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Capsule performance optimization in the National Ignition Campaigna)
a)Paper NI2 1, Bull. Am. Phys. Soc. 54, 178 (2009).
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Figures

Image of FIG. 1.

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FIG. 1.

Schematic of 14 laser and target parameters is varied.

Image of FIG. 2.

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FIG. 2.

(a) Reemission sphere experimental setup with example OMEGA data. (b) of 900 eV x-ray emission from 1.4-mm-diameter reemission sphere vs inner cone fraction at 0.7 ns using 6.4-mm-long hohlraums and 100 eV drive.

Image of FIG. 3.

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FIG. 3.

First three shocks experimental setup with example OMEGA VISAR data.

Image of FIG. 4.

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FIG. 4.

Fourth rise experimental setup with example OMEGA SOP data.

Image of FIG. 5.

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FIG. 5.

Streaked capsule radiography experimental setup for NIC shots.

Image of FIG. 6.

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FIG. 6.

(a) Example of streaked 5.2 keV radiograph of a 0.42 mm inside diameter BeCu capsule driven by an OMEGA 200 eV, 2.5 ns shaped drive hohlraum. (b) Solid points are extracted peak implosion velocity vs percent ablator mass remaining from six shots using (black) and (red) initial thickness graded doped BeCu shells. Open squares are postshot Lasnex simulations.

Image of FIG. 7.

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FIG. 7.

(a) Symmetry capsule experimental setup at OMEGA. (b) 4–6 keV core x-ray images and extracted of emission shape from imploded 50 atm filled CH capsule vs inner cone fraction using NIC-relevant 270 eV peak drive.

Image of FIG. 8.

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FIG. 8.

Gated 8–10 keV x-ray images from pole and equator view of convergence CH capsules driven by 500 kJ 270 eV peak temperature NIF hohlraums.

Image of FIG. 9.

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FIG. 9.

Expected residual variances after tuning in random measurement error, systematic errors, target metrology errors, and laser diagnostic errors normalized to budget for each of the laser and target adjustable parameters.

Tables

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Table I.

Expected initial and residual post-tune offset from optimum ignition implosion performance, associated initial and post-tune offsets in optimal laser and target parameters, and required accuracy for tuning associated observables.

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/content/aip/journal/pop/17/5/10.1063/1.3298882
2010-03-04
2014-04-19

Abstract

A capsule performance optimization campaign will be conducted at the National Ignition Facility [G. H. Miller et al., Nucl. Fusion44, 228 (2004)] to substantially increase the probability of ignition by laser-driven hohlraums [J. D. Lindl et al., Phys. Plasmas11, 339 (2004)]. The campaign will experimentally correct for residual uncertainties in the implosion and hohlraum physics used in our radiation-hydrodynamic computational models before proceeding to cryogenic-layered implosions and ignition attempts. The required tuning techniques using a variety of ignition capsule surrogates have been demonstrated at the OMEGA facility under scaled hohlraum and capsule conditions relevant to the ignition design and shown to meet the required sensitivity and accuracy. In addition, a roll-up of all expected random and systematic uncertainties in setting the key ignition laser and target parameters due to residual measurement, calibration, cross-coupling, surrogacy, and scale-up errors has been derived that meets the required budget.

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Scitation: Capsule performance optimization in the National Ignition Campaigna)
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/5/10.1063/1.3298882
10.1063/1.3298882
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