Parallel Computation of Inverse Compton Scattering Radiation Spectra based on Li\'enard-Wiechert Potentials

TL;DR

This paper introduces a parallelized time-domain simulation method for inverse Compton scattering radiation spectra, offering a potentially more efficient alternative to traditional frequency-domain approaches for designing X-ray light sources.

Contribution

It develops and analyzes a novel time-domain computational approach for ICS radiation spectra, including parallelization strategies and performance comparison with existing methods.

Findings

The time-domain method can outperform the frequency-domain method under certain conditions.

Parallelization schemes significantly improve computational efficiency.

The method provides accurate radiation spectra predictions for X-ray source design.

Abstract

Inverse Compton Scattering (ICS) has gained much attention recently because of its promise for the development of table-top-size X-ray light sources. Precise and fast simulation is an indispensable tool for predicting the radiation property of a given machine design and to optimize its parameters. Instead of the conventional approach to compute radiation spectra which directly evaluates the discretized Fourier integral of the Li\'enard-Wiechert field given analytically (referred to as the frequency-domain method), this article focuses on an approach where the field is recorded along the observer time on a uniform time grid which is then used to compute the radiation spectra after completion of the simulation, referred to as the time-domain method. Besides the derivation and implementation details of the proposed method, we analyze possible parallelization schemes and compare the parallel performance of the proposed time-domain method with the frequency-domain method. We will characterize scenarios/conditions under which one method is expected to outperform the other.