摘要
Acceleration of protons by a circularly polarized laser pulse irradiating on a double-layer target is investigated by a theoretical model and particle-in-cell simulations.The target is made up of a heavy ion layer coated with a proton layer on the rear surface.The results show that when the first layer is transparent induced by the hole-boring effect,the whole proton layer is accelerated by the transmitted laser pulse to high energy with low energy spread.The quality of the proton beam generated from a double-layer target is better than that from a single-layer target.The improvement is attributed to the flat top structure of the electrostatic field caused by the electrons injected into the second layer.It is easier to control the spectrum quality by using a double-layer target rather than using a single-layer one when the radiation pressure acceleration is dominant.
作者
夏长权
邓爱华
刘丽
王文涛
卢海洋
王成
刘建胜
XIA Chang-Quan;DENG Ai-Hua;LIU Li;WANG Wen-Tao;LU Hai-Yang;WANG Cheng;LIU Jian-Sheng(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,P.O.Box 800-211,Shanghai 201800)
基金
by the National Basic Research Program of China under Grant No 2006CB806000
the National National Natural Science Foundation of China under Grant Nos 10974214 and 60921004
the State Key Laboratory Program of the Ministry of Science and Technology of China,and the Knowledge Innovation Project of Chinese Academy of Sciences.