期刊
JOURNAL OF APPLIED PHYSICS
卷 116, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4894158
关键词
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资金
- Swiss National Science Foundation [200021_126562, 200020_144473, 200021_138211, 200020_149211, CRSII2_144257, 200020_140421]
- Fund for Scientific Research Flanders (FWO)
- K. U. Leuven [GOA/2010/10]
- Foundation for Polish Science-MPD program
- European Union within the European Regional Development Fund
- National Science Centre, Poland [2012/04/M/ST2/00556]
- [ANR-09-BLAN-0046]
- Swiss National Science Foundation (SNF) [200021_126562, 200020_149211, 200020_144473, 200020_140421, CRSII2_144257, 200021_138211] Funding Source: Swiss National Science Foundation (SNF)
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 2.5m x 2.5m x 3m, disturbances of the magnetic field are attenuated by factors of 5-50 at a bandwidth from 10(-3) Hz up to 0.5Hz, 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. (C) 2014 AIP Publishing LLC.
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