STUDY OF TRANSVERSE WAVE INTERACTIONS.
Triannual rept. no. 2, 1 Sep-31 Dec 66,
UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB
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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
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation