Loss in QMG Processed Y-123 Superconductor due
to Ac Current
Title, author, abstract
- title
-
Loss in QMG Processed Y-123 Superconductor due
to Ac Current
- authors
-
Hiroshi Matsuoka(1), Masayuki Izawa(1), Teruo Matsushita(1,2)
Kazuhiro Kajikawa(3), Masataka Iwakuma(3), Kazuo Funaki(3)
(1)Department of Computer Science and Electronics, Kyushu
Institute of Technology,
680--4 Kawazu, Iizuka, 820 JAPAN
(2)Graduate School of
Information Science and Electrical Engineering (ISEE),
Kyushu University,
6--10--1 Hakozaki, Higashi-ku, Fukuoka 812--81, Japan
(3)Research Institute of
Superconductivity, Kyushu University,
6--10--1 Hakozaki,
Higashi-ku, Fukuoka 812--81, Japan
- abstract
-
Ac transport current loss is measured for a
QMG (Quench and Melt Growth) processed Y-123 bulk
superconductor up to 300~A at 77.3~K. For this purpose a
simple current transformer is used. The frequency of ac
current is 400 and 550~Hz. The hysteresis loss extrapolated
to zero~Hz is compared with the prediction of the
Irie-Yamafuji model where the critical current density is
estimated from the hysteresis of dc magnetization. The
obtained hysteresis loss is slightly smaller than the
theoretical prediction. This is considered to be caused by
the reduction in the critical current density due to the
flux creep in the dc magnetization measurement.
- Original paper appears in
-
10th International Symposium on Superconductivity
October 28--30, 1997
Gifu, Japan