TY - JOUR
T1 - Effective resistance of the HTS floating coil of the Mini-RT project
AU - Yanagi, Nagato
AU - Mito, Toshiyuki
AU - Hemmi, Tsutomu
AU - Seo, Kazutaka
AU - Morikawa, Junji
AU - Ogawa, Yuichi
AU - Iwakuma, Masataka
N1 - Funding Information:
Manuscript received October 5, 2004. This work was supported by the auspices of the NIFS Collaborative Research Program and by Grant-in-Aids for Scientific Research (no. 12308019 and no. 14580532) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. N. Yanagi, T. Mito, and K. Seo are with the National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan (e-mail: yanagi@nifs.ac.jp). T. Hemmi is with the Graduate University for Advanced Studies, 322-6, Gifu 509-5292, Japan. J. Morikawa and Y. Ogawa are with the University of Tokyo, Tokyo 113-8656, Japan. M. Iwakuma is with Kyushu University, Fukuoka 812-8581, Japan. Digital Object Identifier 10.1109/TASC.2005.849104 Fig. 1. Spatial profiles of the magnetic field lines within and outside the HTS floating coil of the Mini-RT device. The thick lines indicate the periphery of the HTS windings.
PY - 2005/6
Y1 - 2005/6
N2 - A magnetically levitated superconducting coil device, Mini-RT, has been constructed using high temperature superconductors for the purpose of examining a new magnetic confinement scheme of high-beta plasmas. The floating coil is wound with Bi-2223/Ag tapes, and it is operated in the temperature range of 20-40 K. The excitation tests of the coil were carried out and persistent current was sustained for magnetic levitation. The decay time constant of the persistent current was measured and the effective resistance of the coil cables was evaluated. The obtained resistance shows a considerable increase than that predicted by the n-value model. This might be caused by some electromagnetic effects such as the loss generation with long-lived shielding currents. This consideration was examined by measuring the magnetization of an HTS sample coil.
AB - A magnetically levitated superconducting coil device, Mini-RT, has been constructed using high temperature superconductors for the purpose of examining a new magnetic confinement scheme of high-beta plasmas. The floating coil is wound with Bi-2223/Ag tapes, and it is operated in the temperature range of 20-40 K. The excitation tests of the coil were carried out and persistent current was sustained for magnetic levitation. The decay time constant of the persistent current was measured and the effective resistance of the coil cables was evaluated. The obtained resistance shows a considerable increase than that predicted by the n-value model. This might be caused by some electromagnetic effects such as the loss generation with long-lived shielding currents. This consideration was examined by measuring the magnetization of an HTS sample coil.
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U2 - 10.1109/TASC.2005.849104
DO - 10.1109/TASC.2005.849104
M3 - Article
AN - SCOPUS:22044454275
SN - 1051-8223
VL - 15
SP - 1399
EP - 1402
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 PART II
ER -