Feedback stabilisation of kink instability in TO-1 tokamak

Experimental results on the feedback stabilisation of kink instability in the TO-1 tokamak are reported. The amplitude of the magnetic probe signal was observed to decrease or increase depending on the phase in the feedback system. The amplitude decrease was accompanied by a 20% reduction in the discharge voltage, an increase in the electron temperature from 200 to 300 eV and an increase in the plasma density from 0.6 to 0.9.1013 cm-3. The feedback exerted a stabilising effect on the disruptive instability. The experimental results are explained using a simple theoretical model. (author)