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2.4-cm-diameter collector operating ANALYSIS OUTPUT Figure analytical and experimental Analytical Experimental beam current beam expansion beam interception charges in four-stage charges in three-stage collector electrode computed and measured computer program Computer-aided design current rays Current Recovered power Disk energy dual-mode dynamic refocusing electron beam electron-emission losses electronic efficiency experimental TWT experimentally optimized voltages four-stage collector high mode Input Output Lewis Research Center low mode MDC electrodes MDC operating condition MDC's measured collector efficiencies Multistage Depressed Collector NASA operating at experimentally operating at saturation operating condition Efficiency optimized refocusing optimized voltages Reduced percent perveance PPM stack REFOCUSING ANALYSIS OUTPUT refocusing system respect to ground RF circuit RF efficiency RF output coupler RF output power SATURATED OPERATION SATURATION AT 8.4 saturation in low secondary electron emission Secondary emission secondary-electron-emission charges secondary-electron-emission current shown in figure spent-beam energy distribution system profile THREE-STAGE COLLECTOR Traveling-Wave Tube TWT body TWT operating voltages Reduced voltage