Performance Analysis of Mass-Produced Nb sub(3)Sn Conductor for Central Solenoid in ITER

The performance of two mass-produced Nb sub(3)Sn conductors for the ITER central solenoids was tested for the first time. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductor...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2016-06, Vol.26 (4), p.1-5
Hauptverfasser: Nabara, Yoshihiro, Suwa, Tomone, Ozeki, Hidemasa, Kajitani, Hideki, Sakurai, Takeru, Hemmi, Tsutomu, Iguchi, Masahide, Nunoya, Yoshihiko, Takahashi, Yoshikazu, Isono, Takaaki, Matsui, Kunihiro, Koizumi, Norikiyo, Tsutsumi, Fumiaki, Uno, Yasuhiro, Oshikiri, Masayuki, Shibutani, Kazuyuki, Okuno, Kiyoshi, Murakami, Yukinobu, Takano, Tsuyoshi, Sedlak, Kamil, Stepanov, Boris, Bruzzone, Pierluigi
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container_title IEEE transactions on applied superconductivity
container_volume 26
creator Nabara, Yoshihiro
Suwa, Tomone
Ozeki, Hidemasa
Kajitani, Hideki
Sakurai, Takeru
Hemmi, Tsutomu
Iguchi, Masahide
Nunoya, Yoshihiko
Takahashi, Yoshikazu
Isono, Takaaki
Matsui, Kunihiro
Koizumi, Norikiyo
Tsutsumi, Fumiaki
Uno, Yasuhiro
Oshikiri, Masayuki
Shibutani, Kazuyuki
Okuno, Kiyoshi
Murakami, Yukinobu
Takano, Tsuyoshi
Sedlak, Kamil
Stepanov, Boris
Bruzzone, Pierluigi
description The performance of two mass-produced Nb sub(3)Sn conductors for the ITER central solenoids was tested for the first time. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures $T_{cs}$ were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The $T_{cs}$ of the former conductor increased and became almost constant through the cycling. In contrast, $T_{cs}$ of the latter conductor not only increased but also decreased slightly against cycling. The $T_{cs}$ decline rate after 10 002 cycles was $-4.50\times 10-6}\ \text{K/cycle}$. If this rate is assumed to continue after 20 000 cycles, $T_{cs}$ would decrease by -0.27 K over 60 000 cycles. Even so, $T_{cs}$ is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses $Q$ of both conductors at a current of 0 kA were almost the same as or slightly lower than $Q$ of a short sample conductor whose fifth-stage twist pitch was not lengthen. On each conductor, $Q$ at 40 kA was approximately 10% higher than that at 0 kA; thus, the effect of the transport current on $Q$ was not large.
doi_str_mv 10.1109/TASC.2016.2518640
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One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures $T_{cs}$ were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The $T_{cs}$ of the former conductor increased and became almost constant through the cycling. In contrast, $T_{cs}$ of the latter conductor not only increased but also decreased slightly against cycling. The $T_{cs}$ decline rate after 10 002 cycles was $-4.50\times 10-6}\ \text{K/cycle}$. If this rate is assumed to continue after 20 000 cycles, $T_{cs}$ would decrease by -0.27 K over 60 000 cycles. Even so, $T_{cs}$ is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses $Q$ of both conductors at a current of 0 kA were almost the same as or slightly lower than $Q$ of a short sample conductor whose fifth-stage twist pitch was not lengthen. 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One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures $T_{cs}$ were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The $T_{cs}$ of the former conductor increased and became almost constant through the cycling. In contrast, $T_{cs}$ of the latter conductor not only increased but also decreased slightly against cycling. The $T_{cs}$ decline rate after 10 002 cycles was $-4.50\times 10-6}\ \text{K/cycle}$. If this rate is assumed to continue after 20 000 cycles, $T_{cs}$ would decrease by -0.27 K over 60 000 cycles. Even so, $T_{cs}$ is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses $Q$ of both conductors at a current of 0 kA were almost the same as or slightly lower than $Q$ of a short sample conductor whose fifth-stage twist pitch was not lengthen. 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One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures $T_{cs}$ were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The $T_{cs}$ of the former conductor increased and became almost constant through the cycling. In contrast, $T_{cs}$ of the latter conductor not only increased but also decreased slightly against cycling. The $T_{cs}$ decline rate after 10 002 cycles was $-4.50\times 10-6}\ \text{K/cycle}$. If this rate is assumed to continue after 20 000 cycles, $T_{cs}$ would decrease by -0.27 K over 60 000 cycles. Even so, $T_{cs}$ is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses $Q$ of both conductors at a current of 0 kA were almost the same as or slightly lower than $Q$ of a short sample conductor whose fifth-stage twist pitch was not lengthen. On each conductor, $Q$ at 40 kA was approximately 10% higher than that at 0 kA; thus, the effect of the transport current on $Q$ was not large.</abstract><doi>10.1109/TASC.2016.2518640</doi></addata></record>
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subjects Conductors (devices)
Conduits
Constants
Current sharing
Cycles
Insertion
Solenoids
Superconductivity
title Performance Analysis of Mass-Produced Nb sub(3)Sn Conductor for Central Solenoid in ITER
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