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Results of several recent experiments with wire array Z-pinches on the MAGPIE facility (1.5 MA, 250 ns) will be presented. This will include experiments with generation of supersonic radiatively cooled plasma jets using conical and radial wire arrays. We will also present measurements of the plasma parameters in standard wire arrays and wire arrays made of coiled wires, obtained with recently implemented...
Coiled arrays, a cylindrical array in which each wire is formed into a single helix, suppress the modulation of ablation at the fundamental wavelength. Instead, ablation flow is modulated at the wavelength of the coil. Large wavelength coils produce wire beaks with sufficient axial separation that perturbations in the implosion sheath do not merge, producing an organized mode of implosion in which...
Summary form only given. A 0D circuit code is introduced to study the wire array switch concept introduced in. It has been implemented and researched at Imperial College. An exploding wire array, the switch, is in parallel with the load, an imploding wire array. Most of the current flows in the exploding array until it expands and becomes highly resistive. The 0D code contains simple models of Joule...
Summary form only given. We will present experiments on the MAGPIE facility (1.5 MA, 250 ns) in which an inverse wire array (with the wires acting as a return current cage placed around a central current conductor) operated as a fast current switch. This allowed to significantly reduce the rise-time of the current pulse (<; 100 ns) delivered to a separate, standard imploding wire array z-pinch...
Recent wire-array Z-pinch experiments performed on the MAGPIE generator at Imperial College are presented at currents up to 1.5 MA. Experiments have been conducted using a variety of array configurations, including radial wire arrays, cylindrical arrays, and coiled arrays.
Summary form only given. Experiments with the aim of studying the dynamics of a ~mum thick radial metallic foil subject to the current from the MAGPEE generator (peak current of 1 MA in 250 ns) have been performed at Imperial College. After the start of the current pulse the foil is ohmically heated and then is driven by the JtimesB force in the axial direction, which is reasonably described by 0-D...
Summary form only given. Radial wire array Z-pinches - array configurations where the wires stretch radially outwards from a central cathode - may present several advantages over cylindrical wire array Z-pinches for driving HEDP experiments. In particular, the implosion of a radial wire array results in the formation of a much smaller, yet still highly emitting, column of stagnated plasma that could...
Summary form given only. We report on detailed density measurements of the ablating plasma in wire array z-pinch experiments. Previously such measurements have been restricted to relatively early times in an experiment, where laser probing could penetrate the ablated plasma without being refracted by steep gradients. Here we show measurements made by 2 new diagnostics that compliment the earlier laser...
Summary form only given. We present detailed measurements of the implosion and X-ray emission mechanisms of radial wire array z-pinches - array configurations where the wires stretch radially outwards from a central cathode. Initially the wires ablate, then an implosion begins, starting close to the cathode where the global magnetic field is highest. Implosion continues as bubbles of plasma being...
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