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RF generated voltage on the Faraday screen of an ICRF antenna and its effect on the Phaedrus-T edge plasma

T. Tanaka, R. Majeski, D.A. Diebold, N. Hershkowitz1996年被引用 15Nuclear FusionIF 3出版社

Work done on the Phaedrus-T tokamak is summarized regarding RF voltages induced on the sides of slotted side Faraday screens (FSs). Direct in-air measurements show voltages induced on slotted side FSs, while theory and computer simulations suggest that these voltages are induced by radial currents on antenna feeds. Triple probe measurements in the edge region of the Phaedrus-T tokamak suggest that the induced voltages modify edge plasma parameters and increase sheath potentials, which increase sputtering of the FS material and result in an increase of the impurity content of the plasma. These effects of the induced voltages can be eliminated by using insulating plates as FS side limiters

日本語訳

Phaedrus-Tトカマクにおいて、スロット付き側面ファラデーシールド(FS)に誘起されるRF電圧に関して行われた研究を要約する。大気中での直接測定により、スロット付き側面FSに誘起される電圧が示され、一方、理論およびコンピュータシミュレーションは、これらの電圧がアンテナ給電部の径方向電流によって誘起されることを示唆している。Phaedrus-Tトカマクの周辺領域におけるトリプルプローブ測定は、誘起電圧が周辺プラズマパラメータを変化させ、シース電位を増大させ、それによりFS材料のスパッタリングが増加し、プラズマの不純物含有量が増加することを示唆している。これらの誘起電圧の影響は、絶縁板をFS側面リミッタとして使用することにより排除できる。

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