TY - JOUR
T1 - Performance improvement of YBCO coil for high-field HTS-SMES based on homogenized distribution of magnetically-mechanically influenced critical current
AU - Higashikawa, Kohei
AU - Nakamura, Taketsune
AU - Sugano, Michinaka
AU - Shikimachi, Koji
AU - Hirano, Naoki
AU - Nagaya, Shigeo
N1 - Funding Information:
Manuscript received August 24, 2007. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), under the Research and Development of Superconducting Magnetic Energy Storage System sponsored by Agency of Natural Resources and Energy, Ministry of Economy, Trade and Industry (METI). In addition, YBCO coated conductors used in this work were produced by Chubu Electric Power Co., supported by NEDO through ISTEC, as the Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. The design method for HTS-SMES coil was developed with the support of Grant-in-Aid for JSPS Fellows (182788) by the Ministry of Education, Science, Sports and Culture in Japan.
PY - 2008/6
Y1 - 2008/6
N2 - 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 J - E characteristics.
AB - 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 J - E characteristics.
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U2 - 10.1109/TASC.2008.921890
DO - 10.1109/TASC.2008.921890
M3 - Article
AN - SCOPUS:45149093498
SN - 1051-8223
VL - 18
SP - 758
EP - 761
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
M1 - 4493373
ER -