Injection Feedback for a Storage Ring

TL;DR

This paper presents an injection feedback scheme for the ThomX storage ring, utilizing an analytic correction code and simulations to achieve high-precision beam injection with minimal oscillations.

Contribution

The paper introduces a novel analytic feedback algorithm for beam injection in a storage ring, validated through simulations to improve accuracy and efficiency.

Findings

Achieves beam position accuracy of a few hundred micrometers.

Converges within less than 50 iterations in simulations.

Demonstrates effectiveness of feedback system for ThomX storage ring.

Abstract

We report on an injection feedback scheme for the ThomX storage ring project. ThomX is a 50-MeV-electron accelerator prototype which will use Compton backscattering in a storage ring to generate a high flux of hard X-rays. Given the slow beam damping (in the ring), the injection must be performed with high accuracy to avoid large betatron oscillations. A homemade analytic code is used to compute the corrections that need to be applied before the beam injection to achieve a beam position accuracy of a few hundred micrometers in the first beam position monitors (BPMs). In order to do so the code needs the information provided by the ring's diagnostic devices. The iterative feedback system has been tested using MadX simulations. Our simulations show that a performance that matches the BPMs' accuracy can be achieved in less than 50 iterations in all cases. Details of this feedback algorithm, its efficiency and the simulations are discussed.