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The MagLIK [1] concept relies on magnetic field compression to limit electron losses to the liner wall and reach fusion parameters. To measure magnetic field compression, B-dot probes could be used at the beginning of the implosions. However, this probe will fail as the magnetic field becomes large when the liner compresses. Our goal is to create a 100T field on COBRA to check B-dot probe design integrity...
The MagLIF [1] concept relies on magnetic field compression to limit electron losses to the liner wall and reach fusion parameters. To measure magnetic field compression, B-dot probes could be used at the beginning of the implosions. However, this probe will fail as the magnetic field becomes large when the liner compresses. Our goal is to measure a 100T field created on two coaxial solenoids using...
In this paper, we present investigations of 6-cm diameter Neon gas puff Z-pinch implosions. The experiments are conducted on the 1.2-MA, 200-ns COBRA generator. Several z-pinch load configurations are tested, such as neon gas puff with or without external magnetic field, and neon gas puff with a metal wire on the pinch axis (puff-on-wire).
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...
We have been investigating high energy density (HED) laboratory plasmas using radial foil configurations in order to understand basic HED plasma phenomena such as shocks. In radial foil configurations, a 5 micron thick aluminum foil is connected to the anode of a pulsed-power generator. A cathode contacts the foil at its center. This cathode is composed of a bent stainless steel pin with diameter...
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. 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...
We report on the development of a high power focussing B-applied extractor type ion diode for the 1.5 TW pulse generator KALIF. Using a Ti-Pd metal hydride film on the anode surface and diverting part of the generator current through the anode film with the help of plasma opening switches a hydrogen plasma is preformed on the anode before any voltage is applied to the diode gap. Ion efficiencies of...
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