Reducing current loss of laser-driven fast electron beams propagating in solid-density plasmas

Reducing current loss of laser-driven fast electron beams propagating in solid-density plasmas
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减少激光驱动的快速电子束在固体密度等离子体中传播的电流损耗

DOI:
10.1063/1.3116728
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发表时间:
2009-04
影响因子:
3.2
通讯作者:
S.Z.Wu
S.Z.Wu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
C.T.Zhou;X.T.He;J.M.Cao;X.G.Wang;S.Z.Wu

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提出了一种减小激光驱动高能电子束在固体密度靶中传输的电流损耗的方案。在该方案中,两个强激光脉冲照射由两种材料组成的固体靶,一个包围另一个。由于材料界面处的电阻率和密度梯度,第一脉冲产生数十兆高斯的稳健界面磁场,其可显著减小由第二脉冲产生的电子束的发散。结果表明,用同轴金铝靶代替简单的金靶,束流损失可降低30%左右。
A scheme to reduce the current loss of laser-driven energetic electron beams propagating in solid-density targets is proposed. In the scheme, two intense laser pulses irradiate the solid target consisting of two materials, one enveloping the other. Because of the resistivity and density gradients at the material interface, the first pulse generates tens of megagauss robust interface magnetic fields that can considerably reduce the divergence of the electron beam generated by the second pulse. It is shown that by using a coaxial gold-aluminum target instead of a simple gold target, beam current loss can be lowered by about 30%.
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