The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements

N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, B. Clement, E. Chanel, P. J. Chiu, C. B. Crawford, M. Daum, C. B. Doorenbos, S. Emmenegger, A. Fratangelo, M. Fertl, W. C. Griffith, Z. D. Grujic, P. G. Harris, K. Kirch, J. KrempelB. Lauss, T. Lefort, O. Naviliat-Cuncic, D. Pais, F. M. Piegsa, G. Pignol, G. Rauscher, D. Rebreyend, I. Rienäcker, D. Ries, S. Roccia, D. Rozpedzik, W. Saenz-Arevalo, P. Schmidt-Wellenburg, A. Schnabel, N. Severijns, B. Shen, M. Staab, K. Svirina, R. Tavakoli Dinani, J. Thorne, N. Yazdandoost, J. Zejma, G. Zsigmond

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute, which features an interior cubic volume with each side of length 2.92 m, thus providing an accessible space of 25 m3. The MSR has 87 openings of diameter up to 220 mm for operating the experimental apparatus inside and an intermediate space between the layers for housing sensitive signal processing electronics. The characterization measurements show a remanent magnetic field in the central 1 m3 below 100 pT and a field below 600 pT in the entire inner volume, up to 4 cm to the walls. The quasi-static shielding factor at 0.01 Hz measured with a sinusoidal 2 μT peak-to-peak signal is about 100 000 in all three spatial directions and increases rapidly with frequency to reach 108 above 1 Hz.

Original languageEnglish
Article number095105
JournalReview of Scientific Instruments
Issue number9
StatePublished - Sep 1 2022

Bibliographical note

Funding Information:
We acknowledge the dedicated work of Lela Bauer, Markus Hein, and Michael Wüst, comprising the group for magnetically shielded rooms in the company VAC-Vacuumschmelze, Hanau; the support of Michael Meier in the planning and construction stages; support of Thomas Stapf in the design and installation stages; and the technical support provided by Luke Noorda. We appreciate the help provided by the PSI support groups in the installation stage. Financial support by the Swiss National Science Foundation R‘EQUIP under Grant No. 139140, by PSI, and by the Emil-Berthele-Fonds is acknowledged. The material scans inside BMSR-2 were supported by the Core Facility “Metrology of Ultra-Low Magnetic Fields” at Physikalisch-Technische Bundesanstalt, which received funding from the Deutsche Forschungsgemeinschaft–DFG (funding codes: Grant Nos. DFG KO 5321/3-1 and TR 408/11-1). Support by the Swiss National Science Foundation Project Nos. 200020-188700 (PSI), 200020-163413 (PSI), 200011-178951 (PSI), 172626 (PSI), 169596 (PSI), 200021-181996 (Bern), 200441 (ETH), FLARE 20FL21-186179, and 20FL20-201473 is gratefully acknowledged. The LPC Caen and the LPSC Grenoble acknowledge the support of the French Agence Nationale de la Recherche (ANR) under Reference No. ANR-14-CE33-0007 and the ERC Project No. 716651-NEDM. University of Bern acknowledges the support received via the European Research Council under the ERC Grant Agreement No. 715031-Beam-EDM. The Polish collaborators wish to acknowledge support from the National Science Center, Poland, under Grant Nos. 2018/30/M/ST2/00319 and 2020/37/B/ST2/02349. Support by the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (Grant No. PRISMA+EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project No. 39083149) is acknowledged. Collaborators at the University of Sussex wish to acknowledge support from the School of Mathematical and Physical Sciences, as well as from the STFC under Grant No. ST/S000798/1. This work was partly supported by the Fund for Scientific Research Flanders (FWO), and Project No. GOA/2010/10 of the KU Leuven. Researchers from the University of Belgrade acknowledge institutional funding provided by the Institute of Physics Belgrade through a grant by the Ministry of Education, Science and Technological Development of the Republic of Serbia.

Publisher Copyright:
© 2022 Author(s).

ASJC Scopus subject areas

  • Instrumentation


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