Title :
Excitation experiments of module coil (TOKI-MC) as an R&D program for Large Helical Device
Author :
Sakamoto, M. ; Mito, T. ; Takahata, K. ; Nishimura, A. ; Yanagi, N. ; Yamada, S. ; Yamamoto, J. ; Motojima, O. ; Minato, T. ; Ichihara, T. ; Hasegawa, M.
Author_Institution :
Nat. Inst. for Fusion Sci., Nagoya, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
Excitation experiments for one of the R&D coils called TOKI-MC have been carried out to simulate the condition of excitation of helical coils for the Large Helical Device (LHD). TOKI-MC is a pool-cooled twisted solenoid coil with aluminum stabilized superconductors that were obliquely wound around an elliptical bobbin. In all nominal current excitations, quenches were initiated around 17 kA while the design current was 20 kA. There was no training effect. Signals of acoustic emission (AE) sensors indicated that the quenches were triggered by mechanical perturbations. It was found that the conductor of TOKI-MC moved freely without restriction due to the electromagnetic force, and that the winding moved reversibly.<>
Keywords :
fusion reactor theory and design; quenching (thermal); superconducting magnets; 17 kA; 20 kA; Al stabilised superconductors; LHD; Large Helical Device; R&D coils; TOKI-MC; acoustic emission sensor signal; electromagnetic force; elliptical bobbin; fusion reactor; helical coil excitation simulation; mechanical perturbations; nominal current excitations; pool-cooled twisted solenoid coil; quenching; training effect; Acoustic emission; Acoustic sensors; Aluminum; Conductors; Electromagnetic forces; Mechanical sensors; Solenoids; Superconducting coils; Superconductivity; Wounds;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
