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This work presents Resistor-Capacitor-Crystal (RC-Quartz) oscillators for use as passive amplification in RF energy harvesters. Quartz crystals can provide inductive reactance with extremely high quality factor (Q). This high Q inductive reactance coupled to a capacitor can provide the needed resonance for voltage amplification with minimal in-circuit losses. Detailed theoretical analyses of the condition...
In high-power microwave diode design, the space-charge-limited current is important because of its relation to the diode impedance, and the formation of the virtual cathode. Although the Langmuir-Blodgett law, as a numerical solution, is helpful, a simple functional expression would be more convenient for practical research and the divergence of the series for large Rc/Ra would be avoided. First principle...
A numerical model of semiconducting resonant tunnelling diode (RTD) on a base of AlGaN/GaN/AlGaN double-barrier quantum structure (DBQS) with a GaN transit layer is created. The functional connections of diode impedance and admittance versus the frequency of a variable signal, parameters of the DBQS and the transit layer are received and investigated. For the diode with an identical width of 1 nm...
The operation of a double-gap S-band vircator has been investigated at submicrosecond duration of a high-current electron beam generated in a planar diode. The experiments were performed at accelerating voltages of les550 kV and diode currents of up to 17 kA using a radio-frequency cavity with a wide coupling window between its two sections. Three types of cathodes have been studied, namely, metal-dielectric,...
Summary form only given. Anode plasma formation in virtual cathode oscillator (vircator) is unavoidable because of the striking and heating of anode by intense electron beam, which affects important vircator physics issues especially the generation of high- power microwave (HPM). By theoretical and simulation methods, it is found that energy deposition which may cause serious temperature rise in anode...
Summary form only given. The Tom Martin (TM) radiographic diode comprises of a cathode ball mounted on a stalk, separated by vacuum from a flat plate metal anode target. A 2D model of this configuration, as fielded on AWE pulsed power machines, has been created using the particle in cell (PiC) code, large scale plasma (LSP). Predicted outputs have been compared to measured diagnostics in the voltage...
Summary form only given. For future hydrodynamic experiments, an 8 MV radiographic machine, IDERIX, will be developed for the CEA/PEM. This machine will be composed by ~80 super fast LTD (linear transformer driver) stages. The output voltage of each of these stages (100 kV -75 ns) will be inductively added along a ~20 m stepped magnetically insulated transmission line to deliver the power up to the...
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