TY - JOUR
T1 - A versatile power supply system for the central solenoid of the QUEST spherical tokamak
AU - Zhang, Yifan
AU - Onchi, Takumi
AU - Nakamura, Kazuo
AU - Otsuka, Yuya
AU - Koide, Yuji
AU - Yue, Qilin
AU - Nagata, Takahiro
AU - Kawasaki, Shoji
AU - Kuroda, Kengoh
AU - Hasegawa, Makoto
AU - Ikezoe, Ryuya
AU - Ido, Takeshi
AU - Hanada, Kazuaki
AU - Idei, Hiroshi
N1 - Publisher Copyright:
© 2023
PY - 2023/6
Y1 - 2023/6
N2 - Here, a versatile power supply system, consisting of two current sources, insulated-gate bipolar transistor stacks, and a capacitor bank, is proposed for application in various operations of the QUEST spherical tokamak. The central solenoid coil in this system can carrying a maximum current and voltage of ±8 kA and ±375 V, respectively. In plasma start-up experiments based on ohmic heating through double flux swing, a plasma current of over 100 kA is stably obtained. Moreover, the feedback control of the thyristor power supply is utilized to control the plasma current, plasma shape, and position. The oscillating central-solenoid current applies a bipolar loop voltage at constant time intervals, and the capacitor bank discharge facilitates a co-axial helicity injection as well as amplifies the toroidal current.
AB - Here, a versatile power supply system, consisting of two current sources, insulated-gate bipolar transistor stacks, and a capacitor bank, is proposed for application in various operations of the QUEST spherical tokamak. The central solenoid coil in this system can carrying a maximum current and voltage of ±8 kA and ±375 V, respectively. In plasma start-up experiments based on ohmic heating through double flux swing, a plasma current of over 100 kA is stably obtained. Moreover, the feedback control of the thyristor power supply is utilized to control the plasma current, plasma shape, and position. The oscillating central-solenoid current applies a bipolar loop voltage at constant time intervals, and the capacitor bank discharge facilitates a co-axial helicity injection as well as amplifies the toroidal current.
KW - IGBT
KW - Ohmic heating
KW - bipolar current source
KW - eddy current
KW - null point
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U2 - 10.1016/j.fusengdes.2023.113648
DO - 10.1016/j.fusengdes.2023.113648
M3 - Article
AN - SCOPUS:85149843703
SN - 0920-3796
VL - 191
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
M1 - 113648
ER -