DESIGN OF A SINGLE-STAGE DEPRESSED COLLECTOR FOR HIGH-POWER, PULSED GYROKLYSTRON AMPLIFIERS

Net efficiency of microwave devices earn be enhanced by recovering ene rgy from the spent electron beam, Depressed collectors are commonly us ed for low to medium voltage (<100 kV), CW microwave tubes to achieve this objective, Designs of single-stage depressed collectors for high- power, high-voltage, pulsed gyroklystron amplifiers are presented here , Theoretical velocity distributions of the spent beams from 17.14 and 35.0 GHz relativistic gyroklystron designs are used as input to the p article trajectory simulations, The entire spent beam is collected at the cylindrical collector held at a depressed potential with respect t o the interaction cavities. The magnetic held profile is adjusted to a chieve collection of electrons at the maximum depressed value of the? collector potential, A significant improvement in the device efficienc y Is estimated for both designs. A possible implementation scheme for the energy recovery using a double anode electron gun is described in detail.