SMALL-SIGNAL ANALYSIS OF MONOTRONS USING A CIRCULAR CYLINDRICAL TM lmn RESONATOR
Abstract
A theoretical treatment of the small-signal aspects of the generation of microwave power by passing an electron beam axially through a circular cylindrical cavity is presented where the beam interacts with the axial component of the electric field of the transverse magnetic modes of the cavity. The most favorable conditions for oscillation occur when the transit time is such that an unmodulated electron requires approximately q + (1/4) cos n pi periods of the oscillation in traveling through the cavity. The smallsignal electronic efficiencies are computed and plotted, and under the assumption that the power dissipated within the cavity can be attributed solely to skin-effect losses in the cavity walls, the unloaded starting currents are computed. It is shown that, from the standpoint of minimizing the starting current, the best mode to employ is the TM011 mode. Further, the starting current for the TM011 mode is minimized when the ratio of cavity length to cavity diameter is 1.544.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0273781
Entities
People
- H.d. Arnett
Organizations
- United States Naval Research Laboratory