Speaker
Young-Ju Lee
(Vacuum & cryogenic engineering team)
Description
KSTAR project has required the new helium distribution box named upgraded distribution box (DBU) for the operation of the cryogenic components such as in-vessel cryo-pump (CPI), super-sonic molecular beam injector (SMBI), and hydrogen pellet injection system (PIS). Two CPIs are inserted into the tokamak vacuum vessel and these components shall be operated at 90 K for the liquid nitrogen thermal shields and 4.5 K for the hydrogen cryo-panel. One hydrogen PIS shall be mounted to the tokamak for the 2016 KSTAR campaign. Liquid nitrogen shall be supplied to the one SMBI. For the operation of above mentioned 3 kinds of cryogenic components, a helium refrigerator, which had been used for the R&D in the KSTAR facility construction phase (2002 ~ 2013), was moved and inserted into the KSTAR 9 kW helium facility room. The cooling capacity of the refrigerator at 4.5 K is 1 kW and it was manufactured from the Linde Kryotechnik before 2002.
From the beginning of 2015, design and fabrication of the DBU was started. It shall control the liquid nitrogen for the SMBI and CPI thermal shields whereas liquid helium for the CPI cryo-panel and PIS. To minimize the temperature of the liquid nitrogen to be supplied to SMBI and CPI, a thermal damper tank was inserted into the distribution box. Nitrogen return gases are to be warmed up to room temperature at the heater in the distribution box. A 1000 liters of liquid helium vessel is located nearby the PIS to supply cold gas helium (~ 5 K). Because the CPI cryo-panel requires regeneration up to 90 K, complex regeneration and re-cool down scenario was developed and applied to the DBU. Including operational results, details of the DBU progresses will be reported in this paper.
Co-authors
Chul-Hee Lee
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Dong-Seong Park
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Hee-Jae Ahn
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Jae-Joon Joo
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Kyung-Mo Moon
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Nak-hyung Song
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Nam-Won Kim
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Sang-Woo Kwag
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Yaung-Soo Kim
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Yong-Bok Chang
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
Young-Ju Lee
(Vacuum & cryogenic engineering team, National Fusion Research Institute, Daejeon, South Korea)
