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

• Main Authors: Kan, Yi-Kai, Kärtner, Franz X, Borne, Sabine Le, Ruprecht, Daniel, Zemke, Jens-Peter M
• Format: Journal Article
• Language: English
• Published: 07.06.2022
• Subjects: Physics - Accelerator Physics; Physics - Computational Physics
• DOI: 10.48550/arxiv.2206.03015

Journal of Computational Physics: 473, pp. 107876, 2023 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.