啁啾展宽激光脉冲的有限带宽效应对参量不稳定性及超热电子的抑制  

FINITE BANDWIDTH EFFECT OF REDUCTION IN PARAMETRIC INSTABILITIES AND SUPERATHERMAL ELECTRONS USING CHIRPED STRETCHED LASER PULSE

作　　者：吴衍青[1] 韩申生[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海800211信箱201800

出　　处：《强激光与粒子束》1999年第4期450-454,共5页High Power Laser and Particle Beams

基　　金：国家863 惯性约束聚变领域资助课题;国家自然科学基金

摘　　要：若驱动激光的相干时间小于不稳定性增长时间，则有可能直接控制参量不稳定性。研究了有限带宽的啁啾展宽脉冲对等离子体冕区参量不稳定性及超热电子的抑制效果，给出解析分析及用 Ｐ Ｉ Ｃ程序数值模拟结果，考察了电子—离子碰撞对超热电子的影响。The threshold of parametric instabilities will be increased and the growth rate will fall down if the coherence time of pump laser is less than the rise time of parametric instabilities. The paper shows the finite bandwidth effect of reduction in parametric instabilities and superathermal electrons using chirped stretched laser pulse. Both analytical solutions and the results of numerical simulation using PIC code are presented. The effect of electron ion collision on suprathermal electrons is also investigated.

关 键 词：有限带宽 激光脉冲 参量不稳定性 超热电子 

分 类 号：TN241[电子电信—物理电子学]