MAGNETRON HAVING TRIGGERING EMITTERS AT END SHIELDS OF CATHODE ASSEMBLIES Russian patent published in 2014 - IPC H01J25/50 

FIELD: physics.

SUBSTANCE: invention relates to electronic engineering and is intended for use in high- and ultra high-power magnetrons in the centimetre, millimetre and sub-millimetre wavelength range. The result is achieved through structural division of the cathode assembly of the magnetron into two functional parts: the magnetron is triggered by electronic emission (thermionic or field) from end shields, and the operating mode of the magnetron is provided by a main secondary-emission cathode located in the electromagnetic field interaction space. The end shields are structurally made from a set of discs, one of which, which is the triggering emitter, is made of emission-active material (oxides or alloys). The triggering emitter is placed between two discs made of heat-resistant material, one of which shields the electron stream in the interaction space of the magnetron, and the second separates the triggering emitter from the main secondary-emission cathode, thereby preventing interaction of components contained therein. In a magnetron with instant triggering, the triggering emitter consists of a combination of field-emission cathodes and activators. The activators, made of active metals or compounds, are sources of activating substances which, when adsorbed on the surface of the field-emission cathodes, increase emission capacity thereof. The emission-active materials contain barium, calcium, yttrium, thorium and lanthanum oxides or alloys of platinum or palladium with barium or iridium with lanthanum or cerium, osmium with lanthanum etc.

EFFECT: high stability of exciting a magnetron, reliability and longevity of said magnetron.

3 cl, 10 dwg