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In the past, we have produced stable z-pinch implosions with an outer Ne shell imploding on an inner Ar (Ne-on-Ar) gas puff load. Using a similar mass density profile to the Ne-on-Ar experiments, we observed that Ar-on-Ne implosions were not stable. In this paper, we present the investigations of the Ne-on-Ar and Ar-on-Ne implosion dynamics with various mass density profiles. The experiments are conducted...
The dynamics of a new type of pinches—hybrid X-pinches (HXPs)—has been studied experimentally and numerically. The initial configuration of an HXP consists of a high-current diode with conical tungsten electrodes separated by a 1- to 3-mm-long gap and shunted with a 20- to 100-μm diameter wire. It was shown earlier that a hot spot (HS) with high plasma parameters also formed in the HXP, although its...
We present investigations of gas puff Z-pinch implosions with an applied external Bz field. The experiments are conducted on the 1-MA, 200-ns COBRA generator. Stabilized 200-ns, high current z-pinch implosions have been demonstrated by using double or triple-gas puffs. In the experiments, a triple-nozzle is used to produce z-pinch loads with concentric outer, inner and center gas puff columns. Implosion...
We present a study of the formation of bow shocks in radiatively-cooled plasma flows, where a magnetic field can be introduced. This work uses the XP generator (260kA, 145ns) at Cornell University to drive an inverse wire array. A quasi-uniform, large scale hydrodynamic flow is generated and accelerated by Lorentz forces to high Mach numbers. This flow impacts a stationary object placed in its path,...
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 > 1. This flow impacts a stationary object placed in its path, forming a well-defined Mach cone. Collinear interferogram...
X-ray Thomson scattering (XRTS) has been shown to be a powerful diagnostic for the field of high energy density plasma physics and warm dense matter (WDM) research1. The stringent photometric and bandwidth requirements have historically relegated XRTS probe sources to high energy laser plasma sources or free electron lasers. Standard x-pinch configurations in which two or more fine wires cross and...
X-ray spectroscopy is an invaluable tool for diagnosing the conditions of high energy density plasmas in the laboratory. A time integrated, space-resolved spectrometer, known as the WB-FSSR1, is routinely used on the 1 MA COBRA to estimate density and temperature of the various high energy density (HED) plasmas that are produced. However, time-resolved spectroscopy is difficult to implement and has...
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