凹形靶背对激光等离子体作用产生正电子的汇聚效应研究
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- 英文论文题名：Investigation of hollow back target condensing to positrons produced by laser-plasma interaction
- 论文作者：刘建勋 ; 马燕云 ; 赵军 ; 杨晓虎 ; 张国博 ; 严剑锋
- 英文论文作者：LIU Jian-xun ; MA Yan-yun ; ZHAO Jun ; YANG Xiao-hu ; ZHANG Guo-bo ; YAN Jian-feng ; Science College of National University of Defense Technology ; Air Force Early Warning Academy
- 年：2015
- 作者机构：空军预警学院;国防科技大学理学院;
- 论文关键词：凹形靶背 ; 激光 ; 等离子体 ; 正电子 ; 汇聚
- 英文论文关键词：hollow back target ; laser ; plasma ; positron ; condensing
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第7册（计算物理分卷、核物理分卷、粒子加速器分卷、核聚变与等离子体物理分卷、脉冲功率技术及其应用分卷、辐射物理分卷）
- 语种：中文
- 分类号：O53;TN24
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：5
- 文件大小：348k
- 原文格式：O
- 会议级别：全国
摘要
超强激光与等离子体相互作用可以辐射出大量γ光子,γ光子再与激光场作用形成雪崩效应产生大量正电子,这个多光子过程称为BW过程(Breit-Wheeler)。当激光足够强时,BW过程是激光等离子体相互作用产生正电子的主要过程。获得高密度、高能量的正电子束有助于研究核聚变快点火、宇宙γ射线爆发、黑洞理论和正负电子对的波色-爱因斯坦凝聚。为了提高正电子束的密度和能量,本文使用EPOCH2D程序模拟了超强激光(10~(24)W/cm~2)与一种靶背为凹形的稀薄金等离子体靶作用产生正电子的过程,得到能量为20~180 MeV,最大密度1.9×10~(22)cm~(-3)的正电子束,最大密度比平板靶产生的正电子最大密度高1.5×10~(21)cm~(-3)。结果表明,超强激光将凹形靶背中电子排出,形成电荷分离场,电荷分离场对正电子汇聚,有利于提高正电子束密度。
Multi-gamma photons,produced by the interaction of Extreme power laser and plasma,can burst multi-positrons by interacting with laser field in turn through cascade.This multi-photon process is named BW process,which is the main process in producing positrons when the laser intensity is high enough.Positron beam with high density and energy can improve the study of fast ignition,gamma ray bursts in space,black holes as well as Ps Bose-Einstein condensate.To get high density and high energy positron beam,the interaction of extreme intensity laser and plasma target with hollow back was simulated with the EPOCH2 D code in this paper.Positron beam,with the max number density 1.9×10~(22)cm~(-3) and positron energy between 20-180 MeV,is 1.5×10~(21)cm~(-3) higher than that produced in the flat target in max number density.The field in the target's hollow back raises the positron number density.
Multi-gamma photons,produced by the interaction of Extreme power laser and plasma,can burst multi-positrons by interacting with laser field in turn through cascade.This multi-photon process is named BW process,which is the main process in producing positrons when the laser intensity is high enough.Positron beam with high density and energy can improve the study of fast ignition,gamma ray bursts in space,black holes as well as Ps Bose-Einstein condensate.To get high density and high energy positron beam,the interaction of extreme intensity laser and plasma target with hollow back was simulated with the EPOCH2 D code in this paper.Positron beam,with the max number density 1.9×10~(22)cm~(-3) and positron energy between 20-180 MeV,is 1.5×10~(21)cm~(-3) higher than that produced in the flat target in max number density.The field in the target's hollow back raises the positron number density.
引文
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[2]王少阶.正电子能量转换研究进展[J].原子核物理评论.2004,4:21.
[3]Chen H,Wilks SC,Bonlie JD,Liang EP,Myatt J,Price DF,et al.Relativistic positron creation using ultraintense short pulse lasers[J].Physical review letters,2009,102(10):105001.
[4]闫永宏,赵宗清,吴玉迟,等.超短超强激光产生正电子的蒙特卡罗模拟[J].强激光与粒子束,2012,24(6):1396-400.
[5]Brady CS,Ridgers C,Arber T,Bell A,Kirk J.Laser absorption in relativistically underdense plasmas by synchrotron radiation[J].Physical review letters,2012,109(24):245006.
[6]Chen H,Fiksel G,Barnak D,Chang P-Y,Heeter R,Link A,et al.Magnetic collimation of relativistic positrons and electrons from high intensity laser-matter interactions[J].Physics of Plasmas(1994-present),2014,21(4):040703.
[7]Sarri G,Schumaker W,Di Piazza A,Vargas M,Dromey B,Diec km ann ME,et al.Table-top laser-based source of femtosecond,collimated,ultrarelativistic positron beams[J].Physical review letters,2013,110(25):255002.
[8]Chen H,Wilks S,Meyerhofer D,Bonlie J,Chen C,Chen S,et al.Relativistic quasimonoenergetic positron jets from intense laser-solid interactions[J].Physical review letters,2010,105(1):015003.
[9]Muller C,Keitel CH.Antimatter:Abundant positron production[J].Nature Photonics,2009,3(5):245-6.
[10]Ridgers C,Brady CS,Duclous R,Kirk J,Bennett K,Arber T,et al.Dense electron-positron plasmas and bursts of gamma-rays from laser-generated quantum electrodynamic plasmas[J].Physics of Plasmas.2013,20(5):Article number 056701.
[11]Ma YY,Kawata S,Yu TP,Gu YQ,Sheng ZM,Yu MY,et al.Electron bow-wave injection of electrons in laser-driven bubble acceleration[J].Physical Review E,2012,85(4):046403.