Journal Article

Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments

Lauss, B., nEDM collaboration at PSI, The, Bouillaud, T., Severijns, N., Zsigmond, G., Piegsa, F. M., Li, R., Pignol, G., Bowles, D., Rienäcker, I., Segarra, E. P., Ban, G., Crawford, C. B., Fertl, M., Ziehl, N., Lejuez, A., Chanel, E., Chiu, P.-J., Bodek, K., Emmenegger, S., Svirina, K., Pacura, S., Schmidt-Wellenburg, P., Griffith, W. C., Bondar, V., Krempel, J., Zejma, J., Yazdandoost, N., Rebreyend, D., Mullan, P., Thorne, J., Roccia, S., Naviliat-Cuncic, O., Schnabel, A., Pais, D., Harris, P. G., Lefort, T., Saenz-Arevalo, W., Chen, W., Kletzl, V., Ries, D., Vankeirsbilck, J., Ayres, N. J., Grujic, Z. D., Tavakoli Dinani, R., Rozpedzik, D., Fratangelo, A., Kirch, K., Doorenbos, C. B., Voigt, J., Bison, G.

2024

Overview

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 ∼ 1.4 m 3 , 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 12 h down to 1.5 h .

• Publisher: Springer Berlin Heidelberg,Springer,Springer Nature B.V,Springer Verlag (Germany),SpringerOpen
• Subject: Astronomy / Astrophysics and Cosmology / Demagnetization / Dipole moments / Electric dipoles / Electrons / Elementary Particles / Experiments / Hadrons / Heavy Ions / High Energy Physics - Experiment / Instrumentation and Detectors / Magnetic fields / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Experiment / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular - Experimental Physics / Regular Article - Experimental Physics / Relaxation time / String Theory / Thermal relaxation