Document Type
Dissertation
Date of Award
Fall 10-31-1979
Degree Name
Doctor of Engineering Science in Electrical Engineering
Department
Electrical Engineering
First Advisor
Gerald Martin Whitman
Second Advisor
Jacob Klapper
Third Advisor
Sol Rosenstark
Abstract
A theory and design procedure for traveling-wave tubes using cyclotron-wave interactions is developed. An analysis is presented of the energy exchange mechanism and the axial beam velocity spread induced by the r.f. interactions. The analysis of the energy spread in a realistic model of the beam with nonzero size and nonzero space-charge density shows that higher maximum efficiencies at higher power is attainable (with collector depression) in cyclotron-wave amplifiers than in synchronous-wave amplifiers.
A one-watt, and a ten-watt cyclotron-wave amplifier at 3 GHz, utilizing bifilar helix circuits, scaled from a 2 kW, 5 GHz design, were constructed. A computer was used to design a pitch taper for the circuit of the ten-watt tube to maintain synchronism between beam and circuit waves so as to enable the extraction of more energy from the beam.
In general, test results verify the theory, and indicate the possibility of attaining efficiencies of the order of 70% in a 2 kW, 5 GHz cyclotron-wave amplifier. Because of the relatively low interaction impedance available for transverse-wave interactions, it is estimated that gains of the order of 1 dB/inch are possible.
Recommended Citation
Gottfried, Arthur H., "Theory and design of cyclotron-wave traveling-wave amplifiers" (1979). Dissertations. 1251.
https://digitalcommons.njit.edu/dissertations/1251
