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Soft x-ray measurements of resistive wall mode behavior in NSTX

L Delgado-Aparicio, D Stutman, S A Sabbagh, R E Bell, J W Berkery, K Tritz, S P Gerhardt, B LeBlanc, M Finkenthal, J P Levesque2011年Plasma Physics and Controlled FusionIF 2.2出版社

A multi-energy soft x-ray (ME-SXR) array is used for the characterization of resistive wall modes (RWMs) in the National Spherical Torus Experiment (NSTX). Modulations in the time history of the ME-SXR emissivity profiles indicate the existence of edge density and core temperature fluctuations in good agreement with the slow evolution of the n = 1 magnetic perturbation measured by the poloidal and radial RWM coils. The characteristic 20–25 Hz frequency in the SXR diagnostics is approximately that of the n = 1 stable RWM, which is also near the measured peak of the resonant field amplification (RFA) and inversely proportional to the wall time. Together with the magnetics, the ME-SXR measurements suggest that in NSTX the RWM is not restricted exclusively to the reactor wall and edge, and that acting with the stabilizing coils on its global structure may result in density and temperature fluctuations that can be taken into account when designing the feedback process.

日本語訳

マルチエネルギー軟X線(ME-SXR)アレイは、ナショナル球状トーラス実験装置(NSTX)における抵抗性壁モード(RWM)の特性評価に使用される。ME-SXR発光率プロファイルの時間履歴における変調は、ポロイダルおよびラジアルRWMコイルによって測定されたn = 1磁気摂動の緩やかな発展とよく一致する、エッジ密度およびコア温度の変動の存在を示す。SXR診断における特徴的な20〜25 Hzの周波数は、n = 1安定RWMの周波数とほぼ一致し、これはまた、共鳴磁場増幅(RFA)の測定ピーク付近にあり、壁の時定数に反比例する。磁気測定と併せて、ME-SXR測定は、NSTXにおいてRWMが単に炉壁およびエッジに限定されるものではなく、その全体構造に対する安定化コイルの作用が、フィードバックプロセスの設計時に考慮され得る密度および温度の変動をもたらす可能性があることを示唆している。

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NSTXSoft x-rayResistive wall mode
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