TY - JOUR
T1 - 8.56-GHz quasi-optical launcher system with incident-mode selectivity on the QUEST spherical tokamak
AU - Idei, H.
AU - Sakaguchi, M.
AU - Mishra, K.
AU - Onchi, T.
AU - Ikezoe, R.
AU - Watanabe, O.
AU - Tanaka, Y.
AU - Saito, T.
AU - Ido, T.
AU - Hanada, K.
N1 - Funding Information:
This work was performed under the auspices and support of the NIFS Collaboration Research Program under Grants NIFS13KUTR085 .
Publisher Copyright:
© 2023
PY - 2023/4
Y1 - 2023/4
N2 - An 8.56-GHz quasi-optical launcher system with incident-mode selectivity was developed for non-inductive electron cyclotron (EC) plasma ramp-up and long-pulse sustainment, and effective bulk-electron heating on the Q-shu University experiment with steady-state spherical tokamak (QUEST). A novel polarization-selective system was proposed to conduct fundamental and second harmonic EC heating and current drive experiments with ordinary and extra-ordinary mode waves, respectively. Selectivity of the incident modes or polarizations was confirmed using the whole developed system at a low power level. A large-sized mirror launcher was developed to inject the beam whose size was as small as possible near the QUEST major radius. The designed mirror performance was checked using a three-dimensional electromagnetic-wave simulator and a low-power test. Ultimately, 0.15-m sized beams for both the two polarizations were successfully attained near the QUEST major radius, even in low-frequency applications with long propagation.
AB - An 8.56-GHz quasi-optical launcher system with incident-mode selectivity was developed for non-inductive electron cyclotron (EC) plasma ramp-up and long-pulse sustainment, and effective bulk-electron heating on the Q-shu University experiment with steady-state spherical tokamak (QUEST). A novel polarization-selective system was proposed to conduct fundamental and second harmonic EC heating and current drive experiments with ordinary and extra-ordinary mode waves, respectively. Selectivity of the incident modes or polarizations was confirmed using the whole developed system at a low power level. A large-sized mirror launcher was developed to inject the beam whose size was as small as possible near the QUEST major radius. The designed mirror performance was checked using a three-dimensional electromagnetic-wave simulator and a low-power test. Ultimately, 0.15-m sized beams for both the two polarizations were successfully attained near the QUEST major radius, even in low-frequency applications with long propagation.
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U2 - 10.1016/j.fusengdes.2023.113479
DO - 10.1016/j.fusengdes.2023.113479
M3 - Article
AN - SCOPUS:85147246656
SN - 0920-3796
VL - 189
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
M1 - 113479
ER -