强激光与粒子束, 2010, 22 (5): 1001, 网络出版: 2010-09-15
超薄靶激光质子加速实验研究
Experimental study of laser-driven proton acceleration with ultrathin targets
质子加速 靶背法向鞘层加速 截止能量 圆偏振 飞秒激光 proton acceleration target normal sheath acceleration cut-off energy circular polarization femtosecond laser
摘要
在超短超强飞秒SILEX-Ⅰ激光装置上,开展了薄膜靶激光质子加速的实验研究。实验发现激光预脉冲、靶厚度对质子加速有很大的影响。在激光强度3×1018~3×1019 W/cm2条件下, 采用前表面厚度为3 μm铜、后表面镀4 μm厚CH靶, 质子的最大能量达到3.15 MeV。而对190 nm厚CH膜靶, 质子的最大能量为0.54 MeV。初步研究了激光偏振对质子加速的影响, 相同激光功率条件下, 圆偏振激光加速产生的质子最大能量略低于P偏振打靶。这些结果与靶后鞘层加速机制相一致。
Abstract
The generation of proton beams from thin-foil targets on SILEX-Ⅰ is studied. It shows that prepulse has a profound effect on the maximum proton energy. The thinner the target is, the more sensitive it is to the prepulse. Under the laser intensity of 3×1018 to 3×1019 W/cm2, the maximum proton energy is 0.54 MeV with 190 nm CH target and 3.15 MeV with 3 μm Cu target (back surface plated with 4 μm CH) respectively. Besides, the effect of laser polarization on proton acceleration is also studied. The maximum proton energy accelerated by a circularly polarized laser pulse is a little lower than that by a P-polarized laser pulse with the same laser power density. The mechanism is consistent with target normal sheath acceleration.
李勇, 洪伟, 吴玉迟, 朱斌, 何颖玲, 赵宗清, 胡峰, 滕建, 刘东晓, 詹夏宇, 谷渝秋, 王晓方. 超薄靶激光质子加速实验研究[J]. 强激光与粒子束, 2010, 22(5): 1001. Li Yong, Hong Wei, Wu Yuchi, Zhu Bin, He Yingling, Zhao Zongqing, Hu Feng, Teng Jian, Liu Dongxiao, Zhan Xiayu, Gu Yuqiu, Wang Xiaofang. Experimental study of laser-driven proton acceleration with ultrathin targets[J]. High Power Laser and Particle Beams, 2010, 22(5): 1001.