Abstract
A thermally switched magnetic shield which can both shield against and trap magnetic fields is described. The shield, consisting of a NbTi sheet, can trap stably fields of up to 0.3T, and shield against fields of up to 0.35 ± 0.05 T, when the in superconducting state It provides large attenuation of alternating magnetic fields in the presence of a steady trapped field. It is shown to significantly reduce the eddy current damping of the mechanical vibration of a superconducting sample in a magnetic field, by shielding nearby normal metal surfaces. A specific application to magnetic levitation of gravitational radiation antennae is discussed.
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