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in electron and ionbeam sources with plasma emitter.' However, a signilIcant difference in value between igniting and operating dis-charge voltages motivates the use of special systems for discharge ignition. Such systems, operating under increasedpreaurcs as compared to the preesure in the hollow cathode or using a high voltage ignition pulses, complicate sourcedesign and its electric power supplies.To decrease gas pressure and keep out a need for gas bleeding into a discharge gap a hollow-cathode systemin magnetic field has been developed which don't require an ignition system to be used? Moreover, such a systems,based on a glow discharge. in magnetic leld, may be used as initiating ones to ignite an arc with a. cathode spot.3However, the mechanism of pulsed breakdown in long (1-10 cm) interelectrode gaps in weak electric (0.1-1 kY/cm) |
