Summary of a 1 MJ conduction-cooled LTS pulse coil developed for 1 MW, 1 s UPS-SMES

Toshiyuki Mito; Hirotaka Chikaraishi; Akifumi Kawagoe; Ryuji Maekawa; Ryo Abe; Tomosumi Baba; Kagao Okumura; Atsuko Kuge; Masataka Iwakuma; Fumio Sumiyoshi

doi:10.1109/TASC.2009.2018480

Summary of a 1 MJ conduction-cooled LTS pulse coil developed for 1 MW, 1 s UPS-SMES

Toshiyuki Mito
, Hirotaka Chikaraishi
, Akifumi Kawagoe
, Ryuji Maekawa
, Ryo Abe
, Tomosumi Baba
, Kagao Okumura
, Atsuko Kuge
, Masataka Iwakuma
, Fumio Sumiyoshi

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The development study of a 1 MJ conduction-cooled low temperature superconducting (LTS) pulse coil used for a 1 MW, 1 s UPS-SMES is summarized. We have developed a conduction-cooled LTS pulse coil as a key technology for the UPS-SMES. The AC loss reduction and the high stability are required for the SC conductor for a LTS pulse coil because of a limited cooling capacity of 4 K cryocooler. The conductor of a NbTi/Cu compacted strand cable extruded with an aluminum was designed to have the anisotropic AC loss properties to minimize the coupling loss. The coil was wound, utilizing a specially developed automatic winding machine which enables an innovative twist-winding method. The Dyneema FRP (DFRP) spacers and the Litz wires (braided wires of insulated copper strands) were inserted in each layer in order to enhance the heat transfer in the coil windings. The coil was installed in the test cryostat and was connected to three GM cryocoolers, which have a total cooling capacity of 4.5 W at 4 K and 240 W at 50 K. The coil was cooled conductively without liquid helium by attaching the end of the Litz wires directly to the cold heads of the cryocoolers. The cooling and excitation test of the 1 MJ coil has been done successfully. The test results validated the high performance of the conduction-cooled LTS pulse coil, because the high thermal diffusivity resulted in the rapid temperature stabilization in the coil.

Original language	English
Article number	5109586
Pages (from-to)	1999-2003
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	19
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2009.2018480
State	Published - Jun 2009
Externally published	Yes

Funding

Manuscript received August 26, 2008. First published June 23, 2009; current version published July 15, 2009. This work was supported by NIFS (NIFS05ULAA102), the Grand of NEDO, and the Grand-in-Aid for Scientific Research (16206028). T. Mito, H. Chikaraishi, R. Maekawa, and T. Baba are with the National Institute for Fusion Science, 322-6, Oroshi-cho, Toki, Gifu 509-5292, Japan (e-mail: [email protected]). A. Kawagoe and F. Sumiyoshi are with Kagoshima University, 1-21-40 Ko-rimoto, Kagoshima 890-0065, Japan. R. Abe is with the Shibuya Kogyo Co., Ltd., Mameda-honmachi, Kanazawa, 920-8681, Japan. K. Okumura is with JSO, Inc. and the Tokyo University of Marine Science and Technology, 2-1-6, Etchujima, Koto-ku, Tokyo 135-8533, Japan. A. Kuge is with Technova Inc., 1-1, Uchisaiwai-cho 1-chome, Chiyoda-ku, Tokyo 100-0011, Japan. M. Iwakuma is with Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2009.2018480

Keywords

Conduction cooled
LTS
Pulse coil
UPS-SMES

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10.1109/TASC.2009.2018480

Cite this

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abstract = "The development study of a 1 MJ conduction-cooled low temperature superconducting (LTS) pulse coil used for a 1 MW, 1 s UPS-SMES is summarized. We have developed a conduction-cooled LTS pulse coil as a key technology for the UPS-SMES. The AC loss reduction and the high stability are required for the SC conductor for a LTS pulse coil because of a limited cooling capacity of 4 K cryocooler. The conductor of a NbTi/Cu compacted strand cable extruded with an aluminum was designed to have the anisotropic AC loss properties to minimize the coupling loss. The coil was wound, utilizing a specially developed automatic winding machine which enables an innovative twist-winding method. The Dyneema FRP (DFRP) spacers and the Litz wires (braided wires of insulated copper strands) were inserted in each layer in order to enhance the heat transfer in the coil windings. The coil was installed in the test cryostat and was connected to three GM cryocoolers, which have a total cooling capacity of 4.5 W at 4 K and 240 W at 50 K. The coil was cooled conductively without liquid helium by attaching the end of the Litz wires directly to the cold heads of the cryocoolers. The cooling and excitation test of the 1 MJ coil has been done successfully. The test results validated the high performance of the conduction-cooled LTS pulse coil, because the high thermal diffusivity resulted in the rapid temperature stabilization in the coil.",

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AB - The development study of a 1 MJ conduction-cooled low temperature superconducting (LTS) pulse coil used for a 1 MW, 1 s UPS-SMES is summarized. We have developed a conduction-cooled LTS pulse coil as a key technology for the UPS-SMES. The AC loss reduction and the high stability are required for the SC conductor for a LTS pulse coil because of a limited cooling capacity of 4 K cryocooler. The conductor of a NbTi/Cu compacted strand cable extruded with an aluminum was designed to have the anisotropic AC loss properties to minimize the coupling loss. The coil was wound, utilizing a specially developed automatic winding machine which enables an innovative twist-winding method. The Dyneema FRP (DFRP) spacers and the Litz wires (braided wires of insulated copper strands) were inserted in each layer in order to enhance the heat transfer in the coil windings. The coil was installed in the test cryostat and was connected to three GM cryocoolers, which have a total cooling capacity of 4.5 W at 4 K and 240 W at 50 K. The coil was cooled conductively without liquid helium by attaching the end of the Litz wires directly to the cold heads of the cryocoolers. The cooling and excitation test of the 1 MJ coil has been done successfully. The test results validated the high performance of the conduction-cooled LTS pulse coil, because the high thermal diffusivity resulted in the rapid temperature stabilization in the coil.

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Summary of a 1 MJ conduction-cooled LTS pulse coil developed for 1 MW, 1 s UPS-SMES

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