THEORETICAL AND EXPERIMENTAL INVESTIGATION OF LARGE-SIGNAL TRAVELING-WAVE TUBES
Abstract
A relativistic analysis of the traveling-wave amplifier has been developed both for smalland large-signal conditions. A limited number of calculations were made with the principal result being that the small-signal gain is decreased at relativistic electron velocities whereas the saturation efficiency is increased. The modulation characteristics of the S-band Crestatrons were determined by making relative phase shift measurements as a function of RF drive level, modulating voltage and frequency. Excellent agreement was obtained between calculated phase shift and measured values and over an extended range of voltage swing the phase shift varied linearly. The phase shift was nearly constant over a wide range of drive levels at low power outputs and then decreased significantly at high drive levels. A computer program to optimize efficiency by holding one electron phase-focused was developed. Extensive experimental data of UHF Crestatron No. 3 are presented; power outputs of 3-4 kw have been obtained with an octave bandwidth. The electron gun tester and analyzer was nearly completed and a limiting vacuum pressure of 6 x 1/100,000,000 mm of Hg was obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1961
- Accession Number
- AD0258867
Entities
People
- G.t. Konrad
- H.k. Detweiler
Organizations
- University of Michigan