Title :
Testing of the world´s largest HTS experimental magnet with Ag-sheathed Bi-2223 tapes for Si single crystal growth applications
Author :
Tasaki, K. ; Ono, M. ; Yazawa, T. ; Sumiyoshi, Y. ; Nomura, S. ; Kuriyama, Toshihide ; Dozono, Y. ; Maeda, H. ; Hikata, T. ; Hayashi, K. ; Takei, H. ; Sato, K. ; Kimura, Mizue ; Masui, T.
Author_Institution :
Toshiba Corp., Yokohama, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
Funded by the Ministry of International Trade and Industry (MITI) of Japan, a project to develop a cryocooler-cooled high-temperature superconducting (HTS) magnet for Si single crystal growth applications began in October 1997 on the basis of collaboration between Toshiba Corp., Sumitomo Electric Industries Ltd, and Shin-Etsu Handotai Co., Ltd. So far, we have finished a design of the HTS magnet and basic tests using a model coil. The target magnet is composed of 36 single pancake coils using Ag-sheathed Bi2223 tapes and total length of the HTS tapes is approximately 80 km. Stored electromagnetic energy of the magnet will amount to 1 MJ at rated current operations. The magnet is to be cooled to below 20 K by a GM (Gifford-McMahon) cryocooler. Before fabricating the target magnet, we tested a model coil composed of 4 single pancake coils which were the same size as those of the target magnet, in order to investigate basic characteristics of the HTS coils. We performed a 290 A continuous current flowing operation using the model coil and reached 50 kJ of electromagnetic energy storage
Keywords :
bismuth compounds; calcium compounds; crystal growth from melt; elemental semiconductors; high-temperature superconductors; silicon; silver; strontium compounds; superconducting coils; superconducting device testing; superconducting magnets; superconducting tapes; 1 MJ; 290 A; 50 kJ; 80 km; Ag-sheathed Bi-2223 tapes; Ag-sheathed Bi2223 tapes; Bi2Sr2Ca2Cu3O-Ag; Gifford-McMahon cryocooler; HTS magnet; Japan; Ministry of International Trade and Industry; Shin-Etsu Handotai; Si; Si single crystal growth; Sumitomo Electric Industries; Toshiba; continuous current flowing operation; cryocooler-cooled HTS magnet; electromagnetic energy storage; model coil; single pancake coils; stored electromagnetic energy; Conductors; High temperature superconductors; International trade; Magnetic flux; Niobium compounds; Silicon; Superconducting coils; Superconducting magnetic energy storage; Superconducting magnets; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
