Studies of Raman scattering from overdense targets irradiated by several kilojoules of 0.53 μm laser light

Drake, R. P.; Turner, R. E.; Lasinski, B. F.; Williams, E. A.; Phillion, D. W.; Estabrook, K. G.; Kruer, W. L.; Campbell, E. M.; Manes, Kenneth R.; Hildum, J. S.; Johnston, T. W.

doi:10.1063/1.866970

Cited by 55 publications

(10 citation statements)

References 49 publications

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“…Experimentally, most of these instabilities were confirmed. The main aim of the experiments was to understand the detailed mechanisms of these instabilities, since the instability levels are within the allowable ones [13][14][15][16][17][18][19][20][21][22][23][24][25]. SRS was shown to be responsible for suprathermal electrons of energies up to 150 keV; the hot electron fraction can be reduced to a level below 1 % with pump laser inten-sities of several times 10 14 W-cm" 2 for laser wavelengths shorther than 0.53 fim [17,26].…”

Section: Non-linear Interactionmentioning

confidence: 99%

Inertial confinement

et al. 1990

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The paper reviews the status of research on inertial confinement fusion (ICF) with a view to its potential as a power generation source for the future. In recent investigations on implosion physics the necessary conditions for ignition and break-even as well as the required high gain for a fusion reactor have been established quantitatively. Recent progress in the approach to the required confinement parameters and technical achievements have given confidence in the eventual realization of an ICF reactor for energy production.

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Section: Non-linear Interactionmentioning

confidence: 99%

Inertial confinement

et al. 1990

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“…The pump laser thus ought to be redirected to that direction and then refracts to lower densities, exits the plasma with a large angle of emergence to the incident direction. However, to date, only a few experiments have successfully observed strong Raman sidescattering [13][14][15][16][17][18][19]. The discrepancy between theory/simulation and experiment implies an incomplete understanding of SRSS.…”

Section: Introductionmentioning

confidence: 99%

On the stimulated Raman sidescattering in inhomogeneous plasmas: revisit of linear theory and three-dimensional particle-in-cell simulations

Xiao¹,

Zhuo²,

Yin³

et al. 2018

Plasma Phys. Control. Fusion

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Stimulated Raman sidescattering (SRSS) in inhomogeneous plasma is comprehensively revisited on both theoretical and numerical aspects due to the increasing concern of its detriments to inertial confinement fusion. Firstly, two linear mechanisms of finite beam width and collisional effects that could suppress SRSS are investigated theoretically. Thresholds for the eigenmode and wave packet in a finite-width beam are derived as a supplement to the theory proposed by Mostrom and Kaufman (1979 Phys. Rev. Lett.42 644). Collisional absorption of SRSS is efficient at high-density plasma and high-Z material, otherwise, it allows emission of sidescattering. Secondly, we have performed the first three-dimensional particle-in-cell simulations in the context of SRSS to investigate its linear and nonlinear effects. Simulation results are qualitatively agreed with the linear theory. SRSS with the maximum growth gain is excited at various densities, grows to an amplitude that is comparable with the pump laser, and evolutes to lower densities with a large angle of emergence. Competitions between SRSS and other parametric instabilities such as stimulated Raman backscattering, two-plasmon decay, and stimulated Brillouin scattering are discussed. These interaction processes are determined by gains, occurrence sites, scattering geometries of each instability, and will affect subsequent evolutions. Nonlinear effects of self-focusing and azimuthal magnetic field generation are observed to be accompanied with SRSS. In addition, it is found that SRSS is insensitive to ion motion, collision (low-Z material), and electron temperature.

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“…For intensities above lxlO 15 , the instability was saturated. The present data allow only limited discrimination among possible saturation mechanisms, but some rudimentary estimates are indicative.…”

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confidence: 95%

“…Second, the effective laser intensity may be larger than the average value as the result of the distribution of intensities across the laser spot and along the beam waist, increasing the gain. As an example, the gain was recalculated assuming that the power distribution of the interaction beam was that of a spatially incoherent beam 15 and that the gain factor saturated at 14. The result is shown as the dashed curve in Fig.…”

mentioning

confidence: 99%