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1 | Investigations of electrical breakdown in acceleration gap of plasma cathode electron source are presented. The tested pressure range 0,01 -0,1 Torr is produced by only mechanical pumps. It is stated breakdown volt¬age decreases with emission current growth. The most probable reason is electric field growth because of ac¬celeration gap shortening as a result of plasma produc¬ing near accelerating electrode. | 1020 |