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首页> 外文期刊>Physics of plasmas >Improvement of proton acceleration via collisionless shock acceleration by laser-foil interaction with an external magnetic field
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Improvement of proton acceleration via collisionless shock acceleration by laser-foil interaction with an external magnetic field

机译：通过与外部磁场的激光箔相互作用通过碰撞冲击加速改善质子加速度

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摘要

Effects of the external intense axial magnetic field on collisionless shock acceleration (CSA) are investigated by using two-dimensional particle-in-cell simulations. Proton beams accelerated by CSA show different properties when left-hand circularly polarized (LHCP) or right-hand circularly polarized (RHCP) lasers are individually applied to a foil target with or without the magnetic field. It can be attributed to the difference of the dispersion relationship for the laser propagating in a plasma. Protons achieve more efficient acceleration when magnetized plasma is irradiated by the RHCP laser compared with the LHCP laser. Furthermore, the effect of different amplitudes of the magnetic field is studied numerically. It shows that the induced electrostatic charge-separation field arises deep in the target with huge strength of the magnetic field. Protons in the upstream are accelerated before the shock arrives, leading to less efficient acceleration. As a result, an appropriate magnetic field should be applied to enhance the CSA regime.
机译：通过使用二维粒子内仿真研究了外部强轴磁场对碰撞冲击加速度（CSA）的影响。当左手圆极化（LHCP）或右手圆偏振（RHCP）激光器单独施加到有或没有磁场的箔靶中时，CSA加速的质子束显示出不同的性质。它可以归因于在等离子体中传播的激光的分散关系的差异。当RHCP激光器与LHCP激光器相比，质子率达到磁化等离子体时达到更有效的加速度。此外，数值研究了磁场的不同幅度的效果。结果表明，诱导的静电电荷分离场在靶磁场强度的巨大强度下深度产生。在震动到达之前，上游的质子在上游加速，导致效率较低。结果，应应用适当的磁场以增强CSA制度。

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