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Journal Articles

Thermal stability of butt joint for CS conductor in JT-60SA

Takao, Tomoaki*; Kawahara, Yuzuru*; Nakamura, Kazuya*; Yamamoto, Yusuke*; Yagai, Tsuyoshi*; Murakami, Haruyuki; Yoshida, Kiyoshi; Natsume, Kyohei*; Hamaguchi, Shinji*; Obana, Tetsuhiro*; et al.

IEEE Transactions on Applied Superconductivity, 24(3), p.4800804_1 - 4800804_4, 2014/06

 Times Cited Count:3 Percentile:24.77(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Analysis of contact length distribution of superconducting strands with copper sleeves at cable-in-conduit conductor joints

Nakazawa, Shinobu*; Teshima, Shotaro*; Arai, Daichi*; Miyagi, Daisuke*; Tsuda, Makoto*; Hamajima, Takataro*; Yagai, Tsuyoshi*; Nunoya, Yoshihiko; Koizumi, Norikiyo; Takahata, Kazuya*; et al.

Teion Kogaku, 46(8), p.474 - 480, 2011/08

It is observed that measured critical currents of a large current CIC conductor sample become lower than expected ones, since unbalanced current distribution is caused through contacting resistances between strands and Cu sleeves in CIC conductor joints. In order to evaluate the contacting length, we identify all strands 3 dimensional positions in the CIC conductor, and then we measure contacting number and lengths of strands which appear on surface of the cable for contacting with the Cu sleeves. It is found that some strands do not appear on the surface of cable and the contacting lengths are widely distributed with large standard deviation. We develop a numerical code which simulates strand positions in the CIC, and then compare the analyzed contacting strand number and contacting length with measured ones. It is found that the both results are in good agreement and hence the code is available for evaluating the contacting parameters. We vary twist pitches of sub-cables to search the contacting parameters and then show that all strands appear on the cable surface and have contacting lengths with small standard deviation. It is found that the twist pitches are a key parameter for optimization of the contacting parameters.

Journal Articles

Irregular loops with long time constants in CIC conductor

Yagai, Tsuyoshi*; Sato, Hidenari*; Tsuda, Makoto*; Hamajima, Takataro*; Nunoya, Yoshihiko; Takahashi, Yoshikazu; Okuno, Kiyoshi

IEEE Transactions on Applied Superconductivity, 16(2), p.835 - 838, 2006/06

 Times Cited Count:6 Percentile:38.57(Engineering, Electrical & Electronic)

AC losses in the CIC conductor consist of both regular loss that are proportional to cable twisting pitch squared and irregular loss that could not be estimated from short conductor sample results. It was explained from our previous works that irregular loops produce the losses with long time constants up to several hundred seconds. The observed long time constant indicates that contact conditions between the two strands forming the loop should be line contact. We traced the sample conductor with 1 m in length. The measured results show that large displacements of strands from their original positions due to compressing the conductor provide many line contacts. It is found that the averaged line contact length reaches about 10 mm that is three orders of magnitude larger than the 0.01 mm of point contact length.

Oral presentation

Analysis of all strand locations in a large superconducting CIC conductor

Sato, Hidenori*; Yagai, Tsuyoshi*; Tsuda, Makoto*; Hamajima, Takataro*; Nunoya, Yoshihiko; Okuno, Kiyoshi

no journal, , 

no abstracts in English

Oral presentation

Stability evaluation of joint in JT-60SA central solenoid

Kawahara, Yuzuru*; Yamamoto, Yusuke*; Nakamura, Kazuya*; Takao, Tomoaki*; Yagai, Tsuyoshi*; Murakami, Haruyuki; Yoshida, Kiyoshi; Natsume, Kyohei*; Hamaguchi, Shinji*; Obana, Tetsuhiro*; et al.

no journal, , 

no abstracts in English

5 (Records 1-5 displayed on this page)
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