Closed orbit correction of HIMM synchrotron

TL;DR

This paper discusses the design and simulation of a closed orbit correction system for the HIMM synchrotron, emphasizing the placement of BPMs and correctors, and analyzing the impact of magnet alignment errors.

Contribution

It proposes specific strategies for BPM placement and corrector positioning, and highlights the significance of dipole magnet alignment errors in orbit correction accuracy.

Findings

Proper placement of BPMs at betatron oscillation peaks improves correction accuracy.

Large longitudinal alignment errors in dipole magnets significantly affect horizontal correction results.

Reducing alignment errors enhances the effectiveness of the orbit correction system.

Abstract

The correction of closed orbit has great influence on the operation of synchrotron. The design of correction system is one significant component of lattice design. It is suggested to set BPMs at the peaks of betatron oscillation. The correctors need to be located at the positions where \b{eta} function is large or the sources of large errors. In the simulation of the closed orbit correction of HIMM synchrotron, one important reason affecting the result of horizontal correction is the longitudinal alignment error of dipole magnet. It is advisable to decrease this kind of alignment error while the deflection angle of dipole magnet is large.