Development of a superconducting joint technique between CIC conductors for poloidal coil of large helical device (LHD)

Hanawa, S.; Wachi, Y.; Shibayama, K.; Shibuya, Junichi; Mizumaki, S.; Yamamoto, Takeshi; Nakamoto, K.; Kai, Tetsuya; Takahata, K.; Yamamoto, Junya; Satow, T.; Motojima, O.

doi:10.1109/77.402658

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…The Cu/SC ratio of the strand is 2.7. Short sample characteristics of several strands and two CICCs were measured [4]. The strand has about three times the ratio IC / I o p at 4.5 K. A group of NbTi filaments is placed nearer by the center of the strand as possible of fabrication.…”

Section: B Superconductor For the I V Coilsmentioning

confidence: 99%

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Cooling and excitation tests of an inner vertical coil for the Large Helical Device

et al. 1996

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The Large Helical Device (W) mQr constnrtion at NIFS is a nuclear fusion experimental device consisting of two superconducting helical coils andthree pails of poloidal coils. A pairof innervertical (IV) coils with a combined stored energy of 161 MJ have been deliveredto NIFS. They were the 4 m outside dameter coils wound fmm cable-in-conclit conductors composed of 486 strands with a copper matrix. We conducted supercritical helium cooling and excitation tests to confirm the cooling and superconducting characteristics of one of the IV coils before its assembly into the LHD cryostat in 1997. It has been assembled into the SHe test facility at the Toki site of NIB, and was cooled down andenergizedto 2.2 kA in Febnary and iWmh 1995. The test facility will be repairedin part, and the coil will be tested to confirmthechatactenstics at the rated current of 20.8 kA within the year.

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Section: B Superconductor For the I V Coilsmentioning

confidence: 99%

“…2. Each superconducting joint between doublepancakes was made using the solid-state bonding technique [4]. Critical current measurement of a sample joint showed that it remained in the superconducting state at the rated current of 20.8 kA in Phase-11.…”

Section: I V-l Coilmentioning

confidence: 99%

Cooling and excitation tests of an inner vertical coil for the Large Helical Device

et al. 1996

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“…The specifications of the coil are listed in Table TI Seven conductor joints are manged outside and become the outlets of the coolant In the joints, the solid state bonding technique, where the Nb-Ti filaments are directly jointed, is applied to make the joints compact and to reduce error field [3,4]. The coolant retums through insulation pipes and a manifold.…”

Section: Conductor and Coilmentioning

confidence: 99%

Excitation test results on a single inner vertical coil for the Large Helical Device

Takahata

Mito

Satow

et al. 1997

IEEE Trans. Appl. Supercond.

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A b s t r a c t Excitation experiments on a single inner vertical coil for the Large Helical Device (LHD) were carried out to confirm ifs performance. The coil is one of the LHD's poloidal field coils and consists of a forced-flow Nb-Ti cable-in-conduit conductor (CICC). After cooldown for 250 hours, the superconducting transition of the whole coil was confirmed. Pressure drops were measured during the cooldown to determine the coil's hydraulic characteristics. Then, the coil was successfully energized up to the specified current, 20.8 kA. In the experiments, heat generation of joints, radial displacement and acoustic emission (AE) were measured.

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Design and Construction of Cryogenic Components for LHD

Satoh

Mito

Yamada

et al. 1997

Proceedings of the Sixteenth International Cryogenic Engineering Conference/International Cryogenic Materials Conference

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Development of a superconducting joint technique between CIC conductors for poloidal coil of large helical device (LHD)

Cited by 7 publications

References 2 publications

Cooling and excitation tests of an inner vertical coil for the Large Helical Device

Cooling and excitation tests of an inner vertical coil for the Large Helical Device

Excitation test results on a single inner vertical coil for the Large Helical Device

Design and Construction of Cryogenic Components for LHD

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