Beam Dynamics simulations for ERDC project -- SRF linac for industrial use

TL;DR

This paper presents beam dynamics simulations for an ERDC project involving a compact, conductively cooled SRF industrial linac capable of delivering up to 10MeV and 1MW, focusing on the design and optimization of the RF injector and beam transport.

Contribution

It introduces a novel RF injector design with a thermal RF gridded gun integrated into the first cell of multi-cell cavities, and compares simulation results from MICHELLE and ASTRA software for validation.

Findings

Beam energy reaches ~250 keV at the injector exit.

Short solenoid effectively regulates transverse beam size.

Simulation results from MICHELLE and ASTRA are consistent in initial cells.

Abstract

Compact conductively cooled SRF industrial linacs can provide unique parameters of the electron beam for industrial applications. (up to 10MeV, 1MW). For ERDC project we designed normal conducting RF injector with thermal RF gridded gun integrated in first cell of multi-cell cavities. For design of the RF gun we used MICHELLE software to simulate and optimize parameters of the beam. Output file was converted to ASTRA format and most beam dynamic simulations in multi-cell normal conducting cavity and cryomodule were performed by using ASTRA software. For cross-checking we compare results of MICHELLE and AS-TRA in first few cells. At the end of injector beam reach ~250keV energy which allow to trap bunch in acceleration regime without losses in TESLA like 1.3 GHz cavity. Short solenoid at the end of injector allow to regulate transverse beam size in cryomodule to match beam to extraction system and also reduce charge losses in accelerator.