Three dimensional corrugation of the plasma edge when magnetic perturbations are applied for ELM control in MAST

Three dimensional corrugation of the plasma edge when magnetic perturbations are applied for ELM control in MAST

Three dimensional corrugation of the plasma edge when magnetic perturbations are applied for ELM control in MAST 150 150 Mathew

Three dimensional corrugation of the plasma edge when magnetic perturbations are applied for ELM control in MAST

The distortion of the plasma boundary when three-dimensional resonant magnetic perturbations are applied has been measured in MAST H-mode plasmas. When the n = 3 resonant magnetic perturbations are applied to control edge localised modes, the plasma experiences a strong toroidal corrugation. The displacement of the plasma boundary is measured at various toroidal locations and found to be of the order of 5% of the minor radius for an applied field magnitude which mitigates ELMs. The empirically observed corrugation of the plasma edge position agrees well with three-dimensional ideal plasma equilibrium reconstruction.

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17/10/2012