Simultaneous Magnetic Shielding and Magnetization Loss Measurements of YBCO Cylinders at Variable Temperatures Under Cryogenic Helium Gas Circulation

A novel experimental setup for simultaneous measurements of magnetic shielding characteristics and magnetization ac loss measurements is described. The measurement system consists of a controllable helium circulation system that enables cooling of the samples to temperatures as low as 15 K and simultaneously allows calorimetric ac loss measurements. The simultaneous measurement of shielding characteristics and ac losses permits estimation of losses in realistic operating conditions of high-temperature superconducting magnetic shields. It is shown that if the extent of losses is high compared with the cooling efficiency, the magnetic shields could quench. The data on magnetic shielding efficacy along with the corresponding magnetization losses are presented.

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