Particle-in-cell simulations of laser–plasma interaction for the shock ignition scenario
Particle-in-cell simulations of laser–plasma interaction for the shock ignition scenario
复制标题
DOI：
10.1088/0741-3335/52/5/055013
复制
发表时间：
2010-05
影响因子：
2.2
通讯作者：
O. Klimo;S. Weber;V. Tikhonchuk;J. Limpouch
中科院分区：
文献类型：
--
作者：
O. Klimo;S. Weber;V. Tikhonchuk;J. Limpouch
数值模拟了激光脉冲与非均匀、大尺寸、高温等离子体的相互作用。激光脉冲强度为1016 W cm−2，等离子体温度为5 keV，密度标度长度为300 µm，对应于冲击点火场景的条件。它表明，后一个短的初始突发的后向散射，一个显着的一部分，入射激光辐射被吸收在欠稠密等离子体和能量被传输到稠密等离子体的电子与能量20-40 keV。在低于四分之一临界密度的密度范围内，吸收机制与自组织共振器和大振幅等离子体波的空化有关。讨论了反射光的时间和光谱特性。
Numerical simulations of the laser pulse interaction with an inhomogeneous, large size, high temperature plasma are presented. The laser pulse intensity, 1016 W cm−2, plasma temperature, 5 keV, and the density scale length of 300 µm correspond to the conditions of the shock ignition scenario. It is demonstrated that after a short initial burst of backscattering, a significant part of the incident laser radiation is absorbed in the underdense plasma and the energy is transported to the dense plasma by electrons with energies 20–40 keV. The absorption mechanism is associated with a self-organized resonator and cavitation of large-amplitude plasma waves in the density range below the quarter critical density. The temporal and spectral properties of reflected light are discussed.