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Edge power deposition reduction in a tokamak by replacing the Faraday screen on an RF antenna with an insulator

J. Sorensen, D.A. Diebold, R. Majeski, N. Hershkowitz1996年被引用 10Nuclear FusionIF 3出版社

Calculations show that the power coupled to the regions around the RF antenna (side, front and interior) due to the edge plasma interaction with voltages induced on the antenna structure of the Phaedrus-T tokamak was reduced from nearly 11 kW to a few hundred watts for 40 kW of RF input power by replacing the Faraday screen (FS) surrounding the antenna with insulating boron nitride (BN) side limiters. When an FS was on the antenna, calculations show that 7.7 kW of the power coupled to the edge was transferred to the electrons that passed through a potential gradient while crossing field lines and 3 kW was dissipated by ions falling through an increased sheath at the carbon limiter and FS. Experimental data of edge plasma parameters, loading resistance and intensity of VUV impurity light support the conclusion that less power was deposited in the edge plasma when the antenna had only BN side limiters than when it was covered with an FS

日本語訳

計算により、Phaedrus-Tトカマクのアンテナ構造に誘起された電圧との周辺プラズマ相互作用による、RFアンテナ周辺領域(側面、前面、内部)への結合電力は、アンテナを囲むファラデーシールド(FS)を絶縁性窒化ホウ素(BN)側面リミッタに交換することで、40 kWのRF入力電力に対して、ほぼ11 kWから数百ワットに低減されたことが示される。アンテナにFSが装着されていた場合、計算によると、周辺部に結合された電力のうち7.7 kWは、磁力線を横切る際に電位勾配を通過した電子に伝達され、また3 kWは、カーボンリミッタおよびFSにおいて増大したシースを通って落下するイオンによって散逸された。周辺プラズマパラメータ、負荷抵抗、およびVUV不純物光の強度の実験データは、アンテナがBN側面リミッタのみを有する場合の方が、FSで覆われていた場合よりも、周辺プラズマに堆積される電力が少なかったという結論を支持する。

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