Author: Peter RaminsPublisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Analytical and Experimental Performance of a Dual-mode Traveling Wave Tube and Multistage Depressed Collector
Author: Peter RaminsNASA Technical Paper
Author: Scientific and Technical Aerospace Reports
Author: NASA Scientific and Technical Publications
Author: NASA Scientific and Technical Publications
Author: Scientific and Technical Aerospace Reports
Author: Verification of Computer-aided Designs of Traveling-wave Tubes Utilizing Novel Dynamic Refocusers and Graphite Electrodes for the Multistage Depressed Collector
Author: NASA Technical Memorandum
Author: Design, Fabrication, and Performance of Brazed, Graphite Electrode, Multistage Depressed Collectors with 500-W, Continuous Wave, 4.8- to 9.6-GHz Traveling-wave Tubes
Author: Peter RaminsPublisher:
ISBN:
Category : Electrodes, Carbon
Languages : en
Pages : 24
Book Description
A small, isotropic graphite electrode, multistage depressed collector (MDC) was designed, fabricated, and evaluated in conjunction with a 500-W, continuous wave (CW), 4.8- to 9.6-GHz traveling wave tube (TWT). The carbon electrode surfaces were used to improve the TWT overall efficiency by minimizing the secondary electron emission losses in the MDC. The design and fabrication of the brazed graphite MDC assembly are described. The brazing technique, which used copper braze filler metal, is compatible with both vacuum and the more commonly available hydrogen atmosphere brazing furnaces. The TWT and graphite electrode MDC bakeout, processing, and outgassing characteristics were evaluated and found to be comparable to TWT's equipped with copper electrode MDC's. The TWT and MDC performance was optimized for broadband CW operation at saturation. The average radiofrequency (RF), overall, and MDC efficiencies were 14.9, 46.4, and 83.6 percent, respectively, across the octave operating band. A 1500-hr CW test, conducted without the use of an appendage ion pump, showed no gas buildup and excellent stability of the electrode surfaces.
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1060
Book Description