强激光锥型靶真空电子加速数值模拟研究
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摘要
真空激光加速机制具有加速场梯度大、加速电子电量高的优点,目前制约真空加速机制研究发展的主要问题是如何产生具有一定初速度的电子并将其注入加速场。提出了一种利用强激光与锥型靶相互作用产生高能电子并实现真空加速的新方法,利用二维PIC(Particle-in-cell)粒子模拟程序对这一方法进行了研究。模拟结果显示,对于光强为1021 W/cm2量级的高斯激光脉冲,产生了能量为GeV量级、发散角约为1°的强流快电子束。此外还通过理论解析和参数模拟研究了靶半径对这种超热电子加速机制的影响。
Vacuum laser acceleration(VLA)has the advantages of large gradient of acceleration field and large charge of collimated electrons.For certain topics,the production of electrons with initial velocity and the injection of these electrons in vacuum are main problems restricting the development of VLA.A new vacuum laser acceleration scheme is proposed in this paper,in which an ultra-short ultra-intense laser pulse is grazing incident into a cone target.Two-dimensional particle-in-cell simulation is used to confirm this acceleration scheme,which can produce collimated GeV-class electron beams in millimeters.The intense laser pulse is a linearly y-polarized laser with intensity of 1021 W/cm2.The effect of radius of the target is studied in this paper.
Vacuum laser acceleration(VLA)has the advantages of large gradient of acceleration field and large charge of collimated electrons.For certain topics,the production of electrons with initial velocity and the injection of these electrons in vacuum are main problems restricting the development of VLA.A new vacuum laser acceleration scheme is proposed in this paper,in which an ultra-short ultra-intense laser pulse is grazing incident into a cone target.Two-dimensional particle-in-cell simulation is used to confirm this acceleration scheme,which can produce collimated GeV-class electron beams in millimeters.The intense laser pulse is a linearly y-polarized laser with intensity of 1021 W/cm2.The effect of radius of the target is studied in this paper.
引文
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[2]Wilks S C,Langdon A B,Cowan T E,et al.Energetic proton generation in ultra-intense laser-solid interactions[J].Phys Plasmas,2001,8:542-549.
[3]周维民,谷渝秋,丁永坤,等.超短超强激光与Cu靶相互作用中质子背向发射的实验测量[J].强激光与粒子束,2004,16(11):1406-1408.(Zhou Weimin,Gu Yuqiu,Ding Yongkun,et al.Measurement of proton jet in the interaction of ultra-short ultra-intense laser with Cu foil target.High Power Laser and Particle Beams,2004,16(11):1406-1408)
[4]Tabak M,Hammer J,Glinsky M E,et al.Ignition and high gain with ultrapowerful lasers[J].Phys Plasmas,1994,1(5):1626-1634.
[5]谷渝秋,张锋,单连强,等.神光Ⅱ升级装置锥壳靶间接驱动快点火集成实验[J].强激光与粒子束,2015,27:110101.(Gu Yuqiu,Zhang Feng,Shan Lianqiang,et al.Initial indirect cone-in-shell fast ignition integrated experiment on ShenguangⅡ-updated facility.High Power Laser and Particle Beams,2015,27:110101)
[6]Tajima T,Dawson J M.Laser electron accelerator[J].Phys Rev Lett,1979,43(4):267-270.
[7]Woodward P M.A method of calculating the field over a plane aperture required to produce a given polar diagram[J].J Inst Electr Eng,1947,93(10):1554-1558.
[8]Esarey E,Sprangle P,Krall J.Laser acceleration of electrons in vacuum[J].Phys Rev E,1995,52(5):5443-5453.
[9]Wang P X,Ho Y K,Yuan X Q,et al.Vacuum electron acceleration by an intense laser[J].Appl Phys Lett,2001,78(15):2253-2255.
[10]Wang P X,Ho Y K,Yuan X Q,et al.Characteristics of laser-driven electron acceleration in vacuum[J].Appl Phys Lett,2002,91(2):856-866.
[11]Pang J,Ho Y K,Yuan X Q,et al.Subluminous phase velocity of a focused laser beam and vacuum laser acceleration[J].Phys Rev E,2002,66:066501.
[12]Thevenet M,Leblanc A,Kahaly S,et al.Vacuum laser acceleration of relativistic electrons using plasma mirror injectors[J].Nat Phys,2016,12:355-361.
[13]Xiao K D,Huang T W,Ju L B,et al.Energetic electron-bunch generation in a phase-locked longitudinal laser electric field[J].Phys Rev E,2016,93:043207.
[14]Zhang Z M,He X T,Sheng Z M,et al.Hundreds MeV monoenergetic proton bunch from interaction of 1020-21 W/cm2 circularly polarized laser pulse with tailored complex target[J].Appl Phys Lett,2012,100:134103.