Characterization of the COBRA triple-nozzle gas-puff valve using planar laser induced fluorescence

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Abstract

We present neutral density measurements of argon (Ar) injected into the 70 mm outer diameter, 24 mm axial length, outflow region of the triple-nozzle gas-puff valve fielded for gas-puff z-pinch experiments on the (1 MA, 100-200 ns) COBRA generator at Cornell University. Measurements are obtained by planar laser induced fluorescence of (λ = 266 nm, E = 80 mJ, Δt = 3 ns) frequency-quadrupled Nd:YAG laser light, absorbed by acetone dopant introduced into the Ar at 7% by pressure. Results are acquired 500μs after valve opening, the time of current initiation during z-pinch experiments. Number density plots are obtained across the Outer (O), Inner (I) and Center (C) puffs, with nozzle backing pressures {O:I:C} = {1:3:8}psia and {4:0:10}psia, delivering 'uniform' and 'hollow' profiles respectively. The total mass per unit length in these puffs is 22±0.4 μgcm-1 and 47±1 μgcm-1. Density measurement precision is ±5×1015 cm-3.

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De Grouchy, P. W. L., Rosenberg, E., Qi, N., Kusse, B. R., Kroupp, E., Fisher, A., … Hammer, D. A. (2014). Characterization of the COBRA triple-nozzle gas-puff valve using planar laser induced fluorescence. In AIP Conference Proceedings (Vol. 1639, pp. 43–46). American Institute of Physics Inc. https://doi.org/10.1063/1.4904773

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