Comparison of WarpX and GUINEA-PIG for electron positron collisions

TL;DR

This paper compares WarpX and GUINEA-PIG simulation codes for electron-positron collisions, highlighting WarpX's speed advantage and potential for more accurate modeling of high-energy collider phenomena.

Contribution

It provides the first benchmarking of WarpX against GUINEA-PIG for beam-beam collision simulations, demonstrating WarpX's efficiency and modeling capabilities.

Findings

WarpX achieves significantly faster simulation times.

WarpX produces comparable luminosity and photon spectra to GUINEA-PIG.

WarpX's self-consistent treatment of pair production enhances modeling accuracy.

Abstract

As part of the Snowmass'21 planning exercise, the Advanced Accelerator Concepts community proposed developing multi-TeV linear colliders and considered beam-beam effects for these machines. Such colliders operate under a high disruption regime with an enormous number of electron-positron pairs produced from QED effects. Thus, it requires a self-consistent treatment of the fields produced by the pairs, which is not implemented in state-of-the-art beam-beam codes such as GUINEA-PIG. WarpX is a parallel, open-source, and portable particle-in-cell code with an active developer community that models QED processes with photon and pair generation in relativistic laser-beam interactions. However, its application to beam-beam collisions has yet to be fully explored. In this work, we benchmark the luminosity spectra, photon spectra, and coherent production process from WarpX against GUINEA-PIG in the ILC and ultra-tight collision scenarios. Our performance comparison demonstrates a significant speed-up advantage of WarpX, ensuring a more robust and efficient modeling of electron-positron collisions at multi-TeV energies.