Study on the transverse painting during the injection process for CSNS/RCS

TL;DR

This paper investigates the effects of different transverse painting methods and ranges during injection in the CSNS/RCS, aiming to optimize beam accumulation considering hardware limitations.

Contribution

It analyzes various painting strategies using simulation tools to determine optimal ranges and methods for high-intensity beam injection in CSNS/RCS.

Findings

Optimal painting range depends on aperture and magnet gap.

Painting method selection mitigates effects of field non-uniformity.

Simulation results guide practical injection process improvements.

Abstract

For the China Spallation Neutron Source (CSNS), a combination of the H- stripping and phase space painting method is used to accumulate a high intensity beam in the Rapid Cycling Synchrotron (RCS). In this paper, firstly, the injection processes with different painting ranges and different painting methods were studied. With the codes ORBIT and MATLAB, the particle distribution and painting image were obtained. Then, the reasonable painting range which is suitable for the aperture size and magnet gap can be selected. Since the real field uniformity of BH3 and BV3 is not completely in conformity with the design requirement, the painting method and painting range also need to be selected to reduce the effects of bad field uniformity.