Simulation study of the disruption load in KSTAR device with a modified passive stabilizer

The structure of the passive stabilizer system in KSTAR (Korea Superconducting Tokamak Advanced Research) device was recently modified mainly in relation to the upgrade of the vertical position control system. Corresponding to this design change in one of the plasma facing components, a simulation study was performed to see how the disruption load and the characteristics varied. During the vertical drift phase, the vertical growth rate is shown to be increased by about 8 times while the vertical force on the passive stabilizer is reduced by about 5 times for the new passive stabilizer compared with the old one. Meanwhile, during the thermal and current quench phase, relatively small differences were observed in the disruption load and characteristics between the two models.