N. P. Niasse

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Summary form only given. Magnetohydrodynamic simulations provide a powerful tool for improving our understanding of the complex physical processes underlying the behaviour of wire array Z-pinches. We show how, by using a combination of high resolution 3D simulations of a single wire in an array along with lower resolution simulations of the array as a(More)
The Sphinx machine<sup>1</sup> has been used to implode cylindrical Z-pinches to produce k-shell emission from Aluminum wire arrays and Argon gas puffs. Despite the long implosion time of Sphinx driver, efficient plasma radiation sources were obtained especially with the use of multi microsecond prepulse technique for wire array loads<sup>4</sup>. However,(More)
Summary form only given. We present the results of experiments investigating the interactions of ablations streams in Aluminium and tungsten wire array z-pinches. These experiments were carried out on the 1.4MA, 240ns MAGPIE generator at Imperial College London. The primary diagnostic used for this study was an end-on aligned, two colour, Mach-Zehnder(More)
Summary form only given. Ultraviolet (UV) laser diagnostics are powerful tools for investigation of high-energy-density plasma. UV diagnostics at 266 nm were developed for investigation of dense Z-pinch plasma at the 1 MA Zebra generator. A three-channel diagnostic can be configured as two-frame shadowgraphy and interferometry or a Faraday rotation(More)
The SPHINX machine<sup>1</sup> is a 6 MA, 1 &#x03BC;s driver based on the LTD technology, used for Z-pinch experiments. The main loads are cylindrical wire arrays which appear to be, despite the long implosion time of Sphinx driver, efficient plasma radiation sources especially with the use of multi-microsecond prepulse technique. Recently, new(More)
Summary form only given. We present a study of the formation of bow shocks in radiatively cooled plasma flows. This work uses the XP generator (260kA, 145ns) at Cornell University to drive an inverse wire array. This generates a quasi-uniform, large scale hydrodynamic flow accelerated by Lorentz forces to Ma &gt; 1. This flow impacts a stationary object(More)
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. This research was sponsored by Sandia National Laboratories, Albuquerque; and the(More)
Summary form only given. We present results from magnetised bow shock experiments performed on the Magpie (~1 MA, 250 ns) pulsed-power facility. Bow shocks are formed around cylindrical conducting obstacles (diameter ~0.5 mm) positioned in a supersonic, super-Alfenic, plasma flow (M<sub>S</sub> &gt; 3, M<sub>A</sub> &gt; 2.5, V<sub>flow</sub> ~70 km/s).(More)
We report on experiments demonstrating the transition from thermally-dominated K-shell line emission to non-thermal, hot-electron-driven inner-shell emission for z pinch plasmas on the Z machine. We find preferential scaling of non-thermal line emission for atomic number Z=42 and higher (h&#x03BD; &#x2265; 17keV). Initial experiments with Mo (Z=42) and Ag(More)
Detailed knowledge of the opacity of warm, dense plasmas is critically important for many astrophysics phenomena e.g. the power output of Cepheid Variables, as well as for other radiative processes including inertial confinement fusion. We present preliminary experiments designed to measure the opacity of warm, dense plasmas (n<inf>i</inf> &#x223C;10e17(More)