Analysis of a phase modulated interferometric Electro-Optic BPM at the CERN SPS

Max Bosman; Stephen Gibson; Alberto Arteche; Daniel Harryman; Thibaut Lefevre; Tom Levens

doi:10.18429/JACoW-IBIC2025-WEAC01

Analysis of a phase modulated interferometric Electro-Optic BPM at the CERN SPS

Max Bosman
, Stephen Gibson
, Alberto Arteche
, Daniel Harryman
, Thibaut Lefevre
, Tom Levens

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The Electro-Optic Beam Position Monitor (EO-BPM) is a new diagnostic tool being developed to enhance the intra-bunch transverse beam position monitoring in the High Luminosity LHC at CERN. This EO-BPM has been installed in the Super Proton Synchrotron (SPS) since 2024. The Pockels effect in lithium niobate crystals is exploited to detect the propagating electric field from passing proton bunches, enabling measurement of beam position and intra-bunch instabilities. Light is conveyed from a remote laser via optical fibres to a Mach-Zehnder interferometer formed between two waveguide pick-ups. The rapid response of the EO-BPM enables intra-bunch turn-by-turn measurements. Data recorded over a range of beam conditions have been studied to characterise its performance, stability, and sensitivity. This paper presents the latest data collected from the SPS and discusses the analysis and future development of the EO-BPM.

Original language	English
Title of host publication	14th International Beam Instrumentation Conference
Subtitle of host publication	07-11 Sep 2025
Place of Publication	Liverpool, UK
Publisher	JACoW Publishing
Pages	581-586
Number of pages	6
ISBN (Electronic)	978-3-95450-262-2
DOIs	https://doi.org/10.18429/JACoW-IBIC2025-WEAC01
Publication status	Published - 20 Jan 2026

Access to Document

10.18429/JACoW-IBIC2025-WEAC01Licence: CC BY

Cite this

@inproceedings{794e718231b44c66812337b85300f2e1,

title = "Analysis of a phase modulated interferometric Electro-Optic BPM at the CERN SPS",

abstract = "The Electro-Optic Beam Position Monitor (EO-BPM) is a new diagnostic tool being developed to enhance the intra-bunch transverse beam position monitoring in the High Luminosity LHC at CERN. This EO-BPM has been installed in the Super Proton Synchrotron (SPS) since 2024. The Pockels effect in lithium niobate crystals is exploited to detect the propagating electric field from passing proton bunches, enabling measurement of beam position and intra-bunch instabilities. Light is conveyed from a remote laser via optical fibres to a Mach-Zehnder interferometer formed between two waveguide pick-ups. The rapid response of the EO-BPM enables intra-bunch turn-by-turn measurements. Data recorded over a range of beam conditions have been studied to characterise its performance, stability, and sensitivity. This paper presents the latest data collected from the SPS and discusses the analysis and future development of the EO-BPM.",

author = "Max Bosman and Stephen Gibson and Alberto Arteche and Daniel Harryman and Thibaut Lefevre and Tom Levens",

year = "2026",

month = jan,

day = "20",

doi = "10.18429/JACoW-IBIC2025-WEAC01",

language = "English",

pages = "581--586",

booktitle = "14th International Beam Instrumentation Conference",

publisher = "JACoW Publishing",

}

TY - GEN

T1 - Analysis of a phase modulated interferometric Electro-Optic BPM at the CERN SPS

AU - Bosman, Max

AU - Gibson, Stephen

AU - Arteche, Alberto

AU - Harryman, Daniel

AU - Lefevre, Thibaut

AU - Levens, Tom

PY - 2026/1/20

Y1 - 2026/1/20

N2 - The Electro-Optic Beam Position Monitor (EO-BPM) is a new diagnostic tool being developed to enhance the intra-bunch transverse beam position monitoring in the High Luminosity LHC at CERN. This EO-BPM has been installed in the Super Proton Synchrotron (SPS) since 2024. The Pockels effect in lithium niobate crystals is exploited to detect the propagating electric field from passing proton bunches, enabling measurement of beam position and intra-bunch instabilities. Light is conveyed from a remote laser via optical fibres to a Mach-Zehnder interferometer formed between two waveguide pick-ups. The rapid response of the EO-BPM enables intra-bunch turn-by-turn measurements. Data recorded over a range of beam conditions have been studied to characterise its performance, stability, and sensitivity. This paper presents the latest data collected from the SPS and discusses the analysis and future development of the EO-BPM.

AB - The Electro-Optic Beam Position Monitor (EO-BPM) is a new diagnostic tool being developed to enhance the intra-bunch transverse beam position monitoring in the High Luminosity LHC at CERN. This EO-BPM has been installed in the Super Proton Synchrotron (SPS) since 2024. The Pockels effect in lithium niobate crystals is exploited to detect the propagating electric field from passing proton bunches, enabling measurement of beam position and intra-bunch instabilities. Light is conveyed from a remote laser via optical fibres to a Mach-Zehnder interferometer formed between two waveguide pick-ups. The rapid response of the EO-BPM enables intra-bunch turn-by-turn measurements. Data recorded over a range of beam conditions have been studied to characterise its performance, stability, and sensitivity. This paper presents the latest data collected from the SPS and discusses the analysis and future development of the EO-BPM.

U2 - 10.18429/JACoW-IBIC2025-WEAC01

DO - 10.18429/JACoW-IBIC2025-WEAC01

M3 - Conference contribution

SP - 581

EP - 586

BT - 14th International Beam Instrumentation Conference

PB - JACoW Publishing

CY - Liverpool, UK

ER -