Title :
Experimental results of the model coil for cooling design of a 1 T cryocooler-cooled pulse coil for SMES
Author :
Tomioka, A. ; Bohno, T. ; Nose, S. ; Konno, M. ; Iwakuma, M. ; Funaki, K. ; Kajikawa, K. ; Kanetaka, H. ; Hayashi, H. ; Tsutsumi, K.
Author_Institution :
Fuji Electr. Corp. Res. & Dev. Ltd., Ichibara, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
The authors have been developing high-Tc superconducting coils for SMES applications. Their primary goal is to make a HTS coil which is cooled to 40 K by a single-stage cryocooler and continuously operated at 1 Hz with a field amplitude of 1 T. The coil has heat drains of AlN plates to remove heat because of AC losses. They made a cooling model coil system to study the effective arrangement of the heat drains. The system consisted of a model coil using Cu conductors, current leads and a cryocooled system. The test coil was divided into three sections in different arrangement of heat drains. The model coil was daubed with a high thermal conductivity epoxy resin to improve thermal contact resistance between the conductors and AlN plates. They tested the coil by Joule heating which was equal to AC losses. They measured the temperature distribution in the coil and the temperature difference between Cu conductors and AlN plates. The temperature difference was measured between 0.2 K and 0.7 K. The results will be applied to the 1 T HTS coil design.
Keywords :
cooling; high-temperature superconductors; superconducting coils; superconducting magnet energy storage; superconducting magnets; temperature distribution; thermal analysis; thermal conductivity; 0.2 to 0.7 K; 1 Hz; 1 T; 40 K; AC losses; AlN; AlN plate heat drains; SMES applications; cooling design; cryocooler-cooled pulse coil; epoxy resin; heat removal; high-Tc superconducting coils; temperature difference; temperature distribution; thermal conductivity; thermal contact resistance; Conductors; Cooling; Electrical resistance measurement; High temperature superconductors; Superconducting coils; Temperature distribution; Temperature measurement; Testing; Thermal conductivity; Thermal resistance;
Journal_Title :
Applied Superconductivity, IEEE Transactions on