Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Controls on KSTAR Superconducting Poloidal Field (PF) Magnets

  • Hahn, Sang-Hee (National Fusion Research Institute (NFRI)) ;
  • Kim, K.H. (National Fusion Research Institute (NFRI)) ;
  • Choi, J.H. (National Fusion Research Institute (NFRI)) ;
  • Ahn, H.S. (POSCON Cooperation R&D Center, 101 Korea Tech. Complex Bldg., Korea Univ.) ;
  • Lee, D.K. (National Fusion Research Institute (NFRI)) ;
  • Park, K.R. (National Fusion Research Institute (NFRI)) ;
  • Eidietis, N.W. (General Atomics) ;
  • Leuer, J.A. (General Atomics) ;
  • Walker, M.L. (General Atomics) ;
  • Yang, H.L. (National Fusion Research Institute (NFRI)) ;
  • Kim, W.C. (National Fusion Research Institute (NFRI)) ;
  • Oh, Y.K. (National Fusion Research Institute (NFRI))
  • Published : 2008.11.30
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Abstract

As a part of the plasma control system (PCS) for the first plasma campaign of KSTAR, seven sets of fast feedback control loop for the superconducting poloidal field magnet power supply (PF MPS) have been implemented. A special real-time digital communication interface has been developed for the simultaneous exchanges of the current/voltage data from the 7 sets of 12-thyristor power supplies in a 200 microsecond control cycle. Preliminary power supply tests have been performed before actual cooldown of the device. A $29mH/50m{\Omega}$ solenoid dummy has been fabricated for a series of single power supply tests. Connectivity and response speed of the plasma control system have been verified. By changing hardware cabling, this load was also used to estimate mutual inductance coupling effects of two geometrically adjacent solenoid coils on each power supply. After the cooldown was complete, each pair of the up/down symmetric PF coils has been serially connected and tested as part of the device commissioning process. Bipolar operation and longer pulse attempts have been investigated. The responses of the coils and power supplies corresponding to the plasma magnetic controls in plasma discharges are also analyzed for the future upgrades.

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References

  1. Lee, G.S. et al, "Design and Construction of the KSTAR Tokamak", Nuclear Fusion, vol. 41, pp. 1515, 2001 https://doi.org/10.1088/0029-5515/41/10/318
  2. Hahn, S.H., et al, "Plasma Control System for "Day-One" Operation of KSTAR Tokamak", Fusion Engineering and Design (submitted), 2008
  3. Choi, J.H., et al, "Overview of Superconducting Magnet Power Supply System for the KSTAR 1st Plasma Experiment," Transactions of the Korean Nuclear Society (accepted), 2008 https://doi.org/10.5516/NET.2008.40.6.459
  4. For specifications, see GE Fanuc homepage (http://www.gefanuc.com)