Collision of two magnetized jets created by hollow ring lasers
ORAL
Abstract
In recent OMEGA laser experiments we have created narrowly collimated MG plasma jets by using 20 OMEGA beams from one hemisphere to form a hollow ring pattern on a flat CH target, and characterized the properties of these jets as a function ring radius d and target composition (pure CH vs. 2 percent Fe-doped CH). The strong MG poloidal magnetic field of these jets is created via the Biermann Battery (grad P$_{\mathrm{e\thinspace }}$\textbf{x }grad n$_{\mathrm{e}})$ mechanism by the collisions of individual laser blow offs and further compressed by the on-axis flow. The magnetic field gets stronger, more ordered and persists to greater distances from the target as d is increased from 0 to 1200 microns. Here we discuss the formation and evolution of magnetized high-beta shocks created by the collision of two such MG plasma jets, and the effects of changing the ring radius, target separation and composition. Results from 2D and 3D FLASH code simulations, and designs for future OMEGA experiments, will be presented. We will highlight the effects of electron thermal conduction on the shock structure and evolution. Potential applications of high-beta magnetized shocks to young stellar object outflows will also be discussed.
Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester, LLE rochester
Petros Tzeferacos
University of Chicago, U. Chicago, university of chicago
D.H. Froula
Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester, LLE rochester, University of Rochester, Laboratory for Laser Energetics
Chikang Li
Massachusetts Institute of Technology, MIT, university of chicago
Donald Lamb
university of chicago
R. Petrasso
Massachusetts Institute of Technology, PSFC, MIT, MIT
