A non-relativistic multi-fluid plasma axisymmetric equilibrium model 1 was developed recently to account for the presence of an energetic electron fluid. The equilibrium formulation of a multi-fluid plasma with relativistic energetic electrons is developed and reported in this paper. The formulation is then applied to a four-fluid plasma composed of a relativistic energetic electron fluid, one thermal electron fluid, and fluids of two thermal ion species. This equilibrium model is relevant to the analysis of a toroidal hydrogenic plasma with a dominant impurity species (e.g., carbon) and an energetic electron component (e.g., runaway-like electrons).
To obtain a quantitative understanding of recent radiative divertor experiments and to give an instructive prediction for future relative work performed on EAST, The 2D numerical tool SOLPS has been used to investigate the argon seeded EAST H-mode plasmas. The simulations were mainly based on a typical H-mode discharge with lower single null divertor configuration, in which the partially detached divertor plasma has been achieved due to the argon seeding. First the perpendicular particle and energy transport coefficients for particle density diffusivity D⊥, electron and ion conduction, χ⊥ i,e were radially varied to determine the edge transport barrier in H-mode plasma by comparing the simulated upstream profiles of electron temperature (T e) and electron density (n e) with the edge Thomson scattering data. Then the reduction of the particle flux, static pressure and the peak heat load onto the lower outer divertor target have been reproduced by radiative divertor simulations in agreement with the experimental measurements, which demonstrated that the argon seeding is effective to mitigate the heat load onto the divertor target and achieve partially detached plasma during H-mode discharge. The simulations also revealed that the strongest radiation occurred near the X-point and in the divertor region for short pulsed argon seeding with a relatively low puffing rate in agreement with bolometer measurements.
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