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Rotating n=2 resonant magnetic perturbation modifies nitrogen radiation near the X-point on EAST
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DOI：10.1088/1741-4326/ae63e3.png)
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Abstract
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This work investigates the impact of n = 2 resonant magnetic perturbations (RMPs) on nitrogen radiation near the X-point and divertor particle fluxes in Experimental Advanced Superconducting Tokamak with a predominantly metallic wall. Using Divertor High-speed Camera Diagnostics, distinct multi-layer nitrogen radiation structures are observed during RMP. These structures rotate synchronously with a 2 Hz rotating n = 2 RMP field, indicating strong coupling between impurity radiation and the underlying three-dimensional magnetic topology. Field line tracing with the TOP2D code, combined with linear MHD plasma response, calculated by MARS-F code, reproduces the number, location, and toroidal phase of the observed lobe structures, showing good agreement with experimental observations. Under favorable RMP phase conditions, the radiation region broadens, particle flux is redistributed onto secondary strike points, and the core tungsten concentration decreases. A positive correlation between tungsten concentration and total radiated power suggests that global radiation is strongly influenced by tungsten behavior. These results demonstrate that RMP-induced three-dimensional magnetic perturbations play a key role in governing impurity radiation and particle flux redistribution, providing insight into the control of edge radiation in tokamak plasmas.
Keywords:
nitrogen seeding
RMP
radiation distribution
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