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Kinetic enhancement of Raman backscatter, and electron acoustic Thomson scatter
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View: Figures


Image of FIG. 1.
FIG. 1.

1D geometry of the ELVIS code.

Image of FIG. 2.
FIG. 2.

Time-averaged reflectivity and bounce number for Trident parameters described in text. Asterisks are simulation . The solid curve is the coupled-mode steady-state from Eq. (8), and the dashed curve is from Eq. (11); both include pump depletion.

Image of FIG. 3.
FIG. 3.

Instantaneous reflectivity for Trident run.

Image of FIG. 4.
FIG. 4.

(Color) (a) Time-resolved and (b) time-integrated spectrum of reflected light for Trident run. (, ) are the imposed (pump, seed) frequency. The spectrum of a field in “power dB” is . The EAS asterisk in (b) is at .

Image of FIG. 5.
FIG. 5.

(Color) Envelope (rms) of electrostatic field for Trident run over the domain between the damping regions.

Image of FIG. 6.
FIG. 6.

(Color) Power spectrum of over the domain of Fig. 5 for Trident parameters run. The “EPW” curve is the EPW for the initial Maxwellian, and the “Stokes” curve is defined in the text. The “EAS” point at is phase-matched with the EAS asterisk in Fig. 4(b). Panels (b) and (c) are zooms of the SRBS and EAW regions of panel (a).

Image of FIG. 7.
FIG. 7.

(Color online) space- and time-averaged over and for Trident run. Panels (a) and (b) are, respectively, for all times and , . is the phase velocity of the EPW driven by the beating of the pump and seed light waves. .

Image of FIG. 8.
FIG. 8.

(solid) and its Gauss-Hermite projection (dotted) for from Fig. 7 at . Projection parameters given in text.

Image of FIG. 9.
FIG. 9.

Zero contours of the electrostatic dispersion relation for , computed from as projected in Fig. 8.

Image of FIG. 10.
FIG. 10.

Electrostatic linear modes from the projection in Fig. 8. “EPW” indicates the EPW for the initial Maxwellian.

Image of FIG. 11.
FIG. 11.

(Color) Roots from Fig. 10 overlaid on for and the domain of Fig. 6. The white and blue circles are possible phase-matched daughter BAMs and EAWs, respectively, for beam acoustic decay of a parent BAM1 root with .

Image of FIG. 12.
FIG. 12.

(Color online) Bispectrum for at for Trident run. The asterisk marks the seeded linear SRBS point. along the dominant diagonal streak.

Image of FIG. 13.
FIG. 13.

(a) Bispectrum and (b) bicoherence from Fig. 12 along the line for decay of the pump laser.

Image of FIG. 14.
FIG. 14.

(a) Bispectrum and (b) bicoherence of Fourier modes , 0.209, and 0.136 for , over in the Trident run. . The peak in and shows parametric coupling in the BAD process.

Image of FIG. 15.
FIG. 15.

Same as Fig. 2 but for the hohlraum conditions described in the text.

Image of FIG. 16.
FIG. 16.

(Color) (a) Time-resolved spectrum of reflected light for hohlraum run. labels the peak of the EAS spectrum, and “re-scat” indicates Raman rescatter of SRBS in its own forward direction. (b) Power spectrum of over the domain inside the damping regions. The stars are Stokes points for EAS with scattered light of and 2.69.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Kinetic enhancement of Raman backscatter, and electron acoustic Thomson scatter