Title :
Thermal Runaway Characteristics of Bi2212 Coil for Conduction-Cooled SMES
Author :
Kojima, Hiroki ; Hayakawa, Naoki ; Noguchi, Shinki ; Endo, Fumihiro ; Hirano, Naoki ; Nagaya, Shigeo ; Okubo, Hitoshi
Author_Institution :
Nagoya Univ., Nagoya
fDate :
6/1/2007 12:00:00 AM
Abstract :
In this paper, we investigated the thermal runaway characteristics of a conduction-cooled Bi2212 HTS coil with a 4 K-GM cryocooler system under compensating operation for load fluctuations. We measured the temporal evolutions of temperature and voltage distributions of the HTS solenoidal coil for typical current patterns of load fluctuation compensation at different ambient temperatures. On the basis of these experimental results, we constructed a thermal analysis model, and analysed the thermal runaway characteristics during and after the load fluctuation compensation. Based on the results of our experiments and the numerical simulations, we proposed criterion for the monitoring of an HTS SMES system during compensating operation for load fluctuations.
Keywords :
bismuth compounds; calcium compounds; cryogenics; high-temperature superconductors; strontium compounds; superconducting coils; superconducting magnet energy storage; thermal analysis; Bi2Sr2CaCu2O9; GM cryocooler system; HTS SMES system; HTS solenoidal coil; conduction-cooled SMES; load fluctuation compensation; temperature 4 K; thermal analysis; thermal runaway characteristics; Coils; Current measurement; Fluctuations; High temperature superconductors; Numerical simulation; Samarium; Temperature distribution; Thermal conductivity; Thermal loading; Voltage; Bi2212; SMES; conduction-cooling; thermal runaway;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898492
