The gas-discharge electron gun contains high-voltage located along its axis insulator, cold metal cathode, hollow anode and magnetic focusing lens, and the cold cathode is covered by the near-cathode electrode, which protrudes beyond the limits emission surface and the surface of the connection of the cathode to the insulator, and the protrusions in the cross-section have a rounded shape with a radius of 0.5 the width of the insulating gap between the near-cathode electrode and gun body, and their height is 1-1.5 of the width of the insulating gap.

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