High Efficiency Octave Bandwidth Traveling-Wave Tube.
Technical rept. May-Dec 71,
HUGHES AIRCRAFT CO TORRANCE CA ELECTRON DYNAMICS DIV
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Techniques resulting in high overall efficiency over extended bandwidths have been considered in the initial phase of this study effort. Some of the techniques have been pursued during previous efficiency studies in which high efficiencies have been demonstrated on low duty pulsed traveling-wave tubes. The present study is complicated by both the high average power requirement and the dual mode capacity to be afforded by the resulting experimental tube. Experimental cold testing dealing with helices of different pitch has been performed. Suitable shaping methods have resulted in high interaction impedances with small phase velocity variations over octave bandwidths. Large signal computer evaluations considering beam-circuit wave velocity resynchronization schemes have been conducted. In the initial phase various velocity taper geometries were considered. Later in the program voltage jump and combination velocity taper-voltage jump velocity resynchronization designs will be investigated. It is planned to incorporate a multi-stage depressed collector to further improve the efficiency by recovering a portion of the spent electron beam energy. Theoretical design studies using three different computer programs for the multistage collector have been initiated. Several iterations will be required before the electrical design can be finalized. Author
- Electrical and Electronic Equipment