强激光与细锥靶相互作用产生强流高能电子束的研究  

Numerical studies on intense laser-generated relativistic high-energy electrons via a thin cone target

作　　者：穆洁[1] 盛政明[1] 郑君[1] 张杰[1] 

机构地区：[1]上海交通大学物理系 激光等离子体教育部重点实验室,上海200240

出　　处：《物理学报》2013年第13期390-397,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11075105,11121504,10905039)资助的课题~~

摘　　要：本文提出采用了强激光与细锥形靶作用,产生大量定向高能电子,用于快点火激光聚变方案研究.通过PIC模拟,研究了细锥靶和激光脉冲的各项参数,对产生高能电子的影响.模拟发现,细锥靶开口10时能够产生较多的高能电子,当开口角度逐渐增大时,高能电子的能量和数目都有一定程度下降.若为细锥靶加上预等离子体,产生的高能电子的数目将大大提高,而最高的电子能量将会下降.中等能量的电子加速主要由于激光有质动力加速,而高能量的电子加速主要由于电子感应加速.随着激光脉宽的增加,高能电子的数量直线上升.It is proposed that with a mini-cone target, an enormous number of high-energy collimated electrons can be produced, which may be used for fast ignition research. The effect of different laser and cone target diameters on high-energy electrons are studied with twodimensional particle-in-cell simulations. When the open angle of the mini-cone is 10 degree, the number of generated hot electrons is relatively larger. With the increase of the open angle, both the energy and number of hot electrons decrease. When preplasma is added to the cone surface, the amount of hot electrons increases, while the peak energy of the hot electrons decreases. With the increase of the laser pulse duration, the number of high-energy electrons increases linearly.

关 键 词：细锥形靶 电子加速 感应共振加速 

分 类 号：TL503.4[核科学技术—核技术及应用]