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Plasma edge turbulence probing and feedback control and stabilization experiments

T. Uckan, B. Richards, R.D. Bengtson, B.A. Carreras, Guoxiang Li, P.D. Hurwitz, W.L. Rowan, H.Y.W. Tsui, A.J. Wootton1995年被引用 20Nuclear FusionIF 3出版社

Experiments in modifying plasma edge turbulence were carried out on the Texas Experimental Tokamak (TEXT) by launching waves using two electrostatic probes in the shadow of the limiter. Measurements indicate that the wave, launched with a typical frequency range of 15 to 50 kHz from the edge of the machine top, is received by sensing probes located halfway around the torus. The detected signal strength depends weakly on the frequency of the wave and on the phasing of the applied AC signal between the launching probes. Modifications to the spectrum of the edge potential fluctuations are observed at the launching frequency. These experiments have been extended to the control of the edge plasma fluctuation level using feedback. The launcher is driven by the floating potential of the fluctuating plasma at the location of the launching probes. Edge fluctuations are reduced or excited, depending on the phasing between the launching probes, both locally and at the downstream sensing probes. The fluctuation induced particle flux as well as the local plasma parameters are affected by feedback phasing

日本語訳

プラズマ端部の乱流を改変する実験が、テキサス・トカマク(TEXT)において、リミターの影の中にある2つの静電プローブを用いて波を励起することにより実施された。測定によれば、機械上部の端部から15〜50 kHzの典型的な周波数範囲で励起された波は、トーラスの半周に位置する検出プローブによって受信される。検出された信号強度は、励起周波数および励起プローブ間に印加される交流信号の位相に弱く依存する。励起周波数における端部電位変動スペクトルの改変が観測される。これらの実験は、フィードバックを用いた端部プラズマ変動レベルの制御へと拡張された。励起器は、励起プローブの位置における変動プラズマの浮遊電位によって駆動される。端部変動は、励起プローブ間の位相に依存して、局所的にも下流の検出プローブ位置においても低減または増大する。変動によって誘起される粒子フラックスおよび局所プラズマパラメータは、フィードバック位相の影響を受ける。

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Edge turbulence
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