Enhanced laser ion acceleration from mass-limited targets
Enhanced laser ion acceleration from mass-limited targets
复制标题
DOI：
10.1017/s0263034608000268
复制
发表时间：
2008-06
影响因子：
0.9
通讯作者：
J. Limpouch;J. Psikal;A. Andreev;K. Platonov;S. Kawata
中科院分区：
文献类型：
--
作者：
J. Limpouch;J. Psikal;A. Andreev;K. Platonov;S. Kawata
本文采用相对论电磁二维粒子模拟程序，研究了激光与质量受限靶的相互作用。分析估计，以澄清模拟结果。质量受限的目标排除了所吸收的激光能量在相互作用区之外的不期望的扩散。质量有限的目标，如液滴，在这里显示，以提高可实现的快速离子能量显着由于热电子浓度的增加。对于给定的目标尺寸，存在一个最佳的激光束直径时，离子加速是有效的，几何能量损失仍然是可以接受的。离子能量也取决于目标的几何形状和圆形的目标被发现，以提高加速离子的能量。除了电磁波的普通散射之外，加速过程还伴随着偶极辐射的产生。
Laser interactions with mass-limited targets are studied here via numerical simulations using our relativistic electromagnetic two-dimensional particle-in cell code including all three-velocity components. Analytical estimates are derived to clarify the simulation results. Mass-limited targets preclude the undesirable spread of the absorbed laser energy out of the interaction zone. Mass-limited targets, such as droplets, are shown here to enhance the achievable fast ion energy significantly due to an increase in the hot electron concentration. For given target dimensions, the existence is demonstrated for an optimum laser beam diameter when ion acceleration is efficient and geometrical energy losses are still acceptable. Ion energy also depends on the target geometrical form and rounded targets are found to enhance the energy of accelerated ions. The acceleration process is accompanied by generation of the dipole radiation in addition to the ordinary scattering of the electromagnetic wave.