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- W3142451877 abstract "A novel divertor biasing using four biasing plates that are arranged toroidally every 90◦ on the upper divertor plate is applied to low-density plasmas of the QUEST spherical tokamak. When some of these plates are biased in-phase by applying a sawtooth waveform voltage of 85-V amplitude and 50-Hz repetition, up to approximately 35% reduction of the particle flux to the divertor is observed during positive biasing. The input power for the flux reduction is approximately 0.2 kW for low-density tokamak plasmas produced by ∼130-kW electron cyclotron wave injection. Additionally, the signal of a plate probe placed in the low-field side of the mid-plane of the vacuum vessel indicates enhanced losses of fast electrons during positive biasing. The enhanced loss is attributed to small resonant magnetic perturbations produced by the bias-driven currents in the scrape-off layer. This novel divertor biasing is expected to provide a new experimental tool for studying divertor heat load control and fast electron confinement in a tokamak device." @default.
- W3142451877 created "2021-04-13" @default.
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- W3142451877 date "2021-03-05" @default.
- W3142451877 modified "2023-10-02" @default.
- W3142451877 title "Effects of Toroidally Distributed Divertor Biasing on Scrape-Off-Layer Plasma in the QUEST Spherical Tokamak" @default.
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- W3142451877 doi "https://doi.org/10.1585/pfr.16.2402024" @default.
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