Photonic Doppler Velocimetry (PDV) was used to measure the exploding surface of coated metal driven by lineal current density increasing at 3 × 1015 A/m/s. Here, aluminum-6061 rods were coated with three thicknesses (5, 17, and 41 μm) of Parylene-N and driven to 850 kA 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 surface magnetic field 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-μm-coated rods, and 17-μm-coated rods, while no evidence suggests plasma forms on 41-μm-coated metal.
Hutchinson, Trevor M., Awe, T. J., Bauer, B. S., Dolan, D. H., Pillars, J. R., Hutsel, B. T., Yu, E. P., Klemmer, A. W., & Kreher, S. E. (2020). Photonic Doppler velocimetry of ohmically exploded aluminum surfaces. Physics of Plasmas, 27(5). https://doi.org/10.1063/1.5140477
Hutchinson, Trevor M., Awe, T. J., Bauer, B. S., et al., "Photonic Doppler velocimetry of ohmically exploded aluminum surfaces," Physics of Plasmas 27, no. 5 (2020), https://doi.org/10.1063/1.5140477
@article{osti_1646556,
author = {Hutchinson, Trevor M. and Awe, T. J. and Bauer, B. S. and Dolan, D. H. and Pillars, J. R. and Hutsel, B. T. and Yu, E. P. and Klemmer, A. W. and Kreher, S. E.},
title = {Photonic Doppler velocimetry of ohmically exploded aluminum surfaces},
annote = {Photonic Doppler Velocimetry (PDV) was used to measure the exploding surface of coated metal driven by lineal current density increasing at 3 × 1015 A/m/s. Here, aluminum-6061 rods were coated with three thicknesses (5, 17, and 41 μm) of Parylene-N and driven to 850 kA 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 surface magnetic field 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-μm-coated rods, and 17-μm-coated rods, while no evidence suggests plasma forms on 41-μm-coated metal.},
doi = {10.1063/1.5140477},
url = {https://www.osti.gov/biblio/1646556},
journal = {Physics of Plasmas},
issn = {ISSN 1089-7674},
number = {5},
volume = {27},
place = {United States},
publisher = {American Institute of Physics (AIP)},
year = {2020},
month = {05}}