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

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 Φ_T^P, the trapped field B_T^P, and the temperature rise ΔT, has been investigated as a function of the applied pulse field B_ex. The Φ_T^P and B_T^P 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.