Study of Resonant Loss for Helix TWTs
Abstract
One of the most effective techniques for eliminating backward wave oscillations (BWOs) in helix type traveling wave tubes (TWTs) is resonant loss. The fundamental purpose of this program was to perform experimental work which would give a more complete understanding of the electrical and mechanical characteristics of this BWO suppression scheme. In order to accomplish this, the following data were obtained: resonant frequencies for a broad range of resonator geometries, resonator materials for high Q and high loss, frequency limits, achievable peak RF power levels for tubes using this scheme, in-band effects, frequency characteristics (Q), effects of asymmetric arrangements, power handling capability, and the effects of temperature and temperature cycling. Probably the most important conclusions are two: high power, PPM focused, conduction cooled helix TWTs using resonant loss for BWO suppression are no longer limited in achievable peak RF output power due to BWO and such tubes can, for the first time since their invention, be designed solely for the desired in-band RF performance. The latter conclusion is a direct result of the fact that the in-band effects of resonant loss are minimal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1979
- Accession Number
- ADA068257
Entities
People
- C. E. Hobrecht