Title :
Stable long-term operation of superconducting current-feeder system for the LHD
Author :
Yamada, Shuichi ; Mito, Toshiyuki ; Maekawa, Ryuji ; Chikaraishi, Hirotaka ; Moriuchi, Sadatomo ; Uede, Toshio ; Hiue, Hisaaki ; Yasukawa, Yasuo ; Itoh, Ikuo ; Satow, Takashi ; Motojima, Osamu
Author_Institution :
Nat. Inst. for Fusion Sci., Gifu, Japan
fDate :
3/1/2002 12:00:00 AM
Abstract :
A superconducting (SC) current-feeder system is used as the current transmission lines for the experimental fusion device, LRD. It consists of nine flexible SC bus lines with total length of 497 m, and nine pairs of gas-cooled current leads. To avoid the propagation of the ice on the leads, the temperature of the terminals had been kept in the range between 5 and 20 degrees C by the heaters. The measured voltage drops of all leads were less than 20 mV. The liquid helium levels of the leads and the sub-cooler tank will equalize by the siphon method. The total time of the coil excitations exceeds 3000 hours. We have demonstrated successfully that the SC current-feeder system was stable and easy to handle, and is useful for the SC experimental fusion device.
Keywords :
fusion reactor design; stellarators; superconducting cables; superconducting coils; Large Helical Device; automatic manipulation; coil excitations; current transmission lines; experimental fusion device; flexible bus lines; gas-cooled current leads; helical coils; heliotron; low voltage drops; poloidal coils; stable long-term operation; superconducting current-feeder system; Helium; Ice; Large-scale systems; Plasma temperature; Power supplies; Space heating; Superconducting coils; Superconducting transmission lines; Temperature distribution; Voltage measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2002.1018647
