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Large diameter nested wire array z-pinches imploded on the Z-generator at Sandia National Laboratories have been used to generate high intensity K-shell radiation. Previous experiments have used different materials between the inner and outer array to allow radiation emitted during the implosion and stagnation to provide some insight into the structure of the imploding plasma and the way in which...
Numerous plasma pinch devices have reported the presence of brief, intense, soft x-ray bursts from tiny regions of plasma that are variously called “bright spots,” “hot spots,” or “micropinches.” The X-pinch load geometry was originally conceived as a method to study the formation and properties of bright spots in z-pinch plasmas. X-pinch plasmas driven by 0.2 MA can form bright spots that are 0.8–1...
Summary form only given. Development of a predictive computational model for wire array z-pinches has been inhibited by the 3D nature of the dynamics. We have developed a 3D computational model for simulating cylindrical wire array z-pinches. In lieu of trying to simulate individual wires in the array from the beginning of the initiation phase, which is computationally impractical, we have incorporated...
The influence of substrate temperature, process gas, deposition pressure, and substrate type on the phase selection, orientation/epitaxy, and growth morphology of thin films in the SrNbO y (y≈3.0 or 3.5) family was investigated. Pulsed laser deposited films (from a Sr 2 Nb 2 O 7 target) obtained in both oxygen and nitrogen atmospheres upon various substrates were characterized...
Summary form only given. Understanding how the current is distributed during the implosion and stagnation of a wire array Z-pinch, and what factors may influence its distribution is vital if we are to accurately model these devices. The fraction of the drive current present in the final stagnating pinch and the proportion able to re-strike through trailing mass left behind the main implosion can directly...
Summary form only given. Compact nested tungsten wire arrays operating in current transfer mode produce peak soft x-ray powers of 200 to 250 TW on the Z accelerator. Such arrays use outer (inner) array diameters of 20 (12) mm and also employ low density, 4 to 6 mm diameter CH2 foam pulse shaping targets on the axis. These are among the highest powers produced on Z, at any array diameter. Optimized...
Summary form only given. The radiation source for Z-pinch-driven hohlraum, inertial confinement fusion (ICF) tests on the 20 MA Z facility is a single (or nested) 20-mm diameter tungsten wire array. To ensure that the scaling of these loads to higher currents are well understood, we have been investigating the behavior of these tungsten arrays. During our experiments, the wire array diameter (20 mm),...
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