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3×10^18-3×10^19W/cm^2条件下,采用前表面厚度为3μm铜、后表面镀4μm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。
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 3×10^18 to 3×10^19 W/cm^2,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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第5期1001-1004,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10775121,10774133,10876039)
等离子体物理国家级重点实验室基金项目(9140C6802030603)
中国科学院创新项目
关键词
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
