Intense laser-driven energetic proton beams from solid density targets.
Intense laser-driven energetic proton beams from solid density targets.
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DOI：
10.1364/ol.32.002444
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发表时间：
2007-08
期刊：
影响因子：
3.6
通讯作者：
Cangtao Zhou;Xiantu He
中科院分区：
文献类型：
--
作者：
Cangtao Zhou;Xiantu He
采用二维混合粒子模拟方法研究了靶密度对亚皮秒强激光脉冲驱动质子加速的影响。结果表明，在较高密度下，对塑料靶产生的质子，靶鞘法向加速比冲击加速更有效。此外，较低密度的靶有利于较高能量的TNSA质子。此外，纵向电场在目标表面可以揭示典型的非均匀结构的一个长的加速时间。激光能量到粒子（电子、质子和C（+）离子）能量的转换效率随靶密度的降低而增加。
The effects of target density on proton acceleration driven by an intense sub-ps laser pulse are investigated using two-dimensional hybrid particle-in-cell simulations. Results show that at higher density the target-normal-sheath acceleration (TNSA) is more effective than shock acceleration for protons from a plastic target. Furthermore a lower-density target is favorable to higher energy of the TNSA protons. Moreover, the longitudinal electric fields at the target surfaces may reveal typical inhomogeneous structures for a long acceleration time. The conversion efficiency of laser energy into particle (electron, proton, and C(+) ion) energy is found to increase with decreasing target density.