2011
DOI: 10.1109/tasc.2010.2103546
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Analysis of the Reversal Flow Phenomenon of Supercritical Helium Due to AC Losses in the KSTAR PF Magnets at the Low Current

Abstract: Superconducting magnets of the Korea Superconducting Tokamak Advanced Research (KSTAR) are cooled by supercritical helium with 4.5 K, which was supplied and recovered by the 9 kW of the Helium Refrigerator System (HRS). While current is being charged, the supercritical helium expands to both side of the helium inlet and the outlet of the magnets due to the generated AC losses. To maintain the pressure gradient, both the supply and the return pressures of the HRS are increased at the same time and the different… Show more

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Cited by 6 publications
(3 citation statements)
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“…These phenomena are presented by the KSTAR PF1 to PF4 magnet winding scheme because the inlet and outlet of cooling channels are located at high field region. The third peak is smaller than the second peak because the generated heat is mitigated by transferring heat to other parts of magnet cold mass during helium traveling along the cooling channel [6]. The peak temperatures installed at the magnet termination (CH1, CH6) of the PF1 upper and lower coils are distinctly less than other outlet channels.…”
Section: A Normal Operationmentioning
confidence: 95%
See 1 more Smart Citation
“…These phenomena are presented by the KSTAR PF1 to PF4 magnet winding scheme because the inlet and outlet of cooling channels are located at high field region. The third peak is smaller than the second peak because the generated heat is mitigated by transferring heat to other parts of magnet cold mass during helium traveling along the cooling channel [6]. The peak temperatures installed at the magnet termination (CH1, CH6) of the PF1 upper and lower coils are distinctly less than other outlet channels.…”
Section: A Normal Operationmentioning
confidence: 95%
“…The flow rate rapidly decreased two times. The flow reduction is proportional to the generated AC losses in the magnet [5], [6]. The first peak is originated from the initial charge of the magnet.…”
Section: A Normal Operationmentioning
confidence: 99%
“…22(b). And the operation point of the cryogenic circulator moved into the unstable zone and transiently (Lee, H.J. et al, 2011;park, Y.M.…”
Section: Designed Operation Extended Operationmentioning
confidence: 99%