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Progress of long pulse and H-mode experiments in EAST

Baonian Wan, Jiangang Li, Houyang Guo, Yunfeng Liang, Guosheng Xu, Xianzhu Gong for the EAST Team, International Collaborators2013年被引用 126Nuclear FusionIF 3出版社

Significant progress, on both the technological and physical fronts, towards high-performance, long-pulse plasma discharges has been made in EAST (the experimental advanced superconducting tokamak) since the last IAEA FEC. With enhanced operational capabilities, the following key results have been achieved with lithium wall conditioning: fully steady-state long-pulse diverted plasmas entirely driven by the lower hybrid current drive (LHCD) over 400 s and stationary H-mode discharges over 30 s with LHCD and ion cyclotron resonant heating (ICRF). H-modes with various types of edge localized modes (ELMs) have been achieved with HIPB98(y,2) ranging from 0.7 to over unity, providing great opportunities for the study of H-mode physics. New and exciting physics with dominant radio-frequency heating has emerged, including new findings of LHCD-induced 3D edge magnetic topology and its effect on ELM dynamics and particle and heat deposition; the role of zonal flows during the L–H transition and I-phase; and a new turbulence-flow cycle state at the H-mode pedestal. Various means for mitigating ELMs have also been demonstrated to facilitate long-pulse operation, including supersonic molecular beam injection, as well as innovative solid Li granule injection. A brief overview of these recent advances is presented.

日本語訳

前回のIAEA FEC以降、EAST(実験先進超伝導トカマク)において、高性能・長パルスプラズマ放電に向けた技術的・物理的両面での顕著な進展が達成された。強化された運転能力により、リチウム壁調整を用いて以下の主要な成果が得られた:低混合同軸加熱(LHCD)のみによる400秒を超える完全定常長パルスダイバータプラズマ、ならびにLHCDとイオンサイクロトロン共鳴加熱(ICRF)を併用した30秒を超える定常Hモード放電の実現。さらに、様々な周辺局在モード(ELM)を伴うHモードが、HIPB98(y,2)が0.7から1を超える範囲で達成され、Hモード物理の研究に多大な機会を提供している。高周波加熱が支配的な新規かつ魅力的な物理が明らかになり、LHCD誘起による3次元端部磁気トポロジーとそのELMダイナミクスおよび粒子・熱輸送への影響、L-H遷移およびI相における帯状流の役割、Hモード台座部における新たな乱流-帯状流サイクル状態などが含まれる。さらに、超音速分子ビーム入射や革新的な固体リチウムペレット入射など、長パルス運転を容易にするための多様なELM緩和手法が実証された。本稿では、これらの最近の進展について概説する。

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