论文标题
通过激光 - 血浆互动产生高偏振的高能辉煌$γ$-
Generation of highly-polarized high-energy brilliant $γ$-rays via laser-plasma interaction
论文作者
论文摘要
已经在量子辐射反应方案中研究了通过激光 - 血浆相互作用来产生高偏振的高能辉煌$γ$ -DRAY。我们采用量子 - 电动力学粒子中的粒子代码来描述旋转分辨的电子动力学，并在局部恒定场近似中机械地用光子发射和极化量子来描述。 As an ultrastrong linearly-polarized (LP) laser pulse irradiates on a near-critical-density (NCD) plasma followed by an ultrathin planar aluminum target, the electrons in NCD plasma are first accelerated by the driving laser to ultrarelativistic energies, and then head-on collide with reflected laser pulse by the aluminum target, emitting brilliant LP $γ$ - 由于非线性康普顿散射，平均极化约为70 \％，能量高达数百个MEV。相比之下，由于采用了充满NCD等离子体的圆锥黄金靶标，因此由于增强的强大激光驱动的准静态磁场，发射$γ$ -Ray束的线性极化程度，准确性和光彩都得到了显着改善。这种$γ$ - 砂可以使用目前可实现的激光设施生产，并在高能物理和天体物理学中找到各种应用。
Generation of highly-polarized high-energy brilliant $γ$-rays via laser-plasma interaction has been investigated in the quantum radiation-reaction regime. We employ a quantum-electrodynamics particle-in-cell code to describe spin-resolved electron dynamics semiclassically and photon emission and polarization quantum mechanically in the local constant field approximation. As an ultrastrong linearly-polarized (LP) laser pulse irradiates on a near-critical-density (NCD) plasma followed by an ultrathin planar aluminum target, the electrons in NCD plasma are first accelerated by the driving laser to ultrarelativistic energies, and then head-on collide with reflected laser pulse by the aluminum target, emitting brilliant LP $γ$-rays due to nonlinear Compton scattering with an average polarization of about 70\% and energy up to hundreds of MeV. By comparison, as a conical gold target filled with NCD plasma is employed, the linear polarization degree, collimation and brilliance of emitted $γ$-ray beam are all significantly improved due to the enhanced strong laser-driven quasi-static magnetic field in plasmas. Such $γ$-rays can be produced with currently achievable laser facilities and find various applications in high-energy physics and astrophysics.
