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An initial assessment of three-dimensional polar direct drive capsule asymmetries for implosions at the National Ignition Facility
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10.1063/1.3671972
/content/aip/journal/pop/19/1/10.1063/1.3671972
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/1/10.1063/1.3671972

Figures

Image of FIG. 1.
FIG. 1.

(Color online) World graph of the NIF chamber identifying the four polar angle rings of quad ports at roughly (1) 23°, (2) 30°, (3) 44°, and (4) 50° from the poles.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Exploding pusher capsule parameters and the temporal laser power profile. (b) The beam pointing geometry showing the polar angle of a laser beam, θ0 , the laser beam offset angle, δθ, the polar angle where the offset beam centroid intercepts the outer radius, R, of the capsule, α, and the angle of incidence of the offset beam centroid (as measured from the normal to the capsule surface), ψ, onto the target. A laser beam offset of δθ produces a radial offset, Δr, from the capsule center. The beams also can be defocused by a distance d to increase their size at the target surface.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Normalized center-of-mass position and velocity as a function of the polar angle with their respective rms values at t = 1.3 ns. (b) Poloidal % rms variations for center-of-mass position and velocity as a function of time. (c) Polar profile of the radially integrated normalized absorbed power density at t = 1.3 ns. All dashed lines correspond to old pointings given in Table I. All solid lines correspond to new pointings given in Table II. (d) Pseudocolor plot of radially integrated absorbed power density as a function of time and polar angle showing the enhanced laser absorption/imprinting at early time.

Image of FIG. 4.
FIG. 4.

(Color online) NIF capsule parameters and the temporal power profile.

Image of FIG. 5.
FIG. 5.

(Color online) Pseudocolor plot of initial absorbed power density as a function of azimuthal and polar angles for (a) clean case, (C); (b) pulled Q11T quad case with power equally distributed to the remaining seven quads in the 50° ring, (P); and (c) repointed version of (b) with only seven 50° quads, (R).

Image of FIG. 6.
FIG. 6.

(Color online) 3D Normalized pseudocolor plots of density (right half), radial speed (left half), and mesh profiles at t = 3.3 ns for (a) clean case, (C); (d) Q11T quad pulled with power equally distributed to the remaining 7 quads in 50° ring, (P); and (g) same as (d) but with remaining 7 quads repointed, (R). Side view (middle column) and top view (right column) of normalized pseudocolor surface density plots for bc) clean case, (C); (e) and (f) pull out case, (P). The bulge marks the location of the missing quad; and (h) and (i) repointed case, (R).

Image of FIG. 7.
FIG. 7.

(Color online) (a) Azimuthal rms variation (%) for center-of-mass shell position as a function of time for the three cases. (b) Azimuthal rms variation (%) for center-of-mass shell velocity as a function of time for the three cases. (c) Polar-averaged center-of-mass shell radial position in microns as a function of azimuthal angle at t = 3.3 ns for the three cases with corresponding %rms values. (d) Polar-averaged center-of-mass radial velocity in cm/s as function of azimuthal angle at t = 3.3 ns for the three cases with corresponding %rms values. (e) Azimuthally averaged (solid) and at-the-azimuthal position-of-the-dropped-quad (dashed) center-of-mass radial position in microns as a function of polar angle at t = 3.3 ns for the three cases with corresponding %rms values. (f) Azimuthally averaged (solid) and at-the-azimuthal-position-of-the dropped-quad (dashed) center-of-mass radial velocity in cm/s as a function of polar angle at t = 3.3 ns for the three cases with corresponding %rms values.

Image of FIG. 8.
FIG. 8.

(Color online) Total neutron yield as a function of time for the three cases.

Tables

Generic image for table
Table I.

Laser pointings from Ref. 47.

Generic image for table
Table II.

New laser pointings. Please note that all quads in the 44.5° ring were split in two to improve the symmetry of the implosion.

Generic image for table
Table III.

Laser pointings for backlighting study. Please note that all quads in the 44.5° ring were split in two to improve the symmetry of the implosion.

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/content/aip/journal/pop/19/1/10.1063/1.3671972
2012-01-11
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An initial assessment of three-dimensional polar direct drive capsule asymmetries for implosions at the National Ignition Facility
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/1/10.1063/1.3671972
10.1063/1.3671972
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