摘要
From numerical simulations,we study the generation of quasi-monoenergetic MeV proton beams from a laserilluminated funnel-like target.We show that,when passing through such a target,the laser beam can be focused and constricted within a cylindrical bore at the funnel apex from which proton beams are produced.Accompanied by a much-enhanced laser intensity,the proton beams experience more acceleration time than with normal funnel targets.Constriction from the cylinder bore,combined with an enhancement of a separated charge field from Al electrons,protons can attain higher energies up to several tens of MeV.At the same time,strong suppression of the transverse divergence of the laser and proton beams yields a localized,collimated,mono-energetic proton beam.
作者
班洪叶
顾彦珺
孔青
李英瑛
朱真
S.Kawata
BAN Hong-Ye;GU Yan-Jun;KONG Qing;LI Ying-Ying;ZHU Zhen;S.Kawata(Applied Ion Beam Physics Laboratory,Key Laboratory of the Ministry of Education,Institute of Modern Physics,Fudan University,Shanghai 200433;Department of Interdisciplinary Sciences,Utsunomiya University,Yohtoh 712,Utsunomiya 3218585,Japan)
基金
Supported by the National Natural Science Foundation of China under Grant No 11175048
the Shanghai Nature Science Foundation(No 11ZR1402700)
the Shanghai Scientific Research Innovation Key Project(No 12ZZ011)
The Shanghai Leading Academic Discipline Project(B107)
the JSPS-CAS CUP Program and the CORE of Utsunomiya University.