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Key effects on the confinement improvement of the ASDEX Upgrade hybrid scenario

Xiang Jian, Vincent S. Chan, Jiale Chen, Alexander Bock, Hartmut Zohm, Emiliano Fable, Maximilian Reisner, Wenfeng Guo, Ge Zhuang2019年被引用 9Nuclear FusionIF 3出版社

Transport analysis of a fully non-inductive high performance ASDEX Upgrade (AUG) hybrid mode discharge (Bock 2017 Nucl. Fusion57 126041) is performed using a gyro-fluid transport code and a gyro-kinetic stability code. It is shown that the confluence of several mechanisms is essential for the improvement in core confinement. In addition to rotation shear, low magnetic shear, which is a common characteristic near the magnetic axis of a hybrid scenario, is found to be favorable for both electromagnetic and α stabilization. Together they facilitate the conditions for fast ions to establish a strong local internal transport barrier by providing additional dilution effect and enhancement of α stabilization. This study provides a complete picture and demonstrates that a quasilinear turbulent model is capable of quantitatively matching the experimental temperature profiles across the entire core of a hybrid mode discharge.

日本語訳

非誘導完全定常高性能ASDEX Upgrade(AUG)ハイブリッドモード放電(Bock 2017 Nucl. Fusion 57 126041)の輸送解析を、ジャイロ流体コードとジャイロ運動論的安定性コードを用いて実施した。コア閉じ込めの改善には、複数の機構の複合的な作用が本質的であることが示された。回転シアに加えて、ハイブリッドシナリオの磁気軸近傍に特徴的な低磁気シアが、電磁的安定化とα粒子安定化の両方に有利に働くことが見出された。これらが相まって、追加の希釈効果とα粒子安定化の増強をもたらすことにより、高速イオンが強い局所内部輸送障壁を形成するための条件が整う。本研究は全体像を提示し、準線形乱流モデルがハイブリッドモード放電のコア全体にわたる実験温度分布を定量的に再現できることを実証した。

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asdex-upgrade高精度(タイトル一致)

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ASDEXASDEX UpgradeHybrid scenario
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