Tungsten control in type-I ELMy H-mode plasmas on EAST

Tungsten control in type-I ELMy H-mode plasmas on EAST
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EAST 上 I 型 ELMy H 模式等离子体中的钨控制

DOI:
10.1007/s41365-021-00929-4
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发表时间:
2021-09
影响因子:
2.8
通讯作者:
Team East
Team East
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xu Zong;Wu Zhen-Wei;Zhang Ling;Cheng Yun-Xing;Gao Wei;Lin Xiao-Dong;Gao Xiang;Chen Ying-Jie;Huang Yue-Heng;Huang Juan;Zang Qing;Jie Yin-Xian;Duan Yan-Min;Li Ying-Ying;Liu Hai-Qing;Xu Guo-Sheng;Team East

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在EAST上首次对ELMy H模等离子体中钨的行为进行了实验研究。发现钨在具有co-NBI加热和不可消除的Bt的ELMy H模式等离子体中容易积累。因此,在这种情况下,钨浓度可能超过10−4,导致等离子体约束和周期性H-L跃迁的退化。为了降低稳态I型ELMy H模操作中的钨浓度,施加反NBI以修改密度和温度并制动等离子体环形旋转。反NBI使PHZ +Erinward箍缩速度减小,新经典内对流方向发生逆转,从而使含Bt的I型ELMy H模等离子体中钨浓度从约7 × 10− 5降低到约2 × 10− 5。比较了不同的B方向对钨行为的影响,也表明可选择的B方向有利于降低芯等离子体中的钨浓度。这些结果表明,用可补偿的Bt来对抗NBI可以有效地防止钨的积累,并为探索EAST稳态I型ELMy H模式操作扩展了操作窗口。
The first experimental investigation of the tungsten behavior in ELMy H-mode plasmas with co-/counter neutral beam injection (NBI) and unfavorable/favorableBtwas performed on EAST. Tungsten was found to accumulate easily in ELMy H-mode plasma with co-NBI heating and unfavorableBt. Thus, in this case the tungsten concentration can exceed 10−4, resulting in degradation of the plasma confinement and periodic H–L transitions. To reduce the tungsten concentration in steady-state type-I ELMy H-mode operation, counter-NBI is applied to modify the density and temperature and brake the plasma toroidal rotation. The applied counter-NBI decreases the PHZ +Erinward pinch velocity and reverses the direction of neoclassical inward convection, thus decreasing the tungsten concentration from ~ 7 × 10−5to ~ 2 × 10−5in type-I ELMy H-mode plasma with favorableBt. A comparison of the effects of differentBtdirections on the tungsten behavior also shows that favorableBtis beneficial for reducing the tungsten concentration in the core plasma. These results imply that counter-NBI with favorableBtcan effectively prevent tungsten accumulation and expand the operating window for exploring steady-state type-I ELMy H-mode operation of EAST.
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