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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...
Radiative losses are known to play an important role in the development of hydrodynamic instabilities in many astrophysical (Core-collapse supernovae; HH objects) and laboratory (Inertial confinement fusion) environments. The fielding of triple-annular gas-puff valves on university level pulsed-power generators [1][2] enables study of these instabilities in carefully controlled environments, for inviscid...
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...
Streak cameras operate by scanning an image present on the photocathode across a recording device such as a film. Traditional operation preprocesses that image with a slit aperture. This slit is made as narrow as possible to improve the time resolution i.e. so as to minimize the overlap of optical data on the film from one moment to the next. This has the advantage of greatly simplifying the interpretation...
Summary form only given. A standard X pinch consists of two or more fine wires that cross at a single point as the load of a 200-500 kA pulsed power generator. At the MA current level, multi-wire, multilayer and solid conical X pinches have been proposed and tested. To simplify the X pinch load while retaining the favorable properties of the fine wire loads achieved at the 200-500 kA level, a hybrid...
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