Experimental Approach to Interaction Physics Challenges of the Shock Ignition Scheme Using Short Pulse Lasers

Goyon, C.; Depierreux, S.; Yahia, Vincent; Loisel, Guillaume; Baccou, C.; Courvoisier, C.; Борисенко, Н. Г.; Orekhov, A. S.; Rosmej, O.; Labaune, C.

doi:10.1103/physrevlett.111.235006

Cited by 18 publications

(15 citation statements)

References 33 publications

(28 reference statements)

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“…The foam begins transmitting at t ¼ (0.7 6 0.1) ns when the ionization front breaks through, giving a mean ionization velocity of (4.0 6 0.6) 10 2 lm/ns, in agreement with previous theoretical modelling 23 and experiments. 12,24 The instantaneous transmission rate is higher than 60% at t ¼ 1 ns and increases to almost 100% at the end of the pulse, corresponding to a mean intensity of 2 Â 10 14 W/cm 2 . Let us now compare the intensity distribution of the PII-beam and that from the RPP-beam.…”

Section: A Experimental Resultsmentioning

confidence: 98%

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

et al. 2015

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Plasma induced incoherence (PII) can strongly modify the growth rates of stimulated scattering instabilities. A special double-target design was used to quantify the effect of PII on stimulated Brillouin scattering (SBS). Successive shots using all or part of these targets led to the characterization of temporal and spatial incoherence of a laser pulse after propagation through a foam plasma and to the quantification of the reduction of SBS from the second target. Numerical simulations were used to identify the main physical mechanisms in play. V C 2015 AIP Publishing LLC.

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Section: A Experimental Resultsmentioning

confidence: 98%

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

et al. 2015

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“…Both the integrated SI experiment on OMEGA [8] and the PIC simulation [6] showed that the LPI generated hot electrons with a temperature of ∼ 30 keV. A recent short pulse experiment found high level reflectivity of SBS under SI-relevant intensities [9]. Due to the sensitivity and nonlinearity of LPI's dependence on laser and plasma conditions, it is very important to explore the wide parameter space and understand the physics among the complicated LPI instabilities in SI.…”

Section: Introductionmentioning

confidence: 99%

Simulation of stimulated Brillouin scattering and stimulated Raman scattering in shock ignition

Hao

Liu

et al. 2016

Physics of Plasmas

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We study stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) in shock ignition by comparing fluid and PIC simulations. Under typical parameters for the OMEGA experiments [Theobald et al., Phys. Plasmas 19, 102706 (2012)], a series of 1D fluid simulations with laser intensities ranging between 2×1015 and 2×10 16 W/cm 2 finds that SBS is the dominant instability, which increases significantly with the incident intensity. Strong pump depletion caused by SBS and SRS limits the transmitted intensity at the 0.17nc to be less than 3.5×10 15 W/cm 2 . The PIC simulations show similar physics but with higher saturation levels for SBS and SRS convective modes and stronger pump depletion due to higher seed levels for the electromagnetic fields in PIC codes. Plasma flow profiles are found to be important in proper modeling of SBS and limiting its reflectivity in both the fluid and PIC simulations.

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“…However, structures with smooth and known density profile were not yet achieved as a stable technology and would be preferable, for example, for Rayleigh-Tailor instabilities mitigation, laser energy smoothing, laboratory astrophysics studies and as a substitute for step-density targets to generate plasma profile close to the one of the corona of compresses shock-ignition target [3].…”

Section: Introductionmentioning

confidence: 99%