Optimization of the Multi-turn Injection Efficiency for Medical Synchrotron

TL;DR

This paper introduces an optimization method for multi-turn injection efficiency in medical synchrotrons, focusing on tune selection, injection bump, and turn count, validated on the KHIMA synchrotron with simulation tools.

Contribution

It presents a novel approach combining frequency map analysis and particle tracking to optimize injection parameters for improved efficiency in medical synchrotrons.

Findings

Injection efficiency can be significantly improved by tune selection.

Optimized injection bump and turn count enhance beam capture.

Method successfully applied to the KHIMA synchrotron.

Abstract

We present a method for optimization of the multi-turn injection effciency for medical synchrotron. We show that for given injection energy the injection efficiency can be greatly enhanced by choosing transverse tunes appropriately as well as optimizing the injection bump and the number of turns required for beam injection. We verify our study by applying the method to the Korea Heavy Ion Medical Accelerator (KHIMA) synchrotron which is currently built at the campus of Dongnam Institute of Radiological and Medical Sciences (DIRAMS) in Busan, Korea. First the frequency map analysis is performed with the help of ELEGANT and ACCSIM codes. The tunes which yield the good injection efficiency are then selected. With these tunes the injection bump and the number of turns required for injection are then optimized by tracking a number of particles up to one thousand turns after injection beyond which there is no further beam loss. Results for optimization of the injection efficiency for proton ion are presented.