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First difference mode interferometer demonstration for a high-bandwidth Electro-Optic Beam Position Monitor
A Arteche1, S M Gibson2, A Schloegelhofer3
1Physics Department, John Adams Institute for Accelerator Science at Royal Holloway, University of London, Egham Hill, Egham, TW20 0EX, UK. alberto.arteche@rhul.ac.uk.
Scientific Reports
|December 5, 2025
Summary
This study demonstrates a new Electro-Optic Beam Position Monitor (EO-BPM) using differential-field detection. This innovative device achieves sub-millimetric resolution and ultrafast response for high-energy particle beams.
Area of Science:
- Particle accelerator technology
- High-energy physics instrumentation
- Optical sensing
Background:
- Development of advanced beam diagnostics is crucial for High-Luminosity Large Hadron Collider (HL-LHC) upgrades.
- Existing beam position monitors face challenges with high bandwidth and radiation environments.
- Novel detection schemes are needed for precise monitoring of ultra-relativistic particle bunches.
Purpose of the Study:
- To experimentally demonstrate the differential-field detection mode (Δ) for a novel interferometric Electro-Optic Beam Position Monitor (EO-BPM).
- To validate a new field-focusing pickup design for high-bandwidth, single-pass detection of HL-LHC proton bunches.
- To assess the transverse position and time-resolution capabilities of the EO-BPM system.
Main Methods:
- Utilized a fibre-coupled Mach-Zehnder interferometry scheme for detection.
- Engineered a novel field-focusing pickup design for enhanced signal acquisition.
- Tested the system at the HiRadMat and CLEAR beamlines for transverse position and time-resolution measurements, respectively.
- Evaluated signal stability under high levels of back-scattering radiation.
Main Results:
- Achieved sub-millimetric transverse position resolution.
- Demonstrated an ultrafast time response below the HL-LHC goal.
- Confirmed high-bandwidth detection capabilities for SPS-like proton bunch parameters.
- Showcased the system's robustness and suitability for high-radiation environments due to its optical nature.
Conclusions:
- The differential-field detection mode is a viable and effective component for advanced EO-BPM development.
- The novel EO-BPM design offers high precision and speed necessary for future collider experiments.
- The optical nature of the EO-BPM ensures reliable performance in challenging radiation conditions.
