A magnetron is a two-electrode
valve in which the flow of electrons
from a large central cathode
to a cylindrical anode
is controlled by crossed electric
fields; the electrons gyrate
in the axial
magnetic field, their energy being collected
in a series of slot resonator
s in the face of the anode.
Magnetrons, used mainly as oscillators, can produce pulsed output at microwave frequencies, with high peak power ratings. Used as microwave and RADAR transmitters, and microwave ovens.