Ion-kinetic simulations of D-3He gas-filled inertial confinement fusion target implosions with moderate to large Knudsen number

Larroche, O.; Rinderknecht, H. G.; Rosenberg, M. J.; Hoffman, N. M.; Atzeni, S.; Petrasso, R. D.; Amendt, P. A.; Seguin, F. H.

doi:10.1063/1.4939025

Title: Ion-kinetic simulations of D-³He gas-filled inertial confinement fusion target implosions with moderate to large Knudsen number

Journal Article · Wed Jan 06 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4939025· OSTI ID:1281685

Larroche, O. ^[1]; Rinderknecht, H. G. ^[2]; Rosenberg, M. J. ^[3]; Hoffman, N. M. ^[4]; Atzeni, S. ^[5]; Petrasso, R. D. ^[6]; Amendt, P. A. ^[2]; Seguin, F. H. ^[6]

CEA DIF, Arpajon Cedex (France)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, Rochester, NY (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. di Roma "La Sapienza" and CNISM, Roma (Italy)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Experiments designed to investigate the transition to non-collisional behavior in D³He-gas inertial confinement fusion target implosions display increasingly large discrepancies with respect to simulations by standard hydrodynamics codes as the expected ion mean-free-paths λ_c increase with respect to the target radius R (i.e., when the Knudsen number N_K = λ_c/R grows). To take properly into account large N_K's, multi-ion-species Vlasov-Fokker-Planck computations of the inner gas in the capsules have been performed, for two different values of N_K, one moderate and one large. The results, including nuclear yield, reactivity-weighted ion temperatures, nuclear emissivities, and surface brightness, have been compared with the experimental data and with the results of hydrodynamical simulations, some of which include an ad hocmodeling of kinetic effects. The experimental results are quite accurately rendered by the kinetic calculations in the smaller-N_K case, much better than by the hydrodynamical calculations. The kinetic effects at play in this case are thus correctly understood. However, in the higher-N_K case, the agreement is much worse. Furthermore, the remaining discrepancies are shown to arise from kinetic phenomena (e.g., inter-species diffusion) occurring at the gas-pusher interface, which should be investigated in the future work.

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Research Organization:: Lawrence Livermore National Lab., Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1281685

Report Number(s):: LLNL-JRNL-696097

Journal Information:: Physics of Plasmas, Vol. 23, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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