Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments

Ayres, N. J.; Ban, G.; Bison, G.; Bodek, K.; Бондар, В. М.; Chiu, P.-J.; Clément, B.; Crawford, Christopher; Daum, M.; Emmenegger, S.; Fertl, M.; Fratangelo, Anastasio; Griffith, William C.; Grujić, Zoran; Harris, Philip; Kirch, K.; Koss, P.; Lauss, B.; Lefort, T.; Mohanmurthy, Prajwal; Naviliat‐Cuncic, O.; Pais, D.; Piegsa, F. M.; Pignol, G.; Rebreyend, D.; Rienäcker, I.; Ries, D.; Roccia, S.; Ross, K. U.; Rozpędzik, D.; Schmidt-Wellenburg, P.; Schnabel, A.; Severijns, N.; Shen, B. S. P.; Dinani, R. Tavakoli; Thorne, Jacob; Virot, R.; Yazdandoost, N.; Zejma, J.; Zsigmond, G.

doi:10.1103/physreva.103.062801

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…Because of the difference between adiabatic and nonadiabatic magnetic-field samplings for UCNs and 199 Hg atoms, the volume-averaged fields sampled by both species are slightly different. A finite-element analysis was used to simulate temporal and spatial noise [74] from which we calculated the time-and-volume-averaged magnetic-field difference sensed by both particle ensembles. As JNN leads to random magnetic-field fluctuations independent of ⃗ B 0 polarity, we assume that this effect δ JNN only increases the measurement uncertainty but does not shift the central R value.…”

Section: Crossing-point Analysismentioning

confidence: 99%

Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI

Ayres,

Bison,

Bodek

et al. 2023

New J. Phys.

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We report on a search for a new, short-range, spin-dependent interaction using a modified version of the experimental apparatus used to measure the permanent neutron electric dipole moment at the Paul Scherrer Institute. This interaction, which could be mediated by axion-like particles, concerned the unpolarized nucleons (protons and neutrons) near the material surfaces of the apparatus and polarized ultracold neutrons stored in vacuum. The dominant systematic uncertainty resulting from magnetic-field gradients was controlled to an unprecedented level of approximately 4 pT cm−1 using an array of optically-pumped cesium vapor magnetometers and magnetic-field maps independently recorded using a dedicated measurement device. No signature of a theoretically predicted new interaction was found, and we set a new limit on the product of the scalar and the pseudoscalar couplings g s g p λ 2 < 8.3 × 10 − 28 m2 (95% C.L.) in a range of 5 µm < λ < 25 mm for the monopole–dipole interaction. This new result confirms and improves our previous limit by a factor of 2.7 and provides the current tightest limit obtained with free neutrons.

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Section: Crossing-point Analysismentioning

confidence: 99%

Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI

Ayres,

Bison,

Bodek

et al. 2023

New J. Phys.

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A practical approach to calculating magnetic Johnson noise for precision measurements

Phan,

Clayton,

Kim

et al. 2024

Journal of Applied Physics

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Magnetic Johnson noise is an important consideration for many applications involving precision magnetometry, and its significance will only increase in the future with improvements in measurement sensitivity. The fluctuation–dissipation theorem can be utilized to derive analytic expressions for magnetic Johnson noise in certain situations, but when used in conjunction with finite element analysis tools, the combined approach is particularly powerful as it provides a practical means to calculate the magnetic Johnson noise arising from conductors of arbitrary geometry and permeability. In this paper, we demonstrate this method to be one of the most comprehensive approaches presently available to calculate thermal magnetic noise. In particular, its applicability is shown to not be limited to cases where the noise is evaluated at a point in space but also can be expanded to include cases where the magnetic field detector has a more general shape, such as a finite-size loop, a gradiometer, or a detector that consists of a polarized atomic species trapped in a volume. Furthermore, some physics insights gained through studies made using this method are discussed.

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Fast Dynamic Frequency Response-Based Multiparameter Measurement in Spin-Exchange Relaxation-Free Comagnetometers

Wei

Zhao

et al. 2021

IEEE Trans. Instrum. Meas.

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Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments

Cited by 3 publications

References 41 publications

Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI

Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI

A practical approach to calculating magnetic Johnson noise for precision measurements

Fast Dynamic Frequency Response-Based Multiparameter Measurement in Spin-Exchange Relaxation-Free Comagnetometers

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