External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation
- Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies
We numerically model the ablation process of a 25-μm-thick aluminum foil driven by a pulsed-power machine that provides a 1-MA peak current in a 100-ns zero-to-peak rise time. The extended magnetohydrodynamics simulation is a discontinuous Galerkin code with Cartesian coordinates in 3-D and with 25-μm spatial resolution. We investigate here the influence of an external magnetic field normal to the foil surface, B z . During the foil ablation, B z = 1 T causes more nonuniform distributions of density and current compared to B z = 0 T. B z = 4 T delays the generation of surface plasma relative to the 0- and 1-T cases. The understanding of a material's ablation as it undergoes transition from the solid to plasma phases requires detailed knowledge of a material's equation of state and conductivity. This paper of warm dense matter and how instabilities propagate from a solid material to plasma motivates improvements to both numerical simulations and experimental diagnostics.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- Grant/Contract Number:
- NA0003764; NA0001836; PHY-1102471
- OSTI ID:
- 1499953
- Journal Information:
- IEEE Transactions on Plasma Science, Vol. 46, Issue 11; ISSN 0093-3813
- Publisher:
- IEEECopyright Statement
- Country of Publication:
- United States
- Language:
- English
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