Analysis of Discharging Characteristics in a Bi-2223/Ag Coil for SMES With Consideration of Cooling Capacity of a Cryocooler

Higashikawa, Kohei; Nakamura, Taketsune; Okamoto, Hiroshi

doi:10.1109/tasc.2006.870008

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…The first author's group has also performed the analytical study with the use of the above-mentioned model for HTS coils [19][20][21][22][23][24][25] and HTS cables 26,27) . In this paper, variables T i and e i are not subjected to the consideration.…”

Section: Current Transport Property Of Hts Apparatusesmentioning

confidence: 99%

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

et al. 2014

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In this paper, we studied the DC current transport properties of GdBCO-coated conductors, including the longitudinal distribution of critical current. Inhomogeneity of the local critical current was firstly measured by means of TapeStar™ at 77 K, and then characterized based on a statistical method. Current transport properties were also measured for different positions and/or distances of potential taps using a four-probe method. It was shown that the longitudinal inhomogeneity of the conductor was described by use of a simplified percolation depinning model that takes account of Gaussian distribution. We further distinguished the above-mentioned inhomogeneity between statistical distribution and random failure. Influence of the aforementioned statistically distributed current transport properties on the magnet performance was also elucidated for simple pancake coils. This information is important as it provides guidance for practical system design.

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Section: Current Transport Property Of Hts Apparatusesmentioning

confidence: 99%

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

et al. 2014

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“…(1) Electric field E (μV/m) [19][20][21][22][23][24][25][26][27] ࠾࠸࡚᭱ಙᆇᛶࡢ࠸ ো౯ᘧࡋ࡚ᮌᅢࡢ࣮ࢥ࣮ࣞࢩࣙࣥഴ⛣ࣔࢹࣝ [14][15][16] ⏝ࡋ࡚ࡁࡓࠋࡋࡋ࡞ࡀ ᭱Ǻⓗࡣୖঠࣔࢹࣝ ( )…”

Section: ୍᪉ᮏ÷࡛ࡍ࿇ᡭ᪉ྥᆒ୍ᛶࡣᕧख़ⓗ࡞ोᅉunclassified

Longitudinal Inhomogeneity of DC Current Transport Properties in Gd-system HTS Tapes

Nakamura¹,

Takamura²,

Amemiya³

et al. 2013

TEION KOGAKU

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Synopsis:In this paper, we studied the DC current transport properties of GdBCO-coated conductors, including the longitudinal distribution of critical current. Inhomogeneity of the local critical current was firstly measured by means of TapeStar™ at 77 K, and then characterized based on a statistical method. Current transport properties were also measured for different positions and/or distances of potential taps using a four-probe method. It was shown that the longitudinal inhomogeneity of the conductor was described by use of a simplified percolation depinning model that takes account of Gaussian distribution.We further distinguished the above-mentioned inhomogeneity between statistical distribution and random failure. Influence of the aforementioned statistically distributed current transport properties on the magnet performance was also elucidated for simple pancake coils. This information is important as it provides guidance for practical system design.

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“…Furthermore, we assure that the stress does not exceed the elastic limit of the Hastelloy in this design. Then the strain caused in the conductor is calculated by (7) where is Young's modulus of the Hastelloy [18]. We investigate the influence of the hoop stress on the transport performance of the coil by considering (6), (7) into (1)- (5).…”

Section: B Modelmentioning

confidence: 99%

“…Given this factor, we have developed an optimal design method of a YBCO coil taking account of the mechanical properties in the conductor. The transport performance of the coil is calculated by means of finite element method [6], [7], and the configuration of the coil is optimized by genetic algorithm [8], [9]. By this method, we have carried out a conceptual design of a 2 GJ class SMES coil using a MOCVD-YBCO coated conductor, and discussed the influence of the mechanical properties on the optimal configuration.…”

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confidence: 99%

Performance Improvement of YBCO Coil for High-Field HTS-SMES Based on Homogenized Distribution of Magnetically-Mechanically Influenced Critical Current

Higashikawa

Nakamura

Sugano

et al. 2008

IEEE Trans. Appl. Supercond.

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Generally speaking for a HTS coil, perpendicular magnetic field to conductor's broad surface should be suppressed as small as possible in relation to the magnetic anisotropy. This is a reason why toroidal coil with relatively many elementary coils is expected for HTS-SMES. On the other hand, from the point of view of the homogenization of critical current distribution in the coil, perpendicular field and parallel field should be balanced corresponding to the ratio of the magnetic anisotropy. This means that a certain level of the perpendicular field is effective to reduce local heat generation in the coil. Furthermore, this concept is especially reasonable for a high-field coil with usual winding method (flat-wise winding) because the perpendicular field does not induce hoop stress which decreases the critical current. In this paper, we show these findings through an optimal design of a MOCVD-YBCO toroidal coil for 2 GJ class SMES taking account of magnetically and mechanically influenced characteristics. Index Terms-Hoop stress, mechanical strain, optimal design, SMES, YBCO coated conductor. I. INTRODUCTION I N JAPAN, the applicability of YBCO coated conductor to SMES has been explored under a national project by NEDO since FY2004. As a part of the project, we carried out a conceptual design of a high-field (over 10 T) YBCO coil at 20 K, and suggested that YBCO coated conductor could realize a very compact SMES magnet compared with a conventional one using Nb-Ti conductor [1]. Furthermore, it was also indicated that such a high-field coil could be realized not only by good transport characteristics of the YBCO material against magnetic field but also by high mechanical strength of Hastelloy substrate against hoop stress.

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Analysis of Discharging Characteristics in a Bi-2223/Ag Coil for SMES With Consideration of Cooling Capacity of a Cryocooler

Cited by 6 publications

References 14 publications

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

Longitudinal Inhomogeneity of DC Current Transport Properties in Gd-system HTS Tapes

Performance Improvement of YBCO Coil for High-Field HTS-SMES Based on Homogenized Distribution of Magnetically-Mechanically Influenced Critical Current

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