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Journal Articles

Evaluation method of critical current and current sharing temperature for large-current Cable-in-Conduit conductors

Nunoya, Yoshihiko; Isono, Takaaki; Sugimoto, Makoto; Takahashi, Yoshikazu; Nishijima, Gen*; Matsui, Kunihiro; Koizumi, Norikiyo; Ando, Toshinari*; Okuno, Kiyoshi

IEEE Transactions on Applied Superconductivity, 13(2), p.1404 - 1407, 2003/06

 Times Cited Count:10 Percentile:49.54(Engineering, Electrical & Electronic)

Analysis of critical current ($$I_c$$) and current sharing temperature ($$T_{cs}$$) was performed to the ITER Center Solenoid (ITER-CS) Model Coil Insert. Voltage behavior related to normal state transition of the conductor during $$I_c$$ or $$T_{cs}$$ measurement has not been well understood especially in case of such a large cable with more than one thousand strands as this coil. From the detailed analysis of the voltage behavior of the coil, it is found that the average of electric field in the strand-longitudinal direction over the conductor cross section is equal to the average field of one strand along the conductor length, whose integral was measured by the voltage taps during the coil test. It is because twist pitch of the cable is less than the range of longitudinal field variation in this case. This evaluation method can estimate voltage behavior and predict $$I_c$$ and $$T_{cs}$$ values, which are important parameters for the design of a large conductor coil, based on the property of strands composing the conductor.

Journal Articles

Current sharing temperature of the ITER-TF insert

Nunoya, Yoshihiko; Sugimoto, Makoto; Isono, Takaaki; Hamada, Kazuya; Matsui, Kunihiro; Okuno, Kiyoshi; CS Model Coil Test Group

Teion Kogaku, 37(10), p.523 - 530, 2002/10

Vurrent sharing temperature (Tcs) measurement of ITER toroidal field insert was performed. The coil is Nb$$_3$$Sn superconducting coil and was installed inside of the ITER CS model coil as a backup field coil. Relation between the voltage of individual strand composing TF insert conductor and the measured voltage using the taps on the jacket is investigated and the evaluation method for Tcs measurement was established. The obtained results shows that there was discrepancy between the expected value from the strand data and the measured value which is lower by about 1.2K. Some discrepancy was already observed just after cool down of the insert before energizing.

Journal Articles

Test results of the SMES model coil; DC electromagnetic performance

Isono, Takaaki; Nunoya, Yoshihiko; Hamada, Kazuya; Matsui, Kunihiro; Sugimoto, Makoto; Koizumi, Norikiyo; *; *; *; *; et al.

Teion Kogaku, 33(7), p.473 - 478, 1998/00

no abstracts in English

Journal Articles

Consideration of current sharing temperature measurement for ITER CS model coil

*; Ando, Toshinari; Tsuji, Hiroshi; Shimamoto, Susumi

Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.787 - 790, 1996/00

no abstracts in English

Journal Articles

Development of a high-current superconductor

Takahashi, Yoshikazu

Purazuma, Kaku Yugo Gakkai-Shi, 69(6), p.610 - 614, 1993/06

no abstracts in English

Journal Articles

Experimental results of stability and current sharing of NbTi cable-in-conduit conductors for the poloidal field coils

Takahashi, Yoshikazu; Koizumi, Norikiyo; *; Okuno, Kiyoshi; Nishi, Masataka; Isono, Takaaki; Yoshida, Kiyoshi; Sugimoto, Makoto; Kato, Takashi; *; et al.

IEEE Transactions on Applied Superconductivity, 3(1), p.610 - 613, 1993/03

 Times Cited Count:12 Percentile:69.75(Engineering, Electrical & Electronic)

no abstracts in English

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