Role of shocks and mix caused by capsule defects

Abstract

Invited Article: Relation between electric and magnetic field structures and their proton-beam images Rev. Sci. Instrum. 83, 101301 (2012) Low intensity dust ion-acoustic shock waves due to dust charge fluctuation in a nonextensive dusty plasma Phys. Plasmas 19, 083705 (2012) Experimental and computational study of complex shockwave dynamics in laser ablation plumes in argon atmosphere Phys. Plasmas 19, 083504 (2012) Additional information on Phys. Plasmas An Eulerian code with a turbulent mix model is used to model a set of plastic (CH) ablator capsules with and without equatorial grooves. The "perfect" capsule results were used to calibrate simulations of capsules with equatorial grooves of different depths that provided information on increasingly perturbed implosions. Simulations with a turbulence model were able to calculate the same yield over mix (YOM) ratio (experiment/mix simulation) of 0.2 to 0.3 for thin (8-lm thick) and thick shell (15-lm thick) capsules with no grooves and thin capsules with shallow grooves. When the capsules have deep grooves, the YOM ratio increases to greater than unity, probably because the deformed shocks focus too strongly on the symmetry axis in our two-dimensional simulations. This is supported by a comparison of simulated and experimental x-ray images. V C 2012 American Institute of Physics. [http://dx.

Analysis of mix experiments on Omega

“…The capsules fired in September 2010 were stored at -80C for about a year, and something about this storage caused the capsules to behave differently, but there is not enough information to determine the exact cause [12]. However, we are able to match the delayed bang times by reducing the energy source by 25%.…”

X-ray spectroscopic diagnostics and modeling of polar-drive implosion experiments on the National Ignition Facility

“…Fig. 8 displays the comparison between radial profiles of electron number density as calculated by the rad hydro code from its internal equation-of-state (EOS) model 13 and by the ATOMIC code using a self-consistent, multi-element mix capability 37 during the post-processing. As expected, the two traces agree very well in the regions occupied only by the light elements (H in the core; C and D in the undoped plastic), which are at or near full ionization due to electron temperature values that are no less than 200 eV.…”

Asymmetric directly driven capsule implosions: Modeling and experiments—A requirement for the National Ignition Facility

“…15 It lacks, however, laser beam and laser energy deposition physics. Seka measured $70% absorption (Fig.…”