Print Network [OSTI]

    Spalding, Jon David

    2009-01-01

    direct drive inertial confinement fusion experiments, asto be used in >>>Inertial Confinement Fusion, as a means of

  13. Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System

    E-Print Network [OSTI]

    Kramer, Kevin James

    2010-01-01

    1.1.3.2 Fusion Energy . . . . . . . . . 1.1.3.3 Fission-aspects of magnetic fusion energy, September 1989. 1.1.3.2 [based on laser inertial fusion energy (LIFE). Fusion Science

  14. A Plan for the Development of Fusion Energy. Final Report to Fusion Energy Sciences Advisory Committee, Fusion Development Path Panel

    SciTech Connect (OSTI)

    None, None

    2003-03-05

    This report presents a plan for the deployment of a fusion demonstration power plant within 35 years, leading to commercial application of fusion energy by mid-century. The plan is derived from the necessary features of a demonstration fusion power plant and from the time scale defined by President Bush. It identifies critical milestones, key decision points, needed major facilities and required budgets.

  15. Laser fusion experiments at LLL

    SciTech Connect (OSTI)

    Ahlstrom, H.G.

    1980-06-16

    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.

  16. Generic magnetic fusion reactor cost assessment

    SciTech Connect (OSTI)

    Sheffield, J.

    1984-01-01

    A generic D-T burning magnetic fusion reactor model shows that within the constraints set by generic limitations it is possible for magnetic fusion to be a competitive source of electricity in the 21st century.

  17. Science/Fusion Energy Sciences FY 2007 Congressional Budget Fusion Energy Sciences

    E-Print Network [OSTI]

    Science/Fusion Energy Sciences FY 2007 Congressional Budget Fusion Energy Sciences Funding Profile Adjustments FY 2006 Current Appropriation FY 2007 Request Fusion Energy Sciences Science,182 Total, Fusion Energy Sciences........... 266,947b 290,550 -2,906 287,644 318,950 Public Law

  18. Science/Fusion Energy Sciences FY 2011 Congressional Budget Fusion Energy Sciences

    E-Print Network [OSTI]

    Science/Fusion Energy Sciences FY 2011 Congressional Budget Fusion Energy Sciences Funding Profile FY 2010 Current Appropriation FY 2011 Request Fusion Energy Sciences Science 163,479 +57,399 182, Fusion Energy Sciences 394,518b +91,023 426,000 380,000 Public Law Authorizations: Public Law 95

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

    E-Print Network [OSTI]

    Nagle, John F.

    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

  20. From Data Fusion to Knowledge Fusion Xin Luna Dong, Evgeniy Gabrilovich, Geremy Heitz, Wiko Horn,

    E-Print Network [OSTI]

    Murphy, Kevin Patrick

    From Data Fusion to Knowledge Fusion Xin Luna Dong, Evgeniy Gabrilovich, Geremy Heitz, Wiko Horn|gabr|geremy|wilko|kpmurphy|sunsh|weizh}@google.com ABSTRACT The task of data fusion is to identify the true values of data items (e.g., the true date of birth (and unknown) reliabil- ity. A recent survey [20] has provided a detailed comparison of various fusion

  1. THE NATIONAL FUSION COLLABORATORY PROJECT: APPLYING GRID TECHNOLOGY FOR MAGNETIC FUSION RESEARCH

    E-Print Network [OSTI]

    Thompson, Mary R.

    THE NATIONAL FUSION COLLABORATORY PROJECT: APPLYING GRID TECHNOLOGY FOR MAGNETIC FUSION RESEARCH D Diego, California 92186-5608 email: schissel@fusion.gat.com, Phone: (858) 455-3387, Fax: (858) 455- 4156, Berkeley, California 04720 The overall goal of the DOE SciDAC funded U.S. National Fusion Collaboratory

  2. Inside ITER seminar on History of Fusion Page 1 History of Fusion

    E-Print Network [OSTI]

    Union thermonuclear explosion 400kT #12;Inside ITER seminar on History of Fusion Page 4 Big IvanInside ITER seminar on History of Fusion Page 1 History of Fusion Personal view V. Chuyanov 9 July 2009 Special thanks to ITER Communication Division. #12;Inside ITER seminar on History of Fusion Page 2

  3. 2002 Summer Fusion Study 1 July 19, 2002 2002 Fusion Summer Study

    E-Print Network [OSTI]

    fuel, or plasma, is strongly self-heated by fusion energy as in the sun and stars. An integrated, 2002 For Immediate Release Fusion energy shows great promise to contribute to securing the energy the major next steps in fusion energy science research. The development of practical fusion power is one

  4. Fusion Nuclear Science and Technology (FNST)Fusion Nuclear Science and Technology (FNST) Challenges and Facilities

    E-Print Network [OSTI]

    California at Los Angeles, University of

    Fusion Nuclear Science and Technology (FNST)Fusion Nuclear Science and Technology (FNST) Challenges on MFE Roadmapping in the ITER Era Princeton, NJ 7-10 September 2011 1 #12;Fusion Nuclear Science never done any experiments on FNST in a real fusion nuclear environment we must be realistic on what

  5. Report ofReport of Nuclear Fusion Section,Nuclear Fusion Section,

    E-Print Network [OSTI]

    Report ofReport of Nuclear Fusion Section,Nuclear Fusion Section, National Committee for NuclearJapan Atomic Energy Research Institute On the New Way of Nuclear Fusion ResearchOn the New Way of Nuclear on the new way of developing nuclear fusion under the new circumstances (chair: Prof. A. Koyama) under

  6. Fusion rules for the logarithmic $N=1$ superconformal minimal models I: the Neveu-Schwarz sector

    E-Print Network [OSTI]

    Michael Canagasabey; Jorgen Rasmussen; David Ridout

    2015-04-13

    It is now well known that non-local observables in critical statistical lattice models, polymers and percolation for example, may be modelled in the continuum scaling limit by logarithmic conformal field theories. Fusion rules for such theories, sometimes referred to as logarithmic minimal models, have been intensively studied over the last ten years in order to explore the representation-theoretic structures relevant to non-local observables. Motivated by recent lattice conjectures, this work studies the fusion rules of the $N=1$ supersymmetric analogues of these logarithmic minimal models in the Neveu-Schwarz sector. Fusion rules involving Ramond representations will be addressed in a sequel.

  7. Fusion rules for the logarithmic $N=1$ superconformal minimal models I: the Neveu-Schwarz sector

    E-Print Network [OSTI]

    Michael Canagasabey; Jorgen Rasmussen; David Ridout

    2015-08-30

    It is now well known that non-local observables in critical statistical lattice models, polymers and percolation for example, may be modelled in the continuum scaling limit by logarithmic conformal field theories. Fusion rules for such theories, sometimes referred to as logarithmic minimal models, have been intensively studied over the last ten years in order to explore the representation-theoretic structures relevant to non-local observables. Motivated by recent lattice conjectures, this work studies the fusion rules of the $N=1$ supersymmetric analogues of these logarithmic minimal models in the Neveu-Schwarz sector. Fusion rules involving Ramond representations will be addressed in a sequel.

  8. 1994 International Sherwood Fusion Theory Conference

    SciTech Connect (OSTI)

    1994-04-01

    This report contains the abstracts of the paper presented at the 1994 International Sherwood Fusion Theory Conference.

  9. Breakthrough: Neutron Science for the Fusion Mission

    ScienceCinema (OSTI)

    McGreevy, Robert

    2014-06-03

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

  10. FUSION POWER PLANTS GOALS AND TECHNOLOGICAL CHALLENGES

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    -disposal, and air pollution, etc.) can be realized. These advantages of fusion will not, however, be achieved

  11. Exo-endo cellulase fusion protein

    DOE Patents [OSTI]

    Bower, Benjamin S. (Palo Alto, CA); Larenas, Edmund A. (Palo Alto, CA); Mitchinson, Colin (Palo Alto, CA)

    2012-01-17

    The present invention relates to a heterologous exo-endo cellulase fusion construct, which encodes a fusion protein having cellulolytic activity comprising a catalytic domain derived from a fungal exo-cellobiohydrolase and a catalytic domain derived from an endoglucanase. The invention also relates to vectors and fungal host cells comprising the heterologous exo-endo cellulase fusion construct as well as methods for producing a cellulase fusion protein and enzymatic cellulase compositions.

  12. Breakthrough: Neutron Science for the Fusion Mission

    SciTech Connect (OSTI)

    McGreevy, Robert

    2012-04-24

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

  13. Polynomial Fusion Rings of Logarithmic Minimal Models

    E-Print Network [OSTI]

    Jorgen Rasmussen; Paul A. Pearce

    2007-09-21

    We identify quotient polynomial rings isomorphic to the recently found fundamental fusion algebras of logarithmic minimal models.

  14. Institute of Plasma and Fusion Research

    E-Print Network [OSTI]

    t Institute of Plasma and Fusion Research FUSION ENERGY ADVISORY COMMITTEE Advice I V E R S I T Y O F C A L I F O R N I A L O S A N G E L E S #12;FUSION ENERGY ADVISORY COMMITTEE Of September24, 1991: Part B UCLA PPG #1408 March 12,1992 i #12;FUSION ENERGY ADVISORY COMMITTEE Advice

  15. Fusion bonding and alignment fixture

    DOE Patents [OSTI]

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

    2000-01-01

    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.

  16. Method for vacuum fusion bonding

    DOE Patents [OSTI]

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

    2001-01-01

    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.

  17. Laser fusion monthly, February 1981

    SciTech Connect (OSTI)

    Ahlstrom, H.G.

    1981-02-01

    This report is divided into the following sections: (1) facility reports (Argus and Shiva); (2) Nova project; and (3) fusion experiments. In the Fusion Experiments section of this report, the author describes the results of a series of experiments on Shiva which further the understanding of the production and transport of suprathermal electrons. He found that of the suprathermal electrons which strike a laser irradiated disk target or which interact with the rear surface of a half Cairn hohlraum target, a significant fraction of these electrons orbit the target and strike the rear of the disk. These results have significant implications in the interpretation and modeling of the laser irradiated target experiments.

  18. Fusion project decision delayed ITER -NUCLEAR FUSION PROJECT

    E-Print Network [OSTI]

    before a commercial reactor is built A decision on where to site the world's first big nuclear fusion-free energy - but the reactor will take 10 years to build. Pros and cons Member countries of the International research facility and a more moderate climate. Iter consortium European Union United States Russia China

  19. Research Needs Workshop for Magnetic Fusion Energy

    E-Print Network [OSTI]

    ReNeW Research Needs Workshop for Magnetic Fusion Energy June 7-13, 2009 Richard Hazeltine, ReNeW for Magnetic Fusion Energy Sciences Report of the Research Needs Workshop (ReNeW) Bethesda, Maryland ­ June 8-12, 2009 OFFICE OF FUSION ENERGY SCIENCES Wednesday, November 25, 2009 #12;Acknowledgements ReNeW

  20. Fusion Energy: Visions of the Future

    E-Print Network [OSTI]

    energy conversion Direct energy conversion No $$$ turbines Why Is Aneutronic Fusion Cheap? #12;Dense Star Formation REPRODUCING NATURAL INSTABILITIES Solar Flares #12;Energy (X-rays, Ion Beams) CaptureFusion Energy: Visions of the Future Dec. 10-11, 2013 FOCUS FUSION Cheap, Clean, Safe & Unlimited

  1. Automated geographic information fusion and ontology alignment

    E-Print Network [OSTI]

    Duckham, Matt

    geographic information fusion system is semantic heterogeneity, where the concepts and categories usedAutomated geographic information fusion and ontology alignment Matt Duckham1 and Mike Worboys2 1@spatial.maine.edu 1 Introduction Geographic information fusion is the process of integrating geographic infor- mation

  2. 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

  3. MAST-Upgrade Advancing compact fusion sources

    E-Print Network [OSTI]

    MAST-Upgrade Advancing compact fusion sources #12;#12;The Mega Amp Spherical Tokamak (MAST) is the centrepiece of the UK's fusion research programme. It has led studies into the spherical tokamak, a compact to the drive towards commercial fusion power. 1. Testing reactor concepts. MAST-Upgrade will be the first

  4. Compact Fusion Catherine Hope and Graham Hutton

    E-Print Network [OSTI]

    Hutton, Graham

    Compact Fusion Catherine Hope and Graham Hutton School of Computer Science and IT, University;Compact Fusion unfold :: (a Bool) (a b) (a a) a [b] unfold p hd tl = f where f x = if p x and collapses it in some way. The space efficiency of this composition may be improved by applying fusion

  5. COMMENTARIES ON CRITICISMS OF MAGNETIC FUSION

    E-Print Network [OSTI]

    issue of Science. p14 VII. Commentary on "Complexity and Availability for Fusion Power Plants", J of Technology Review. p5 1V. Commentary on "Insurmountable Engineering Problems Seen as Ruling Out `Fusion Power is probably greater than the energy content of fossil or uranium fuels, and the fusion fuel is virtually

  6. the fusion trend line Stan Milora (ORNL)

    E-Print Network [OSTI]

    ­materials and fusion nuclear science and technology ReNeW findings VLT Virtual Laboratory for Technology://vlt.ornl.gov/ VLT Virtual Laboratory for Technology For Fusion Energy Science #12;2 Managed by UT-Battelle for the U: Greenwald report on Priorities, Gaps and Opportunities identifies glaring gaps in materials, fusion nuclear

  7. EURATOM/CCFE Fusion Association Annual Report

    E-Print Network [OSTI]

    . 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 no greenhouse gases that from today's fission nuclear power stations. In Europe, fusion research is co-ordinated by EURATOM

  8. Krypton Fluoride Laser Driven Inertial Fusion Energy

    E-Print Network [OSTI]

    for Inertial Confinement Fusion Energy Systems San Ramon CA January 29, 2011 presented by John Sethian1 Krypton Fluoride Laser Driven Inertial Fusion Energy Presented to NAS Committee on the Prospects POWER PLANT: Attractive Technology #12;6 Outline S. ObenschainVision of R&D path to Inertial Fusion

  9. Introduction to Magnetic Thermonuclear Fusion and

    E-Print Network [OSTI]

    Shihadeh, Alan

    Introduction to Magnetic Thermonuclear Fusion and Related Research Projects Ghassan Antar Fusion 2. Research on Turbulence (Theory and Experiment) 3. Research on Disruptions 4. Research on Plasma Facing Components #12;Ghassan Y. ANTAR 3 Fusion Occurs when Two Nuclei Unite to Form One The Energy

  10. Exotic fusion systems over 2-groups

    E-Print Network [OSTI]

    Thévenaz, Jacques

    Exotic 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 GFS(G)(P, Q) = HomG(P, Q). 1 #12;The notion of an abstract fusion system is due to Puig. The definitions we

  11. Fusion in a Staged Z-pinch

    E-Print Network [OSTI]

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

    2009-01-01

    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,

  12. Image Fusion: Principles, Methods, and Applications

    E-Print Network [OSTI]

    Sroubek, Filip

    Image Fusion: Principles, Methods, and Applications Tutorial EUSIPCO 2007 Lecture Notes Jan Flusser,sroubekf,zitova}@utia.cas.cz #12;Introduction The term fusion means in general an approach to extraction of information acquired in several domains. The goal of image fusion (IF) is to integrate complementary multisensor, multitemporal

  13. Experience with PowerPlex Fusion

    E-Print Network [OSTI]

    Experience with PowerPlex Fusion Jeffrey Nye Michigan State Police ISHI Workshop on New Loci 3500s being established · Offender database of 300,000+ include Penta loci PowerPlex Fusion #12;Fortunate to be able to use actual casework samples More than 40 cases have been analyzed with Fusion- only

  14. *****I* ****f?* Fusion Programme Evaluation Board

    E-Print Network [OSTI]

    of the Community's programme in the field of Controlled Thermonuclear Fusion; to appraise the environmental, safety*****I* ****f?* Report of the Fusion Programme Evaluation Board prepared for the Commission . . . . . . . . . . . . 11 CHAPTER ONE: NUCLEAR FUSION AND ITS POTENTIAL CONTRIBUTION TO THE WORLD'S ENERGY NEEDS 1

  15. Fusion Development Path Panel Preliminary Report

    E-Print Network [OSTI]

    demonstration devices will be built around the world. In order for a future US fusion industry to be competitive facilities around the world, and include both magnetic fusion energy (MFE) and inertial fusion energy (IFE Laboratory, New Mexico · Stewart Prager, University of Wisconsin · Ned Sauthoff, Princeton Plasma Physics

  16. Linear Momentum and Angular-Momentum Transfer in the Reactions of O-16 with Sm-154 

    E-Print Network [OSTI]

    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.

    1987-01-01

    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...

  17. SUPPORT FUSION ENERGY SCIENCES IN FY 2013 HELP THE UNITED STATES REMAIN A WORLD LEADER IN FUSION RESEARCH

    E-Print Network [OSTI]

    ON THE U.S. FUSION PROGRAM Fusion energy is the power source of our sun and the stars. ItsSUPPORT FUSION ENERGY SCIENCES IN FY 2013 HELP THE UNITED STATES REMAIN A WORLD LEADER IN FUSION fusion researchers, and prepare for the commercialization of fusion energy, the U.S. must have its own

  18. Dynamical approach to heavy-ion induced fusion using actinide target

    SciTech Connect (OSTI)

    Aritomo, Y.; Hagino, K.; Chiba, S.; Nishio, K.

    2012-10-20

    To treat heavy-ion reactions using actinide target nucleus, we propose a model which takes into account the coupling to the collective states of interacting nuclei in the penetration of the Coulomb barrier and the dynamical evolution of nuclear shape from the contact configuration. A fluctuation-dissipation model (Langevin equation) was applied in the dynamical calculation, where effect of nuclear orientation at the initial impact on the prolately deformed target nucleus was considered. Using this model, we analyzed the experimental data for the mass distribution of fission fragments (MDFF) in the reaction of {sup 36}S+{sup 238}U at several incident energies. Fusion-fission, quasifission and deep-quasi-fission are separated as different trajectories on the potential energy surface. We estimated the fusion cross section of the reaction.

  19. Nuclear reactions with 11C and 14O radioactive ion beams

    SciTech Connect (OSTI)

    Guo, Fanqing

    2004-12-09

    Radioactive ion beams (RIBs) have been shown to be a useful tool for studying proton-rich nuclides near and beyond the proton dripline and for evaluating nuclear models. To take full advantage of RIBs, Elastic Resonance Scattering in Inverse Kinematics with Thick Targets (ERSIKTT), has proven to be a reliable experimental tool for investigations of proton unbound nuclei. Following several years of effort, Berkeley Experiments with Accelerated Radioactive Species (BEARS), a RIBs capability, has been developed at the Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. The current BEARS provides two RIBs: a 11C beam of up to 2x108 pps intensity on target and an 14O beam of up to 3x104 pps intensity. While the development of the 11C beam has been relatively easy, a number of challenges had to be overcome to obtain the 14O beam. The excellent 11C beam has been used to investigate several reactions. The first was the 197Au(11C,xn)208-xnAt reaction, which was used to measure excitation functions for the 4n to 8n exit channels. The measured cross sections were generally predicted quite well using the fusion-evaporation code HIVAP. Possible errors in the branching ratios of ?? decays from At isotopes as well as the presence of incomplete fusion reactions probably contribute to specific overpredictions. 15F has been investigated by the p(14O,p)14O reaction with the ERSIKTT technology. Several 14O+p runs have been performed. Excellent energy calibration was obtained using resonances from the p(14N,p)14N reaction in inverse kinematics, and comparing the results to those obtained earlier with normal kinematics. The differences between 14N+p and 14O+p in the stopping power function have been evaluated for better energy calibration. After careful calibration, the energy levels of 15F were fitted with an R-matrix calculation. Spins and parities were assigned to the two observed resonances. This new measurement of the 15F ground state supports the disappearance of the Z = 8 proton magic number for odd Z, Tz=-3/2 nuclei. It is expected that future work on proton-rich nuclides will rely heavily on RIBs and/or mass separators. Currently, radioactive ion beam intensities are sufficient for the study of a reasonable number of very proton-rich nuclides.

  20. MRI/TRUS data fusion for brachytherapy

    E-Print Network [OSTI]

    Daanen, V; Giraud, J Y; Fourneret, P; Descotes, J L; Bolla, M; Collomb, D; Troccaz, Jocelyne

    2006-01-01

    BACKGROUND: Prostate brachytherapy consists in placing radioactive seeds for tumour destruction under transrectal ultrasound imaging (TRUS) control. It requires prostate delineation from the images for dose planning. Because ultrasound imaging is patient- and operator-dependent, we have proposed to fuse MRI data to TRUS data to make image processing more reliable. The technical accuracy of this approach has already been evaluated. METHODS: We present work in progress concerning the evaluation of the approach from the dosimetry viewpoint. The objective is to determine what impact this system may have on the treatment of the patient. Dose planning is performed from initial TRUS prostate contours and evaluated on contours modified by data fusion. RESULTS: For the eight patients included, we demonstrate that TRUS prostate volume is most often underestimated and that dose is overestimated in a correlated way. However, dose constraints are still verified for those eight patients. CONCLUSIONS: This confirms our init...