Integrated simulation of cavity design and radiation transport codes (ACE3P + Geant4)

TL;DR

This paper presents an integrated simulation workflow combining ACE3P and Geant4 to study dark current radiation effects in accelerator structures, enabling large-scale high-performance computing applications.

Contribution

The work introduces a novel integrated simulation workflow that couples electromagnetic cavity modeling with radiation transport for large-scale accelerator studies.

Findings

Successful demonstration on KEK structure

Efficient large-scale simulations on NERSC Perlmutter

Enhanced understanding of dark current radiation effects

Abstract

A simulation workflow has been developed to study dark current (DC) radiation effects using ACE3P and Geant4. The integrated workflow interfaces particle data transfer and geometry between the electromagnetic (EM) cavity simulation code ACE3P and the radiation code Geant4, targeting large-scale problems using high-performance computing. The process begins by calculating the operating mode in the vacuum region of an accelerator structure and tracking field-emitted electrons influenced by the EM fields of the mode calculated by ACE3P. It then transfers particle data at the vacuum-wall interface for subsequent radiation calculations within the wall enclosure materials through Geant4 calculation. The whole integrated simulation workflow will be demonstrated through large-scale dark current radiation calculations for the KEK 56-cell traveling-wave structure, and the efficiency of performing these simulations on the NERSC supercomputer Perlmutter will be presented.