This activity is performed within QUAX collaboration: INFN sections of Padova (group leader),
Legnaro National Laboratory, Frascati National Laboratory, Trento, and Napoli. We take care
of the design and procurements of the high homogeneity superconducting magnets required
in the experimental detectors. We also contributed to the general problem of magnetic
interaction between the superconducting cavity and the applied field.