Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth
Abstract
A direct observation of the stratified electrothermal instability on the surface of thick metal is reported. Aluminum rods coated with 70 μm Parylene-N were driven to 1 MA in 100 ns, with the metal thicker than the skin depth. Here, the dielectric coating suppressed plasma formation, enabling persistent observation of discrete azimuthally correlated stratified thermal perturbations perpendicular to the current whose wave numbers, k, grew exponentially with rate γ (k) = 0.06 ns-1 - (0.4 ns-1 μm2 ra d-2) k2 in ~ 1 g/cm3, ~ 7000 K aluminum.
- Authors:
-
- Univ. of Nevada, Reno, NV (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- University of New Mexico
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1464184
- Alternate Identifier(s):
- OSTI ID: 1437503
- Report Number(s):
- SAND-2017-7784J
Journal ID: ISSN 2470-0045; PLEEE8; 655591; TRN: US1902372
- Grant/Contract Number:
- AC04-94AL85000; NA0003525; 178661; 200269
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review E
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., and Fuelling, Stephan. Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth. United States: N. p., 2018.
Web. doi:10.1103/PhysRevE.97.053208.
Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., & Fuelling, Stephan. Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth. United States. https://doi.org/10.1103/PhysRevE.97.053208
Hutchinson, Trevor M., Awe, Thomas James, Bauer, Bruno, Yates, Kevin, Yu, Edmund P., Yelton, William G., and Fuelling, Stephan. Thu .
"Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth". United States. https://doi.org/10.1103/PhysRevE.97.053208. https://www.osti.gov/servlets/purl/1464184.
@article{osti_1464184,
title = {Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth},
author = {Hutchinson, Trevor M. and Awe, Thomas James and Bauer, Bruno and Yates, Kevin and Yu, Edmund P. and Yelton, William G. and Fuelling, Stephan},
abstractNote = {A direct observation of the stratified electrothermal instability on the surface of thick metal is reported. Aluminum rods coated with 70 μm Parylene-N were driven to 1 MA in 100 ns, with the metal thicker than the skin depth. Here, the dielectric coating suppressed plasma formation, enabling persistent observation of discrete azimuthally correlated stratified thermal perturbations perpendicular to the current whose wave numbers, k, grew exponentially with rate γ (k) = 0.06 ns-1 - (0.4 ns-1 μm2 ra d-2) k2 in ~ 1 g/cm3, ~ 7000 K aluminum.},
doi = {10.1103/PhysRevE.97.053208},
journal = {Physical Review E},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}
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Figures / Tables:
FIG. 1 : (color). Pre-shot topographical characterization of aluminum rod surfaces after electropolishing & before coating. (a) 10 kV SEM (secondary electron) image of an aluminum rod surface, 94 μm × 125 μm. The figure’s horizontal dimension is azimuthal in the experiment, and the vertical dimension is parallel to themore »
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