Progress toward Ignition with Noncryogenic Double-Shell Capsules

Varnum, W. S.; Delamater, N. D.; Evans, S.; Gobby, P. L.; Moore, Joyce; Wallace, Jessica; Watt, R. G.; Colvin, J. D.; Turner, R. E.; Glebov, V. Yu.; Soures, J. M.; Stoeckl, C.

doi:10.1103/physrevlett.84.5153

Cited by 56 publications

(33 citation statements)

References 9 publications

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“…The above gelatin ring experiments help shed light on feedthrough and subsequent growth at the inner surface of single-shell capsules like the ones planned for NIF 8,41 . Another class of capsules involves double-shell designs 8,42 where an inner capsule containing the fuel gas is imploded after colliding with an outer shell. To shed light on the many instabilities that can occur in double-shell capsules we have studied the possibility of double-shell gelatin rings.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

2005

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We study the linear stability of an arbitrary number N of cylindrical concentric shells undergoing a radial implosion or explosion.We derive the evolution equation for the perturbation i η at interface i; it is coupled to the two adjacent interfaces via η i ±1 . For N=2, where there is only one interface, we verify Bell's conjecture as to the form of the evolution equation for arbitrary ρ 1 and ρ 2 , the fluid densities on either side of the interface. We obtain several analytic solutions for the N=2 and 3 cases.We discuss freeze-out, a phenomenon that can occur in all three geometries (planar, cylindrical, or spherical), and "critical modes" that are stable for any implosion or explosion history and occur only in cylindrical or spherical geometries. We present numerical simulations of possible gelatin-ring experiments illustrating perturbation feedthrough from one interface to another. We also develop a simple model for the evolution of turbulent mix in cylindrical geometry and define a geometrical factor G as the ratio h cylindrical / h planar between cylindrical and planar mixing layers. We find that G is a decreasing function of o R R / , implying that in our model h cylindrical evolves faster (slower) than h planar during an implosion (explosion).

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Section: Numerical Simulationsmentioning

confidence: 99%

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

2005

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“…4 of Varnum, et al, [15]) show that targets with high convergence ratios perform poorly. The target presented here provides high gain with a fairly low convergence ratio.…”

Section: Discussionmentioning

confidence: 95%

Ignition and burn of a small magnetized fuel target

Kirkpatrick

2012

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“…For hydrodynamic instability of surface perturbations in typical HED systems, this time scale is typically one to a few nanoseconds. A particular example is the double-shell concept for the design of fuel capsules for inertial confinement fusion [16][17][18][19][20]. This scheme, employing two concentric spherical shells, adds considerable complexity to the capsule design, but inclusion of the second capsule may mitigate difficulties arising from issues such as drive asymmetry and convergence.…”

Section: Introductionmentioning

confidence: 99%

“…This scheme, employing two concentric spherical shells, adds considerable complexity to the capsule design, but inclusion of the second capsule may mitigate difficulties arising from issues such as drive asymmetry and convergence. Experiments exploring double-shell implosions using the indirect-drive approach have been carried out on virtually every generation of major pulsed laser system, starting with Shiva [21,22] and continuing through OMEGA-60 [16,23], and planned work at the NIF [24] is currently under development [20,25]. Double-shell capsules are also a possible option for the direct-drive approach [26][27][28], although preheat in this case behaves differently than with hohlraum indirect drive.…”

Section: Introductionmentioning

confidence: 99%

Evolution of surface structure in laser-preheated perturbed materials

et al. 2017

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We report an experimental and computational study investigating the effects of laser preheat on the hydrodynamic behavior of a material layer. In particular, we find that perturbation of the surface of the layer results in a complex interaction, in which the bulk of the layer develops density, pressure, and temperature structure, and in which the surface experiences instability-like behavior, including mode coupling. A uniform one-temperature preheat model is used to reproduce the experimentallyobserved behavior, and we find that this model can be used to capture the evolution of the layer, while also providing evidence of complexities in the preheat behavior. This result has important consequences for inertially-confined fusion plasmas, which can be difficult to diagnose in detail, as well as for laser hydrodynamics experiments, which generally depend on assumptions about initial conditions in order to interpret their results.

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Progress toward Ignition with Noncryogenic Double-Shell Capsules

Cited by 56 publications

References 9 publications

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

Ignition and burn of a small magnetized fuel target

Evolution of surface structure in laser-preheated perturbed materials

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