Aperture limitation localization using beam position and beam loss monitor measurements

TL;DR

This paper introduces a method for localizing beam losses in circular electron accelerators by sequentially moving scintillator-based beam loss monitors, achieving sub-meter resolution and validated through experiments at VEPP-4M.

Contribution

The paper presents a novel sequential BLM placement technique for precise beam loss localization in electron accelerators, enhancing detection accuracy.

Findings

Achieved sub-meter spatial resolution in beam loss localization.

Validated the method with experimental results at VEPP-4M.

Calibrated BLMs using a Sr-90 radioactive source.

Abstract

The efficiency of beam injection in circular accelerators can be impacted by unknown aperture limitations in the vacuum chamber. These limitations can be detected by introducing localized distortions to the closed orbit of the circulating beam observed at beam position monitors (BPMs). The localized nature of introduced closed orbit distortions enables targeted identification of loss regions. In this paper, we present a method for localizing beam losses designed primarily for circular electron accelerators using a set of sequentially placed scintillator-based beam loss monitors (BLMs). By moving these monitors along the accelerator lattice, the proposed technique achieves sub-meter spatial resolution in beam loss localization. Relative calibration of the BLMs was performed using a strontium-90 radioactive source. We report experimental results from the implementation of this method at the VEPP-4M collider.