Title :
Persistent current HTS magnet cooled by cryocooler (4) - persistent current switch characteristics
Author :
Tosaka, Taizo ; Tasaki, Kenji ; Marukawa, Kotaro ; Kuriyama, Toru ; Nakao, Hiroyuki ; Yamaji, Mutsuhiko ; Kuwano, Katsuyuki ; Igarashi, Motohiro ; Nemoto, Kaoru ; Terai, Motoaki
Author_Institution :
Power & Ind. Syst. R&D Center, Toshiba Corp., Yokohama, Japan
fDate :
6/1/2005 12:00:00 AM
Abstract :
We developed a persistent current high temperature superconducting (HTS) magnet for Maglev train. The HTS magnet mainly consists of an HTS coil, a persistent current switch (PCS), a GM type two-stage pulse tube cryocooler. A PCS is one of the most important components to maintain persistent current operation. A YBCO thin film was adopted for a PCS conductor because it has a high resistivity over a critical temperature and a high critical current density at lower temperatures. Persistent current mode operation tests were successfully carried out with the PCS. The current decay rate at the rated current operation of 532 A was 0.44%/day which was investigated by measuring the magnetic field at the center of the coil.
Keywords :
barium compounds; cryogenics; high-temperature superconductors; magnetic levitation; permanent magnets; persistent currents; superconducting coils; superconducting magnets; superconducting thin films; yttrium compounds; GM type two-stage pulse tube cryocooler; YBCO thin film; YBa2Cu3O7; maglev train; persistent current HTS magnet; persistent current high temperature superconducting magnet; persistent current switch characteristics; High temperature superconductors; Magnetic field measurement; Magnetic levitation; Magnetic switching; Persistent currents; Personal communication networks; Superconducting coils; Superconducting magnets; Switches; Yttrium barium copper oxide; HTS magnets; Maglev train; PCS; YBCO thin films; persistent current mode;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.849634
