Self-sustaining secondary emission in magnetron guns, beam modulation and feedbacks

Abstract

This paper reports on computer simulations of an electron cloud formation inside a smooth-bore magnetron. Preliminary results were published in [1-3]. Computer simulations have been performed using 2.5D and 3D electromagnetic PIC code KARAT [4] for the magnetron diode (MD) with parameters close to experimental [5], and with an external voltage source V0(t) connected to MD via an RL-circuit. The yield of secondary electrons from the cathode takes into account the dependence of the yield on the energy of electrons and the angle between the direction of electron velocity and the perpendicular to the cathode surface, and also the threshold of secondary emission.