Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Plasma Physics
Volume 57, Number 12
Monday–Friday, October 29–November 2 2012; Providence, Rhode Island
Session QI3: Z-pinch, HED Magnetic Fields
3:00 PM–5:00 PM,
Wednesday, October 31, 2012
Room: Ballroom BC
Chair: Mingsheng Wei, General Atomics
Abstract ID: BAPS.2012.DPP.QI3.3
Abstract: QI3.00003 : Measurements of Rayleigh-Taylor-Induced Magnetic Fields in the Linear and Non-linear Regimes*
4:00 PM–4:30 PM
Preview Abstract Abstract
(Massachusetts Institute of Technology)
Magnetic fields are generated in plasmas by the Biermann-battery, or thermoelectric, source driven by non-collinear temperature and density gradients. The ablation front in laser-irradiated targets is susceptible to Rayleigh-Taylor (RT) growth that produces gradients capable of generating magnetic fields. Measurements of these RT-induced magnetic fields in planar foils have been made using a combination of x-ray and monoenergetic-proton radiography techniques. At a perturbation wavelength of 120 $\mu $m, proton radiographs indicate an increase of the magnetic-field strength from $\sim $1 to $\sim $10 Tesla during the linear growth phase. A characteristic change in field structure was observed later in time for irradiated foils of different initial surface perturbations. Proton radiographs show a regular cellular configuration initiated at the same time during the drive, independent of the initial foil conditions. This non-linear behavior has been experimentally investigated and the source of these characteristic features will be discussed.
*The work described here was supported in part by NLUF (DE-NA0000877), FSC/UR (415023-G), DoE (DE-FG52-09NA29553), LLE (414090-G), and LLNL (B580243).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.DPP.QI3.3
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700