Electron Beam Characterization via Quantum Coherent Optical Magnetometry
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 perturb 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 {\mu}A. Our approach is insensitive to electron kinetic energy, and we confirmed that experimentally between 10 to 20 keV. This technique offers a unique platform for non-invasive characterization of charged particle beams used in accelerators for particle and nuclear physics research.
Cite
@article{arxiv.2412.02686,
title = {Electron Beam Characterization via Quantum Coherent Optical Magnetometry},
author = {Nicolas DeStefano and Saeed Pegahan and Aneesh Ramaswamy and Seth Aubin and T. Averett and Alexandre Camsonne and Svetlana Malinovskaya and Eugeniy E. Mikhailov and Gunn Park and Shukui Zhang and Irina Novikova},
journal= {arXiv preprint arXiv:2412.02686},
year = {2024}
}