多拍瓦laser -QED体系的电离态
Ionization states for the multi-petawatt laser-QED regime
摘要：
随着世界范围内多拍瓦激光装置的投入使用，激光-等离子体相互作用物理学的范式正在发生转变。辐射反应过程将导致电子-正电子对级联的开始，并且随之导致入射激光能量的吸收和分配，以及能量在整个被照射目标中的传输。为了准确地量化这些效果，必须知道原位目标上的聚焦强度。本文提出了一种基于低气压下氘气电离的靶面聚焦光强测量方法。来自Phys.Rev.A59，569（1999）和来自Phys.Rev.A98，043407（2018）的场电离率，其中后者的速率是使用量子力学导出的，已经首次在粒子细胞代码SMILEI中实现[COMPUT.物理通讯222，351-373（2018）]。一系列的一维和二维模拟进行了比较，并显示重现电荷状态，而不会出现明显的差异时，增加模拟维数。这为利用现场测量准确验证目标上的强度提供了一种新的方法
英文摘要：
A paradigm shift in the physics of laser-plasma interactions is approaching with the commissioning of multi-petawatt laser facilities world-wide. Radiation reaction processes will result in the onset of electron-positron pair cascades and, with that, the absorption and partitioning of the incident laser energy, as well as the energy transport throughout the irradiated targets. To accurately quantify these effects, one must know the focused intensity on target in-situ. In this work, a new way of measuring the focused intensity on target is proposed based upon the ionization of Xe gas at low ambient pressure. The field ionization rates from Phys. Rev. A 59, 569 (1999) and from Phys. Rev. A 98, 043407 (2018), where the latter rate has been derived using quantum mechanics, have been implemented for the first time in the particle-in-cell code SMILEI [Comput. Phys. Commun. 222, 351-373 (2018)]. A series of one- and two-dimensional simulations are compared and shown to reproduce the charge states without presenting visible differences when increasing the simulation dimensionality. They provide a new way to accurately verify the intensity on target using in-situ measurements
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