Effects of magnetic tapering and tapered tubes on long-pulse, intense e-beam GYRO-BWO microwave emission

Abstract

will be shown of the vacuum diode performance. The intense beam emitted by the diode presents unique design complications in connection with extractior of rf power. Various considerations are discussed such as the trade-offs between beam potential and kinetic energies, optimum shunt, impedance values, and advantages of discrete vs. distributed circuits. The various circuits that have been considered include conventional singlt gap designs, a distributed interaction structure, and a single gap triaxial circuit. Designs have been analyzed using analytical methods, rf codes, and particle in cell simulations. A description of the experimental hardware is given along with results of cold tests and power extraction results ~ §GPO6