Modeling of emission slump by ion bombardment of a Ba-dispenser cathode in an electron tube

Abstract

Emission distribution simulation on the cathode surface under ion bombardment shows greater ion bombardment damage on the cathode center than on the periphery. For example, for a klystron gun (5 × 10-8 Torr CO), 46% emission decay occurred on the cathode center, although total emission decayed only 2%.