Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by a fa...

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Bibliographic Details
Published in:Journal of applied physics 2014-08, Vol.116 (8)
Main Authors: Afach, S., Bison, G., Bodek, K., Burri, F., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Grujic, Z., Hélaine, V., Henneck, R., Kasprzak, M., Kirch, K., Koch, H.-C., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Meier, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rebreyend, D., Roccia, S., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Voigt, J., Weis, A., Wyszynski, G., Zejma, J., Zenner, J., Zsigmond, G.
Format: Article
Language:English
Subjects:
Applied physics
Atomic Physics
Background noise
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coils
CONTROL
CURRENTS
Dipole moments
DISTURBANCES
ELECTRIC DIPOLE MOMENTS
Electric dipoles
FEEDBACK
Instrumentation and Detectors
LAYERS
MAGNETIC FIELDS
Magnetic shielding
Magnetism
METALS
NEUTRONS
NOISE
Nuclear Experiment
Physics
RANDOMNESS
SENSORS
SHIELDING
SHIELDS
SPECTROMETERS
STABILIZATION
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Description
Summary:The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by a factor of about 20. Within a control volume of approximately 2.5 m × 2.5 m × 3 m, disturbances of the magnetic field are attenuated by factors of 5–50 at a bandwidth from 10−3 Hz up to 0.5 Hz, which corresponds to integration times longer than several hundreds of seconds and represent the important timescale for the neutron electric dipole moment measurement. These shielding factors apply to random environmental noise from arbitrary sources. This is achieved via a proportional-integral feedback stabilization system that includes a regularized pseudoinverse matrix of proportionality factors which correlates magnetic field changes at all sensor positions to current changes in the SFC coils.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4894158