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56 percent adiabatic beam expansion beam interception beam power Cathode to body cavity slow wave circuit losses cold band collector efficiency collector electrodes collector envelope coupled cavity slow dB per cavity dc cathode current efficiency enhancement efficiency of 56 electron beam electronic efficiency Figure frequency gigahertz group velocity heat dissipation Henry G Hughes Aircraft interaction impedance interception power kinetic beam energy Klystron Kosmahl larger cold bandwidth lector Lewis Research Center Litton Industries loss per cavity low loss measured megahertz multistage collector multistage depressed collector NASA NASA TN novel multistage depressed overall efficiency Performing Organization phase angle plateau field Predicted efficiency reduction radial velocity radiation cooled reduced refocusing section rf drive San Carlos schematic skin effect slow wave circuit slow wave structure space charge space communications spent beam tapered section thermal thermally insulated tion trajectories traveling wave tube Traveling-Wave Tubes tube body two-step velocity taper velocity resynchronization watts width