Final Report on High Power Microwave Generator.
Final rept. 15 May 93-14 May 97,
TEXAS TECH UNIV LUBBOCK PULSED POWER LAB
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The purpose of this contract was to build, test and study the coaxial vircator. This work is the continuation of AFOSR Grant No. F49620-93-10203. A study of the efficiency of a coaxial virtual cathode oscillator is presented. The coaxial geometry has many physical parameters that can be changed to alter performance. These parameters include tile placement of an annulus cut in the anode base, the polarity of the system, and the variation of tile applied voltage. The annulus creates a decelerating field for the electrons and tends to keep them in tile right phased region of the virtual cathode. The annulus is varied in width and in position from the center line with the results normalized to the no annulus geometry. The results for a positively and negatively pulsed system, and the results of changing the applied voltage are also given. Comparisons of frequency, efficiency, and particle dynamics of the positively and negatively pulsed systems are given. MAGIC, a 2 l2 dimensional particle-in-cell code, and SOS a 3 dimensional particle-in cell code, are used to simulate the different geometrics.
- Radiofrequency Wave Propagation