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Electric explosions of flat Al, Тi, Ni, Cu, and Та foils with thicknesses of 1−16 μm, widths of 1−8 mm, and lengths of 5−11 mm were studied experimentally on the BIN, XP, and COBRA high-current generators at currents of 40−1000 kA and current densities of (5–50) × 108 A/cm2. The images of the exploded foils were taken at different angles to the foil surface by using point projection radiography with...
As part of the work on the Magnetized Liner Inertial Fusion (MagLIF) concept1, Awe et al. found on the 20 MA Z-machine that applying an externally generated axial magnetic field to a liner produces a helical striation pattern in the liner2. We are investigating this phenomenon using 10 mm long cylindrical metal liners having 4 mm diameter and varying wall thickness on the 1 MA, 100–230 ns COBRA pulsed...
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...
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...
Radial foil implosions on pulsed-power generators [1] can produce strongly collimated plasma jets. The typical ratio of the jet length to its radius is at least 20. These jets have large Reynolds and magnetic Reynolds numbers. Due to favorable scaling [2], they can be considered as a reasonable embodiment of collimated astrophysical plasma jets generated by protostars, planetary nebula or galactic...
Tests of the magnetized liner inertial fusion (MagLIF) concept will make use of the 27 MA Z-machine at Sandia National Laboratories, Albuquerque, to implode a cylindrical metal liner to compress and heat a preheated plasma contained within it [1]. While most pulsed power machines produce much lower currents than the Z-machine, there are questions that can still be answered on smaller scale setups...
We present investigations using a triple-nozzle, 6cm outer diameter gas puff for fast z-pinch implosions. Experiments are conducted on the 1MA, 200ns COBRA generator at Cornell University. Centimeter thickness cylindrical shells of neon/argon gas at typical densities of no ∼ 1018cm−3 are imploded onto a 4cm outer diameter inner gas shell and both subsequently converge at the pinch axis. The configuration...
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