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Two Ar gas-puff experiments, each using loads consisting of two annuli and a center jet, were recently performed on Sandia National Laboratories' Z machine. These shots had the same load except that one of them (Z2603) employed a Xe dopant of 0.8% by number in the jet, which was not present in the otherwise identical Z2605. The extensive diagnostics deployed in these experiments reveal that the presence...
Magnetized Liner Inertial Fusion1 (MagLIF) is a magneto-inertial fusion concept being evaluated on the Z machine at Sandia National Laboratories. In MagLIF, first an axial magnetic field is applied to a metal cylinder filled deuterium gas, next a laser heats the deuterium gas to 100s of eV, and then the target is magnetically-imploded using the Z machine current. The axial magnetic field reduces radial...
A two-dimensional radiation MHD model that includes a self-consistent calculation for non-local thermodynamic equilibrium kinetics and ray-trace radiation transport1 is employed to simulate 65 mm diameter stainless steel double wire array Z machine experiments of 5.0 mg - shot Z1859 and 2.5 mg - shot Z1860 as well as 8 cm diameter, 2.5 mg, argon gas-puff experiments, shots Z2259 - Z2261. Temporal...
We present direct Thomson Scattering measurements of flow interpenetration and heating in the axial region of tungsten wire array z-pinches. These experiments were carried on the MAGPIE (1.4MA, 240ns) Pulsed Power generator at Imperial College London.
The Z Facility at Sandia National Laboratories consists of the Z Machine, a pulsed power driver capable of delivering 27 MA with a 100 ns risetime to a magnetically-driven load, and the Z Beamlet Laser (ZBL), which can deliver a 1 TW, 2 ns laser pulse at 532 nm to the center of the Z Machine. Magnetized Liner Inertial Fusion1 (MagLIF) is an inertial confinement fusion concept that is currently being...
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 imaging interferometer.
We have reestablished gas puff z-pinch capability on Sandia's 20 MA Z machine, including a Sandia-operated driver system and an imaging interferometer to characterize nozzle mass flow [1]. Initial experiments have focused on developing a 3 keV Ar K-shell x-ray source. We have pursued a design-driven approach to planning these experiments, utilizing numerical simulation to predict Ar K-shell yield...
A Thomson scattering diagnostic has been developed to probe plasmas produced using the MAGPIE generator (1.4MA, 240ns). The diagnostic uses a frequency doubled Nd:YAG laser delivering ∼2–4J in 8ns FWHM to the target plasma. The density and temperature of the wire array targets probed produces scattered light in the collective regime (α>1). Any bulk motion of the probed plasma Doppler shifts the...
We will present experiments on the MAGPIE facility (1.5MA, 250ns) in which an inverse wire array1 (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 (<100ns) delivered to a separate, standard imploding wire array z-pinch load. The set-up also generates...
Experimental data from gas-filled cylindrical liner z-pinch experiments is presented. The MAGPIE current (1.4 MA, 240 ns) is applied to a thin walled (80um) aluminium tube with a static gas-fill inside. The system is diagnosed axially using laser interferometry, optical streak photography and optical spectroscopy. We observe a series of cylindrically converging shock waves driven into the gas-fill...
Preliminary results of the interaction of a supersonic, radiatively cooled plasma jet with an ambient gas are presented. The experimental setup consists of a radial foil, a mum-thick aluminium disc held between two concentric electrodes and subjected to a 1.4 MA, 250-ns current pulse from the MAGPIE generator. The plasma flow, with typical velocities of ~70–90 km/s, is produced by the J × B force...
New end-on measurements have taken of the areal electron density distribution of wire array z-pinches during the ablation phase. These measurements have been used to investigate the differences in dynamics between aluminium and tungsten arrays. The experiments were carried out on the 1.4 MA peak current, 240ns rise-time MAGPIE generator at Imperial College, London. The measurements were taken using...
A Thomson scattering diagnostic has been developed to probe plasmas produced using the MAGPIE generator (1.4MA, 240ns). The diagnostic uses a frequency doubled Nd:YAG laser delivering ∼3–4J in 8ns FWHM to the target plasma. The density and temperature of the wire array targets probed produces scattered light in the collective regime (α>>1). Any bulk motion of the probed plasma Doppler shifts...
We present experimental results on the formation of supersonic, radiatively cooled jets driven by pressure due to the toroidal magnetic field generated by the 1.5 MA, 250 ns current from the MAGPIE generator. The morphology of the jet produced in the experiments is relevant to astrophysical jet scenarios in which a jet on the axis of a magnetic cavity is collimated by a toroidal magnetic field as...
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