New Estimation of the Curvature Effect for the X-ray Vacuum Diffraction Induced by an Intense Laser Field

TL;DR

This paper introduces a new formula for vacuum diffraction in high-intensity laser fields, incorporating wavefront curvature effects, and analyzes its impact on experimental signals at XFEL facilities.

Contribution

The paper presents a novel formula for vacuum diffraction that accounts for wavefront curvature, advancing theoretical understanding of laser-induced x-ray phenomena.

Findings

Wavefront curvature significantly affects vacuum diffraction signals.

The new formula aligns with realistic parameters at SACLA XFEL.

Curvature effects can enhance or diminish diffraction signals.

Abstract

Quantum electrodynamics predicts x-ray diffractions under a high-intensity laser field via virtual charged particles, and this phenomenon is called as vacuum diffraction (VD). In this paper, we derive a new formula to describe VD in a head-on collision geometry of an XFEL pulse and a laser pulse. A 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 SACLA XFEL facility.