Apparatus for producing and sustaining a glow discharge plasma in a plasma
discharge space comprising at least two oppositely spaced electrodes,
means for supplying a gas or a gas mixture under atmospheric pressure
conditions in the discharge space, AC power supply means for energizing
the electrodes, and electric stabilisation means for stabilizing current
variations in the plasma. The stabilisation means connect between the
electrodes and the power supply means, and are arranged for providing a
negative feedback opposed to a positive feedback of the plasma to
instabilities in the plasma.
