Johnson-Nyquist Noise Effects in Neutron Electric-Dipole-Moment Experiments - P. Harris.pdf (1.28 MB)
Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments
journal contribution
posted on 2023-06-10, 00:36 authored by N J Ayres, G Ban, G Bison, K Bodek, V Bondar, P-J Chiu, B Clement, C B Crawford, M Daum, S Emmenegger, M Fertl, A Fratangelo, Clark GriffithClark Griffith, Z D Grujic, Philip Harris, othersMagnetic Johnson-Nyquist noise (JNN) originating from metal electrodes, used to create a static electric field in neutron electric-dipole-moment (nEDM) experiments, may limit the sensitivity of measurements. We present here a dedicated study on JNN applied to a large-scale long-measurement-time experiment with the implementation of a comagnetometry. In this study, we derive surface- and volume-averaged root-mean-square normal noise amplitudes at a certain frequency bandwidth for a cylindrical geometry. In addition, we model the source of noise as a finite number of current dipoles and demonstrate a method to simulate temporal and three-dimensional spatial dependencies of JNN. The calculations are applied to estimate the impact of JNN on measurements with the new apparatus, n2EDM, at the Paul Scherrer Institute. We demonstrate that the performances of the optically pumped Cs133 magnetometers and Hg199 comagnetometers, which will be used in the apparatus, are not limited by JNN. Further, we find that, in measurements deploying a comagnetometer system, the impact of JNN is negligible for nEDM searches down to a sensitivity of 4×10-28ecm in a single measurement; therefore, the use of economically and mechanically favored solid aluminum electrodes is possible.
Funding
Sussex Experimental Particle Physics Capital Equipment 2016; G2084; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P00587X/1
STFC Experimental Particle Physics 2018 Consolidated Grant; G2740; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/S000798/1
Sussex Experimental Particle Physics 2015 Consolidated Grant; G1763; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/N000307/1
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Publication status
- Published
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- Accepted version
Journal
Physical Review AISSN
2469-9926Publisher
American Physical SocietyExternal DOI
Issue
6Volume
103Article number
a062801Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-08-10First Open Access (FOA) Date
2021-08-10First Compliant Deposit (FCD) Date
2021-08-10Usage metrics
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