Title :
Qualification Test Results of the KSTAR Superconducting Coils From the Construction to the Commissioning Steps
Author :
Park, K.R. ; Chu, Yong ; Yonekawa, Hirofumi ; Baang, E.N. ; Kim, Y.O. ; Lee, Hyun Jung ; Park, Y.M. ; Lee, Y.J. ; Chang, H.S. ; Lee, D.K. ; Choi, J.H. ; Park, S.H. ; Hahn, S.H. ; Kim, K.H. ; Hwang, I.S. ; Park, M.K. ; Cho, K.W. ; Kim, Y.S. ; Oh, Y.K. ; Ba
Author_Institution :
Nat. Fusion Res. Inst., Daejeon, South Korea
fDate :
6/1/2009 12:00:00 AM
Abstract :
To achieve the first plasma of the Korea superconducting tokamak advanced research (KSTAR), the KSTAR superconducting coils were tested in advance. As they should operate in excessively low temperature of 4.5 K and high magnetic field environment of 7.5 T, it is crucial to monitor the cryogenic and the structural behaviors of KSTAR device during the commissioning period including a cool-down. The temperatures of the KSTAR toroidal field (TF) coil and the poloidal field (PF) coils were measured during the entire operating period. The mechanical stresses on the TF and PF structures were continuously monitored to check if they go beyond the limiting value calculated through the simulation. The alignment of the KSTAR device was checked by using displacement sensors. The TF coils were successfully supplied with 15 kA DC current for 8 hours, and the maximum 5 kA/s current variation of the PF coils were tested. For the main experiment, the interlock test of the quench detection system for the KSTAR coils was carried out at reduced currents of 1 kA. From these results the quench protection circuit, and the current-flow of the KSTAR superconducting coils proved to be well performed for the first plasma operation.
Keywords :
Tokamak devices; cryogenics; internal stresses; superconducting coils; superconducting magnets; KSTAR superconducting coils; Korea superconducting tokamak advanced research; cryogenics; current 15 kA; displacement sensors; magnetic field; magnetic flux density 7.5 T; mechanical stress; plasma operation; poloidal field coil; temperature 4.5 K; time 8 hour; toroidal field coil; Circuit testing; Cryogenics; Magnetic field measurement; Monitoring; Plasma devices; Plasma temperature; Qualifications; Superconducting coils; Tokamaks; Toroidal magnetic fields; KSATR; PF coil; TF coil; quench;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2018788