Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Hydraulic Behaviors of KSTAR PF Coils in Operation

  • Park, S.H. (KSTAR research center, National Fusion Research Institute) ;
  • Chu, Y. (KSTAR research center, National Fusion Research Institute) ;
  • Kim, Y.O. (KSTAR research center, National Fusion Research Institute) ;
  • Yonekawa, H. (KSTAR research center, National Fusion Research Institute) ;
  • Chang, Y.B. (KSTAR research center, National Fusion Research Institute) ;
  • Woo, I.S. (KSTAR research center, National Fusion Research Institute) ;
  • Lee, H.J. (KSTAR research center, National Fusion Research Institute) ;
  • Park, K.R. (KSTAR research center, National Fusion Research Institute)
  • Received : 2012.04.04
  • Accepted : 2012.05.07
  • Published : 2012.05.31
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Abstract

The superconducting coil system is one of the most important components in Korea Superconducting Tokamak Advanced Research (KSTAR), which has been operated since 2008. $Nb_3Sn$ and NbTi superconductors are being used for cable-in-conduit conductors (CICCs) of the KSTAR toroidal field (TF) and poloidal field (PF) coils. The CICCs are cooled by forced-flow supercritical helium about 4.5 K. The temperature, pressure and mass flow rate of the supercritical helium in the CICCs are interacting with each other during the operation of the coils. The complicate behaviors of the supercritical helium have an effect on the operation and the efficiency of the helium refrigeration system (HRS) by means of, for instance, pressure drop. The hydraulic characteristics of the supercritical helium have been monitored while the TF coils have stably achieved the full current of 35 kA. In other hands, the PF coils have been operated with various pulsed or bipolar mode, so the drastic changes happen in view of hydraulics. The heat load including AC loss on the coils has been analyzed according to the measurement. These activities are important to estimate the temperature margin in various PF operation conditions. In this paper, the latest hydraulic behaviors of PF coils during KSTAR operation are presented.

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References

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