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The SPHINX machine is a 6 MA, 1 μs 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 configurations have been studied : radial wire arrays to investigate the...
Summary form only given. Fast z-pinches produce intense K-shell radiation from wire arrays and for Cu arrays these photon energies can exceed 8 keV Experimental investigations of pinches on ZR using Cu arrays have already begun and more are planned for the near future. However to produce significant K-Shell emissions from moderately high atomic number plasmas such as Cu, they must be rapidly ionized...
Work on Z-pinches, that is under way at the SRC RF TRINITI, is aimed at the resolution of two basic problems: to investigate the problem of physics of X-ray generation in a Z-pinch scheme with the goal of its application for ICF at the "Angara-5-1" facility to develop the engineering aspects of multimegampere facilities intended for using them in a Z-pinch scheme for ICF and making the "Baikal"...
Summary form only given. We present experimental observations of the closure of the power feed gap on the Z machine during the implosion of a wire array load. The cathode surface and wire array edge were imaged by time-resolved laser shadowgraphy and X-ray backlighting. During the run in phase of the wire array which lasts through maximum current, ~20 MA, the radial and axial power-flow surfaces of...
Summary form only given. Linear analysis of the electromagnetic flute mode instability in the high beta current carrying plasma of the precursor has demonstrated good agreement between theory and experimental data, obtained during wire array implosion experiments on the Zebra pulsed power generator in terms of excited wavelengths and characteristic growth rates. To investigate the nonlinear stage...
Summary form only given. Dynamics of mass transport were investigated in the implosion of low number wire arrays by multiframe laser probing diagnostics. It was observed that imploding plasma "bubbles" realize a mass transport in wire arrays. In the Zebra generator, bubbles were observed in all experiments with Al, Cu, Ti, and W loads. Multiframe laser diagnostics delivered fine details...
Summary form only given. A Faraday rotation diagnostic was developed at the Nevada Terawatt Facility (NTF) for investigation of magnetic fields in plasma from 1-MA wire arrays and X-pinches. Optical diagnostics at the NTF includes a four-channel polaro-interferometer and four-frame shadowgraphy. The polaro-interferometer consists of identical shadow and Faraday channels, shearing air-wedge interferometer,...
In this paper an implosion of the wolfram wire array to the Al wire target located in the liner center axis is presented. The discharge was operated with a maximal current of 2 – 3 MA and a rise time of ∼100 ns. The Al wire of 250 µm diameter stabilized the phase of the minimum radius. The evolution of the plasma was studied by various x-ray time resolved diagnostics and the Al K-shell lines were...
Double liner implosion approach for x-ray production and distinction between gas-puff and wire array implosions are described. The test-bed for multi MJ x-ray generator «Baikal» named as “MOL” is presented.
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