Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil
The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out on the CS insert under End-of-Burn condition at 12.5 T...
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Veröffentlicht in: | TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 2016/04/25, Vol.51(4), pp.122-128 |
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creator | SUWA, Tomone OZEKI, Hidemasa NABARA, Yoshihiro SAITO, Toru KAWANO, Katsumi TAKAHASHI, Yoshikazu ISONO, Takaaki NUNOYA, Yoshihiko |
description | The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out on the CS insert under End-of-Burn condition at 12.5 T and 45.1 kA of after 16,000 cycles. External heat was applied at nearly the center of the CS insert using an inductive heater, and quench was induced. A current of 45.1 kA was dumped 9.5 s (7 s) after voltage generation (Quench detection, QD). The Normal zone propagation length reached 23.4 m, and the maxim propagation velocity was 3.1 m/s just before dumping. Considering the distribution of temperature, which is calculated by GANDALF, hot spot temperature was expected to reach 227 K. As the result, it was found that the hot spot temperature exceeded the criteria of 150 K which is designed on ITER. However, heating the CS insert to 227 K did not influence conductor performance, because the current sharing temperature was maintained after the quench test. Therefore, the quench detection has a margin of approximately 9.5 s (7 s) after voltage generation (QD) in view of the conductor performance under the conditions applied in this quench test. If the hot spot temperature is kept to less than 150 K, the current should be dumped 7.5 s (5 s) before voltage generation (QD). These results are very useful for designing quench protection of the ITER CS. |
doi_str_mv | 10.2221/jcsj.51.122 |
format | Article |
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In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out on the CS insert under End-of-Burn condition at 12.5 T and 45.1 kA of after 16,000 cycles. External heat was applied at nearly the center of the CS insert using an inductive heater, and quench was induced. A current of 45.1 kA was dumped 9.5 s (7 s) after voltage generation (Quench detection, QD). The Normal zone propagation length reached 23.4 m, and the maxim propagation velocity was 3.1 m/s just before dumping. Considering the distribution of temperature, which is calculated by GANDALF, hot spot temperature was expected to reach 227 K. As the result, it was found that the hot spot temperature exceeded the criteria of 150 K which is designed on ITER. However, heating the CS insert to 227 K did not influence conductor performance, because the current sharing temperature was maintained after the quench test. Therefore, the quench detection has a margin of approximately 9.5 s (7 s) after voltage generation (QD) in view of the conductor performance under the conditions applied in this quench test. If the hot spot temperature is kept to less than 150 K, the current should be dumped 7.5 s (5 s) before voltage generation (QD). These results are very useful for designing quench protection of the ITER CS.</description><identifier>ISSN: 0389-2441</identifier><identifier>EISSN: 1880-0408</identifier><identifier>DOI: 10.2221/jcsj.51.122</identifier><language>eng</language><publisher>CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN</publisher><subject>cable-in-conduit conductor ; central solenoid normal ; hot spot temperature ; ITER ; normal zone propagation ; Some figures in this article may appear in colour only in the electronic version</subject><ispartof>TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan), 2016/04/25, Vol.51(4), pp.122-128</ispartof><rights>2016 by Cryogenics and Superconductivity Society of Japan (Cryogenic Association of Japan)</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c1702-ca6e19cb2c20797303e4fe8c10cd3273828389c22eb9d13b0424423d624e503c3</citedby><cites>FETCH-LOGICAL-c1702-ca6e19cb2c20797303e4fe8c10cd3273828389c22eb9d13b0424423d624e503c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1883,27924,27925</link.rule.ids></links><search><creatorcontrib>SUWA, Tomone</creatorcontrib><creatorcontrib>OZEKI, Hidemasa</creatorcontrib><creatorcontrib>NABARA, Yoshihiro</creatorcontrib><creatorcontrib>SAITO, Toru</creatorcontrib><creatorcontrib>KAWANO, Katsumi</creatorcontrib><creatorcontrib>TAKAHASHI, Yoshikazu</creatorcontrib><creatorcontrib>ISONO, Takaaki</creatorcontrib><creatorcontrib>NUNOYA, Yoshihiko</creatorcontrib><title>Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil</title><title>TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)</title><addtitle>TEION KOGAKU</addtitle><description>The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out on the CS insert under End-of-Burn condition at 12.5 T and 45.1 kA of after 16,000 cycles. External heat was applied at nearly the center of the CS insert using an inductive heater, and quench was induced. A current of 45.1 kA was dumped 9.5 s (7 s) after voltage generation (Quench detection, QD). The Normal zone propagation length reached 23.4 m, and the maxim propagation velocity was 3.1 m/s just before dumping. Considering the distribution of temperature, which is calculated by GANDALF, hot spot temperature was expected to reach 227 K. As the result, it was found that the hot spot temperature exceeded the criteria of 150 K which is designed on ITER. However, heating the CS insert to 227 K did not influence conductor performance, because the current sharing temperature was maintained after the quench test. Therefore, the quench detection has a margin of approximately 9.5 s (7 s) after voltage generation (QD) in view of the conductor performance under the conditions applied in this quench test. If the hot spot temperature is kept to less than 150 K, the current should be dumped 7.5 s (5 s) before voltage generation (QD). These results are very useful for designing quench protection of the ITER CS.</description><subject>cable-in-conduit conductor</subject><subject>central solenoid normal</subject><subject>hot spot temperature</subject><subject>ITER</subject><subject>normal zone propagation</subject><subject>Some figures in this article may appear in colour only in the electronic version</subject><issn>0389-2441</issn><issn>1880-0408</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNo9kE1Lw0AQhhdRsNSe_AN7l9TZ2XxehBKqLRQVUy9els1mUlPSbNiNh_57U1p6mTm8zwwzD2OPAuaIKJ73xu_nkZgLxBs2EWkKAYSQ3rIJyDQLMAzFPZt535QAkMUiinHCikWn26NvPLc1f7fuoFv-Yzvin872eqeHxnZcdxVf2YEX_Vi2dOjJ6eHPER-z9Xb5xfOCrztPbuC5bdoHdlfr1tPs0qfs-3W5zVfB5uNtnS82gREJYGB0TCIzJRqEJEskSAprSo0AU0lMZIrpeLdBpDKrhCwhHF9AWcUYUgTSyCl7Ou81znrvqFa9aw7aHZUAdVKiTkpUJNSoZKRfzvTeD3pHV1a7oTEtXdnwMnANzK92ijr5D0hnaXo</recordid><startdate>20160425</startdate><enddate>20160425</enddate><creator>SUWA, Tomone</creator><creator>OZEKI, Hidemasa</creator><creator>NABARA, Yoshihiro</creator><creator>SAITO, Toru</creator><creator>KAWANO, Katsumi</creator><creator>TAKAHASHI, Yoshikazu</creator><creator>ISONO, Takaaki</creator><creator>NUNOYA, Yoshihiko</creator><general>CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20160425</creationdate><title>Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil</title><author>SUWA, Tomone ; OZEKI, Hidemasa ; NABARA, Yoshihiro ; SAITO, Toru ; KAWANO, Katsumi ; TAKAHASHI, Yoshikazu ; ISONO, Takaaki ; NUNOYA, Yoshihiko</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c1702-ca6e19cb2c20797303e4fe8c10cd3273828389c22eb9d13b0424423d624e503c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>cable-in-conduit conductor</topic><topic>central solenoid normal</topic><topic>hot spot temperature</topic><topic>ITER</topic><topic>normal zone propagation</topic><topic>Some figures in this article may appear in colour only in the electronic version</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SUWA, Tomone</creatorcontrib><creatorcontrib>OZEKI, Hidemasa</creatorcontrib><creatorcontrib>NABARA, Yoshihiro</creatorcontrib><creatorcontrib>SAITO, Toru</creatorcontrib><creatorcontrib>KAWANO, Katsumi</creatorcontrib><creatorcontrib>TAKAHASHI, Yoshikazu</creatorcontrib><creatorcontrib>ISONO, Takaaki</creatorcontrib><creatorcontrib>NUNOYA, Yoshihiko</creatorcontrib><collection>CrossRef</collection><jtitle>TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SUWA, Tomone</au><au>OZEKI, Hidemasa</au><au>NABARA, Yoshihiro</au><au>SAITO, Toru</au><au>KAWANO, Katsumi</au><au>TAKAHASHI, Yoshikazu</au><au>ISONO, Takaaki</au><au>NUNOYA, Yoshihiko</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil</atitle><jtitle>TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)</jtitle><addtitle>TEION KOGAKU</addtitle><date>2016-04-25</date><risdate>2016</risdate><volume>51</volume><issue>4</issue><spage>122</spage><epage>128</epage><pages>122-128</pages><issn>0389-2441</issn><eissn>1880-0408</eissn><abstract>The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out on the CS insert under End-of-Burn condition at 12.5 T and 45.1 kA of after 16,000 cycles. External heat was applied at nearly the center of the CS insert using an inductive heater, and quench was induced. A current of 45.1 kA was dumped 9.5 s (7 s) after voltage generation (Quench detection, QD). The Normal zone propagation length reached 23.4 m, and the maxim propagation velocity was 3.1 m/s just before dumping. Considering the distribution of temperature, which is calculated by GANDALF, hot spot temperature was expected to reach 227 K. As the result, it was found that the hot spot temperature exceeded the criteria of 150 K which is designed on ITER. However, heating the CS insert to 227 K did not influence conductor performance, because the current sharing temperature was maintained after the quench test. Therefore, the quench detection has a margin of approximately 9.5 s (7 s) after voltage generation (QD) in view of the conductor performance under the conditions applied in this quench test. If the hot spot temperature is kept to less than 150 K, the current should be dumped 7.5 s (5 s) before voltage generation (QD). These results are very useful for designing quench protection of the ITER CS.</abstract><pub>CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN</pub><doi>10.2221/jcsj.51.122</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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subjects | cable-in-conduit conductor central solenoid normal hot spot temperature ITER normal zone propagation Some figures in this article may appear in colour only in the electronic version |
title | Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil |
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