Journal of the Korean Vacuum Society (한국진공학회지)

The Korean Vacuum Society (한국진공학회)
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Construction and Assembly of KSTAR Current Leads and the Helium Control System

KSTAR 전류인입선 및 헬륨냉매 제어시스템 제작 및 설치

  • Song, N.H. (National Fusion Research Institute(NFRI)) ;
  • Woo, I.S. (National Fusion Research Institute(NFRI)) ;
  • Lee, Y.J. (National Fusion Research Institute(NFRI)) ;
  • Kwag, S.W. (National Fusion Research Institute(NFRI)) ;
  • Bang, E.N. (National Fusion Research Institute(NFRI)) ;
  • Lee, K.S. (National Fusion Research Institute(NFRI)) ;
  • Kim, J.S. (National Fusion Research Institute(NFRI)) ;
  • Jang, Y.B. (National Fusion Research Institute(NFRI)) ;
  • Park, H.T. (National Fusion Research Institute(NFRI)) ;
  • Hong, J.S. (National Fusion Research Institute(NFRI)) ;
  • Park, Y.M. (National Fusion Research Institute(NFRI)) ;
  • Kim, Y.S. (National Fusion Research Institute(NFRI)) ;
  • Choi, C.H. (National Fusion Research Institute(NFRI))
  • Published : 2007.09.30
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Abstract

KSTAR (Korea Superconducting Tokamak Advanced Research) current lead system (CLS) has a role to interconnect magnet power supply (MPS) in room temperature (300 K) and superconducting (SC) bus-line, electrically. For the first plasma experiments, it should be assembled 4 current leads (CL) on toroidal field (TF) current lead box (CLB) and 14 leads on poloidal field (PF) CLB. Two current leads, with the design currents 17.5 kA, and SC bus-lines are connected in parallel to supply 35 kA DC currents on TF magnet. Whereas, it could supply $20\;{\sim}\;26\;kA$ to each pairs of PF magnets during more than 350 s. At the cold terminals of the leads, there are joined SC bus-lines and it was constructed helium coolant control system, aside from main tokamak system, to protect heat flux through current leads and enhanced Joule heat due to supplied currents. Throughout the establishment processes, it was tested the high vacuum pumping, helium leak of the helium lines and hardwares mounted between the helium lines, flow controls for CL, and liquid nitrogen cool-down of possible parts (current leads, CL helium lines, and thermal shield helium lines for CLB), for the accomplishment of the required performances.

KSTAR (Korea Superconducting Tokamak Advanced Research) 전류인입선(CL; Current Lead)은 4.5 K의 저온에서 운전되는 초전도 버스라인과 300 K의 실온에서 운전되는 MPS (Magnet Power Supply)를 전기적으로 연결하는 장치이다. 초기 플라즈마 발생시험을 위하여 TF (Toroidal Field) 및 PF (Poloidal Field) 리드박스에 전류인입선이 설치된다. TF 자석용 CL은 17.5 kA급 4 개의 CL에 최대 35 kA의 DC 전류가 인가되며, PF 자석용은 13 kA급 14 개의 CL에 350초간 $20\;{\sim}\;26\;kA$의 펄스 전류가 인가된다. 각각의 전류인입선은 TF 및 PF 자석에 전류를 인가하기 위한 버스라인이 연결되어 있으며, 전류인입선을 통해 초전도 버스라인으로 전달되는 전도열 및 전류인가시 발생되는 주울(Joule) 열을 차단하기 위한 헬륨냉매 제어시스템이 KSTAR 주장치와는 별도로 설치되어 있다. 리드박스 내 외부의 배관 및 제어시스템 설치완료 후 고진공 배기, 헬륨 누설검사, 전류인입선 유량 검사 및 액체질소 냉각시험을 실시하여 장치의 성능검증을 완료하였다.

Keywords

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Cited by

  1. Construction and Commissioning Results of the KSTAR Current Lead System vol.20, pp.3, 2010, https://doi.org/10.1109/TASC.2010.2040727