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Magnetic priming experiments on the UM/ L-3-Titan relativistic magnetron (100 MW in L-band, -300 kV, ~3 kGauss), have shown suppression of unwanted modes and major reduction in starting currents for the pi-mode. Data from continuing experiments on magnetic priming at the cathode will be presented, as well as preliminary data on magnetic priming at the cathode and anode. Azimuthally-varying, axial-magnetic-perturbations...
Previous experiments at the University of Michigan have explored the mechanism of electron emission from triple points (vacuum-conductor-dielectric interface) for application to high current cathodes. Recent experiments have fabricated metal-oxide junction (MOJ) cathodes consisting of hafnium oxide (HfO2) coatings over metal (#304 stainless steel) substrates. High dielectric constant HfO2 coatings...
Summary form only given. Investigations of the effect of initial wire contact-resistance on wire ablation dynamics are being conducted. Experiments utilize a 120 kV, 20 kA pulser with 140 ns rise-time, which drives a two-wire z-pinch load. Diagnostics for the experiment include laser shadowgraphv, streak camera images, and time-gated ICCD visible-UV wavelength spectroscopy. Both aluminum and stainless...
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