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Title: 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 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.
Authors:
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  1. Paul Scherrer Institute, Villigen (Switzerland)
  2. (Switzerland)
  3. Jagellonian University, Cracow (Poland)
  4. University of Fribourg (Switzerland)
  5. Laboratoire de Physique Corpusculaire, Caen (France)
  6. Institut für Physik, Johannes-Gutenberg-Universität, Mainz (Germany)
Publication Date:
OSTI Identifier:
22314363
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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