NDLI: Long term gain stability of traveling wave tubes

Content Provider	IEEE Xplore Digital Library
Author	Goebel, D.M.
Copyright Year	2000
Description	Author affiliation: Hughes Electron Dynamics, Torrance, CA, USA (Goebel, D.M.)
Abstract	Long-term gain changes in traveling wave tubes (TWT) with helix slow-wave structures have been investigated. The major variable in the gain of the TWTs is the stability of the electrical resistivity of the carbon attenuator material deposited onto the helix support rods in the tube to damp oscillations and improve input-to-output isolation. The thin carbon layers used for this purpose are deposited onto the ceramic support rods by several different techniques that produce a variability in the material structure and electrical properties. These carbon layers are susceptible to physical damage due to the environment in the tube during conditioning and long-term operation. Modification of the electrical conductivity of the layer by energetic particle bombardment and chemical erosion decreases the net RF loss in the tube and causes the gain to increase with time. It was previously reported that a modification of the carbon resistivity due to lattice damage by energetic ion bombardment in the tube produced gain increases in S-band space-TWTs of up to 10 dB in the first several hundred hours of operation. This undesirable behavior was found to be caused by impurity gases in the tube from poorly cleaned parts. Proper cleaning of these parts eliminated the large gain changes during early life operation of these tubes.
File Size	96230
File Format	PDF
ISBN	0780359879
DOI	10.1109/OVE:EC.2000.847416
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stability Organic materials Conductivity Gain Electric resistance Attenuators Ceramics Structural rods Conducting materials Chemicals
Content Type	Text
Resource Type	Article

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