超强激光脉冲下等离子体块的整体加速研究
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摘要
为了克服激光加速中强流离子束空间电荷效应对粒子输运的影响,提出一种利用两块不同密度的固体靶先后和一束强度约为1022 W/cm2、脉冲长度为5T(T为激光周期)的超强脉冲激光相互作用的方案,实现了中性等离子体块的加速。通过一维PIC数值模拟研究发现,在合适的参数下,加速后的电子与质子几乎以相同的速度共同飞行长达60λ(λ为激光波长)的距离,其中质子与电子的能量分别为GeV和100MeV量级。
In order to overcome the space charge influence over the transport of the high-current particle beams in laser acceleration,we propose a new scheme to realize the acceleration of a neutral plasma block.It is carried out by injecting an ultraintense laser pulse with intensity about 1022 W/cm2 and pulse duration about 5T(Tis laser period)upon two thin solid-density plasma blocks.By optimizing the plasma parameters,we have obtained an accelerated plasma block,which is almost neutral and propagates for a quite long distance in the space.The ion and electron energies are of GeV and 100 MeV magnitude respectively.
In order to overcome the space charge influence over the transport of the high-current particle beams in laser acceleration,we propose a new scheme to realize the acceleration of a neutral plasma block.It is carried out by injecting an ultraintense laser pulse with intensity about 1022 W/cm2 and pulse duration about 5T(Tis laser period)upon two thin solid-density plasma blocks.By optimizing the plasma parameters,we have obtained an accelerated plasma block,which is almost neutral and propagates for a quite long distance in the space.The ion and electron energies are of GeV and 100 MeV magnitude respectively.
引文
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[11]Qiao B,Karl S,Geissler M,et al.Stable GeV ion-beam acceleration from thin foils by circularly polarized laser pulses[J].Phys Rev Lett,2009,102:145002.
[12]Chen M,Pukhov A,Yu T P,et al.Enhanced collimated GeV monoenergetic ion acceleration from a shaped foil target irradiated by a circularly polarized laser pulse[J].Phys Rev Lett,2009,103:024801.
[13]Hora H.Contributions on laser driven inertial confinement fusion[J].Am J Appl Sci,2005,2(6):1085-1094.
[2]Esarey E,Schroeder C B,Leemans W P.Physics of laser-driven plasma-based electron accelerators[J].Rev Mod Phys,2008,81(3):1229-1285.
[3]Clark E L,Krushelnick K,Davies J R,et al.Measurements of energetic proton transport through magnetized plasma from intense laser interactions with solids[J].Phys Rev Lett,2000,84(4):670-673.
[4]Snavely R A,Key M H,Hatchett S P,et al.Intense high-energy proton beams from petawatt-laser irradiation of solids[J].Phys Rev Lett,2000,85(14):2945-2948.
[5]李勇,洪伟,吴玉迟,等.超薄靶激光质子加速实验研究[J].强激光与粒子束,2010,22(5):1001-1004.(Li Yong,Hong Wei,Wu Yuchi,et al.Experimental study of laser-driven proton acceleration with ultrathin targets.High Power Laser and Particle Beams,2010,22(5):1001-1004)
[6]Macchi A,Cattani F,Liseykina T V,et al.Laser acceleration of ion bunches at the front surface of overdense plasmas[J].Phys Rev Lett,2005,94:165003.
[7]Robinson A P L,Zepf M,Kar S,et al.Radiation pressure acceleration of thin foils with circularly polarized laser pulses[J].New J Phys,2008,10:013021.
[8]祝娇,符合振,林晨,等.激光加速实验超薄类金刚石碳靶的制备[J].强激光与粒子束,2013,25(7):1723-1726.(Zhu Jiao,Fu Hezhen,Lin Chen,et al.Preparation of ultra-thin DLC target for laser ion acceleration.High Power Laser and Particle Beams,2013,25(7):1723-1726)
[9]Bake M A,Shan Z,Xie B,et al.Energy enhancement of proton acceleration in combinational radiation pressure and bubble by optimizing plasma density[J].Physics of Plasmas,2012,19:083103.
[10]Macchi A,Veghini S,Pegoraro F.“Light Sail”acceleration reexamined[J].Phys Rev Lett,2009,103:085003.
[11]Qiao B,Karl S,Geissler M,et al.Stable GeV ion-beam acceleration from thin foils by circularly polarized laser pulses[J].Phys Rev Lett,2009,102:145002.
[12]Chen M,Pukhov A,Yu T P,et al.Enhanced collimated GeV monoenergetic ion acceleration from a shaped foil target irradiated by a circularly polarized laser pulse[J].Phys Rev Lett,2009,103:024801.
[13]Hora H.Contributions on laser driven inertial confinement fusion[J].Am J Appl Sci,2005,2(6):1085-1094.