Gong Zheng, Shou Yinren, Tang Yuhui, Hu Ronghao, Yu Jinqing, Ma Wenjun, Lin Chen, Yan Xueqing
State Key Laboratory of Nuclear Physics and Technology, KLHEDP, and CAPT, School of Physics, Peking University, Beijing 100871, China.
College of Physics, Sichuan University, Chengdu 610065, China.
Phys Rev E. 2020 Jul;102(1-1):013207. doi: 10.1103/PhysRevE.102.013207.
Leveraging on analyses of Hamiltonian dynamics to examine the ion motion, we explicitly demonstrate that the proton sheet crossing and plateau-type energy spectrum are two intrinsic features of the effectively accelerated proton beams driven by a drift quasistatic longitudinal electric field. Via two-dimensional particle-in-cell simulations, we show the emergence of proton sheet crossing in a relativistically transparent plasma foil irradiated by a linearly polarized short pulse with the power of one petawatt. Instead of successively blowing the whole foil forward, the incident laser pulse readily penetrates through the plasma bulk, where the proton sheet crossing takes place and the merged self-generated longitudinal electric field traps and reflects the protons to yield a group of protons with plateau-type energy spectrum.
利用哈密顿动力学分析来研究离子运动，我们明确证明了质子穿过薄片和平台型能谱是由漂移准静态纵向电场驱动的有效加速质子束的两个固有特征。通过二维粒子模拟，我们展示了在被一太瓦功率的线偏振短脉冲辐照的相对论透明等离子体箔中质子穿过薄片的现象。入射激光脉冲不是连续地将整个箔向前吹，而是很容易穿透等离子体主体，在那里发生质子穿过薄片的现象，合并产生的自生纵向电场捕获并反射质子，从而产生一组具有平台型能谱的质子。
