Nodera Y, Kawata S, Onuma N, Limpouch J, Klimo O, Kikuchi T
Graduate School of Engineering, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Oct;78(4 Pt 2):046401. doi: 10.1103/PhysRevE.78.046401. Epub 2008 Oct 15.
Improvement of energy-conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser-foil interaction. When an intense short-pulse laser illuminates the thin-foil target, the foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the foil protons, and the proton beam is generated. In this paper a multihole thin-foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the foil target help to enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional ( x, y, vx, vy, vz) simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the multihole target, though the energy-conversion efficiency is 1.5% for a plain thin-foil target. The maximum proton energy is 10.0 MeV for the multihole target and is 3.14 MeV for the plain target. The transpiercing multihole target serves as a new method to increase the energy-conversion efficiency from laser to ions.
通过激光 - 箔片相互作用中的粒子模拟，证明了从激光到质子束的能量转换效率得到了提高。当强短脉冲激光照射薄箔靶时，箔片电子在有质动力的作用下在靶周围被加速。热电子产生强电场，加速箔片质子，从而产生质子束。本文提出了一种多孔薄箔靶，以提高从激光到质子的能量转换效率。贯穿箔靶的多个孔有助于显著提高激光 - 质子能量转换效率。二维粒子模拟（x、y、vx、vy、vz）表明，对于多孔靶，激光 - 质子总能量转换效率为9.3%，而对于普通薄箔靶，能量转换效率为1.5%。多孔靶的最大质子能量为10.0 MeV，普通靶的最大质子能量为3.14 MeV。贯穿的多孔靶是提高从激光到离子能量转换效率的一种新方法。
