Abstract
Different regimes of operation of a miniature 1 cm-size dc discharge are studied in kinetic particle-in-cell simulations. The glow of low voltage dc discharge in helium at Torr is sustained by the electron current emitted from a heated cathode. A diaphragm with a hole in the center is placed at a certain distance from the anode to restrict the current channel. A double layer structure appears near the diaphragm hole when the diaphragm is on the floating potential. This double layer structure plays the key role in plasma formation by changing the shape of electron energy distribution function. As in previous experiment [], in our simulation the transition between different regimes of discharge glow is driven by increasing the voltage applied to the diaphragm.
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