Divertor operation in stellarators: results from W7-AS and implications for future devices
Divertor operation in stellarators: results from W7-AS and implications for future devices
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仿星器中的偏滤器操作：W7-AS 的结果以及对未来设备的影响
DOI：
10.1016/s0920-3796(03)00121-2
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
W. Team
中科院分区：
文献类型：
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作者：
P. Grigull;K. Mccormick;H. Renner;S. Masuzaki;R. König;J. Baldzuhn;S. Bäumel;R. Burhenn;R. Brakel;H. Ehmler;Y. Feng;F. Gadelmeier;L. Giannone;D. Hartmann;D. Hildebrandt;M. Hirsch;R. Jaenicke;J. Kisslinger;T. Klinger;J. Knauer;D. Naujoks;H. Niedermeyer;E. Pasch;N. Ramasubramanian;F. Sardei;F. Wagner;U. Wenzel;A. Werner;W. Team
仿星器偏滤器的研究尚处于起步阶段。正在准备对大型螺旋装置（LHD）和W7-X进行广泛的研究。W7-AS目前正与一个开放岛式偏滤器（ID）一起运行，该偏滤器作为W7-X偏滤器的试验台。偏滤器使获得一个新的NBI加热，高密度的操作制度，改善了限制性能。这种制度的高密度H-模式（HDH）-显示没有明显的模式活动，是现存的阈值密度以上，其特征在于平坦的密度分布，高能量和低杂质的限制时间和边缘局部辐射。避免了通常与无ELM H模式相关的杂质积累。准稳态放电，n值高达4× 1020 m −3，边缘辐射水平高达90%，等离子体部分脱离偏滤器靶可以同时实现。在W7-AS中，对其他改进的限制模式（传统的H模式和OC模式）的可达性不受偏滤器的限制。结果为未来的实验，特别是W7-X，提供了一个有前途的基础，并建议ID作为一个严重的候选人解决等离子体排气问题仿星器。
The research on divertors for stellarators is at the beginning. Extensive studies are being prepared on large helical device (LHD) and W7-X. W7-AS is now being operated with an open island divertor (ID) which serves as a test bed for the W7-X divertor. The divertor enables access to a new NBI-heated, high-density operating regime with improved confinement properties. This regime—the high-density H-mode (HDH)—displays no evident mode activity, is extant above a threshold density and characterized by flat density profiles, high-energy- and low-impurity-confinement times and edge-localized radiation. Impurity accumulation, normally associated with ELM-free H-modes, is avoided. Quasi-steady-state discharges with n ̄eup to 4×1020m−3, edge radiation levels up to 90% and plasma partial detachment at the divertor targets can be simultaneously realized. The accessibility to other improved confinement modes in W7-AS (conventional H-mode and OC-mode) is not restricted by the divertor. The results provide a promising basis for future experiments, in particular on W7-X, and recommend the ID as a serious candidate for solving the plasma exhaust problem in stellarators.