Accession Number : AD0804091

Title :   INTERNAL TYPE O TRAVELING-WAVE TUBE ATTENUATOR PROGRAM.

Descriptive Note : Final rept. 1 Jul 63-31 May 65,

Corporate Author : HUGHES AIRCRAFT CO LOS ANGELES CA ELECTRON DYNAMICS DIV

Personal Author(s) : La France, T. S.

Report Date : 31 MAY 1965

Pagination or Media Count : 303

Abstract : The effects of the internal attenuators on the production of O type TWT's are investigated. Five Techniques for fabricating internal attenuators are evaluated. The most practical of the five techniques of applying carbon loss to helix support rods is pyrolytic carbon. Complete manufacturing information is provided in this document and under separate cover entitled Manufacture of Internal Attenuators for Helix Type Traveling-wave Tubes. The four rejected methods were vacuum evaporated carbon, pyrolytic carbon in porous ceramics, pyrolytic metal, and sprayed colloidal graphite. Two methods by which the loss pattern can be specified are presented. One makes use of a waveguide reflection coefficient and the other of an apparent surface resistivity. The two techniques relate analytically. Both methods yield to the analytical temperature correction technique derived in this report. Twenty percent changes in loss due to changes in the temperature of tube operation are found to occur. (Author)

Descriptors :   (*TRAVELING WAVE TUBES, ATTENUATORS), MANUFACTURING, TEMPERATURE, CARBON, HELIXES, PYROLYSIS, CERAMIC COATINGS, VACUUM APPARATUS, SPRAYS, PYROLYTIC GRAPHITE, GAIN, METAL COATINGS, EVAPORATION, SURFACE PROPERTIES.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE