Some investigations into the properties of a double-stream, microwave amplifier

by George Bekefi

Institution: McGill University
Department: Department of Physics.
Degree: MS.
Year: 1950
Keywords: Physics.
Record ID: 1503283
Full text PDF: http://digitool.library.mcgill.ca/thesisfile122619.pdf


The original theory of J.R. Pierce and A.V. Haeff pertaining to the problem of the existence of waves within a narrow beam of electrons of two different average velocities, is discussed. The theory is then extended to the case of wide beams separated by a finite distance. A special case of this theory is then considered, that of a wide pencil of two superimposed streams and the variation of signal amplification that may occur under suitable conditions is studied, as a function of beam width. The results indicate considerable discrepancies between the two theories in cases of narrow beams. As the width increases, however, the two cases tend asymptotically to a common value.