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

Journal Article · Thu Aug 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4894158· OSTI ID:22314363

Afach, S.; Fertl, M.; Kirch, K. ^[1]; Bison, G.; Burri, F.; Chowdhuri, Z.; Daum, M.; Henneck, R.; Meier, M.; Schmidt-Wellenburg, P.; Zsigmond, G. ^[1]; Bodek, K.; Zejma, J. ^[2]; Grujic, Z.; Kasprzak, M.; Weis, A. ^[3]; Hélaine, V. ^[4]; Koch, H. -C. ^[5]; others, and

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1. Paul Scherrer Institute, Villigen (Switzerland)
2. Jagellonian University, Cracow (Poland)
3. University of Fribourg (Switzerland)
4. Laboratoire de Physique Corpusculaire, Caen (France)
5. Institut für Physik, Johannes-Gutenberg-Universität, Mainz (Germany)

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{sup −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.

• OSTI ID: 22314363
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL
CURRENTS
DISTURBANCES
ELECTRIC DIPOLE MOMENTS
FEEDBACK
LAYERS
MAGNETIC FIELDS
METALS
NEUTRONS
NOISE
RANDOMNESS
SENSORS
SHIELDING
SHIELDS
SPECTROMETERS
STABILIZATION