Magnetron

A high-output type industrial magnetron comprising:

• an anode cylindrical body;
• a plurality of plate-shaped vanes each of which has one end fixed to each of a plurality of different fixing portions on an inner wall surface of the anode cylindrical body and another end extending from the fixing portion toward a central axis of the magnetron;
• and
• a predetermined number of pressure equalizing rings arranged inside the anode cylindrical body, wherein
• the plurality of plate-shaped vanes constitute a first plate-shaped vane group constituted by a set of the plate-shaped vanes arranged in every other line clockwise or counterclockwise with a plate-shaped vane at a predetermined position as a start position and a second plate-shaped vane group constituted by a set of the plate-shaped vanes excluding the first plate-shaped vane group,
• all the plate-shaped vanes belonging to the first plate-shaped vane group and all the plate-shaped vanes belonging to the second plate-shaped vane group have a same number (at least three or more) of through holes near tips in a direction of the central axis, the number being a number set, by performing a test operation in a production stage of the magnetron, to widen dissociation between a fundamental wave generated by resonance in a resonance cavity and unnecessary radiation,
• when n is a numerical value indicating an odd number starting with 1, the n-th pressure equalizing ring penetrates to come into contact with the n-th through holes of all the plate-shaped vanes belonging to the first plate-shaped vane group, and
• the (n+1)-th pressure equalizing ring penetrates to come into contact with the (n+1)-th through holes of all the plate-shaped vanes belonging to the second plate-shaped vane group.