Kinetic stabilization of tilt disruption in field reversed configurations

The process of kinetic stabilization of the tilt disruption in a field reve rsed configuration is investigated by means of a three dimensional particle simulation. For the case of no ion beam the growth rate of the tilt instab ility decreases as the plasma beta value at the magnetic separatrix, beta(s p), increases. This stabilization effect originates from the 'anchoring ion s' which exist in the vicinity of the magnetic separatrix and act as an 'an chor' 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 beta(sp ) plasmas.