TY - JOUR
T1 - Quench and normal zone propagation characteristics of rhqt-processed nb3al wires under cryocooler-cooling conditions
AU - Murase, Satoru
AU - Shimoyama, M.
AU - Nanato, Nozomu
AU - Kim, S. B.
AU - Nishijima, G.
AU - Watanabe, K.
AU - Kikuchi, A.
AU - Banno, N.
AU - Takeuchi, T.
N1 - Funding Information:
Manuscript received August 16, 2008. First published June 30, 2009; current version published July 15, 2009. This work was supported in part by the Budget of the National Institute for Materials Science and the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology, based on the screening and counseling by the Atomic Energy Commission. Part of this work was performed at High Field Laboratory for Superconducting Materials, Institute for Material Research, Tohoku University.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/6
Y1 - 2009/6
N2 - The minimum quench energy (MQE) and normal zone propagation velocity (NZPV) of three kinds of Nb3Al superconductors fabricated by the rapid heating, quenching and transformation (RHQT) process were measured under various conditions of applied magnetic field (10-14 T), temperature (7-11 K), and transport current (80-95% of the critical current), while cooled by a cryocooler for developing the over 20-T class cryogen-free magnet. As a result, MQE values were related to the critical current density (Jc); high MQE was obtained for low Jc. It is assumed that Jc has a stronger influence on the MQE than specific heat, thermal conductivity, resistivity, and other parameters of the composite superconductor including the matrix and the stabilizer. NZPV was mainly proportional to the transport current density varying with applied field and temperature. The second contribution to NZPV is assumed to be heat capacity depending on the wire configuration
AB - The minimum quench energy (MQE) and normal zone propagation velocity (NZPV) of three kinds of Nb3Al superconductors fabricated by the rapid heating, quenching and transformation (RHQT) process were measured under various conditions of applied magnetic field (10-14 T), temperature (7-11 K), and transport current (80-95% of the critical current), while cooled by a cryocooler for developing the over 20-T class cryogen-free magnet. As a result, MQE values were related to the critical current density (Jc); high MQE was obtained for low Jc. It is assumed that Jc has a stronger influence on the MQE than specific heat, thermal conductivity, resistivity, and other parameters of the composite superconductor including the matrix and the stabilizer. NZPV was mainly proportional to the transport current density varying with applied field and temperature. The second contribution to NZPV is assumed to be heat capacity depending on the wire configuration
KW - Cryocooler cooling
KW - NbAl
KW - Superconducting wire
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=68649107533&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=68649107533&partnerID=8YFLogxK
U2 - 10.1109/TASC.2009.2018149
DO - 10.1109/TASC.2009.2018149
M3 - Article
AN - SCOPUS:68649107533
SN - 1051-8223
VL - 19
SP - 2666
EP - 2669
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
M1 - 5153155
ER -