2014/08/28 by S. Afach, G. Bison, K. Bodek +40 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Computational physics #Condensed matter physics #Dipole #Electric dipole moment #Electromagnetic shielding #Magnetic dipole #Magnetic field #Magnetic moment #NMR spectroscopy and applications #Neutron electric dipole moment #Nuclear Physics and Applications #Nuclear magnetic resonance #Optics #Physics #Spectrometer #nucl-ex #physics.atom-ph #physics.ins-det
paper · pdf · doi:10.1063/1.4894158
published as J. Appl. Phys. 116, 084510 (2014) · 33 pages, 18 figures
arxiv created 2014/08/28 · openalex publication_date 2014/08/28 · arxiv updated 2014/08/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.