Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment
C. Abel · N. J. Ayres · G. Ban · G. Bison · K. Bodek · V. Bondar · T. Bouillaud · D.C. Bowles · G.L. Caratsch · E. Chanel · W. Chen · P.-J. Chiu and 54 other authors
We present a coil system designed to generate a highly uniform magnetic field for the n2EDM experiment at the Paul Scherrer Institute. It consists of a main coil and a set of auxiliary coils mounted on a cubic structure with a side length of 273 cm, inside a large magnetically shielded room (MSR). We have assembled this system and characerized its performances with a mapping robot. The apparatus is able to generate a 1 T vertical field with a relative root mean square deviation ()/ = 3 over the volume of interest, a cylinder of radius 40 cm and height 30 cm. This level of uniformity overcomes the n2EDM requirements, allowing a measurement of the neutron Electric Dipole Moment with a sensitivity better than 1 ecm.