Design and performance verification of advanced multistage depressed collectors

Author

Kosmahl, H. ; Ramins, P.

Author_Institution

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio

Volume

21

fYear

1975

fDate

1975

Firstpage

267

Lastpage

268

Abstract

In a joint USAF-NASA Program, Lewis Research Center is carrying out an efficiency improvement program on TWTs for use in ECMs by applying multistage depressed collector (MDC) and spent beam refocusing techniques developed at Lewis. In the analytic part of the effort, 3-D electron trajectories are used throughout the 10-18% (electronic) efficient, 4.8-9.6GHz bandwidth, 400-600 W CW TWT, the spent beam re-focuser and the depressed collector. Collector efficiency, collector losses and overall efficiency are identified and computed. On the experimental side, tube performance is evaluated first without the MDC, then the spent beam is analyzed for symmetry, circularity and the velocity spread. Finally, the MDC is attached and its performance optimized and evaluated. Theory predicts a MDC-efficiency of 84% for a 4 stage, $3$ size MDC which can be achieved with symmetric and circular beams.

Keywords

Apertures; Electric variables measurement; Electrodes; Guns; Loss measurement; Magnetic field measurement; Power measurement; Radio frequency; Space charge; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices Meeting, 1975 International

Type

conf

DOI

10.1109/IEDM.1975.188876

Filename

1478237