激光尾波场驱动准连续小角度电子束研究进展

李荣凤; 高树超; 肖朝凡; 徐智怡; 薛兴泰; 刘建波; 赵研英; 陈佳洱; 卢海洋; 颜学庆

doi:10.7498/aps.66.154101

摘要

报道了在北京大学新建成的5 Hz 200 TW飞秒激光加速器实验装置上利用68 TW（1.7 J，25 fs）的激光与混合气体（99% He掺杂1% N2）进行激光电子加速的初步实验结果与理论分析.在实验中观测到了最大截止能量为290 MeV的连续电子能谱，并且最大输出能量在一定的聚焦范围内基本不变.二维particle-in-cell模拟表明：电离注入导致电子不断注入，使得纵向相空间在激光传播几个毫米后基本被电子填满；之后相空间中电子分布基本保持稳定，随着激光传播距离的增加，输出电子最大能量几乎不变，这与实验观察到的最大输出能量随激光聚焦位置在一定范围内不变的现象一致.实验与模拟结果揭示了在当前实验条件下连续电离注入对电子束品质的影响，为今后进一步优化电离注入电子品质提供了依据.

关键词:

Abstract

Electrons can be accelerated to a GeV level in centimeters by plasma wakefield driven by laser. With the development of chirped pulse amplification technique, the accelerating field can reach 100 GV/m. The laser driven wakefield acceleration experiments with ionization injection are carried out using 68 TW (1.7 J, 25 fs) laser and a mixture gas of 99% He and 1% N2. In experiment, the output electron beam has broadband spectrum with a maximum cut-off energy of about 290 MeV and a maximum output energy is quite stable in a certain range of laser focal positions. Two-dimensional particle-in-cell simulation is carried out. It is found that the longitudinal phase space is occupied by the continuously injected electrons and the phase space distribution is quite stable after the laser has propagated several millimeters inside plasma. This acceleration process can lead to quite stable maximum output energy of electron beam. These experiments reveal the physical nature of continuous ionization injection, which is very important for improving the performance of ionization injection.

Keywords:

作者及机构信息

1.
北京大学物理学院, 核科学与核技术国家重点实验室, 北京 100871;

2.
北京大学应用物理与技术中心, 北京 100871

通信作者: 卢海洋, hylu@pku.edu.cn

基金项目: 国家自然科学基金（批准号：11575011）、国家重大科学仪器设备开发专项（批准号：2012YQ030142）和科技部重点研发专项（批准号：SQ2016ZY04003194）资助的课题.

Authors and contacts

1.
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;

2.
Center for Applied Physics and Technology, Peking University, Beijing 100871, China

Corresponding author: Lu Hai-Yang, hylu@pku.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No.11575011),the National Grand Instrument Project,China (Grant No.2012YQ030142),and the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No.SQ2016ZY04003194).

参考文献

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施引文献

[1]	Tajima T, Dawson J M 1979 Phys. Rev. Lett. 43 267
[2]	Strickland D, Mourou G 1985 Opt. Commun. 55 219
[3]	Gahn C, Tsakiris G D, Pukhov A, Meyer-ter-Vehn J, Pretzler G, Thirolf P, Habs D, Witte K J 1999 Phys. Rev. Lett. 83 4772
[4]	Esarey E, Schroeder C B, Leemans W P 2009 Office of Scientific Technical Information Technical Reports 81 1229
[5]	Faure J, Glinec Y, Pukhov A, Kiselev S, Gordienko S, Lefebvre E, Rousseau J P, Burgy F, Malka V 2004 Nature 431 541
[6]	Geddes C G R, Toth C, Tilborg J V, Esarey E, Schroeder C B, Bruhwller D, Nleter C, Cary J, Leemans W P 2004 Nature 431 538
[7]	Mangles S P, Murphy C D, Najmudin Z, Thomas A G R, Collier J L, Dangor A E, Divall E J, Foster P S, Gallacher J G, Hooker C J, Jaroszynskl D A, Langley A J, Mori W B, Norreys P A, Tsung F S, Viskup R, Walton B R, Krushelnick K 2004 Nature 431 535
[8]	Leemans W P, Nagler B, Gonsalves A J, Toth C, Nakamura K, Geddes C G R, Esarey E, Schroeder C B, Hooker S M 2006 Nat. Phys. 2 696
[9]	Wang X M, Rafal Z, Neil F, Li Z Y, Yi S A, Zhang X, Henderson W, Chang Y Y, Korzekwa R, Tsai H E, Pai C H, Quevedo H, Dyer G, Gaul E, Martinez M, Bernstein A C, Borger T, Spinks M, Donovan M, Khudik V, Shvets G, Ditmire T, Downer M C 2013 Nat. Commun. 4 1988
[10]	Leemans W P, Gonsalves A J, Mao H S, Nakamura K, Benedetti C, Schroeder C B, Toth C, Daniels J, Mittelberger D E, Bulanov S S, Vay J L, Geddes C G R, Esarey E 2014 Phys. Rev. Lett. 113 245002
[11]	Faure J, Rechatin C, Norlin A, Lifschitz A, Glinec Y, Malka V 2006 Nature 444 737
[12]	Schmid K, Buck A, Sears C M S, Mikhailova J M, Tautz R, Herrmann D, Geissler M, Krausz F, Veisz L 2010 Phys. Rev. ST Accel. Beams 13 091301
[13]	Clayton C E, Ralph J E, Albert F, Fonseca R A, Glenzer S H, Joshi C, Lu W, Marsh K A, Martins S F, Mori W B, Pak A, Tsung F S, Pollock B B, Ross J S, Silva L O, Froula D H 2010 Phys. Rev. Lett. 105 105003
[14]	Kameshima T, Hong W, Sugiyama K, Wen X L, Wu Y C, Tang C M, Zhu Q H, Gu Y Q, Zhang B H, Peng H H, Kurokawa S-ichi, Chen L M, Tajima T, Kumita T, Nakajima K 2008 Appl. Phys. Express 1 066001
[15]	Liu J S, Xia C Q, Wang W T, Lu H Y, Wang C, Deng A H, Li W T, Zhang H, Liang X Y, Leng Y X 2011 Phys. Rev. Lett. 107 035001
[16]	Lu H Y, Liu M W, Wang W T, Wang C, Liu J S, Deng A H, Xu J C, Xia C Q, Li W T, Zhang H 2011 Appl. Phys. Lett. 99 091502
[17]	Mirzaie M, Li S, Zeng M, Hafz N A M, Chen M, Li G Y, Zhu Q J, Liao H, Sokollik T, Liu F 2015 Sci. Rep. 5 14659
[18]	Li F, Zhang C J, Wan Y, Wu Y P, Xu X L, Hua J F, Pai C H, Lu W, Gu Y Q, Mori W B 2016 Plasma Phys. Controlled Fusion 58 034004
[19]	Zhang C J, Hua J F, Xu X L, Li F, Pai C H, Wan Y, Wu Y C, Gu Y Q, Mori W B, Joshi C 2016 Sci. Rep. 6 29485
[20]	Shang Y, Zhu K, Lin C, Lu H Y, Zou Y B, Shou Y R, Cao C, Zhao S, Geng Y X 2013 Sci. Sin.: Phys. Mech. Astron. 43 1282
[21]	Chen M, Sheng Z M, Ma Y Y, Zhang J 2006 J. Appl. Phys. 99 056109
[22]	Chen M, Esarey E, Schroeder C B, Geddes C G R, Leemans W P 2012 Phys. Plasmas 19 033101
[23]	Lu H Y, Liu J S, Wang C, Wang W T, Zhou Z L, Deng A H, Xia C Q, Xu Y, Leng Y X, Ni G Q, Li R X, Xu Z Z 2009 Phys. Plasmas 16 083107
[24]	Lu W, Tzoufras M, Joshi C, Tsung F S, Mori W B, Vieira J, Fonseca R A, Silva L O 2007 Phys. Rev. ST Accel. Beams. 10 061301
[25]	Froula D H, Clayton C E, Dppner T, Marsh K A, Barty C P, Divol L, Fonseca R A, Glenzer S H, Joshi C, Lu W, Martins S F, Michel P, Mori W B, Palastro J P, Pollock B B, Pak A, Ralph J E, Ross J S, Siders C W, Silva L O, Wang T 2009 Phys. Rev. Lett. 103 215006

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