High field suppression of bremsstrahlung emission in high-intensity laser–plasma interactions
High field suppression of bremsstrahlung emission in high-intensity laser–plasma interactions
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DOI：
10.1063/5.0167288
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发表时间：
2023-10
影响因子：
2.2
通讯作者：
M. Habibi;A. Arefiev;T. Toncian
中科院分区：
文献类型：
--
作者：
M. Habibi;A. Arefiev;T. Toncian
据预测，高强度激光与等离子体的相互作用将产生极强的准静态磁场，其量级接近兆瓦级。在相对论透明的等离子体中，这些场可以增强激光的直接加速，并允许加速的电子有效地发射伽马射线。然而，由于所谓的磁抑制效应，磁场也可以影响辐射电子的轨迹，从而降低韧致辐射的发射几率。这是第一次在高强度激光-等离子体相互作用的背景下研究韧致辐射抑制机制的研究。本文描述了一个新的模块，通过考虑磁场的影响，并将分析扩展到电场，将抑制效应集成到新纪元粒子-单元代码的标准韧致辐射模块中。我们还研究了这种抑制机制对发射电子动力学的影响。我们的发现表明，这种机制不仅抑制了低能发射，而且还对辐射电子的动力学产生了影响。
The interaction of high-intensity lasers with plasma is predicted to produce extreme quasi-static magnetic fields with magnitudes approaching Megatesla levels. In relativistically transparent plasmas, these fields can enhance direct laser acceleration and allow efficient gamma-ray emission by accelerated electrons. However, due to the so-called magnetic suppression effect, the magnetic field can also affect radiating electron trajectories and, thus, reduce the emission probability of the bremsstrahlung. This is the first study to examine the bremsstrahlung suppression mechanism in the context of high-intensity laser–plasma interactions. Our paper describes a new module that integrates the suppression effect into the standard bremsstrahlung module of the EPOCH particle-in-cell code by considering the impact of magnetic fields and extending the analysis to electric fields. We also investigate this suppressing mechanism's effect on the emitting electron's dynamics. Our findings show that this mechanism not only suppresses low-energy emissions but also has an impact on the dynamics of the radiating electrons.