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- W103671109 abstract "Plasma wave wakes, which are the collective oscillatory response near the plasma frequency to the propagation of particles or electromagnetic waves through a plasma, play a critical role in many plasma processes. New results from backwards stimulated Raman scattering (BSRS), in which wakes with phase velocities much less than the speed of light are induced by the beating of counter-propagating light waves, and from electron beam stopping, in which the wakes are produced by the motion of relativistically propagating electrons through the dense plasma, are discussed. Both processes play important roles in Inertial Confinement Fusion (ICF). In BSRS, laser light is scattered backwards out of the plasma, decreasing the energy available to compress the ICF capsule and affecting the symmetry of where the laser energy hits the hohlraum wall in indirect drive ICF. The plasma wave wake can also generate superthermal electrons that can preheat the core and/or the ablator. Electron beam stopping plays a critical role in the Fast Ignition (FI) ICF concept, in which a beam of relativistic electrons is used to heat the target core to ignition temperatures after the compression stage. The beam stopping power determines the effectiveness of the heating process. This dissertation covers new discoveries on the importance of plasma wave wakes in both BSRS and electron beam stopping.In the SRS studies, 1D particle-in-cell (PIC) simulations using OSIRIS are performed, which model a short-duration (~500/o 4× 10 -3 ), the peak stopping power averaged over the electrons is (1 ± 3) × 10 3 times that of an uncorrelated electron. These results indicate that an enhanced energy-independent or weakly dependent correlated stopping may occur for Fast Ignition scenarios, even for interparticle spacings when discreteness effects are important. The dependence of correlation effects on beam electron separation in terms of c/&omegape also indicates that Fast Ignition may be possible with core densities below those designed using single-electron stopping powers. Target optimization to exploit correlated stopping in the target core may be possible once the effects of angular spread and energy spread are understood. Furthermore, this work begins to allow a connection from the discrete wakes effect to collective instabilities as the interparticle spacing is decreased relative to the size of the wake due to the use of denser beams, lower plasma densities, and the filamentation/self-focusing of the beam." @default.
- W103671109 created "2016-06-24" @default.
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- W103671109 date "2014-01-01" @default.
- W103671109 modified "2023-09-27" @default.
- W103671109 title "Wakes in Inertial Fusion Plasmas" @default.
- W103671109 hasPublicationYear "2014" @default.
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