Compton散射下正弦三角等离子体中正电子的加速
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摘要
应用多光子非线性Compton散射模型和数值模拟方法,研究了正弦三角超强激光等离子的尾场对正电子加速,提出了将入射超强激光和非线性Compton散射光作为等离子体尾场对正电子加速的新机制,给出了正电子加速能量修正公式和数值模拟结果。结果表明:使用非对称正弦三角激光脉冲的等离子体尾场加速正电子优于对称正弦三角激光脉冲的尾场情况,散射使非对称正弦三角耦合激光脉冲宽度和上升长度与下降长度之比缩小,正电子获得的加速能量显著增大。这是因为正电子频率增大,横向速度各向异性分布增强,尾场限制了正电子横向加速能量,导致正电子在激光传输方向加速能量增大。
By using the model of multi-photon nonlinear Compton scattering and numerical simulating method,the positive electron acceleration in the wake field of the sine triangulation extra-intense laser-plasma is studied, a new mechanism on the positive electron acceleration in the plasma wake field produced by the incident extra-intense laser and nonlinear Compton scattered light is given, and the revised formula and numberical simulation results on the positive electron acceleration energy are given out. The results show that the acceleration effect on the plasma wake field of the extra-intense laser pulse of non-symmetry sine triangle to the positive electron is better than the plasma wake field of the extra-intense laser pulse of symmetry sine triangle, the width of the coupling laser pulse of the non-symmetry sine triangle and the ratio of the pulse increasing length and decreasing length is decreased by Compton scattering, and the acceleration energy of the positive electron is clearly increased. The causes that acceleration energy in the laser propagation direction of the positive electron is increased are that the positive electron frequency increases, the anisotropic distribution of the transverse speed of the positive electron is increased and the acceleration energy in the transverse direction of the positive electron is limited by the wake field.
By using the model of multi-photon nonlinear Compton scattering and numerical simulating method,the positive electron acceleration in the wake field of the sine triangulation extra-intense laser-plasma is studied, a new mechanism on the positive electron acceleration in the plasma wake field produced by the incident extra-intense laser and nonlinear Compton scattered light is given, and the revised formula and numberical simulation results on the positive electron acceleration energy are given out. The results show that the acceleration effect on the plasma wake field of the extra-intense laser pulse of non-symmetry sine triangle to the positive electron is better than the plasma wake field of the extra-intense laser pulse of symmetry sine triangle, the width of the coupling laser pulse of the non-symmetry sine triangle and the ratio of the pulse increasing length and decreasing length is decreased by Compton scattering, and the acceleration energy of the positive electron is clearly increased. The causes that acceleration energy in the laser propagation direction of the positive electron is increased are that the positive electron frequency increases, the anisotropic distribution of the transverse speed of the positive electron is increased and the acceleration energy in the transverse direction of the positive electron is limited by the wake field.
引文
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15 Liu Xiaolan,Liu Sanqiu,Yang Xiaosong.Strong Langmuir turbulence excited by laser near critical surface[J].Laser Technology,2007,31(2):213-216.刘笑兰,刘三秋,杨小松.激光等离子体临界面处的墙朗缪尔湍动[J].激光技术,2007,31(2):213-216.
16 Chen Huaying,Liu Sanqiu.Collapse behavior of laser beam in plasma[J].High Power Laser and Particle Beams,2010,22(12):2885-2888.陈华英,刘三秋.激光在等离子体中的坍塌行径[J].强激光与粒子束,2010,22(12):2885-2888.
17 Hao Dongshan.Influence of modulation instability induced by Langmuir turbulence in plasma[J].Nuclear Fusion and Plasma Physics,2013,33(1):19-24.郝东山.等离子体中朗缪尔湍动对调制不稳定性的影响[J].核聚变与等离子体物理,2013,33(1):19-24.
18 Zakir Arkin,Abudourexiti Abudoureuti.Simulation of positron acceleration in the wake field of sine laser pulses[J].Laser Technology,2013,37(1):130-133.艾尔肯·扎克尔,阿不都热苏力·阿不都热西提.正弦三角激光脉冲尾场加速正电子模拟[J].激光技术,2013,37(1):130-133.
19 Kong Qing,Zhu Lijun,Wang Jiaxiang,et al..Electron dynamics in the extra-intense stationary laser field[J].Acta Physica Sinica,1999,48(4):650-660.孔青,朱立俊,王加祥,等.电子在超强激光场中的动力学特性[J].物理学报,1999,48(4):650-660.
2 Wang Ruirong,Chen Weimin,Xie Dongzhu.Characteristics of X-ray photons in tilted incident laser-produced plasma[J].High Power Laser and Particle Beams,2008,20(3):387-390.王瑞荣,陈伟民,谢东珠.斜辐照激光等离子体辐射X光子特性[J].强激光与粒子束,2008,20(3):387-390.
3 Bin Jianhui,Lei Anle,Yu Wei.Influence of initial plasma temperature on energetic proton generation from laserplasma interactions[J].Chinese J Lasers,2009,36(6):1416-1419.宾建辉,雷安乐,余玮.等离子体初始温度对强激光与等离子体相互作用中的高能质子产生的影响[J].中国激光,2009,36(6):1416-1419.
4 Wen Hua,Hao Xiaofei,Hao Dongshan.Influence of initial plasma temperature on proton generation under Compton scattering[J].Laser&Optoelectronics Progress,2012,49(8):081902.文桦,郝晓飞,郝东山.Compton散射下等离子体初温对质子产生的影响[J].激光与光电子学进展,2012,49(8):081902.
5 Song Zhenxing,He liming,Zhang Jianbang,et al..3D numerical simulation of supersonic plasma ignition process[J].High Power Laser and Particle Beams,2012,24(11):2747-2750.宋振兴,何立明,张建邦,等.超音速等离子体快点火过程的三维数值模拟[J].强激光与粒子束,2012,24(11):2747-2750.
6 Yan Xiliang,Hao Dongshan.Influences of Compton scattering on the self-focusing of the intense laser-pulse on underdense plasma[J].Optical Technique,2014,40(1):50-52.闫喜亮,郝东山.Compton散射对短脉冲强激光在次临界等离子体中的自聚焦的影响[J].光学技术,2014,40(1):50-52.
7 Zhang Xingqiang,Lu Jianye.Preliminary analysis of laser sustained plasma propulsion mechanism[J].Chinese J Lasers,2013,40(8):0802008.张兴强,鲁建业.激光等离子体推进机理的初步分析[J].中国激光,2013,40(8):0802008.
8 Hao Dongshan.Influences of Compton scattering to temporal evolution of plasma density in femto-second light filaments[J].Chinese J Lasers,2014,41(5):0505002.郝东山.康普顿散射对飞秒光丝中等离子体密度时演特性的影响[J].中国激光,2014,41(5):0505002.
9 Feng Guanghui,Hao Dongshan.Influences of Compton scattering on transverse dispersion of relativistic electronpositron plasma[J].Laser&Optoelectronics Progress,2014,51(3):031401.冯光辉,郝东山.Compton散射对相对论正负电子对等离子体横色散的影响[J].激光与光电子学进展,2014,51(3):031401.
10 T Tajima,J M dawson.Laser electron accelerator[J].Physical review Letters,1979,43(4):267-270.
11 X Wang,R Ischebeck,P Muggli,et al..Positron injection and acceleration on the wake driven by an electron beam in a foil-and-gas plasma[J].Physical Review Letters,2008,101(12):124801-124805.
12 T Esirkepov,S V Bulanov,M Yamagiwa,et al..Electron,Positon,and photonwakefield acceleration:Trapping roake overtaking,and ponderomotive acceleration[J].Physical Review Letters,2006,96(1):014803.
13 S V Bulanov,M Yamagiwa,T Esirkepov,et al..Spectral and dynamical leathers of the electron bunch accelerated by a short-pulse high intensity laser in an underdense plasma[J].Physics of Plasmas,2005,12(7):073103.
14 Lai Guojun,Ji Peiyong.Photon acceleration based laser-plasma[J].Acta Physica Sinica,2000,49(12):2339-2403.赖国俊,季沛勇.基于激光等离子体的光子加速[J].物理学报,2000,49(12):2339-2403.
15 Liu Xiaolan,Liu Sanqiu,Yang Xiaosong.Strong Langmuir turbulence excited by laser near critical surface[J].Laser Technology,2007,31(2):213-216.刘笑兰,刘三秋,杨小松.激光等离子体临界面处的墙朗缪尔湍动[J].激光技术,2007,31(2):213-216.
16 Chen Huaying,Liu Sanqiu.Collapse behavior of laser beam in plasma[J].High Power Laser and Particle Beams,2010,22(12):2885-2888.陈华英,刘三秋.激光在等离子体中的坍塌行径[J].强激光与粒子束,2010,22(12):2885-2888.
17 Hao Dongshan.Influence of modulation instability induced by Langmuir turbulence in plasma[J].Nuclear Fusion and Plasma Physics,2013,33(1):19-24.郝东山.等离子体中朗缪尔湍动对调制不稳定性的影响[J].核聚变与等离子体物理,2013,33(1):19-24.
18 Zakir Arkin,Abudourexiti Abudoureuti.Simulation of positron acceleration in the wake field of sine laser pulses[J].Laser Technology,2013,37(1):130-133.艾尔肯·扎克尔,阿不都热苏力·阿不都热西提.正弦三角激光脉冲尾场加速正电子模拟[J].激光技术,2013,37(1):130-133.
19 Kong Qing,Zhu Lijun,Wang Jiaxiang,et al..Electron dynamics in the extra-intense stationary laser field[J].Acta Physica Sinica,1999,48(4):650-660.孔青,朱立俊,王加祥,等.电子在超强激光场中的动力学特性[J].物理学报,1999,48(4):650-660.