New Estimation of the Curvature Effect for the X-ray Vacuum Diffraction Induced by an Intense Laser Field
New Estimation of the Curvature Effect for the X-ray Vacuum Diffraction Induced by an Intense Laser Field
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强激光场引起的X射线真空衍射曲率效应的新估计
DOI：
10.1093/ptep/ptaa084
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发表时间：
2020
影响因子：
3.5
通讯作者：
S. Asai
中科院分区：
文献类型：
--
作者：
Y. Seino;T. Inada. T. Yamazaki;T. Namba;S. Asai
量子电动力学预言了在高强度激光场下通过虚带电粒子的X射线衍射，这种现象被称为真空衍射（VD）。本文导出了一个新的公式，用以描述X射线自由电子激光（XFEL）脉冲与激光脉冲迎头碰撞几何中的VD。该公式新考虑了XFEL脉冲波前曲率的影响。利用这个公式，我们还讨论了曲率对真空度色散信号的影响。
Quantum electrodynamics predicts X-ray diffractions under a high-intensity laser field via virtual charged particles, and this phenomenon is called vacuum diffraction (VD). In this paper, we derive a new formula to describe VD in a head-on collision geometry of an X-ray free-electron laser (XFEL) pulse and a laser pulse. The wavefront curvature of the XFEL pulse is newly considered in this formula. With this formula, we also discuss the curvature effect on VD signals based on realistic parameters at the SACLA XFEL facility.