Detection of a DC Electric Field Using Electro-Optical Crystals

A. Cristiano, M. Krupa, R. Hill

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Standard Beam Position Monitors (BPM) are intrinsically insensitive to beams with no temporal structure, so-called DC beams, which many CERN experiments rely on. We therefore propose a novel detection technique in which the usual BPM electrodes are replaced with electro-optic (EO) crystals. When exposed to an electric field, such crystals change their optical properties. This can be exploited to encode the electric field magnitude onto the polarisation state of a laser beam crossing the crystal. An additional EO crystal, placed outside the vacuum chamber, can be used to control the system's working point and to introduce a sinusoidal modulation, allowing DC measurements to be performed in the frequency domain. This contribution presents the working principle of this measurement technique, its known limitations, and possible solutions to further increase the system's performance. Analytical results and simulations for a double-crystal optical chain are benchmarked against the experimental data taken on a laboratory test bench.

Original languageEnglish
Title of host publicationProceedings of 11th International Beam Instrumentation Conference
Subtitle of host publicationIBIC2022
EditorsPeter Forck, Adriana Wawrzyniak, Volker R.W. Schaa, Grzegorz W. Kowalski, Agnieszka Cudek
PublisherJACoW Publishing
Number of pages5
ISBN (Electronic)9783954502417
Publication statusPublished - 3 Dec 2022
Event11th International Beam Instrumentation Conference - Krakow, Poland
Duration: 11 Sep 202215 Sep 2022
Conference number: 11

Publication series

NameProceedings of the International Beam Instrumentation Conference, IBIC
PublisherJACoW Publishing
ISSN (Electronic)2673-5350


Conference11th International Beam Instrumentation Conference
Abbreviated titleIBIC 2022

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