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Title: Improving ICF implosion performance with alternative capsule supports

Authors:
 [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1] more »; ORCiD logo [1];  [1];  [2];  [1];  [2];  [1] « less
  1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  2. General Atomics, San Diego, California 92121, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1348030
Alternate Identifier(s):
OSTI ID: 1349371
Grant/Contract Number:
AC52-07NA27344; NA0001808
Resource Type:
Journal Article: Published Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-03-24 13:13:40; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Weber, C. R., Casey, D. T., Clark, D. S., Hammel, B. A., MacPhee, A., Milovich, J., Martinez, D., Robey, H. F., Smalyuk, V. A., Stadermann, M., Amendt, P., Bhandarkar, S., Chang, B., Choate, C., Crippen, J., Felker, S. J., Field, J. E., Haan, S. W., Johnson, S., Kroll, J. J., Landen, O. L., Marinak, M., Mcinnis, M., Nikroo, A., Rice, N., and Sepke, S. M. Improving ICF implosion performance with alternative capsule supports. United States: N. p., 2017. Web. doi:10.1063/1.4977536.
Weber, C. R., Casey, D. T., Clark, D. S., Hammel, B. A., MacPhee, A., Milovich, J., Martinez, D., Robey, H. F., Smalyuk, V. A., Stadermann, M., Amendt, P., Bhandarkar, S., Chang, B., Choate, C., Crippen, J., Felker, S. J., Field, J. E., Haan, S. W., Johnson, S., Kroll, J. J., Landen, O. L., Marinak, M., Mcinnis, M., Nikroo, A., Rice, N., & Sepke, S. M. Improving ICF implosion performance with alternative capsule supports. United States. doi:10.1063/1.4977536.
Weber, C. R., Casey, D. T., Clark, D. S., Hammel, B. A., MacPhee, A., Milovich, J., Martinez, D., Robey, H. F., Smalyuk, V. A., Stadermann, M., Amendt, P., Bhandarkar, S., Chang, B., Choate, C., Crippen, J., Felker, S. J., Field, J. E., Haan, S. W., Johnson, S., Kroll, J. J., Landen, O. L., Marinak, M., Mcinnis, M., Nikroo, A., Rice, N., and Sepke, S. M. Tue . "Improving ICF implosion performance with alternative capsule supports". United States. doi:10.1063/1.4977536.
@article{osti_1348030,
title = {Improving ICF implosion performance with alternative capsule supports},
author = {Weber, C. R. and Casey, D. T. and Clark, D. S. and Hammel, B. A. and MacPhee, A. and Milovich, J. and Martinez, D. and Robey, H. F. and Smalyuk, V. A. and Stadermann, M. and Amendt, P. and Bhandarkar, S. and Chang, B. and Choate, C. and Crippen, J. and Felker, S. J. and Field, J. E. and Haan, S. W. and Johnson, S. and Kroll, J. J. and Landen, O. L. and Marinak, M. and Mcinnis, M. and Nikroo, A. and Rice, N. and Sepke, S. M.},
abstractNote = {},
doi = {10.1063/1.4977536},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Tue Feb 28 00:00:00 EST 2017},
month = {Tue Feb 28 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4977536

Citation Metrics:
Cited by: 5works
Citation information provided by
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  • Cited by 5
  • Low-mode asymmetries in the laser-indirect-drive inertial confinement fusion implosion experiments conducted on the National Ignition Facility [G. H. Miller et al., Nucl. Fusion 44, S228 (2004)] are deemed the main obstacles hindering further improvement of the nuclear performance of deuterium-tritium-layered capsules. The dominant seeds of these asymmetries include the P2 and P4 asymmetries of x-ray drives and P2 asymmetry introduced by the supporting “tent.” Here, we explore the effects of another possible seed that can lead to low-mode asymmetric implosions, i.e., the M-band flux asymmetry (MFA) in laser-driven cylindrical gold Hohlraums. It is shown that the M-band flux facilitates themore » ablation and acceleration of the shell, and that positive P2 MFAs can result in negative P2 asymmetries of hot spots and positive P2 asymmetries of shell's ρR. An oblate or toroidal hot spot, depending on the P2 amplitude of MFA, forms at stagnation. The energy loss of such a hot spot via electron thermal conduction is seriously aggravated not only due to the enlarged hot spot surface but also due to the vortices that develop and help transferring thermal energy from the hotter center to the colder margin of such a hot spot. The cliffs of nuclear performance for the two methodologies of applying MFA (i.e., symmetric flux in the presence of MFA and MFA added for symmetric soft x-ray flux) are obtained locating at 9.5% and 5.0% of P2/P0 amplitudes, respectively.« less
  • The paper investigates theoretically the sensitivities of ignition capsule implosion performance on the hard x-ray spectral distribution of hohlraum. In the simulation, the hohlraum radiation is represented by a Planckian spectrum for the main drive plus a gaussian bump centered at energy E{sub c} for preheating x-rays. Simulation results show that with the increasing of center energy E{sub c}, the Atwood number at the fuel-ablator interface increases rapidly due to the preheating and expanding of the inner undoped CH layer. The growing of Atwood number indicates the hydrodynamic instability (HI) growth and mixing at this interface. On the other hand,more » the increasing of E{sub c} results in a large density gradient scale length of ablation front and stabilizes the HI growth at ablation front. The changes of the hard x-ray spectrum have significant influences on other important implosion parameters including the ablator mass remaining, shock timing, implosion velocity, and yield as well. High-precision results on the hard x-ray spectral distribution of hohlraum are thus critical for optimizing the ignition capsule design to limit the HI growth.« less
  • A flexible direct-drive target platform is used to implode cryogenic deuterium–tritium (DT) capsules on the OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)]. The goal of these experiments is to demonstrate ignition hydrodynamically equivalent performance where the laser drive intensity, the implosion velocity, the fuel adiabat, and the in-flight aspect ratio (IFAR) are the same as those for a 1.5-MJ target [Goncharov et al., Phys. Rev. Lett. 104, 165001 (2010)] designed to ignite on the National Ignition Facility [Hogan et al., Nucl. Fusion 41, 567 (2001)]. The results from a series of 29 cryogenic DT implosions are presented.more » The implosions were designed to span a broad region of design space to study target performance as a function of shell stability (adiabat) and implosion velocity. Ablation-front perturbation growth appears to limit target performance at high implosion velocities. Target outer-surface defects associated with contaminant gases in the DT fuel are identified as the dominant perturbation source at the ablation surface; performance degradation is confirmed by 2D hydrodynamic simulations that include these defects. A trend in the value of the Lawson criterion [Betti et al., Phys. Plasmas 17, 058102 (2010)] for each of the implosions in adiabat–IFAR space suggests the existence of a stability boundary that leads to ablator mixing into the hot spot for the most ignition-equivalent designs.« less