https://doi.org/10.1140/epjc/s10052-023-12351-8
Regular Article - Experimental Physics
Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments
1
Institute for Particle Physics and Astrophysics, ETH Zürich, 8093, Zurich, Switzerland
2
Normandie Université, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, 14000, Caen, France
3
Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
4
Marian Smoluchowski Institute of Physics, Jagiellonian University, 30-348, Kraków, Poland
5
Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38026, Grenoble, France
6
Department of Physics and Astronomy, University of Kentucky, 40506, Lexington, KY, USA
7
Laboratory for High Energy Physics and Albert Einstein Center for Fundamental Physics, University of Bern, 3012, Bern, Switzerland
8
University of Zürich, 8057, Zurich, Switzerland
9
Institute of Physics, Johannes Gutenberg University, 55128, Mainz, Germany
10
Department of Physics and Astronomy, University of Sussex, Falmer, BN1 9QH, Brighton, UK
11
Institute of Physics, Photonics Center, University of Belgrade, 11080, Belgrade, Serbia
12
Instituut voor Kern-en Stralingsfysica, University of Leuven, 3001, Leuven, Belgium
13
Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587, Berlin, Germany
14
Department of Chemistry-TRIGA Site, Johannes Gutenberg University Mainz, 55128, Mainz, Germany
c
georg.bison@psi.ch
at
efrain.segarra@psi.ch
Received:
10
October
2023
Accepted:
8
December
2023
Published online:
8
January
2024
High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optimized procedure results in a residual magnetic field that has been reduced by a factor of two. The ultra-low field is achieved with the full magnetic-field-coil system, and a large vacuum vessel installed, both in the MSR. In the inner volume of 
, the field is now more uniform and below 300 pT. In addition, the procedure is faster and dissipates less heat into the magnetic environment, which in turn, reduces its thermal relaxation time from 
down to 
.
© The Author(s) 2024
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Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development.
