Electron beam characterization via quantum coherent optical magnetometry

We present a quantum optics-based detection method for determining the position and current of an electron beam. As electrons pass through a dilute vapor of rubidium atoms, their magnetic field perturbs the atomic spin's quantum state and causes polarization rotation of a laser resonant with an optical transition of the atoms. By measuring the polarization rotation angle across the laser beam, we recreate a 2D projection of the magnetic field and use it to determine the e-beam position, size, and total current. We tested this method for an e-beam with currents ranging from 30 to 110 μA. Our approach is insensitive to electron kinetic energy, and we confirmed that experimentally between 10 and 20 keV. This technique offers a unique platform for noninvasive characterization of charged particle beams used in accelerators for particle and nuclear physics research.

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Publication Details

Journal
Applied Physics Letters
Published
2024-12-23
DOI
https://doi.org/10.1063/5.0234219
Citations
3
Primary Topic
Atomic and Subatomic Physics Research
Type
article
Field-Weighted Citation Impact
1.01

Funders

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Electron beam characterization via quantum coherent optical magnetometry

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Electron beam characterization via quantum coherent optical magnetometry

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article en
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Abstract

We present a quantum optics-based detection method for determining the position and current of an electron beam. As electrons pass through a dilute vapor of rubidium atoms, their magnetic field perturbs the atomic spin's quantum state and causes polarization rotation of a laser resonant with an optical transition of the atoms. By measuring the polarization rotation angle across the laser beam, we recreate a 2D projection of the magnetic field and use it to determine the e-beam position, size, and total current. We tested this method for an e-beam with currents ranging from 30 to 110 μA. Our approach is insensitive to electron kinetic energy, and we confirmed that experimentally between 10 and 20 keV. This technique offers a unique platform for noninvasive characterization of charged particle beams used in accelerators for particle and nuclear physics research.

Applied Physics LettersVol. 125(26)
Stevens Institute of Technology (US), William & Mary (US), Williams (United States) (US), Thomas Jefferson National Accelerator Facility (US)
National Science Foundation, U.S. Department of Energy, Laboratory Directed Research and Development
Affordable and clean energy
Openalex Percentile: Top 23%
Atomic and Subatomic Physics Research
1.01
DOIOpen Access PDFOpenAlex
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