Laser channeling in millimeter-scale underdense plasmas of fast-ignition targets
Laser channeling in millimeter-scale underdense plasmas of fast-ignition targets
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DOI：
10.1103/physrevlett.100.125002
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发表时间：
2008-03-28
影响因子：
8.6
通讯作者：
Mori, W. B.
中科院分区：
文献类型：
--
作者：
Li, G.;Yan, R.;Mori, W. B.
二维粒子胞内模拟表明，激光在毫米级欠致密等离子体中的通道是一个高度非线性的动态过程，涉及纵向等离子体堆积、激光胶管、通道分岔和自校正以及电子加热到相对论性温度。通道速度远小于激光的线群速度。模拟发现，低强度的沟道脉冲可以最大限度地减少所需的激光能量，但如果要在100 ps内建立沟道，则估计强度的下限约为5 × 10(18) W/cm(2)。该沟道还可以显着增加点火脉冲的传输。
Two dimensional particle-in-cell simulations show that laser channeling in millimeter-scale underdense plasmas is a highly nonlinear and dynamic process involving longitudinal plasma buildup, laser hosing, channel bifurcation and self-correction, and electron heating to relativistic temperatures. The channeling speed is much less than the linear group velocity of the laser. The simulations find that low-intensity channeling pulses are preferred to minimize the required laser energy but with an estimated lower bound on the intensity of I approximate to 5x10(18) W/cm(2) if the channel is to be established within 100 ps. The channel is also shown to significantly increase the transmission of an ignition pulse.