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Spatially autoresonant stimulated Raman scattering in inhomogeneous plasmas in the kinetic regime
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10.1063/1.3529362
/content/aip/journal/pop/17/12/10.1063/1.3529362
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/12/10.1063/1.3529362
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Solutions to the prescribed drive Langmuir wave equation showing the growth and propagation of the Langmuir wave through a positive density gradient at different times, , 1.7, 2.5, and 3.3 ps. The relation where describes the growth of the leading edge of the Langmuir wave based on the cancellation of the kinetic nonlinear frequency shift and the shift due to the plasma inhomogeneity.

Image of FIG. 2.
FIG. 2.

The potential shown at (solid red line) and (dashed blue line) corresponding to and in Fig. 1, respectively. All parameters used to calculate other than are identical in the two cases. The potential wells are capable of trapping the phase of the Langmuir wave while and the phase is initially trapped at . The potential wells become less significant and eventually disappear as the average action increases, ending the autoresonant region in space. For clarity, has been increased by a factor of 100 for (solid red line).

Image of FIG. 3.
FIG. 3.

The plasma density with a positive density gradient (solid red line, left vertical axis) and damping window (dashed green line, right vertical axis) used in the three-wave coupling model.

Image of FIG. 4.
FIG. 4.

Solutions to the three-wave equations seeded with a single frequency of backscattered light showing the growth and propagation of the Langmuir wave through a positive density gradient at different times, , 3.4, 3.9, and 4.4 ps. The equation where describes the growth of the leading edge of the Langmuir wave based on the cancellation of the kinetic nonlinear frequency shift and the shift due to the plasma inhomogeneity.

Image of FIG. 5.
FIG. 5.

Solutions to the three-wave equations seeded with a single frequency of backscattered light showing the phase difference associated with the Langmuir wave as it propagates through a positive density gradient at different times, , 3.4, 3.9, and 4.4 ps.

Image of FIG. 6.
FIG. 6.

Solutions to the three-wave equations seeded with a broad frequency noise, showing the growth and propagation of the Langmuir wave through a positive density gradient at different times, , 1.45, and 1.67 ps.

Image of FIG. 7.
FIG. 7.

Solution at to the three-wave equations seeded with a broad frequency noise, showing the phase difference (solid red line, left vertical axis) and amplitude of the Langmuir wave (dashed blue line, right vertical axis) at this instant in time. The two distinct regions of growth are associated with constant phase, locked at values of .

Image of FIG. 8.
FIG. 8.

The reflectivity of the plasma measured at as a function of time using and seeding with a broadband noise (dashed green line) and demonstrating Rosenbluth gain saturation (Ref. 1) by using and seeding with a single frequency (solid red line).

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/content/aip/journal/pop/17/12/10.1063/1.3529362
2010-12-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spatially autoresonant stimulated Raman scattering in inhomogeneous plasmas in the kinetic regime
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/12/10.1063/1.3529362
10.1063/1.3529362
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