Experimental observation of the stratified electrothermal instability on aluminum with thickness greater than a skin depth.
basic_science · Level V
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- Record sourced from PubMed, PMID 29906862.
- Also identified by DOI 10.1103/PhysRevE.97.053208.
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Abstract
A direct observation of the stratified electrothermal instability on the surface of thick metal is reported. Aluminum rods coated with 70μm Parylene-N were driven to 1 MA in 100ns, with the metal thicker than the skin depth. 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)=0.06ns^{-1}-(0.4ns^{-1}μm^{2}rad^{-2})k^{2} in ∼1g/cm^{3}, ∼7000K aluminum.