Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST |
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| Affiliation: | 1.Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;2.University of Science and Technology of China, Hefei 230026, China;3.Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China |
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| Abstract: | A series of L-mode discharges have been conducted in the new ‘corner slot’ divertor on the Experimental Advanced Superconducting Tokamak (EAST) to study the divertor plasma behavior through sweeping strike point. The plasma control system controls the strike point sweeping from the horizontal target to the vertical target through poloidal field coils, with keeping the main plasma stability. The surface temperature of the divertor target cools down as the strike point moves away, indicating that sweeping strike point mitigates the heat load. To avoid the negative effect of probe tip damage, a method based on sweeping strike point is used to get the normalized profile and study the decay length of particle and heat flux on the divertor target λjs, λq. In the discharges with high radio-frequency (RF) heating power, electron temperature Te is lower and λjs is larger when the strike point locates on the horizontal target compared to the vertical target, probably due to the corner effect. In the Ohmic discharges, λjs, λq are much larger compared to the discharges with high RF heating power, which may be attributed to lower edge Te. |
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| Keywords: | EAST tokamak divertor plasma sweeping strike point decay length |
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