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Tungsten control in type-I ELMy H-mode plasmas on EAST
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 steadystate 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 ~7×10~(-5) to ~2×10~(-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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Nuclear Science and Techniques
2021年09期
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