Air cooled coaxial magnetron having an improved arrangement of cooling fins

Claim 1

In an air cooled magnetron tube, means forming an anode electrode having a wave circuit portion for supporting wave energy thereon, means forming a cathode electrode substantially concentrically disposed of said anode in spaced relation from said anode wave circuit portion thereof to define an annular cross field interaction region in the space between said anode and said cathode electrodes, said anode electrode including a circular cavity resonator dimensioned to support a circular electric mode of resonance at substantially the operating frequency of the tube, said anode also including a generally cylindrical wall portion having an array of axially directed coupling slots therethrough providing wave energy communication between said anode wave circuit portion and said cavity resonator for locking the operating frequency of the wave energy on the anode wave circuit to the operating frequency of said cavity resonator, The Improvement Comprising, means forming an inner thermally conductive heat shunt structure connected in thermal conductive relation to one end of said cylindrical anode wall and extending axially of the tube for conducting thermal energy from said anode wall axially of the tube, means forming an array of relatively thin closely spaced thermally conductive cooling fins affixed at one edge to said inner heat shunt and extending radially outwardly therefrom, said fins being disposed with the plane of said fins generally transverse to the longitudinal axis of the tube, means forming a thermally conductive radially directed heat shunt connected to said inner heat shunt and extending radially outwardly therefrom, and means forming a thermally conductive outer axially directed heat shunt interconnecting the outer ends of said cooling fins and said radial heat shunt for enhancing thermal conduction from said anode wall to said cooling fins for improved cooling efficIency of the tube.