Abstract
Magnetohydrodynamic equilibrium configurations with hollow current density profiles in the HL-2A tokamak are reconstructed for pellet injection discharges. The experimental data of pressure profiles, resulting from electron temperature measurements and a model density profile, analogous to that measured in the JET experiment, and Mirnov pickup coil signals are employed in the reconstructions. It is explicitly shown for the first time that configurations with hollow current density profiles may be realized by multiple pellet injection in HL-2A tokamak experiments. The reconstructed results show there exists a negative magnetic shear region in the plasma core which would benefit confinement improvement.
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