Laser Burnt-through Cone for the Control of Plasma Instabilities in Fast Ignition Thermonuclear Fusion Pellets
POSTER
Abstract
I propose a laser burnt-through cone for the suppression, (elimination), of plasma instabilities in fast ignition pellets.\footnote{M. Tabak, J. Hammer, M.E. Glinsky, W.L. Kruer, S. C. Wilks, J. Woodworth, E. M. Campbell, and M.D. Perry, Phys. Plasmas 1 (5), 1626 (1994).}$^,$\footnote{V. Alexander Stefan, Bulletin APS-DPP, 2006;2007.} Laser-REB, relativistic electron beam, hybrid\footnote{V. Alexander Stefan, \textit{Nonlinear Electromagnetic Radiation Plasma Interactions}, (S-U-Press, 2008).} may prove to be, (if the burnt-through laser intensity is 20{\%} of the total intensity), an effective tool for the control of variety of plasma instabilities, in particular for instabilities leading to the generation of colossal B-fields: Weibel instabilities and filamentation of the REB. In the latter case, (B-fields due to $\nabla $n x $\nabla $T mechanism), laser radiation, ($\omega _{o}$, k$_{o})$, ``breaks'' the unstable waves, k $\sim $ k$_{0}$ ($\omega _{pe}$/$\omega _{o})$, through the Kolmogorov\footnote{ A. N. Kolmogorov, Doklady Academii. Nauk SSSR, 30, 301, (1941).\par } cascades into shorter wavelengths, transferring the energy into a nonlinear Landau damping domain. The stabilization take place on the time scale $\sim $REB propagation length/ion acoustic velocity.
Authors
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V. Alexander Stefan
Institute for Advanced Physics Studies, Stefan University, La Jolla, CA 92037, Institute for Advanced Physics Studies, Stefan University, La Jolla, CA 92037.