TY - JOUR
T1 - Overview of recent progress on steady state operation of all-metal plasma facing wall device QUEST
AU - Hanada, K.
AU - Yoshida, N.
AU - Hasegawa, M.
AU - Oya, M.
AU - Oya, Y.
AU - Takagi, I.
AU - Hatayama, A.
AU - Shikama, T.
AU - Idei, H.
AU - Nagashima, Y.
AU - Ikezoe, R.
AU - Onchi, T.
AU - Kuroda, K.
AU - Kawasaki, S.
AU - Higashijima, A.
AU - Nagata, T.
AU - Shimabukuro, S.
AU - Nakamura, K.
AU - Murakami, S.
AU - Takase, Y.
AU - Gao, X.
AU - Liu, H.
AU - Qian, J.
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Japan Society for the Promotion of Science Fellows (KAKENHI grant number JP16H02441 , JP19H05526 , 21H04456 ) and the NIFS Collaboration Research Program (NIFS05KUTRO14, NIFS13KUTR093, NIFS13KUTR085, and NIFS14KUTR103). This work was also supported in part by the Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University.
Publisher Copyright:
© 2021 The Authors
PY - 2021/6
Y1 - 2021/6
N2 - QUEST (Q-shu university experiment with steady state spherical tokamak) is a midsize spherical tokamak capable of steady-state operation, comprising all-metal plasma-facing walls and a hot wall (HW) to address issues pertaining to fuel particle balance. The HW was installed summer 2014. Quantitative analysis pertaining to the HW at 373 K is carried out, and clarify the quantitative impact of shot history that obviously appears in wall stored hydrogen just before the discharge at the wall temperature. The model indicates the plasma-induced deposition layer play an essential role in fuel particle balance. A clear temperature dependence of fuel recycling was observed using outgassing just after plasma termination and played an essential role in regulation of particle balance. Consequently, long duration discharges lasting more than 1 h has been obtained at wall temperature, TW < 423 K in the range of 40–60 kW of RF power and, similarly, a 6 h discharge could be achieved at TW = 473 K using 20 kW of injected RF power.
AB - QUEST (Q-shu university experiment with steady state spherical tokamak) is a midsize spherical tokamak capable of steady-state operation, comprising all-metal plasma-facing walls and a hot wall (HW) to address issues pertaining to fuel particle balance. The HW was installed summer 2014. Quantitative analysis pertaining to the HW at 373 K is carried out, and clarify the quantitative impact of shot history that obviously appears in wall stored hydrogen just before the discharge at the wall temperature. The model indicates the plasma-induced deposition layer play an essential role in fuel particle balance. A clear temperature dependence of fuel recycling was observed using outgassing just after plasma termination and played an essential role in regulation of particle balance. Consequently, long duration discharges lasting more than 1 h has been obtained at wall temperature, TW < 423 K in the range of 40–60 kW of RF power and, similarly, a 6 h discharge could be achieved at TW = 473 K using 20 kW of injected RF power.
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U2 - 10.1016/j.nme.2021.101013
DO - 10.1016/j.nme.2021.101013
M3 - Article
AN - SCOPUS:85107091408
SN - 2352-1791
VL - 27
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
M1 - 101013
ER -