Accession Number : AD0698351

Title :   DESIGN, DEVELOP, AND FABRICATE A MECHANICALLY TUNABLE, POSITIVELY PULSED GROUNDED CATHODE MAGNETRON,

Descriptive Note : Final rept. 15 Jun 68-15 Jul 69,

Corporate Author : MICROWAVE ASSOCIATES INC BURLINGTON MASS

Personal Author(s) : Briggs,Richard S.

Report Date : 15 AUG 1969

Pagination or Media Count : 43

Abstract : The general features of the tube design were: low power, small size, positive pulse, and tunability. A rising sun anode in preference to strapped or coaxial anodes was used to provide the electrical and mechanical requirements for operation at 36 GHz. Problems were encountered with tooling and frequency control. A replaceable cathode design featuring a Philips dispenser type was used. Larger diameter cathodes were used in later tubes to provide improved operation. The output system consiting of a transformer, window, and output flange was evolved to meet mechanical and electrical requirements. Problems were encountered with accurate cold tests and with parameters required for optimum coupling. The inductive internal tuner was modified to reduce losses. Tuning settability to within 2 MHz was provided. The use of Alnico 9 magnets provided a compact, lightweight design. Assembly techniques and processing procedures were evolved, such as cathode centering, cathode replacement, pulse aging with a Vac-Ion pump, and magnet charging. A ruggedized magnetron package was evolved. Test results of five magnetrons were evaluated and related to work done with the output system, tuner, frequency range, cathode, and V-I characteristic. The MA 275 program provided, in addition to usable tubes, a prototype design for the manufacture of small, low power, tunable magnetrons in the 36 MHz regions. (Author)

Descriptors :   (*MAGNETRONS, SUPERHIGH FREQUENCY), TUNING DEVICES, DESIGN, MANUFACTURING

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE