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Hamada, Kazuya; Nakajima, Hideo; Kawano, Katsumi; Takano, Katsutoshi*; Tsutsumi, Fumiaki*; Seki, Shuichi*; Okuno, Kiyoshi; Fujitsuna, Nobuyuki*; Mizoguchi, Mitsuru*
IEEE Transactions on Applied Superconductivity, 16(2), p.787 - 790, 2006/06
Times Cited Count：6 Percentile：37.33(Engineering, Electrical & Electronic)no abstracts in English
Nunoya, Yoshihiko; Isono, Takaaki; Okuno, Kiyoshi
IEEE Transactions on Applied Superconductivity, 14(2), p.1468 - 1472, 2004/06
Times Cited Count：45 Percentile：83.44(Engineering, Electrical & Electronic)The voltage temperature characteristic curve (V-T curve) observed in the large-current Nb
Sn CIC conductor, which was used in the ITER CS Insert, showed a gradual take-off toward normal state as compared with the V-T curve of an individual strand composing the conductor. The gradual take-off corresponds to the reduction in so-called "n-value." In addition, the take-off shifted to lower temperature than that of the strand, namely lower current sharing temperature (Tcs) or lower critical current (Ic). These behaviors cannot be explained by non-uniform magnetic field accompanying enlargement of the conductor, or by non-uniform contact resistance of the conductor terminals. Investigation is therefore required to clarify the condition of each strand in such large CIC conductor, especially in terms of the strain state under large electromagnetic force. In a CIC conductor, since strands are twisted to form a cable, each strand is mechanically supported by a nearby strand at an interval related to the twist pitch. Between two supporting points, the strand is fee to move under transverse force and a cyclic deformation will occur along the strand length. We designed the apparatus to simulate this cyclic deformation and measured the V-T characteristic of the strand. When the strand received the transverse force of about 500 N/m, n-value reduced to one-fifth (about 6) of the original value, which corresponds to that observed in the CS Insert. The level of the force agreed to the electromagnetic force when the CS Insert was energized to 46 kA at 13 T (about 40 A each strand 
13 T = 520 N/m). This suggests that the transverse force acting on each strand can explain the behavior of the V-T curve of the large-current CIC conductor.
Takahashi, Yoshikazu; Yoshida, Kiyoshi; Mitchell, N.*; Bessette, D.*; Nunoya, Yoshihiko; Matsui, Kunihiro; Koizumi, Norikiyo; Isono, Takaaki; Okuno, Kiyoshi
IEEE Transactions on Applied Superconductivity, 14(2), p.1410 - 1413, 2004/06
Times Cited Count：10 Percentile：48.21(Engineering, Electrical & Electronic)Cable-in-conduit conductors that consist of about 1,000 NbSn strands with an outer diameter of about 0.8mm, have been designed for the TF and CS coils of the ITER. The rated current of these coils is 40 -68kA. Two joint types (Butt and Lap) were developed during the CS Model Coil project. The performance of these joints was evaluated during the operating tests and the satisfied results were obtained. The joints of the TF coils are located outside of the winding in a region where the magnetic field is about 2.1T, a very low value as compared to the maximum field of 11.8T at the winding. The CS joints are located at the coil outer diameter and embedded within the winding pack due to the lack of the space. The maximum fields at the CS joint and winding are 3.5 and 13T, respectively. For the TF coils and the CS, the joints are cooled in series with the conductor at the outlet. The maximum temperature increase due to the joule heating in the joints is set at 0.15K to limit the heat load on the refrigerator. It is shown that both joint types are applicable to the ITER coils.
Sn cable-in-conduit conductors*; Ando, Toshinari; Nakajima, Hideo; Nishi, Masataka; Hiue, Hisaaki*; Yasukawa, Yukio*; Tsuji, Hiroshi
JAERI-M 93-065, 13 Pages, 1993/03
no abstracts in English
Sn cable-in-conduit conductorsJ.R.Armstrong*
JAERI-M 92-013, 70 Pages, 1992/02
no abstracts in English
Sn demo poloidal coil(DPC-EX)Ando, Toshinari; Takahashi, Yoshikazu; Okuno, Kiyoshi; Tsuji, Hiroshi; Hiyama, Tadao; Nishi, Masataka; Tada, Eisuke; Yoshida, Kiyoshi; Koizumi, Norikiyo; Nakajima, Hideo; et al.
IEEE Transactions on Magnetics, 28(1), p.206 - 209, 1992/01
Times Cited Count：4 Percentile：47.74(Engineering, Electrical & Electronic)no abstracts in English
Sn cable-in-conduit conductorAndo, Toshinari; Nishi, Masataka; Shimamoto, Susumi
IEEE Transactions on Magnetics, 25(2), p.2386 - 2389, 1989/03
Times Cited Count：11 Percentile：70.83(Engineering, Electrical & Electronic)no abstracts in English
