Residual orbit of BC bump for CSNS/RCS

TL;DR

This paper presents a measurement and correction method for residual orbit distortion caused by BC bump imperfections in the CSNS/RCS, improving injection stability during beam commissioning.

Contribution

It introduces a novel measurement and correction approach for residual orbit in BC bump, validated through simulation and practical application.

Findings

Residual orbit is manageable and can be corrected effectively.

The proposed method improves orbit correction during beam commissioning.

Simulation and experimental results confirm the method's effectiveness.

Abstract

In a beam cycle, there is a chicane bump (BC bump) in the injection region of China Spallation Neutron Source (CSNS). It is a core part of the injection system and the important guarantee that the Linac beam injecting into the rapid cycling synchrotron (RCS). During the beam commissioning, the residual orbit of BC bump, i.e. the closedorbit distortion (COD) due to the imperfect BC bump, was an important problem which can affect the orbit correction and beam loss control of the RCS. In this paper, a method to measure the residual orbit of BC bump was studied and given. By using the three auxiliary powers of BC magnets, a method to correct the residual orbit of BC bump was developed. The numerical simulation results showed that the measurement and correction methods had worked well and they can be applied to the beam commissioning of CSNS/RCS. The measurement results in the machine study showed that the residual orbit of BC bump is not large and can be corrected by the three auxiliary powers of BC magnets.