Kinetic effects on the electron thermal transport in ignition target design

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871592· OSTI ID:286961

Honda, M ^[1]; Nishiguchi, A ^[2]; Takabe, H; Azechi, H; Mima, K ^[1]

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1. Institute of Laser Engineering, Osaka University, Suita, Osaka, 565 (Japan)
2. Osaka Institute of Technology, Asahi-ku, Osaka, 535 (Japan)

Preheating is one of the most critical issues in laser fusion, because of significant reduction of volume compression. The nonlocal heat transport in an ablative plasma is found to play an important role in the preheating under high intensity laser irradiation. Namely, the electron heat transport should be described by the Fokker{endash}Planck (FP) equation in the fluid implosion code. The Spitzer{endash}H{umlt a}rm (SH) thermal conduction model is not applicable because the electron mean free path is comparable to the temperature scale length. The numerical simulations of the implosion with the FP heat transport have been carried out for the fast (high entropy) implosion mode in which the implosion velocity reaches as high as 6{times}10{sup 7} cm/s. In the fast implosion, the required laser energy for ignition can be reduced. It is found in the simulation that the isentrope in the FP simulation code is higher by two to four times than that in the flux limited SH simulation. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 286961
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
FOKKER-PLANCK EQUATION
HEAT TRANSFER
IMPLOSIONS
LASER FUSION REACTORS
LASER-PRODUCED PLASMA
LASER-RADIATION HEATING
PLASMA SIMULATION
THERMONUCLEAR REACTIONS