Self-generated magnetic fields in direct-drive implosion experiments

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

doi:10.1063/1.4883226

Title: Self-generated magnetic fields in direct-drive implosion experiments

Journal Article · Sun Jun 01 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4883226· OSTI ID:1141789

Igumenshchev, I. V. ^[1]; Zylstra, A. B. ^[2]; Li, C. K. ^[2]; Nilson, P. M. ^[1]; Goncharov, V. N. ^[1]; Petrasso, R. D. ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

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 ~10^15 W/cm^2. Proton radiographs show multiple ring-like structures produced by electric fields ~10^7 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 VTe x Vne 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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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Sponsoring Organization:: USDOE

DOE Contract Number:: NA0001944; NA0002035; NA0001857

OSTI ID:: 1141789

Report Number(s):: DOE/NA/0001944-1181; PHPAEN; 2014-23; 2148

Journal Information:: Physics of Plasmas, Vol. 21, Issue 6; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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