Dual mode gridded gun

Details Dual mode gridded gun Dual mode gridded gun

H - Electricity

01

J

353/12

H01J 25/34 (2006.01) H01J 3/02 (2006.01) H01J 23/065 (2006.01)

Patent

CA 1063728

PATENT APPLICATION of Albert ED Berwick and George V. Miram for DUAL MODE GRIDDED GUN Abstract Travelling wave tubes designed to operate interchangeably at low power cw and high pulsed power have grids to gate the pulses and to switch the peak beam current between two values. To preserve optimum beam-focus conditions, the beam diameter should be simultaneously switched. A grid covering the central region of a concave cathode draws the low-current, small beam for cw operation of the central part of a large pulsed beam. A second grid controls added pulsed emission from the surrounding annular region of the cathode. To provide the proper ratio of beam sizes and uniform cathode loading, the cathode has radially varying radius of curvature. A hyperboloid of revolution is a good shape.

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