Progress of long pulse and H-mode experiments in EAST
Progress of long pulse and H-mode experiments in EAST
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DOI：
10.1088/0029-5515/53/10/104006
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发表时间：
2013-10-01
期刊：
影响因子：
3.3
通讯作者：
Gong, Xianzhu
中科院分区：
文献类型：
--
作者：
Wan, Baonian;Li, Jiangang;Gong, Xianzhu
自上次国际原子能机构FEC以来，在EAST（实验性先进超导托卡马克）中，在技术和物理方面，在高性能、长脉冲等离子体放电方面取得了重大进展。随着操作能力的增强，锂壁调节取得了以下关键结果：完全由低混合电流驱动（LHCD）驱动的完全稳态长脉冲转移等离子体超过400秒，LHCD和离子回旋共振加热（ICRF）驱动的稳定h模式放电超过30秒。在H-IPB98（y,H-2）为0.7到超过1的范围内，实现了具有多种边缘局域模式（elm）的h模，为h模物理的研究提供了很大的机会。以射频加热为主导的新的令人兴奋的物理学已经出现，包括lhcd诱导的3D边缘磁拓扑及其对ELM动力学和粒子和热沉积的影响的新发现；纬向流在L-H过渡和i相中的作用；在h型基座处形成新的湍流循环状态。各种缓解elm的方法也被证明可以促进长脉冲操作，包括超音速分子束注射，以及创新的固体Li颗粒注射。本文对这些最新进展作了简要概述。
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 H-IPB98(y,H-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.