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Ray-based calculations of backscatter in laser fusion targets
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10.1063/1.2992522
/content/aip/journal/pop/15/10/10.1063/1.2992522
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.2992522
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Plasma conditions for SRS benchmark.

Image of FIG. 2.
FIG. 2.

SRS reflectivity vs pump intensity for the SRS benchmark profile of Fig. 1. The black circles and red squares are for PF3D and DEPLETE, respectively.

Image of FIG. 3.
FIG. 3.

DEPLETE gain (black solid), NEWLIP gain (red dashed), and with no TS for (, black dots), for SRS benchmark. TS and volume bremsstrahlung noise enhance over for the smallest , while pump depletion suppresses for the larger two.

Image of FIG. 4.
FIG. 4.

SBS benchmark profile.

Image of FIG. 5.
FIG. 5.

SBS reflectivity for SBS benchmark profile. The squares are DEPLETE results, and the dashed line is an extension of the low- results.

Image of FIG. 6.
FIG. 6.

SBS DEPLETE gain (black solid), NEWLIP gain (blue dashed), and without TS for (, black dotted), for SBS benchmark profile.

Image of FIG. 7.
FIG. 7.

(a) SBS reflectivity for OMEGA experiments with CH gas fill and (described in text). Black circles are measured values, the blue solid curve is DEPLETE calculations with the nominal coupling , and the blue dashed curve is DEPLETE calculations with . (b) DEPLETE and PF3D SBS reflectivities for a similar configuration but . Black crosses are PF3D simulations, and the blue curves are the DEPLETE results as in (a).

Image of FIG. 8.
FIG. 8.

Materials and laser beam cones for the NIF example.

Image of FIG. 9.
FIG. 9.

Nominal intensity at best focus for NIF ignition design (“NIF example”), found by dividing the laser power per quad by the focal spot size. The peak intensity corresponds to /quad.

Image of FIG. 10.
FIG. 10.

DEPLETE SRS and SBS ray-averaged reflectivities for the NIF example. Solid lines are the nominal case (reabsorption and unscaled), dashed lines are the nominal but no reabsorption of scattered light , and dotted lines are with reabsorption.

Image of FIG. 11.
FIG. 11.

SRS streaked spectrum for NIF example, nominal case (, ).

Image of FIG. 12.
FIG. 12.

SBS streaked spectrum for NIF example, nominal case (, ). The white-yellow streak from occurs in the Be ablator, while the weaker feature from 12 to occurs in the gas fill.

Image of FIG. 13.
FIG. 13.

DEPLETE SRS spectrum at time for NIF example, smoothed over . The black solid and red dashed lines are computed with and without reabsorption of scattered light, respectively.

Image of FIG. 14.
FIG. 14.

(a) Laser transmission for NIF example at (peak power): black solid curve is the nominal DEPLETE solution with pump depletion, red dashed curve is with just inverse-bremsstrahlung absorption, and black dotted curve is the DEPLETE solution with . (b) SBS (blue) and SRS (red) scattered intensities for the nominal DEPLETE solution. Calculation of intensity at a given is described in text.

Image of FIG. 15.
FIG. 15.

SRS spectral density vs and , in decibels, at (peak power), for NIF example.

Image of FIG. 16.
FIG. 16.

SBS spectral density vs and , in decibels, at (peak power), for NIF example.

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/content/aip/journal/pop/15/10/10.1063/1.2992522
2008-10-10
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ray-based calculations of backscatter in laser fusion targets
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.2992522
10.1063/1.2992522
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