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High-precision searches for an electric dipole moment of the neutron (nEDM)require stable and uniform magnetic field environments. We present the recentachievements of degaussing and equilibrating the magnetically shielded room(MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present thefinal degaussing configuration that will be used for n2EDM after numerousstudies. The optimized procedure results in a residual magnetic field that hasbeen reduced by a factor of two. The ultra-low field is achieved with the fullmagnetic-field-coil system, and a large vacuum vessel installed, both in theMSR. In the inner volume of ~1.4 m^3, the field is now more uniform and below300 pT. In addition, the procedure is faster and dissipates less heat into themagnetic environment, which in turn, reduces its thermal relaxation time from12 h down to ~1.5 h.

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