Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST
Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST
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EAST 中 LHW 和 ECRH 联合加热减少杂质限制时间
DOI：
10.1088/1674-1056/abe1a6
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发表时间：
2021
影响因子：
1.7
通讯作者：
Liu Hai-Qing
中科院分区：
文献类型：
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作者：
Xu Zong;Wu Zhen-Wei;Zhang Ling;Huang Yue-Heng;Gao Wei;Cheng Yun-Xin;Lin Xiao-Dong;Gao Xiang;Chen Ying-Jie;Li Lei;Jie Yin-Xian;Zang Qing;Liu Hai-Qing
采用低杂化波（LHW）和电子回旋共振加热（LHW+ ECRH）对实验先进超导托卡马克（EAST）等离子体的核心杂质约束特性进行了实验研究。结果表明，在LHW和ECRH共同加热的l模等离子体中，杂质约束时间（τ imp）与电子密度的依赖关系较弱，而与加热功率的依赖关系较强，因此在相同的等离子体参数下，LHW和ECRH共同加热的l模等离子体的约束时间要短。LHW和ECRH联合加热可以减少碰撞，为降低堆芯τ imp和提高归一化极向β (β P)提供了一种更有效的加热方法。应该强调的是，在这个高β P操作窗口中，可以获得小ELM区域，并且可以同时获得l模式水平τ imp （40 ms - 80 ms）和高β N（~ 1.7）。这意味着这种典型的小ELMy h模区在避免严重的钨积累方面具有优势，并且在未来高z材料等离子体面组件的长脉冲稳态和高性能工作中具有竞争力。
The core impurity confinement properties are experimentally investigated in the Experimental Advanced Superconducting Tokamak (EAST) plasma heated by lower hybrid wave (LHW) and electron cyclotron resonance heating (ECRH)(LHW+ ECRH). It is shown that the impurity confinement time (τ imp) in the L-mode plasma jointly heated by LHW and ECRH is weakly dependent on electron density but strongly dependent on the heating power, thus it is shorter than that in LHW-only heated L-mode plasma with the similar plasma parameters. The combined heating of LHW and ECRH can reduce the collisionality and indicates a more effective heating method for core τ imp reduction and normalized poloidal beta (β P) improvement. It should be emphasized that in this high β P operation window the small ELM regime can be accessed, and an L-mode level τ imp (40 ms–80 ms) and high β N (∼ 1.7) can be obtained simultaneously. It means that this typical small ELMy H-mode regime has an advantage in avoiding the serious tungsten accumulation, and will be competitive in future long-pulse steady-state and high-performance operation with high-Z material plasma-facing components.