物理学报2024，Vol.73Issue(11)：195-207,13.DOI:10.7498/aps.73.20240032
利用均匀密度等离子体通道加速质子的辐射压力增强方案
An enhanced radiation pressure acceleration scheme for accelerating protons using the uniform density plasma channel
摘要
Abstract
High-energy proton beams have broad application prospects in medical imaging,tumor therapy and nuclear fusion physics.Laser plasma acceleration is a new particle acceleration method with great potential because its acceleration gradient can reach 103-106 times that of traditional acceleration method,so it can theoretically accelerate electrons and ions to high energies in the scale of a few centimeters to a few meters.Radiation pressure acceleration(RPA)is considered to be the most promising mechanism of high energy proton acceleration in laser plasma acceleration,but the Rayleigh-Taylor instability(RTI)inherent in the process of radiation pressure acceleration will cause transverse density modulation on the target surface,resulting in the premature termination of the proton acceleration process and the failure to obtain high energy proton beams.In order to obtain high-energy proton beams,an acceleration scheme combining radiation pressure acceleration with laser wakefield is proposed.In this scheme,a high-energy proton beam with peak energy of 22.2 GeV,cut-off energy of 36.4 GeV and charge of 0.67 nC is obtained by adding a uniform density plasma channel at the back end of the thin target with critical density,the cut-off energy of the high energy proton can be increased by two orders of magnitude compared with the proton only in the radiation pressure acceleration process.The results confirm that in a uniform-density plasma channel connected behind a thin target,the laser wakefield can capture protons pre-accelerated by the radiation pressure process and maintain the acceleration for a long period of time,finally obtain high-energy protons.The acceleration of protons in plasma channels with different uniform densities is also investigated in this work,and it is found that the higher the density,the higher the peak energy,cut-off energy and charge of the accelerated protons are.The combined acceleration scheme is instructive for the generation and application of high-energy proton beams.关键词
辐射压力加速/激光尾波场加速/高能质子束/等离子体通道Key words
radiation pressure acceleration/laser wakefield acceleration/high-energy proton beam/plasma channel引用本文复制引用
杨露,周海龙,张玮炜,兰小飞,何阳帆,王晓南,陈鑫,陈鹏帆,夏倩雯,熊力,龙昊雨,李林洋,毛小保..利用均匀密度等离子体通道加速质子的辐射压力增强方案[J].物理学报,2024,73(11):195-207,13.基金项目
西华师范大学英才研究基金(批准号:17YC504)和西华师范大学科研基金(批准号:17E095)资助的课题. Project supported by the Meritocracy Research Funds of China West Normal University,China(Grant No.17YC504)and the Research Funds of China West Normal University,China(Grant No.17E095). （批准号:17YC504）
