TY - JOUR
T1 - Numerical simulation of thermal properties of a cryocooler-cooled Bi2223 superconducting pulsed coil in AC operation
AU - Miyazaki, H.
AU - Chigusa, S.
AU - Tanaka, I.
AU - Iwakuma, M.
AU - Funaki, K.
AU - Hayashi, H.
AU - Tomioka, A.
N1 - Funding Information:
Manuscript received September 20, 2005. This work was supported in part by the Ministry of Education, Science, Sports, and Culture under Grant-in-Aid for Scientific Research (B) 16360139, 2004-2006.
PY - 2006/6
Y1 - 2006/6
N2 - We fabricated a cryocooler-cooled Bi2223 superconducting pulsed coil and experimentally studied the thermal run-away in dc or ac operation. We carried out numerical simulation of thermal properties of the coil in order to explain the thermal runaway of the coil. Firstly, we analyzed the total heat generation of flux-flow losses and ac losses inside the winding from the experimental results of the external field losses and the E - J characteristics for the Bi2223 strands. Secondly, we numerically simulated the thermal properties by using a 2-dimensional heat conduction equation with axial symmetry. The numerical simulation shows the relation between the initiation of thermal runaway and the temperature distribution with highly concentrated heat source in the winding. We have a semi-quantitative agreement between the numerical results and the experimental ones for the condition of the thermal runaway.
AB - We fabricated a cryocooler-cooled Bi2223 superconducting pulsed coil and experimentally studied the thermal run-away in dc or ac operation. We carried out numerical simulation of thermal properties of the coil in order to explain the thermal runaway of the coil. Firstly, we analyzed the total heat generation of flux-flow losses and ac losses inside the winding from the experimental results of the external field losses and the E - J characteristics for the Bi2223 strands. Secondly, we numerically simulated the thermal properties by using a 2-dimensional heat conduction equation with axial symmetry. The numerical simulation shows the relation between the initiation of thermal runaway and the temperature distribution with highly concentrated heat source in the winding. We have a semi-quantitative agreement between the numerical results and the experimental ones for the condition of the thermal runaway.
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U2 - 10.1109/TASC.2006.873266
DO - 10.1109/TASC.2006.873266
M3 - Article
AN - SCOPUS:33746627702
SN - 1051-8223
VL - 16
SP - 1749
EP - 1752
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
M1 - 1643200
ER -