Retrieving Transient Magnetic Fields of Ultrarelativistic Laser Plasma via Ejected Electron Polarization,Physical Review Letters

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Retrieving Transient Magnetic Fields of Ultrarelativistic Laser Plasma via Ejected Electron Polarization
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-12 , DOI: 10.1103/physrevlett.127.165002
Zheng Gong ₁ , Karen Z Hatsagortsyan ₁ , Christoph H Keitel ₁

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Interaction of an ultrastrong short laser pulse with nonprepolarized near-critical density plasma is investigated in an ultrarelativistic regime, with an emphasis on the radiative spin polarization of ejected electrons. Our particle-in-cell simulations show explicit correlations between the angle resolved electron polarization and the structure and properties of the transient quasistatic plasma magnetic field. While the magnitude of the spin signal is the indicator of the magnetic field strength created by the longitudinal electron current, the asymmetry of electron polarization is found to gauge the islandlike magnetic distribution which emerges due to the transverse current induced by the laser wave front. Our studies demonstrate that the spin degree of freedom of ejected electrons could potentially serve as an efficient tool to retrieve the features of strong plasma fields.

中文翻译：

通过发射电子极化获取超相对论激光等离子体的瞬态磁场

在超相对论体系中研究了超强短激光脉冲与非预极化近临界密度等离子体的相互作用，重点是喷射电子的辐射自旋极化。我们的细胞内粒子模拟显示了角度解析电子极化与瞬态准静态等离子体磁场的结构和特性之间的明确相关性。虽然自旋信号的大小是纵向电子流产生的磁场强度的指标，但发现电子极化的不对称性可以衡量由于激光波前感应的横向电流而出现的岛状磁分布。

更新日期：2021-10-12

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