Compatibility of large ELM control and stable partial detachment with neon/argon seeding in EAST
Compatibility of large ELM control and stable partial detachment with neon/argon seeding in EAST
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EAST 中大型 ELM 控制和稳定部分脱离与氖/氩播种的兼容性
DOI：
10.1088/1741-4326/acae36
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发表时间：
2022-12
期刊：
影响因子：
3.3
通讯作者：
Guang-Nan Luo
中科院分区：
文献类型：
--
作者：
Kedong Li;Xin Lin;Zhongshi Yang;Qingquan Yang;Guo Sheng Xu;Lingyi Meng;Yifeng Wang;Heng Lan;Bin Zhang;Liqing Xu;Kai Wu;Tao He;Jichan Xu;Jinhua Wu;Fang Ding;Yanmin Duan;Songtao Mao;Qing Zang;Ling Zhang;Tao Zhang;Fudi Wang;Liang Wang;Guang-Nan Luo
抽象的。在未来的聚变堆中，实现偏滤器靶上过量瞬态和稳态热流的同时排出是偏滤器保护的必要条件。在EAST中，持续的大ELM控制和稳定的部分脱离已经与氩（Ar）或氖（Ne）播种同时实现。随着Ne的注入，频率fELM ~ 100 Hz的大ELM消失，并保持稳定的无ELM状态，H98，y2 > 1。同时，电子温度泰特周围的较低的外部罢工点从70 eV以上的大ELM爆发期间减少到小于5 eV的稳定ELM的自由阶段。此外，在部分分离状态下观察到等离子体约束的轻微改善，这主要归因于核心区域中的电子密度ne和离子温度Ti的增加。在基座区，密度梯度和电子温度表现出微妙的变化。注入Ne后，有效电荷数Zeff显著增加，导致边缘自举电流和基座压力梯度减小，从而稳定了ELMs。随着Ar播种，大ELM也被抑制在第一，但很快过渡到III型ELM与高fELM ~ 1 kHz，高度相关的能量约束退化。在EAST装置上，注入Ar/Ne粒子可以有效地降低偏滤器上的稳态和瞬态热通量。
Abstract. It is necessary to achieve simultaneous exhaust of excessive transient and steady-state heat fluxes on the divertor target for the divertor protection in the future fusion reactors. The sustained large ELM control and stable partial detachment have been achieved concurrently with argon (Ar) or neon (Ne) seeding in EAST. With Ne seeding, the large ELMs with frequency fELM ~ 100 Hz disappear and a stable ELM-free state with H98,y2 > 1 is maintained. Meanwhile, the electron temperature Tet around the lower outer strike point decreases from more than 70 eV during the large ELM burst to less than 5 eV in the stable ELM-free phase. In addition, a slight improvement of plasma confinement is observed in the partially detached state, mainly attributed to the increased electron density ne and ion temperature Ti in the core region. In the pedestal region, the density gradient and the electron temperature show subtle variation. The effective charge number Zeff increases significantly after Ne seeding, leading to a decrease in the edge bootstrap current and the pedestal pressure gradient, and thus the stabilization of ELMs. With Ar seeding, the large ELMs are also suppressed at first, but soon transit to type-III ELMs with a high fELM ~ 1 kHz, highly correlated with the energy confinement degradation. The steady-state and transient heat fluxes on the divertor can be both well reduced with Ar/Ne seeding in EAST.
DOI：
10.1201/9781420033328
发表时间：
2000
期刊：
--
影响因子：
--
作者：
P. Stangeby
通讯作者：
P. Stangeby
影响因子：
2.2
作者：
P. Ghendrih
通讯作者：
P. Ghendrih