Photonic Doppler velocimetry of ohmically exploded aluminum surfaces
PHYSICS OF PLASMAS(2020)
摘要
Photonic Doppler Velocimetry (PDV) was used to investigate the exploding surface of coated metal driven by lineal current density increasing at 3 x 10 15 A m s. Aluminum-6061 rods were coated with three thicknesses ( 5 , 17, and 41 mu m) of Parylene-N and driven to 850kA in approximately 100 ns, with the metal thicker than the skin depth. According to PDV, the metal surface melts at 85 +/- 13 T and expands with a constant acceleration. Then, at a surface magnetic field of 140- 180 T, the metal acceleration begins to increase in time. Later, plasma forms on, and is correlated with PDV signal loss from, uncoated aluminum rods, 5- mu m-coated rods, and 17- mu m-coated rods, while no evidence suggests that plasma forms on 41- mu m-coated metal.
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