Fundamental studies on the electrothermal instability on the 1 MA Mykonos driver
Abstract not provided.
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Jump to search filtersUsing engineered defects to understand the seed for instabilities in current-driven metal
Abstract not provided.
Use of hydrodynamic theory to estimate electrical current redistribution in metals
Physics of Plasmas
Using the analogy between hydrodynamic and electrical current flow, we study how electrical current density j redistributes and amplifies due to two commonly encountered inhomogeneities in metals. First, we consider flow around a spherical resistive inclusion and find significant j amplification, independent of inclusion size. Hence, even μm-scale inclusions can affect performance in applications by creating localized regions of enhanced Joule heating. Next, we investigate j redistribution due to surface roughness, idealized as a sinusoidal perturbation with amplitude A and wavelength λ. Theory predicts that j amplification is determined by the ratio A/λ, so that even "smooth"surface finishes (i.e., small A) can generate significant amplification, if λ is correspondingly small. We compare theory with magnetohydrodynamic simulation to illustrate both the utility and limitations of the steady-state theory.
Three-dimensional metal deformation and plasma formation driven by resistive inclusions
Abstract not provided.
Diagnostics to study electrothermal instabilities on Mykonos
Abstract not provided.
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