In a cylindrical channel electron multiplier, self-sustained oscillating currents of ions and electrons are generated in certain circumstances. This behaviour is influenced by the voltage applied across the tube terminals, by the length and diameter of the tube, the resistance and capacitance of the inner wall coating, its secondary emission properties and by the pressure of the residual gas in the tube. A model is proposed which permits one to calculate, at least semi-quantitatively, the behaviour of the oscillating currents; amplitude, frequency and triggering conditions of the electro-ionic cascade.
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