J. Phys. IV France
Volume 133, June 2006
|Page(s)||391 - 395|
|Publié en ligne||16 juin 2006|
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 391-395
Simulation of heating-compressed fast-ignition cores by petawatt laser-generated electronsT.A. Mehlhorn1, R.B. Campbell1, R. Kodama2, K.A. Tanaka2, 3, D.R. Welch4, S.A. Slutz1, R.A. Vesey1, D.L. Hanson1, M.E. Cuneo1 and J.L. Porter1
1 Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
2 Institute of Laser Engineering (ILE), Osaka University, Suita, Osaka 565-0871, Japan
3 Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
4 ATK/Mission Research Corporation, Albuquerque, New Mexico 87110, USA
In this work, unique particle-in-cell simulations to understand the relativistic electron beam thermalization and subsequent heating of highly compressed plasmas are reported. The simulations yield heated core parameters in good agreement with the GEKKO-PW experimental measurements, given reasonable assumptions of laser-to-electron coupling efficiency and the distribution function of laser-produced electrons. The classical range of the hot electrons exceeds the mass density-core diameter product L by a factor of several. Anomalous stopping appears to be present and is created by the growth and saturation of an electromagnetic filamentation mode that generates a strong back-EMF impeding hot electrons on the injection side of the density maxima .This methodology is then applied to the design of experiments for the ZR machine coupled to the Z-Beamlet/PW laser.
© EDP Sciences 2006