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Characterization of saturated MHD instabilities through 2D electron temperature profile reconstruction from 1D ECE measurements

M. Sertoli, L. Horváth, G.I. Pokol, V. Igochine, L. Barrera, the ASDEX Upgrade Team2013年被引用 6Nuclear FusionIF 3出版社

A new method for the reconstruction of two-dimensional (2D) electron temperature profiles in the presence of saturated magneto-hydro-dynamic (MHD) modes from the one-dimensional (1D) electron cyclotron emission (ECE) diagnostic is presented. The analysis relies on harmonic decomposition of the electron temperature oscillations through short time Fourier transforms and requires rigid poloidal mode rotation as the only assumption. The method is applicable to any magnetic perturbation as long as the poloidal and toroidal mode numbers m and n are known. Its application to the case of a (m, n) = (1, 1) internal kink mode on ASDEX Upgrade is presented and a new way to estimate the mode displacement is explained. For such modes, it is shown that the higher order harmonics usually visible in the ECE spectrogram arise also for the pure m = n = 1 mode and that they cannot be directly associated with m = n > 1 magnetic perturbations. This method opens up new possibilities for electron heat transport studies in the presence of saturated MHD modes and a way to disentangle the impurity density contributions from electron temperature effects in the analysis of the soft x-ray data.

日本語訳

飽和した電磁流体力学(MHD)モードの存在下での二次元(2D)電子温度分布を、一次元(1D)電子サイクロトロン放射(ECE)計測から再構成するための新しい方法を提示する。この解析は、短時間フーリエ変換による電子温度振動の高調波分解に依存し、剛体的なポロイダルモード回転を唯一の仮定として必要とする。この方法は、ポロイダルおよびトロイダルモード数mおよびnが既知である限り、任意の磁気摂動に適用可能である。ASDEX Upgradeにおける(m, n) = (1, 1)内部キンクモードの場合への適用を示し、モード変位を推定する新しい方法を説明する。このようなモードについて、ECEスペクトログラムに通常見られる高次高調波は、純粋なm = n = 1モードでも生じ、m = n > 1の磁気摂動に直接関連付けることはできないことが示される。この方法は、飽和したMHDモードの存在下での電子熱輸送研究に新たな可能性を開き、軟X線データの解析において、不純物密度の寄与を電子温度効果から分離する方法を提供する。

装置

asdex-upgrade低精度(概要文一致)

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MagnetohydrodynamicsElectron cyclotron emissionMHD instabilities
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