Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses
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丝状不稳定性对超强激光脉冲驱动的相对论电子发散的影响

DOI:
10.1063/1.4966205
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发表时间:
2016-10
期刊:
影响因子:
2.2
通讯作者:
Ma, Y. Y.
Ma, Y. Y.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ge, Z. Y.;Shao, F. Q.;Borghesi, M.;Ma, Y. Y.

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通过粒子碰撞模拟研究了超强激光脉冲与等离子体靶相互作用过程中相对论电子束的产生。碰撞等离子体中的丝化不稳定性产生了一个横向尺度长度为几个局部等离子体皮深度的强磁场,与目标中的RE电流传播有关,与无碰撞情况相比,导致REs发散度大大增强。这种效应随着激光强度和靶电荷状态的增加而增加,这表明在未来的快速点火实验和其他激光驱动电子束的应用中,可以通过在适当的激光强度下使用低z材料来改善RE散度。
Generation of relativistic electron (RE) beams during ultraintense laser pulse interaction with plasma targets is studied by collisional particle-in-cell simulations. A strong magnetic field with a transverse scale length of several local plasma skin depths, associated with RE current propagation in the target, is generated by filamentation instability in collisional plasmas, inducing a great enhancement of the divergence of REs compared to that of collisionless cases. Such an effect is increased with laser intensity and target charge state, suggesting that the RE divergence might be improved by using low-Z materials under appropriate laser intensities in future fast ignition experiments and in other applications of laser-driven electron beams.
强激光脉冲在强磁化等离子体中的传播
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