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Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas

C. Hidalgo, E. Ascasíbar, D. Alegre, A. Alonso, J. Alonso, R. Antón, A. Baciero, J. Baldzuhn, J.M. Barcala, L. Barrera2022年被引用 9Nuclear FusionIF 3出版社

TJ-II stellarator results on modelling and validation of plasma flow asymmetries due to on-surface potential variations, plasma fuelling physics, Alfvén eigenmodes (AEs) control and stability, the interplay between turbulence and neoclassical (NC) mechanisms and liquid metals are reported. Regarding the validation of the neoclassically predicted potential asymmetries, its impact on the radial electric field along the flux surface has been successfully validated against Doppler reflectometry measurements. Research on the physics and modelling of plasma core fuelling with pellets and tracer encapsulated solid pellet injection has shown that, although post-injection particle radial redistributions can be understood qualitatively from NC mechanisms, turbulence and fluctuations are strongly affected during the ablation process. Advanced analysis tools based on transfer entropy have shown that radial electric fields do not only affect the radial turbulence correlation length but are also capable of reducing the propagation of turbulence from the edge into the scrape-off layer. Direct experimental observation of long range correlated structures show that zonal flow structures are ubiquitous in the whole plasma cross-section in the TJ-II stellarator. Alfvénic activity control strategies using ECRH and ECCD as well as the relation between zonal structures and AEs are reported. Finally, the behaviour of liquid metals exposed to hot and cold plasmas in a capillary porous system container was investigated.

日本語訳

TJ-IIステラレーターにおける、表面電位変動によるプラズマ流非対称性のモデリングと検証、プラズマ燃料供給物理、アルヴェン固有モード(AEs)の制御と安定性、乱流と新古典(NC)機構の相互作用、および液体金属に関する結果が報告される。新古典論的に予測された電位非対称性の検証に関して、フラックス面上の径方向電場へのその影響は、ドップラー反射計測定との照合に成功した。ペレットおよびトレーサー封入固体ペレット注入によるプラズマ中心部燃料供給の物理とモデリングに関する研究は、注入後の粒子径方向再分布はNC機構から定性的に理解できるものの、アブレーション過程において乱流と変動が強く影響を受けることを示した。転移エントロピーに基づく高度解析ツールは、径方向電場が乱流の径方向相関長に影響を与えるだけでなく、周辺部からスクレイプオフ層への乱流伝播を低減することもできることを示した。長距離相関構造の直接実験観測により、帯状流構造がTJ-IIステラレーターのプラズマ断面全体に遍在することが示された。ECRHおよびECCDを用いたアルヴェン活性制御戦略と、帯状構造とAEの関係が報告される。最後に、キャピラリー多孔質システム容器内で高温および低温プラズマに曝露された液体金属の挙動が調査された。

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