The effects of injection beam parameters and foil scattering for CSNS/RCS

TL;DR

This paper investigates how injection beam parameters and foil scattering affect beam quality and losses in the CSNS/RCS, providing optimized parameters and insights into foil interactions for improved accelerator performance.

Contribution

It offers a detailed simulation study of injection beam parameters and foil scattering effects, proposing optimized ranges and foil thickness for the CSNS/RCS.

Findings

Optimized injection beam parameters to minimize losses.

Determined suitable foil thickness for high stripping efficiency.

Analyzed energy deposition and beam losses due to foil scattering.

Abstract

The China Spallation Neutron Source (CSNS) uses H- stripping and phase space painting method to fill large ring acceptance with the linac beam of small emittance. The dependence of the painting beam on the injection beam parameters was studied for the Rapid Cycling Synchrotron (RCS) of CSNS. The injection processes for different momentum spread, rms emittance of the injection beam, injection beam matching were simulated, then the beam losses, 99% and rms emittances were obtained and the optimized ranges of injection beam parameters were given. The interaction between the H- beam and the stripping foil was studied and the foil scattering was simulated. Then, the stripping efficiency was calculated and the suitable thickness of the stripping foil was obtained. The energy deposition on the foil and the beam losses due to the foil scattering were also studied.