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

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

543

Lastpage

546

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233762

Filename

233762