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A Large-Signal Analysis of Beam-Type Crossed-Field Traveling-Wave Tubes


Sedin, James Walter (1958) A Large-Signal Analysis of Beam-Type Crossed-Field Traveling-Wave Tubes. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/5MN5-D881.


The equations governing the behavior of beam-type, crossed-field, traveling-wave tubes are formulated and presented. The geometry is assumed to be two-dimensional. The electron beam is treated as a number of cylinders of charge (it can be regarded as a number of layers of pencils the axes of which are parallel; these pencils can move in the two dimensions perpendicular to their axes) and space-charge forces are included by calculating the field due to these cylinders when they are placed between two perfectly conducting planes. The nonlinear equations are re-expressed in terms of normalized variables suitable for machine computation, and the procedure for solving these equations numerically is discussed. The equations are solved for a number of thin-beam, small-signal cases and the results are compared with previous analytical work. Numerical difficulties are encountered because the electric field approaches infinity in the neighborhood of a line charge. These difficulties are circumvented by a modification of the electric field in the vicinity of a line charge. Large-signal calculations are carried out for the special case of a thin sheet beam which would travel in a straight line in the absence of r-f effects. The computations are carried out for both forward- and backward-wave interaction by using several values of a space-charge parameter that cover typical operating conditions.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Electrical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Gould, Roy Walter (advisor)
  • Field, Lester M. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1958
Additional Information:Title varies in the 1958 Caltech commencement program: A Large-Signal Analysis of Beam-Type Cross-Field Traveling-Wave Tubes
Record Number:CaltechETD:etd-01132006-083726
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:152
Deposited By: Imported from ETD-db
Deposited On:13 Jan 2006
Last Modified:17 Oct 2023 21:13

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PDF (Sedin_jw_1958.pdf) - Final Version
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