Theory and three-dimensional simulation of light filamentation in laser-produced plasma

Berger, R.L.; Lasinski, B. F.; Kaiser, T. B.; Williams, E. A.; Langdon, A. B.; Cohen, B. I.

doi:10.1063/1.860758

Cited by 129 publications

(54 citation statements)

References 43 publications

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“…For gas-filled hohlraums we find that the total scattering losses are reduced from (18 f 3)% for unsmoothed laser beams to (3 f 1)% when applying KPPs plus 0. 22 These experimental observations are consistent with calculations of the filamentation threshold [48,49] and with measured Raman spectra. We observe that short wavelength Raman scattering is gradually suppressed with improved beam smoothing consistent with a reduction of energy in hot spots which produce filamentation (KPP only) and the reduction of the filamentation rate of hot spots (with additional SSD).…”

Section: Hohlraum Coupling Experimentssupporting

confidence: 78%

X-ray spectroscopy from fusion plasmas

Glenzer¹

1999

The 14th International Conference on Spectral Line Shapes

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Our understanding of laser energy coupling into laser-driven inertial confinement fusion targets largely depends on our ability to accurately measure and simulate the plasma conditions in the underdense corona and in high density capsule implosions.X-ray spectroscopy is an important technique which has been applied to measure the total absorption of laser energy into the fusion target, the fraction of laser energy absorbed by hot electrons, and the conditions in the fusion capsule in terms of density and temperature. These parameters provide critical benchmarking data for performance studies of the fusion target and for radiation-hydrodynamic and laser-plasma interaction simulations. Using x-ray spectroscopic techniques for these tasks has required its application to non-standard conditions where kinetics models have not been extensively tested. In particular, for the conditions in high density implosions, where electron temperatures achieve 1 -2 keV and electron densities reach 10 24 cm-3 evolving on time scales of < 1 ns, no independent non-spectroscopic measurements of plasma parameters are available. For these reasons, we have in open-geometry gas bag plasmas at densities of 10 3 frformed experiments cm-3 and which am independently diagnosed with Thomson scattering and stimulated Raman scattering. We find that kinetics modeling is in good agreement with measured intensities of the dielectronic satellites of the He-p line (n= l-3) of Ar XVII. Applying these findings to the experimental results of capsule implosions provides additional evidence of' temperature gradients at peak compression.

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Section: Hohlraum Coupling Experimentssupporting

confidence: 78%

X-ray spectroscopy from fusion plasmas

Glenzer¹

1999

The 14th International Conference on Spectral Line Shapes

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“…However, we do not expect large errors as long as the plasma densities are significantly below the critical density ($10% critical) and the intensity is sufficiently low. The ponderomotive filamentation instability threshold is given 34 by the condition 8kf 2 k 0 > 1, where k ¼ c , n c is the critical density, v os is the quiver frequency of the electrons, x 0 is the laser frequency, and f is the f-number of the final focus (f ¼ 8 was used). The laser intensity corresponding to this threshold is then…”

Section: Laser Preheatmentioning

confidence: 99%

Scaling magnetized liner inertial fusion on Z and future pulsed-power accelerators

et al. 2016

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The MagLIF (Magnetized Liner Inertial Fusion) concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)] has demonstrated fusion–relevant plasma conditions [M. R. Gomez et al., Phys. Rev. Lett. 113, 155003 (2014)] on the Z accelerator with a peak drive current of about 18 MA. We present 2D numerical simulations of the scaling of MagLIF on Z as a function of drive current, preheat energy, and applied magnetic field. The results indicate that deuterium-tritium (DT) fusion yields greater than 100 kJ could be possible on Z when all of these parameters are at the optimum values: i.e., peak current = 25 MA, deposited preheat energy = 5 kJ, and Bz = 30 T. Much higher yields have been predicted [S. A. Slutz and R. A. Vesey, Phys. Rev. Lett. 108, 025003 (2012)] for MagLIF driven with larger peak currents. Two high performance pulsed-power accelerators (Z300 and Z800) based on linear-transformer-driver technology have been designed [W. A. Stygar et al., Phys. Rev. ST Accel. Beams 18, 110401 (2015)]. The Z300 design would provide 48 MA to a MagLIF load, while Z800 would provide 65 MA. Parameterized Thevenin-equivalent circuits were used to drive a series of 1D and 2D numerical MagLIF simulations with currents ranging from what Z can deliver now to what could be achieved by these conceptual future pulsed-power accelerators. 2D simulations of simple MagLIF targets containing just gaseous DT have yields of 18 MJ for Z300 and 440 MJ for Z800. The 2D simulated yield for Z800 is increased to 7 GJ by adding a layer of frozen DT ice to the inside of the liner.

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“…12 and 13 describe using a laser model different from that in Ref. 4, but only considers filamentation phenomenon.…”

Section: Introductionmentioning

confidence: 99%

The development of laser-plasma interaction program LAP3D on thousands of processors

Hao

Liu

et al. 2015

AIP Advances

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Modeling laser-plasma interaction (LPI) processes in real-size experiments scale is recognized as a challenging task. For explorering the influence of various instabilities in LPI processes, a three-dimensional laser and plasma code (LAP3D) has been developed, which includes filamentation, stimulated Brillouin backscattering (SBS), stimulated Raman backscattering (SRS), non-local heat transport and plasmas flow computation modules. In this program, a second-order upwind scheme is applied to solve the plasma equations which are represented by an Euler fluid model. Operator splitting method is used for solving the equations of the light wave propagation, where the Fast Fourier translation (FFT) is applied to compute the diffraction operator and the coordinate translations is used to solve the acoustic wave equation. The coupled terms of the different physics processes are computed by the second-order interpolations algorithm. In order to simulate the LPI processes in massively parallel computers well, several parallel techniques are used, such as the coupled parallel algorithm of FFT and fluid numerical computation, the load balance algorithm, and the data transfer algorithm. Now the phenomena of filamentation, SBS and SRS have been studied in low-density plasma successfully with LAP3D. Scalability of the program is demonstrated with a parallel efficiency above 50% on about ten thousand of processors. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Theory and three-dimensional simulation of light filamentation in laser-produced plasma

Cited by 129 publications

References 43 publications

X-ray spectroscopy from fusion plasmas

X-ray spectroscopy from fusion plasmas

Scaling magnetized liner inertial fusion on Z and future pulsed-power accelerators

The development of laser-plasma interaction program LAP3D on thousands of processors

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