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Journal Articles

Development of 10kA Bi2212 conductor for fusion application

Isono, Takaaki; Nunoya, Yoshihiko; Ando, Toshinari*; Okuno, Kiyoshi; Ono, Michitaka*; Ozaki, Akira*; Koizumi, Tsutomu*; Otani, Nozomu*; Hasegawa, Takayo*

IEEE Transactions on Applied Superconductivity, 13(2), p.1512 - 1515, 2003/06

 Times Cited Count:21 Percentile:67.87(Engineering, Electrical & Electronic)

Japan Atomic Energy Research Institute has started development work on a large current conductor using high Tc superconductor (HTS) aiming at a fusion power reactor after the International Thermonuclear Experimental Reactor (ITER). HTS has a capability to produce a magnetic field of higher than 16 T, which is required in such a fusion power reactor. A trial fabrication of a 10-kA 12-T conductor was started using round Ag-alloy sheathed Bi-2212 strands, which has best performance at 4.2K, 16T at present. The conductor has about 34-mm diameter, and is composed of 729 HTS strands. Operating temperature is designed at not only 4 K but also 20K. The conductor sample is indirectly cooled and is solder-coated on the surface to use specific heat of the lead as much as possible, which at 20 K is almost comparable with specific heat of SHe at 4.5K, 0.6MPa. From the tests of the conductor, the fabrication of large HTS conductor and 10kA operation at 12 T and about 12.5 K were successfully performed and the possibility of HTS to use fusion application was demonstrated.

Journal Articles

Evaluation method of critical current and current sharing temperature for large-current Cable-in-Conduit conductors

Nunoya, Yoshihiko; Isono, Takaaki; Sugimoto, Makoto; Takahashi, Yoshikazu; Nishijima, Gen*; Matsui, Kunihiro; Koizumi, Norikiyo; Ando, Toshinari*; Okuno, Kiyoshi

IEEE Transactions on Applied Superconductivity, 13(2), p.1404 - 1407, 2003/06

 Times Cited Count:10 Percentile:49.54(Engineering, Electrical & Electronic)

Analysis of critical current ($$I_c$$) and current sharing temperature ($$T_{cs}$$) was performed to the ITER Center Solenoid (ITER-CS) Model Coil Insert. Voltage behavior related to normal state transition of the conductor during $$I_c$$ or $$T_{cs}$$ measurement has not been well understood especially in case of such a large cable with more than one thousand strands as this coil. From the detailed analysis of the voltage behavior of the coil, it is found that the average of electric field in the strand-longitudinal direction over the conductor cross section is equal to the average field of one strand along the conductor length, whose integral was measured by the voltage taps during the coil test. It is because twist pitch of the cable is less than the range of longitudinal field variation in this case. This evaluation method can estimate voltage behavior and predict $$I_c$$ and $$T_{cs}$$ values, which are important parameters for the design of a large conductor coil, based on the property of strands composing the conductor.

Journal Articles

Monte Carlo simulation of strand position in CIC Conductor

Aoki, Kosuke*; Izumi, Yoshinobu*; Nishijima, Shigehiro*; Okuno, Kiyoshi; Koizumi, Norikiyo

IEEE Transactions on Applied Superconductivity, 13(2), p.1744 - 1747, 2003/06

 Times Cited Count:1 Percentile:12.42(Engineering, Electrical & Electronic)

The strand position in CIC conductor consisting of 1,152(3$$times$$4$$times$$4$$times$$4$$times$$6) strands was analytically evaluated using Monte Carlo method. During the conductor fabrication, the conduit was compressed with the cable to fix the size and shape from one end. This makes the strands to be stretched along the axis. In the calculation, such manufacturing process was simulated. In addition, the contact energy between strands and the strain energy in the strands are considered. The calculation results show that the strands are moved by compressing the conduit. By this calculation, not only strand positions but also the distribution of contact stress between strands could be evaluated.

Journal Articles

Design of toroidal field coil for the JT-60 superconducting tokamak

Tsuchiya, Katsuhiko; Kizu, Kaname; Miura, Yushi; Ando, Toshinari*; Isono, Takaaki; Matsui, Kunihiro; Koizumi, Norikiyo; Matsukawa, Makoto; Sakasai, Akira; Ishida, Shinichi

IEEE Transactions on Applied Superconductivity, 13(2), p.1480 - 1483, 2003/06

 Times Cited Count:6 Percentile:37.63(Engineering, Electrical & Electronic)

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