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Lower hybrid wave coupling in PBX-M

R.E. Bell, S. Bernabei, N. Greenough, L. Lagin, B. Leblanc, M. Okabayashi, H. Takahashi, L. Schmitz, L. Blush, R.P. Doerner1994年被引用 6Nuclear FusionIF 3出版社

The coupling of the waves launched from a 4.6 GHz lower hybrid (LH) system into PBX-M plasmas has been studied for both L mode and H mode plasmas. The characteristics of the plasma in front of the LH coupler have been measured with a fast Langmuir probe. The reflected power of the coupler has been measured across the transition to the H mode as a function of phase and the distance between the coupler and the separatrix. A transient rise in the LH reflection coefficient was observed near the L-H transition under some conditions. Coupling depends primarily on the electron density in the vicinity of the coupler, and proper positioning of the coupler can compensate for changes in the plasma edge due to H mode transitions. Good coupling can be maintained throughout the H mode

日本語訳

4.6 GHzの下部ハイブリッド(LH)システムからPBX-Mプラズマへ発射される波の結合が、LモードおよびHモードプラズマの両方について研究された。LHカプラの前方のプラズマの特性は、高速ラングミュアプローブを用いて測定された。カプラの反射電力は、Hモードへの遷移を通して、位相およびカプラとセパラトリックス間の距離の関数として測定された。LH反射係数の過渡的な上昇が、いくつかの条件下でL-H遷移付近で観測された。結合は主にカプラ近傍の電子密度に依存し、カプラの適切な位置決めにより、Hモード遷移によるプラズマ端部の変化を補償できることが示された。良好な結合はHモード全体を通して維持できる。

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