期刊
NUCLEAR SCIENCE AND TECHNIQUES
卷 32, 期 9, 页码 -出版社
SPRINGER SINGAPORE PTE LTD
DOI: 10.1007/s41365-021-00929-4
关键词
Tungsten accumulation; Counter-NBI; Favorable B-t; ELMy H-mode; EAST
资金
- National Key R&D Program of China [2018YFE0311100, 2017YFE0301205]
- National Natural Science Foundation of China [11905146, 11775269, 11575244, 11575249, 11575235, 11422546, 11805133, U19A20113]
- Users with Excellence Program of Hefei Science Center, CAS [2019HSC-UE014]
- National Magnetic Confinement Fusion Science Program of China [2015GB110005, 2015GB103003, 2015GB101002, 2015GB103000]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSWSLH001]
- CASHIPS Director's Fund [BJPY2019A01]
- Shenzhen Clean Energy Research Institute
The experimental investigation on tungsten behavior in ELMy H-mode plasmas with different NBI directions and B-t orientations at EAST showed that tungsten accumulation can be reduced by counter-NBI with favorable B-t, thus improving plasma performance and extending the operational window.
The first experimental investigation of the tungsten behavior in ELMy H-mode plasmas with co-/counter neutral beam injection (NBI) and unfavorable/favorable B-t was performed on EAST. Tungsten was found to accumulate easily in ELMy H-mode plasma with co-NBI heating and unfavorable B-t. 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 + E-r inward pinch velocity and reverses the direction of neoclassical inward convection, thus decreasing the tungsten concentration from similar to 7 x 10(-5) to similar to 2 x 10(-5) in type-I ELMy H-mode plasma with favorable B-t. A comparison of the effects of different B-t directions on the tungsten behavior also shows that favorable B-t is beneficial for reducing the tungsten concentration in the core plasma. These results imply that counter-NBI with favorable B-t can 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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