Study Of Bootstrap Current And Peeling-Balloon Mode Stability For H-mode Discharge In Tokamak

In order to maintain a high steady-state tokamak operation constraint and reduce costs, we must increase the portion of non-inductive current, increase the proportion of the bootstrap current. This paper numerical simulation EAST device discharges using LHCD as the sole auxiliary heating source in H-mode discharge experiments. LSC and JSOLVER code are coupled to calculate and forecast bootstrap current during H-mode at different LHW power, plasma density and temperature. Due to the normalized beta value is small we found that the proportion of the bootstrap current is low and not up to10%under this condition. Plasma parameters and LHW power have little impact on the distribution and the proportion of the bootstrap current. But the edge bootstrap current in proportion to the total current is larger, more than30%, this large current inspire a Peeling-balloon instability at the edge area. The peeling-ballooning stability and pedestal bootstrap currents relation for two H-mode typical discharges on the EAST are studied by using our numerical simulation code. During H-mode discharge, safety factor around edge area is equal to4, Peeling-balloon mode is stable but when the safety factor is about5, peeling-balloon is unstable. This study plays an important role and refers for fusion devices experiment.