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Substantial progress has been made in developing plasma radiation sources from Z-pinch implosions. University pulsed power machines provide a cost effective platform to study alternative mechanisms of producing x-rays in exploratory experiments that may provide guidance in search of further improvements on the larger machines. Radiation from puff-on-wire implosions were studied by Chuvatin et al....
The 1-MA COBRA generator at Cornell can be used for a variety of different High Energy Density plasma experiments such as single and nested wire-array z- or x-pinches, conical wire arrays for jet production and gas puff z-pinches1. In the past, it has been used extensively for investigation of wire array z-pinches. Recently, gas puff z-pinch implosion studies have been initiated on COBRA. Gas puff...
Experiments are conducted on the 16-wire aluminum Z-pinch arrays with both slow and fast risetimes wherein the initiation, ablation, implosion, and stagnation phases are compared for both soldered and unsoldered arrays. Time-dependent X-ray signals and self-emission data are measured and collected using a XUV 4-frame camera and an optical streak camera. Results show that in negative polarity, soldering...
Summary form only given. Wire array experiments utilizing four pair of 7.5 micron diameter tungsten wires spaced 244 nm apart were performed using the COBRA accelerator at Cornell University during a collaboration between Cornell University and the University of Michigan. The wire array load was driven with a 1 MV, 1 MA, 100 ns rise-time pulse; molybdenum x-pinches in the return current path were...
Summary form only given. The Cornell University COBRA pulser is a nominal 1 MA, 1 MV machine, capable of driving up to 16 wire cylindrical Z-pinches. COBRA operates normally in negative polarity, with the driving capacitors charged negative with respect to machine ground. This in turn normally establishes the polarity of the array to be negative with respect to the grounded return conductors that...
Summary form only given. When single wires are driven with short, high-current pulses the energy deposited is terminated by a voltage collapse that occurs when coronal plasma forms along the wire. It has been shown that the formation of this plasma and the amount of energy deposited can be affected by the way electrical contact is established between a wire and the electrodes. It has also been shown...
Summary form only given. The Cornell University COBRA pulser is a nominal 1 MA, 1 MV machine, capable of driving upto 8 wire cylindrical Z pinches. COBRA operates normally in negative polarity, with the driving capacitors charged negative with respect to machine ground. This in turn normally establishes the polarity of the array to be negative with respect to the grounded return conductors that are...
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