Accession Number : AD0655002

Title :   STUDY OF TRANSVERSE WAVE INTERACTIONS.

Descriptive Note : Triannual rept. no. 2, 1 Sep-31 Dec 66,

Corporate Author : UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB

Personal Author(s) : Schriever,R. L. ; Johnson,C. C. ; Grow,R. W.

Report Date : JUL 1967

Pagination or Media Count : 63

Abstract : The purpose of this project is to evaluate analytically and experimentally the interaction between a rotating electron beam and wave guide fields. The methods of analysis include use of a general coupled-mode theory, a ballistic computer program, and an experimental evaluation. An analysis of possible beam-flow patterns has been carried out by choosing some parameters and then numerically solving the equations for the resulting beam-flow characteristics. The interaction effect of multiple beams in the circuit has been considered by extending the coupled-mode theory to the multiple-beam case. The results of electron velocity spread have been investigated experimentally by modification of the device which results in a beam with higher velocity spread. The beam-flow analysis gives the properties of a proposed type of beam for use in a rotating beam interation. The multiple-beam interaction analysis indicates that the effect of multiple beams is a reduction in interaction strength which corresponds to the spatial variation of the wave guide fields. Axial velocity spread is found to seriously reduce the interaction strength. The beam-flow analysis and multiple-beam interaction suggest that the best approach to beam launching is to optimize the rotation of individual electrons rather than try to use a beam of the ideal form. Device interaction reveals that a beam-forming electrode in the gun will reduce the axial velocity spread and significantly improve the interaction strength. (Author)

Descriptors :   (*ELECTRON BEAMS, ELECTROMAGNETIC FIELDS), INTERACTIONS, WAVEGUIDES, ROTATION, CYCLOTRON WAVES, MICROWAVE AMPLIFIERS

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE