An Integrated Simulation Tool for Dark Current Radiation Effects Using ACE3P and Geant4

TL;DR

This paper develops an integrated simulation workflow combining ACE3P and Geant4 to model dark current radiation effects in accelerator structures, aiming for benchmarking against experimental data and applications in future collider designs.

Contribution

It introduces a novel interface between ACE3P and Geant4 for simulating dark current effects, enabling large-scale and more accurate radiation effect studies in accelerator components.

Findings

ACE3P simulations agree with CST results at 21.8 MV/m.

Particle data transfer between ACE3P and Geant4 has been implemented.

Workflow demonstrated for KEK 56-cell structure simulations.

Abstract

A simulation workflow is under development to interface particle data transfer and matching of geometry between the electromagnetic (EM) cavity simulation code ACE3P and radiation code Geant4. The target is to simulate dark current (DC) radiation effects for the KEK 56-cell S-band accelerating structure using ACE3P and Geant4, and benchmark against KEK experiment data. As a first step, ACE3P DC simulations using a 7-cell structure have been performed by first calculating the operating mode in the structure and then tracking field-emitted electrons under the influence of the EM fields of the mode. The ACE3P simulation results agree well with the EM software CST for an accelerating gradient of 21.8 MV/m. The reader/writer I/O in ACE3P and the transfer of particle data from Track3P to Geant4 for DC radiation effects studies have been implemented. The simulation workflow between the two codes will be demonstrated with the goal of performing large-scale simulations for the KEK 56-cell structure. In addition to modeling DC effects in linacs, the integrated simulation workflow will be applicable to studying positron source and capture structure for future lepton colliders.