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Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas

T. Kobayashi, K. Ida, S. Inagaki, H. Tsuchiya, N. Tamura, G.H. Choe, G.S. Yun, H.K. Park, W.H. Ko, T.E. Evans2017年被引用 9Nuclear FusionIF 3出版社

In this contribution we analyze modulation electron cyclotron resonance heating (MECH) experiment and discuss higher harmonic frequency dependence of transport coefficients. We use the bidirectional heat pulse propagation method, in which both inward propagating heat pulse and outward propagating heat pulse are analyzed at a radial range, in order to distinguish frequency dependence of transport coefficients due to hysteresis from that due to other reasons, such as radially dependent transport coefficients, a finite damping term, or boundary effects. The method is applied to MECH experiments performed in various helical and tokamak devices, i.e. Large Helical Device (LHD), TJ-II, Korea Superconducting Tokamak Advanced Research (KSTAR), and Doublet III-D (DIII-D) with different plasma conditions. The frequency dependence of transport coefficients are clearly observed, showing a possibility of existence of transport hysteresis in flux-gradient relation.

日本語訳

本稿では、変調電子サイクロトロン共鳴加熱(MECH)実験を解析し、高次高調波周波数依存性の輸送係数について議論する。我々は、内向きに伝播する熱パルスと外向きに伝播する熱パルスの両方を動径範囲で解析する双方向熱パルス伝播法を用いて、ヒステリシスによる輸送係数の周波数依存性を、動径依存性のある輸送係数、有限の減衰項、または境界効果などの他の理由によるものと区別する。この方法は、様々なヘリカル装置およびトカマク装置、すなわち大型ヘリカル装置(LHD)、TJ-II、韓国超伝導トカマク先端研究装置(KSTAR)、およびダブルットIII-D(DIII-D)において、異なるプラズマ条件で実施されたMECH実験に適用される。輸送係数の周波数依存性が明確に観察され、フラックス-勾配関係における輸送ヒステリシスの存在の可能性が示される。

装置

diii-d中精度(概要文一致)kstar中精度(概要文一致)lhd中精度(概要文一致)tj-ii中精度(概要文一致)
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