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DOE OSTI · 22304133

Self-generated magnetic fields in direct-drive implosion experiments

Igumenshchev, I. V.·Nilson, P. M.·Goncharov, V. N.·Zylstra, A. B.·Li, C. K.·Petrasso, R. D.
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Abstract

Electric and self-generated magnetic fields in direct-drive implosion experiments on the OMEGA Laser Facility were investigated employing radiography with ∼10- to 60-MeV protons. The experiment used plastic-shell targets with imposed surface defects (glue spots, wires, and mount stalks), which enhance self-generated fields. The fields were measured during the 1-ns laser drive with an on-target intensity ∼10{sup 15} W/cm{sup 2}. Proton radiographs show multiple ring-like structures produced by electric fields ∼10{sup 7} V/cm and fine structures from surface defects, indicating self-generated fields up to ∼3 MG. These electric and magnetic fields show good agreement with two-dimensional magnetohydrodynamic simulations when the latter include the ∇T{sub e} × ∇n{sub e} source, Nernst convection, and anisotropic resistivity. The simulations predict that self-generated fields affect heat fluxes in the conduction zone and, through this, affect the growth of local perturbations.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGYCONVECTIONHEAT FLUXIMPLOSIONSLASERSMAGNETIC FIELDSMEV RANGE 10-100PROTON RADIOGRAPHYSIMULATIONSURFACES

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Igumenshchev, I. V., Nilson, P. M., Goncharov, V. N., Zylstra, A. B., Li, C. K., Petrasso, R. D.. 2014-06-15. Self-generated magnetic fields in direct-drive implosion experiments. https://doi.org/10.1063/1.4883226

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