Effect of metal ring setting outside HTSC bulk disk on trapped field and temperature rise in pulse field magnetizing

摘要

In order to enhance the trapped field in cryo-cooled HTSC bulks using pulse field magnetizing (PFM), a metal ring (stainless steel 304 and/or Al) has been tightly set onto the SmBaCuO bulk disk and the relation between the total trapped flux ΦTP, the trapped field BTP, and the temperature rise ΔT, has been investigated as a function of the applied pulse field Bex. The ΦTP and BTP values are enhanced about 10 ∼ 20% by the metal ring due to the reduction in the temperature rise ΔT. These results suggest that a part of the generated heat Q due to the flux motion in the peripheral region promptly transfers to the metal ring and the heat transfer to the cold stage is improved by the ring setting.