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Hamada, Kazuya; Takahashi, Yoshikazu; Matsui, Kunihiro; Kato, Takashi; Okuno, Kiyoshi
Cryogenics, 44(1), p.45 - 52, 2004/01
Times Cited Count：21 Percentile：61.01(Thermodynamics)In the ITER Central Solenoid Model Coil (CSMC) and a CS Insert Coil (CSIC) experiment, a pressure drop of the CSIC decreased by about 12% at 40 kA, 10 T and coupling losses indicated an transport current dependence. As a result of pressure drop analysis, an electromagnetic force causes a compressive deformation of cable in a jacket and a new flow passage was generated as a gap between cable and jacket. The cable deformation causes a decrease of a contact electrical resistance between strands and an increase of coupling losses. Taking account of the electromagnetic force dependency of a coupling time constant, calculated coupling losses show a good agreement with measured coupling losses at a pulsed operation of CSMC and CSIC.
Matsui, Kunihiro; Takahashi, Yoshikazu; Koizumi, Norikiyo; Isono, Takaaki; Hamada, Kazuya; Nunoya, Yoshihiko; CS Model Coil Test Group
Teion Kogaku, 38(8), p.410 - 416, 2003/08
The test of the ITER Central Solenoid (CS) model coil, CS and Nb
Al inserts was carried. The AC loss measurement is one of the most important tests to determine coil performance. The coupling losses of CS and NbAl inserts were measured by calorimetric and magnetization methods, respectively. Both coils had coupling losses with many coupling time constant, and induced circulation currents were observed by voltage taps and hall sensors. Coupling losses decreased with exponential decay constants since the electromagnetic force broke weak sinter among the strands. The gap, created between the cable and the conduit by electromagnetic force, is dependent on the pressure drop of the coolant that flows in the conductor. Our analysis shows that the exponential decay constant of coupling losses is dependent on the gap size. If we can evaluate this exponential decay constant and apply the electromagnetic force that corresponds for the exponential decay constant to the conductor before the regular operation, we can use coils of the condition that coupling losses decrease on the operation.
Shimamoto, Susumu*; Murase, Satoru*; Nishii, Kenji*; Naito, Fuminobu*; Matsui, Kunihiro; Takahashi, Yoshikazu; Tsuji, Hiroshi
Denki Gakkai Rombunshi, B, 122(1), p.58 - 63, 2002/01
no abstracts in English
Matsui, Kunihiro; Nunoya, Yoshihiko; Kawano, Katsumi; Takahashi, Yoshikazu; Nishii, Kenji*; CS Model Coil Test Group
Teion Kogaku, 36(6), p.361 - 367, 2001/06
no abstracts in English
Sn conductor for ITERTakahashi, Yoshikazu; Matsui, Kunihiro; Nishii, Kenji; Koizumi, Norikiyo; Nunoya, Yoshihiko; Isono, Takaaki; Ando, Toshinari; Tsuji, Hiroshi; Murase, Satoru*; Shimamoto, Susumu*
IEEE Transactions on Applied Superconductivity, 11(1), p.1546 - 1549, 2001/03
Times Cited Count：30 Percentile：77.4(Engineering, Electrical & Electronic)no abstracts in English
R.J.Nelson*; Takahashi, Yoshikazu; Isono, Takaaki; *; Otsu, K.*; Tajiri, F.*
JAERI-M 93-219, 48 Pages, 1993/11
no abstracts in English
Ando, Toshinari; T.A.Painter*
Teion Kogaku, 25(6), p.390 - 393, 1990/00
no abstracts in English
