Temperature dependence of parametric instabilities in the context of the shock-ignition approach to inertial confinement fusion

Weber, S.; Riconda, C.

doi:10.1017/hpl.2014.50

Cited by 47 publications

(29 citation statements)

References 69 publications

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“…In previous small-scale-length PIC simulations [4,5,7], pump depletion through convective SRS and SBS in the low density region was not significant, due to the small lengths. The long-scale-length simulations here show that the convective modes can lead to significant pump depletion before the quarter-critical surface and an accurate assessment of this requires control of the seed levels in simulations.…”

Section: Discussion and Summarymentioning

confidence: 77%

“…In this high laser intensity regime, growth rates of many laser plasma instabilities (LPI) exceed their thresholds, such as the two plasmon decay (TPD), the stimulated Raman scattering (SRS), and the stimulated Brillouin scattering (SBS). Previous Particle-in-Cell (PIC) simulations showed large laser reflectivities at high intensities due to SBS and SRS [3,4], saturation of TPD due to plasma cavity formation [5], intermittent LPI activities due to interplay of modes at different density regions [6], and LPI's dependence on plasma temperatures [7]. 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.…”

Section: Introductionmentioning

confidence: 96%

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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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Section: Discussion and Summarymentioning

confidence: 77%

Section: Introductionmentioning

confidence: 96%

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

Hao

Liu

et al. 2016

Physics of Plasmas

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“…151.22(a), is in the SRS-dominated regime: the threshold for SRS is exceeded by a factor of +22, while the TPD threshold is exceeded by a factor of +6. It is expected that this qualitative trend of SRS being increasingly prominent relative to TPD with increasing scale length and temperature 32 applies also for more-complicated cases of multiple obliquely incident beams, although this is a subject of future work. This observation is attributed to SRS sidescatter, 33 for which newly developed theory and supporting simulations are described in a companion manuscript.…”

Section: Origins and Scaling Of Hot-electron Preheat In Ignition-scalmentioning

confidence: 96%

Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments

et al. 2018

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Planar laser-plasma interaction (LPI) experiments at the National Ignition Facility (NIF) have allowed access for the first time to regimes of electron density scale length (∼500 to 700 μm), electron temperature (∼3 to 5 keV), and laser intensity (6 to 16×10^{14} W/cm^{2}) that are relevant to direct-drive inertial confinement fusion ignition. Unlike in shorter-scale-length plasmas on OMEGA, scattered-light data on the NIF show that the near-quarter-critical LPI physics is dominated by stimulated Raman scattering (SRS) rather than by two-plasmon decay (TPD). This difference in regime is explained based on absolute SRS and TPD threshold considerations. SRS sidescatter tangential to density contours and other SRS mechanisms are observed. The fraction of laser energy converted to hot electrons is ∼0.7% to 2.9%, consistent with observed levels of SRS. The intensity threshold for hot-electron production is assessed, and the use of a Si ablator slightly increases this threshold from ∼4×10^{14} to ∼6×10^{14} W/cm^{2}. These results have significant implications for mitigation of LPI hot-electron preheat in direct-drive ignition designs.

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“…These processes are important as they determine also the hot electron production. Depending on their distribution function they might be beneficial for driving shocks or detrimental as they can induce preheat of the compressed fuel (two recent reviews consider in some details parametric processes for ICF using kinetic simulations [23,24] and detailed references therein).…”

Section: Warm Dense Mattermentioning

confidence: 99%

P3: An installation for high-energy density plasma physics and ultra-high intensity laser–matter interaction at ELI-Beamlines

Weber

Bechet

Borneis

et al. 2017

Matter and Radiation at Extremes

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141

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ELI-Beamlines (ELI-BL), one of the three pillars of the Extreme Light Infrastructure endeavour, will be in a unique position to perform research in high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently the need for HED laboratory physics was identified and the P3 (plasma physics platform) installation under construction in ELI-BL will be an answer. The ELI-BL 10 PW laser makes possible fundamental research topics from high-field physics to new extreme states of matter such as radiation-dominated ones, high-pressure quantum ones, warm dense matter (WDM) and ultra-relativistic plasmas. HEDP is of fundamental importance for research in the field of laboratory astrophysics and inertial confinement fusion (ICF). Reaching such extreme states of matter now and in the future will depend on the use of plasma optics for amplifying and focusing laser pulses. This article will present the relevant technological infrastructure being built in ELI-BL for HEDP and UHI, and gives a brief overview of some research under way in the field of UHI, laboratory astrophysics, ICF, WDM, and plasma optics.

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Temperature dependence of parametric instabilities in the context of the shock-ignition approach to inertial confinement fusion

Cited by 47 publications

References 69 publications

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

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

Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments

P3: An installation for high-energy density plasma physics and ultra-high intensity laser–matter interaction at ELI-Beamlines

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