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The Multi-Frequency Recirculating Planar Magnetron (MFRPM) is a variant of the Recirculating Planar Magnetron (RPM), a crossed-field, high power microwave (HPM) source developed at the University of Michigan1. The MFRPM geometry offers potential advantages over traditional cylindrical cavity magnetrons, such as a large cathode area, with the added benefit of producing multiple frequencies using a...
Planar wire array (PWA) experiments were performed on Michigan Accelerator for Inductive Z-pinch Experiments, the University of Michigan’s low-impedance linear transformer driver (LTD)-driven generator ($0.1~\Omega $ , 0.5–1 MA, and 100–200 ns), for the first time. It was demonstrated that Al wire arrays [both double PWA (DPWA) and single PWA (SPWA)] can be successfully imploded at LTD generator...
The Multi-Frequency Recirculating Planar Magnetron (MFRPM) is a variant of the Recirculating Planar Magnetron, a crossed-field, high power microwave source1. The MFRPM integrates the same advantages over traditional cylindrical cavity magnetrons as UM's original RPM with the added benefit of producing multiple frequencies using a single HPM device. Previous research involved the design and fabrication...
The Multi-Frequency Recirculating Planar Magnetron (MFRPM) is a variant of the Recirculating Planar Magnetron (RPM), a crossed-field oscillator capable of producing high-power microwaves (HPM). The first multi-frequency RPM, termed the MFRPM-6+8, consists of a 6-cavity 1-GHz and 8-cavity 2-GHz set of planar cavity arrays coupled by cylindrical electron beam / RF recirculation bends. Recent experimental...
The recirculating planar magnetron (RPM) [1, 2] is a crossed-field device that combines the advantages of high-efficiency recirculating devices with those of planar devices: both large-area cathode (high current) and anode (improved thermal management). Preliminary experiments using the RPM-12a, the first L-band prototype, have successfully produced high power microwave pulses 50–300 ns in length...
Experimental, theoretical and simulation research investigations are underway on the Magneto Rayleigh-Taylor instability driven by the Mega Ampere Linear Transformer Driver at the University of Michigan. Since the Linear Transformer Driver operates at 100- kV output, inductance minimization was crucial in design of the coaxial and radial magnetically insulated transmission line that transmits power...
We use Monte Carlo simulations and analytical calculations to study the multipactor susceptibility on a dielectric with a bias DC electric field and a background gas. The DC bias is used to lower the threshold for the onset of multipactor discharge. Experiments are designed in a controlled low-pressure environment with a DC bias. Experimental data are compared with theory.
Summary form only given. Microwave windows that protect sensitive electronics from high power microwaves are important to military and civilian applications. We are testing a microwave window with crosspolarized, inter-digitized conducting strips that are biased at moderate (100's V) to high voltage (kV's) DC. The goal is to determine whether the microwave breakdown threshold can be controlled by...
Nonlinear transmission lines have been demonstrated to be an effective technique for generating high power ultrawideband or mesoband radiation without the need for a vacuum system, electron beam, or magnet. Experiments have been performed at UM on a discrete element nonlinear transmission line that uses ferrite inductors as the nonlinear element. A 100 MW driver is used to drive the experiment. Pulse...
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