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Results of the Excitation Test of the LHD Helical Coils Cooled by Subcooled Helium

http://hdl.handle.net/10655/3790
http://hdl.handle.net/10655/3790
56801c09-c42f-4339-bbea-a84652fe2e46
名前 / ファイル ライセンス アクション
VoR_IEEE.Tran.Appl.Sup_18_455.pdf VoR_IEEE.Tran.Appl.Sup_18_455 (995.9 kB)
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Item type 学術雑誌論文 / Journal Article_02(1)
公開日 2010-03-04
タイトル
タイトル Results of the Excitation Test of the LHD Helical Coils Cooled by Subcooled Helium
言語 en
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
著者 Imagawa, S.

× Imagawa, S.

en Imagawa, S.

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OBANA, T.

× OBANA, T.

en OBANA, T.


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Hamaguchi, S.

× Hamaguchi, S.

en Hamaguchi, S.

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Yanagi, N.

× Yanagi, N.

en Yanagi, N.

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Mito, T.

× Mito, T.

en Mito, T.

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Moriuchi, S.

× Moriuchi, S.

en Moriuchi, S.

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Sekiguchi, H.

× Sekiguchi, H.

en Sekiguchi, H.

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Ooba, K.

× Ooba, K.

en Ooba, K.

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Okamura, T.

× Okamura, T.

en Okamura, T.

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Komori, A.

× Komori, A.

en Komori, A.

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Motojima, O.

× Motojima, O.

en Motojima, O.

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抄録
内容記述タイプ Abstract
内容記述 Large helical device, the largest superconducting stellarator, has been operated for the research of fusion plasma since 1998. The toroidal field of almost 3 T is produced by a pair of pool-cooled helical coils, in the innermost layers of which a normal-zone had been induced several times at the bottom of the coil at higher currents than 11.0 kA. Since the field is not the highest there, the local cooling conditions are probably deteriorated by bubbles gathered by buoyancy. In order to improve the cryogenic stability by subcooling, an additional cooler with two-stage cold compressors was installed at the inlet of the coil in 2006. The inlet and outlet temperatures of the coils were successfully lowered to 3.2 K and 3.8 K, respectively, with a mass flow of 50 g/s. In spite of a half charging rate to reduce AC losses, a normal-zone was induced near the top of the coil at 11.45 kA. It propagated to one side and stopped near the inner equator, where the field is the highest. In comparison with the stability tests with a model coil, the local temperatures of the innermost layers near the top is considered to have been raised up to almost the saturated temperature of 4.4 K by charging. The excitation method was revised to waiting cool-down at 11.0 kA, and the excitations up to 11.5 kA have been attained.
書誌情報 en : IEEE Transactions on Applied Superconductivity

巻 Vol.18, 号 Issue 2, p. pp.455 - 458, 発行日 2008-06-01
出版者
出版者 IEEE
DOI
関連タイプ isIdenticalTo
識別子タイプ DOI
関連識別子 10.1109/TASC.2008.921977
権利
権利情報 ? 2008 IEEE
関連サイト
識別子タイプ DOI
関連識別子 https://doi.org/10.1109/TASC.2008.921977
関連名称 Publisher version
著者版フラグ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
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Cite as

Imagawa, S., OBANA, T., Hamaguchi, S., Yanagi, N., Mito, T., Moriuchi, S., Sekiguchi, H., Ooba, K., Okamura, T., Komori, A., Motojima, O., 2008, Results of the Excitation Test of the LHD Helical Coils Cooled by Subcooled Helium: IEEE, pp.455 - 458- p.

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