scholarly journals Indirect-drive noncryogenic double-shell ignition targets for the National Ignition Facility: Design and analysis

2002 ◽  
Vol 9 (5) ◽  
pp. 2221-2233 ◽  
Author(s):  
Peter Amendt ◽  
J. D. Colvin ◽  
R. E. Tipton ◽  
D. E. Hinkel ◽  
M. J. Edwards ◽  
...  
Keyword(s):  
Facility Design ◽  
National Ignition Facility ◽  
Indirect Drive

Three dimensional low-mode areal-density non-uniformities in indirect-drive implosions at the National Ignition Facility

2021 ◽  
Vol 28 (4) ◽  
pp. 042708
Author(s):  
D. T. Casey ◽  
O. L. Landen ◽  
E. Hartouni ◽  
R. M. Bionta ◽  
K. D. Hahn ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Areal Density ◽  
National Ignition Facility ◽  
Indirect Drive

scholarly journals Capsule design for the National Ignition Facility

1999 ◽  
Vol 17 (2) ◽  
pp. 217-224 ◽  
Author(s):  
T.R. DITTRICH ◽  
S.W. HAAN ◽  
M.M. MARINAK ◽  
D.E. HINKEL ◽  
S.M. POLLAINE ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Three Dimensions ◽  
Initial Surface ◽  
National Ignition Facility ◽  
X Ray ◽  
Ongoing Effort ◽  
Surface Finishes ◽  
Material Homogeneity ◽  
Indirect Drive ◽  
Reduced Scale

Several choices exist in the design and production of capsules intended to ignite and propagate fusion burn of the deuterium–tritium (D–T) fuel when imploded by indirect drive at the National Ignition Facility (NIF). These choices include ablator material, ablator dopant concentration and distribution, capsule dimensions, and X-ray drive profile (shock timings and strengths). The choice of ablator material must also include fabrication and material characteristics, such as attainable surface finishes, permeability, strength, transparency to radio frequency and infrared radiation, thermal conductivity, and material homogeneity. Understanding the advantages and/or limitations of these choices is an ongoing effort for LLNL and LANL designers. At this time, simulations in one-, two-, and three-dimensions show that capsules with either a copper-doped beryllium or a polyimide (C22H10N2O4) ablator material have both the least sensitivity to initial surface roughnesses and favorable fabrication qualities. Simulations also indicate the existence of capsule designs based on these ablator materials which ignite and burn when imploded by less than nominal laser performance (900-kJ energy, 250-TW power, producing 250-eV peak radiation temperature). We will describe and compare these reduced-scale capsules, in addition to several designs which use the expected 300-eV peak X-ray drive obtained from operating the NIF laser at 1.3 MJ and 500 TW.

scholarly journals High-Performance Indirect-Drive Cryogenic Implosions at High Adiabat on the National Ignition Facility

2018 ◽  
Vol 121 (13) ◽  
Author(s):  
K. L. Baker ◽  
C. A. Thomas ◽  
D. T. Casey ◽  
S. Khan ◽  
B. K. Spears ◽  
...  
Keyword(s):  
High Performance ◽  
National Ignition Facility ◽  
Indirect Drive

scholarly journals Direct drive double shell target implosion hydrodynamics on OMEGA

2005 ◽  
Vol 23 (2) ◽  
pp. 187-192 ◽  
Author(s):  
GEORGE A. KYRALA ◽  
NORMAN DELAMATER ◽  
DOUGLAS WILSON ◽  
JOYCE GUZIK ◽  
DON HAYNES ◽  
...  
Keyword(s):  
Time History ◽  
Direct Drive ◽  
National Ignition Facility ◽  
Initial Stage ◽  
Heat Effects ◽  
Measured Time ◽  
History Of ◽  
Indirect Drive ◽  
Omega Laser ◽  
And Performance

Imploding indirect-drive double shell targets may provide an alternative, non-cryogenic path to ignition at the National Ignition Facility (NIF). Experiments are being pursued at OMEGA to understand the hydrodynamics of these implosions and the possibility of scaling it to the NIF design. We have used 40 beams from the OMEGA laser to directly drive the capsules, and we have used the remaining 20 beams to backlight the imploding shells from two different directions at multiple times. We will review the recent experiments to measure the hydrodynamics of the targets using two-view X-ray radiography of the capsules. We will present data on measured yields from the targets. We will present a measured time history of the hydrodynamics of the implosion. Experiments were pursued using direct drive in which the M-band effect (experienced in the indirect drive experiments) could be eliminated or controlled. It was learned in the direct drive experiments that the best performing capsules were those that had a thin outer layer of gold. This effectively causes M-band pre-heat effects giving implosion hydrodynamics and performance closer to the indirect drive case. We will review the methods used to radiograph the targets and the techniques used to extract useful information to compare with calculations. The effect of imperfections in the target construction will be shown to be minimal during the initial stage of implosion. The yields from the targets were observed to be uniformly low compared to indirect-drive.

scholarly journals Self-Generated Magnetic Fields in the Stagnation Phase of Indirect-Drive Implosions on the National Ignition Facility

2017 ◽  
Vol 118 (15) ◽  
Author(s):  
C. A. Walsh ◽  
J. P. Chittenden ◽  
K. McGlinchey ◽  
N. P. L. Niasse ◽  
B. D. Appelbe
Keyword(s):  
Magnetic Fields ◽  
National Ignition Facility ◽  
Indirect Drive

scholarly journals Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility

2017 ◽  
Vol 140 (4) ◽  
Author(s):  
Ping Wang ◽  
Kumar S. Raman ◽  
Stephan A. MacLaren ◽  
Channing M. Huntington ◽  
Sabrina R. Nagel ◽  
...  
Keyword(s):  
Energy Density ◽  
Hydrodynamic Instability ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Density ◽  
Fluid Interface ◽  
National Ignition Facility ◽  
X Ray Imaging ◽  
Indirect Drive ◽  
Instability Growth

We present simulations of a new experimental platform at the National Ignition Facility (NIF) for studying the hydrodynamic instability growth of a high-energy density (HED) fluid interface that undergoes multiple shocks, i.e., is “reshocked.” In these experiments, indirect-drive laser cavities drive strong shocks through an initially solid, planar interface between a high-density plastic and low-density foam, in either one or both directions. The first shock turns the system into an unstable fluid interface with the premachined initial condition that then grows via the Richtmyer–Meshkov and Rayleigh–Taylor instabilities. Backlit X-ray imaging is used to visualize the instability growth at different times. Our main result is that this new HED reshock platform is established and that the initial data confirm the experiment operates in a hydrodynamic regime similar to what simulations predict. The simulations also reveal new types of edge effects that can disturb the experiment at late times and suggest ways to mitigate them.

scholarly journals Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility

2017 ◽  
Vol 24 (10) ◽  
pp. 102707 ◽  
Author(s):  
D. A. Martinez ◽  
V. A. Smalyuk ◽  
A. G. MacPhee ◽  
J. Milovich ◽  
D. T. Casey ◽  
...  
Keyword(s):  
National Ignition Facility ◽  
Support Strategies ◽  
Indirect Drive ◽  
Instability Growth
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