Characteristics of divertor heat flux distribution with an island divertor configuration on the J-TEXT tokamak

Plasma Science and Technology Pub Date : 2024-07-26 DOI:10.1088/2058-6272/ad6816

Yutong Yang, Yunfeng Liang, Wei Yan, Shuangbao Shu, Jiankun Hua, Song Zhou, Qinghu Yang, Jinlong Guo, Ziyang Jin, Wei Xie

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Abstract

On J-TEXT, the temporal evolution of heat flux distribution on the high-field side (HFS) divertor plate has been measured by an infrared (IR) camera during the plasma operation with an island divertor configuration. In experiments, the island divertor configuration is an edge magnetic island chain structure surrounded by stochastic layers, which can be induced by resonant magnetic perturbations (RMPs). The experimental results show that the heat flux distribution on the HFS target plate depends significantly on the edge magnetic topology. Furthermore, the impact of Hydrogen fuelling by using supersonic molecular beam injection (SMBI) on the divertor heat flux distributions has also been studied on J-TEXT with an island divertor configuration. It has been observed that the power-detachment can be achieved when the radiation front approached the last closed flux surface (LCFS) after each SMBI pulse. This result may provide a method on access of divertor detachment on a fusion device with a three-dimensional (3D) boundary magnetic structure.

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J-TEXT托卡马克上采用岛式分流器配置的分流器热通量分布特征

在 J-TEXT 上，使用红外（IR）照相机测量了高场侧（HFS）分流板上热通量分布的时间演变，该分流板在等离子体运行期间采用岛式分流板配置。在实验中，岛式分流器配置是由随机层包围的边缘磁岛链结构，可由共振磁扰动（RMP）诱发。实验结果表明，HFS 靶板上的热通量分布在很大程度上取决于边缘磁拓扑结构。此外，还研究了采用超音速分子束注入（SMBI）的氢燃料对岛式分流器配置的 J-TEXT 分流器热通量分布的影响。研究发现，在每个 SMBI 脉冲之后，当辐射前沿接近最后一个封闭通量面（LCFS）时，可以实现功率脱离。这一结果可能为在具有三维（3D）边界磁结构的聚变装置上实现分流器脱离提供了一种方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Plasma Science and Technology

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