Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics

Strozzi, D. J.; Bailey, David; Michel, P.; Divol, L.; Sepke, S. M.; Kerbel, G. D.; Thomas, C. A.; Ralph, J. E.; Moody, J. D.; Schneider, M. B.

doi:10.1103/physrevlett.118.025002

Cited by 74 publications

(49 citation statements)

References 26 publications

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“…Both calculations used a flux limiter of 0.15 and both included CBET. The CBET was calculated using the inline CBET package 23 with the maximum δn/n set to 0.01. Because we were focused on the drive and bang time rather than the drive symmetry, the radiation drive was artificially symmetrized to force a symmetric implosion.…”

Section: Improved Dca Nlte Modelmentioning

confidence: 99%

Progress towards a more predictive model for hohlraum radiation drive and symmetry

et al. 2017

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For several years, we have been calculating the radiation drive in laser-heated gold hohlraums using flux-limited heat transport with a limiter of 0.15, tabulated values of local thermodynamic equilibrium gold opacity, and an approximate model for not in a local thermodynamic equilibrium (NLTE) gold emissivity (DCA_2010). This model has been successful in predicting the radiation drive in vacuum hohlraums, but for gas-filled hohlraums used to drive capsule implosions, the model consistently predicts too much drive and capsule bang times earlier than measured. In this work, we introduce a new model that brings the calculated bang time into better agreement with the measured bang time. The new model employs (1) a numerical grid that is fully converged in space, energy, and time, (2) a modified approximate NLTE model that includes more physics and is in better agreement with more detailed offline emissivity models, and (3) a reduced flux limiter value of 0.03. We applied this model to gas-filled hohlraum experiments using high density carbon and plastic ablator capsules that had hohlraum He fill gas densities ranging from 0.06 to 1.6 mg/cc and hohlraum diameters of 5.75 or 6.72 mm. The new model predicts bang times to within ±100 ps for most experiments with low to intermediate fill densities (up to 0.85 mg/cc). This model predicts higher temperatures in the plasma than the old model and also predicts that at higher gas fill densities, a significant amount of inner beam laser energy escapes the hohlraum through the opposite laser entrance hole.

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Section: Improved Dca Nlte Modelmentioning

confidence: 99%

Progress towards a more predictive model for hohlraum radiation drive and symmetry

et al. 2017

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“…Understanding the onset and saturation of stimulated Brillouin scattering (SBS) and crossed-beam energy transfer [2,3] mediated by IAWs is vital to designing successful experiments and avoiding optics damage [4,5]. Ongoing efforts to model laser-plasma interaction in ICF experiments [6] with linear plasma wave descriptions require clamps on IAW amplitudes, suggesting IAW nonlinearity. Experimentally, IAW decay has been correlated with SBS saturation [7] and off-axis decay modes have been observed [8].…”

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confidence: 99%

Longitudinal and Transverse Instability of Ion Acoustic Waves

et al. 2017

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Ion acoustic waves are found to be susceptible to at least two distinct decay processes. Which process dominates depends on the parameters. In the cases examined, the decay channel where daughter modes propagate parallel to the mother mode is found to dominate at larger amplitudes, while the decay channel where the daughter modes propagate at angles to the mother mode dominates at smaller amplitudes. Both decay processes may occur simultaneously and with onset thresholds below those suggested by fluid theory, resulting in the eventual multidimensional collapse of the mother mode to a turbulent state.

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“…范畴下提出了多种可能的不稳定性机制, 如共用电子等离子体波的双等离子体衰变(Two Plasmon Decay, TPD)和SRS [97,98] 、共用离子声波的SBS [99] 、残余激光作为增益种子由对面光束激发SBS等 [100] 等离子体波沉积了很多能量在激光注入孔附近等 [101] .…”

Section: 与预期存在较大偏离以来研究人员已经在多光束Lpiunclassified

Laser plasma instability in indirect-drive inertial confinement fusion

Yang¹,

Li²,

Li³

et al. 2018

Sci. Sin.-Phys. Mech. Astron.

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In indirect-drive inertial confinement fusion (ICF), the incident laser beam could excite laser plasma instabilities (LPI) such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) and two plasmon decay (TPD) besides gently heat the hohlraum through collisional absorption. These instabilities would largely reduce the X-ray conversion and degrade the drive symmetry of the radiation environment. In addition, when the amplitude of parametric instability increases to a certain level, there would be interplay between different instabilities, which makes LPI complicated and unpredictable. Therefore, LPI has become one of the major challenge in achieving ignition. LPI research during recent few years made great strides in identifying, understanding, and controlling instabilities in the context of laser fusion. This paper reviews the progress in this important field according to laser (L), plasma (P), and instability (I). Prospects for the application of our improved understanding for indirect drive ICF and some exciting research opportunities are also discussed.

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Interplay of Laser-Plasma Interactions and Inertial Fusion Hydrodynamics

Cited by 74 publications

References 26 publications

Progress towards a more predictive model for hohlraum radiation drive and symmetry

Progress towards a more predictive model for hohlraum radiation drive and symmetry

Longitudinal and Transverse Instability of Ion Acoustic Waves

Laser plasma instability in indirect-drive inertial confinement fusion

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