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Efficiency enhancement of octave-bandwidth traveling wave tubes by use of multistage depressed collectorsSmall, three- and five-stage depressed collectors were evaluated in conjunction with a 4.8- to 9.6-GHz TWT of 325- to 675-W power output and a beam of 0.5 microperv. The multistage depressed collector (MDC) performed well even though its design had been optimized for a TWT of identical design but considerably less output power. Despite large, fixed losses significant efficiency enhancement was demonstrated with both the three- and five-stage depressed collectors. At saturated rf power output, the improvement in the overall efficiency ranged from a factor of 2.5 to 3.0 for the three-stage collector and a factor of 3.0 to 3.5 for the five-stage collector. At saturation three-stage collector efficiencies of 77 to 80 percent and five-stage collector efficiencies of 81 to 84 percent were obtained across the frequency band. An overall efficiency of 37.0 to 44.3 percent across the frequency band of 4.8 to 9.6 GHz was demonstrated with the use of harmonic injection. For operation below saturation, even larger relative improvements in the overall TWT efficiency were demonstrated. Collector performance was relatively insensitive to the degree of regulation of the collector power supply.
Document ID
19790008968
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Ramins, P. (NASA Lewis Research Center Cleveland, OH, United States)
Fox, T. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1979
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
NASA-TP-1416
E-9749
Accession Number
79N17139
Funding Number(s)
PROJECT: RTOP 506-20
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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