Abstract
Strongly overvoltage open discharges in a narrow gap (2-3 mm) between the solid cathode and the grid anode are used for generation of the pulsed high-current electron beams with the energy up to several tens of keV. Strongly overvoltage (SO) regime is unstable and the discharge tends to transit into low-voltage (LV) regime with a high-current. We studied this transition by example of the three-electrodes open discharge in D2 at low pressure (about 0.5-2 Torr) being powered by stepwise voltage with amplitude up to 25 kV. The existence of the auxiliary third electrode allows one to get more stable operation of the open discharge. The physical properties of the SO and LV regimes and transition between them have been explored in detail with the usage of the fast multi-frame camera synchronized with the current and voltage of the open discharge.
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