摘要
利用1维粒子模拟程序,研究了超短超强激光脉冲与超薄双层靶(基底层和加速层厚度均为nm量级)相互作用产生准单能质子束的过程。研究表明,基底层厚度及加速层厚度对质子能谱的影响至关重要。减小基底层厚度,靶后静电场增强,质子的最大能量显著增大;减小加速层厚度,靶后静电场分布变得更加均匀,质子能谱中心能量变化不大,单能性变好。通过优化参数,获得了能散度为7%的准单能质子束。
The quasi-monoenergetic proton beam generated from ultra-short ultra intense laser pulse interacting with ultra- thin double-layer target （both the thickness of the substrate layer and that of the acceleration layer are in nanometer scale） is ex- amined by one-dimensional particle-in-cell simulation. The thickness of the substrate and the acceleration layer is crucial to the proton spectrum. The quasi-static electric field becomes stronger as the substrate layer thickness decreases, which results in the enhancement of the maximum proton energy. Reducing the acceleration layer thickness induces a more uniform quasi-static electric field. As a result, the proton spectrum becomes more monoenergetic with nearly unchanged mean energy. The quasi-monoener- getic proton with an energy spread of about 7 %has been produced by optimizing parameters.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第7期1548-1552,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10605038,10975185,10976031)
国防科学技术大学优秀研究生创新资助项目(S080202)
关键词
粒子模拟方法
超薄双层靶
质子能谱
准单能
particle-in-cell simulation
ultrathin double layer target
proton spectrum
quasi-monoenergetic
