Compact beam position monitor using a segmented toroidal coil

TL;DR

This paper introduces a compact beam position monitor utilizing a segmented toroidal coil that detects induced voltages, offering a potentially more sensitive and smaller alternative to traditional charge-based monitors.

Contribution

It presents a novel coil-based design for beam position monitoring, with theoretical analysis and experimental validation demonstrating its effectiveness and potential for enhanced sensitivity.

Findings

Achieved a resolution of about 5 micrometers in one second for 0.5 mA beam current.

Identified a resonant frequency response that can be exploited to improve sensitivity.

Validated the coil response through laboratory and storage ring measurements.

Abstract

A new, compact beam position monitor based on segmented a toroidal coil surrounding the charged particle beam has been investigated. It makes use of the induced voltages in the windings instead of the induced charge imbalance on capacitor plates in the conventional beam position monitors. We theoretically investigate the response of the coils to the bunched particle beam based on a lumped element model and compare it with measurements in the laboratory and in the storage ring COSY, in terms of beam displacement. As to the frequency response of the coils, we find a resonant behavior, which may be exploited to increase the sensitivity of the device further. The resolution presently achieved is about 5 micrometer in a one second time interval for a beam current of 0.5 mA.