THPM061

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URL	https://doi.org/10.18429/JACoW-IPAC2025-THPM061
Title	Cavity beam position monitor signal matching by injection pulse
Authors	M. McCallum John Adams Institute A. Aryshev, K. Popov, N. Terunuma High Energy Accelerator Research Organization A. Lyapin, G. Boorman John Adams Institute for Accelerator Science K. Kruchinin High Energy Accelerator Research Organization, SLAC National Accelerator Laboratory S. Gibson Royal Holloway University of London
Abstract	Cavity beam position monitors (CBPMs) are very high-precision devices that, in recent years, have progressed from experimental equipment to standard linac diagnostics in many prominent facilities, most notably free electron lasers. However, the high sensitivity of these devices comes at the cost of a limited measurement range, even with high dynamic range electronics. Furthermore, CBPMs need to be calibrated in situ, ideally by introducing a known beam offset, which is often impractical in large installations. This paper reports on a method to match CBPM beam signals by injecting synchronized and tightly controlled bursts of radio frequency (RF) oscillations into the sensor cavity and reading back their superposition. The method allows compensation for static beam offsets (with beam) and calibrates CBPMs electronically (no beam required), thus removing some of the operational hurdles. We discuss the first demonstration of this method at the Accelerator Test Facility 2 (ATF2).
Paper	download: THPM061.pdf
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Conference	16th International Particle Accelerator Conference
Series
Location	Taipei, Taiwan
Date	01-06 Jun 2025
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	* Ming-Chyuan Lin - National Synchrotron Radiation Research Center * Yoichi Sato - KEK * Jui-Che Huang - National Synchrotron Radiation Research Center * David Button - Australian Nuclear Science and Technology Organisation * Ping-Shun Chuang - National Synchrotron Radiation Research Center
Online ISBN	978-3-95450-248-6
Online ISSN	2673-5490
Received	30 May 2025
Revised	06 June 2025
Accepted	06 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-THPM061
Pages	2814-2817
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.