Kinetic stabilization of tilt disruption in field reversed configurations

The process of kinetic stabilization of the tilt disruption in a field reversed configuration is investigated by means of a three dimensional particle simulation. For the case of no ion beam the growth rate of the tilt instability decreases as the plasma b value at the magnetic separatrix, bsp, increases. This stabilization effect originates from the `anchoring ionsʹ which exist in the vicinity of the magnetic separatrix and act as an `anchorʹ to hold the internal plasma to the external plasma. The tilt mode is also found to be stabilized by injecting an ion beam with about 20% of the ion thermal energy in the vicinity of the null point even for small bsp plasmas.