Solidification of nitrogen refrigerant and its effect on thermal stability of HTSC tape

摘要

We investigated the effect of solidified nitrogen refrigerant upon the thermal stability of HTSC tape. Solid nitrogen was produced by two methods, one by conduction cooling at a very slow cooling rate and another by evacuating the vapor. It was shown experimentally that the thermal stability of HTSC tape is improved drastically when it is impregnated with solid nitrogen produced by the conduction cooling. Furthermore, so-called dry-out phenomenon was dominated by the cumulative energy of the thermal disturbance by the heater.