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Title: Multi-beam effects on backscatter and its saturation in experiments with conditions relevant to ignition

Abstract

To optimize the coupling to indirect drive targets in the National Ignition Campaign (NIC) at the National Ignition Facility, a model of stimulated scattering produced by multiple laser beams is used. The model has shown that scatter of the 351 nm beams can be significantly enhanced over single beam predictions in ignition relevant targets by the interaction of the multiple crossing beams with a millimeter scale length, 2.5 keV, 0.02 - 0.05 x critical density, plasma. The model uses a suite of simulation capabilities and its key aspects are benchmarked with experiments at smaller laser facilities. The model has also influenced the design of the initial targets used for NIC by showing that both the stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) can be reduced by the reduction of the plasma density in the beam intersection volume that is caused by an increase in the diameter of the laser entrance hole (LEH). In this model, a linear wave response leads to a small gain exponent produced by each crossing quad of beams (<~1 per quad) which amplifies the scattering that originates in the target interior where the individual beams are separated and crosses many or all other beamsmore » near the LEH as it exits the target. As a result all 23 crossing quads of beams produce a total gain exponent of several or greater for seeds of light with wavelengths in the range that is expected for scattering from the interior (480 to 580 nm for SRS). This means that in the absence of wave saturation, the overall multi-beam scatter will be significantly larger than the expectations for single beams. The potential for non-linear saturation of the Langmuir waves amplifying SRS light is also analyzed with a two dimensional, vectorized, particle in cell code (2D VPIC) that is benchmarked by amplification experiments in a plasma with normalized parameters similar to ignition targets. The physics of cumulative scattering by multiple crossing beams that simultaneously amplify the same SBS light wave is further demonstrated in experiments that benchmark the linear models for the ion waves amplifying SBS. Here, the expectation from this model and its experimental benchmarks is shown to be consistent with observations of stimulated Raman scatter in the first series of energetic experiments with ignition targets, confirming the importance of the multi-beam scattering model for optimizing coupling.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [2];  [1];  [3];  [3];  [4] more »;  [5];  [5];  [5];  [6];  [1];  [1];  [1];  [1];  [1] « less
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. Univ. of Rochester, Rochester, NY (United States)
  5. Princeton Univ., Princeton, NJ (United States)
  6. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415555
Report Number(s):
LLNL-JRNL-462675
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Kirkwood, R. K., Michel, P., London, R., Moody, J. D., Dewald, E., Yin, L., Kline, J., Hinkel, D., Callahan, D., Meezan, N., Williams, E., Divol, L., Albright, B. L., Bowers, K. J., Bond, E., Rose, H., Ping, Y., Wang, T. L., Joshi, C., Seka, W., Fisch, N. J., Turnbull, D., Suckewer, S., Wurtele, J. S., Glenzer, S., Suter, L., Haynam, C., Landen, O., and Macgowan, B. J. Multi-beam effects on backscatter and its saturation in experiments with conditions relevant to ignition. United States: N. p., 2011. Web. doi:10.1063/1.3587122.
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Kirkwood, R. K., Michel, P., London, R., Moody, J. D., Dewald, E., Yin, L., Kline, J., Hinkel, D., Callahan, D., Meezan, N., Williams, E., Divol, L., Albright, B. L., Bowers, K. J., Bond, E., Rose, H., Ping, Y., Wang, T. L., Joshi, C., Seka, W., Fisch, N. J., Turnbull, D., Suckewer, S., Wurtele, J. S., Glenzer, S., Suter, L., Haynam, C., Landen, O., & Macgowan, B. J. Multi-beam effects on backscatter and its saturation in experiments with conditions relevant to ignition. United States. https://doi.org/10.1063/1.3587122
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Kirkwood, R. K., Michel, P., London, R., Moody, J. D., Dewald, E., Yin, L., Kline, J., Hinkel, D., Callahan, D., Meezan, N., Williams, E., Divol, L., Albright, B. L., Bowers, K. J., Bond, E., Rose, H., Ping, Y., Wang, T. L., Joshi, C., Seka, W., Fisch, N. J., Turnbull, D., Suckewer, S., Wurtele, J. S., Glenzer, S., Suter, L., Haynam, C., Landen, O., and Macgowan, B. J. Thu . "Multi-beam effects on backscatter and its saturation in experiments with conditions relevant to ignition". United States. https://doi.org/10.1063/1.3587122. https://www.osti.gov/servlets/purl/1415555.
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@article{osti_1415555,
title = {Multi-beam effects on backscatter and its saturation in experiments with conditions relevant to ignition},
author = {Kirkwood, R. K. and Michel, P. and London, R. and Moody, J. D. and Dewald, E. and Yin, L. and Kline, J. and Hinkel, D. and Callahan, D. and Meezan, N. and Williams, E. and Divol, L. and Albright, B. L. and Bowers, K. J. and Bond, E. and Rose, H. and Ping, Y. and Wang, T. L. and Joshi, C. and Seka, W. and Fisch, N. J. and Turnbull, D. and Suckewer, S. and Wurtele, J. S. and Glenzer, S. and Suter, L. and Haynam, C. and Landen, O. and Macgowan, B. J.},
abstractNote = {To optimize the coupling to indirect drive targets in the National Ignition Campaign (NIC) at the National Ignition Facility, a model of stimulated scattering produced by multiple laser beams is used. The model has shown that scatter of the 351 nm beams can be significantly enhanced over single beam predictions in ignition relevant targets by the interaction of the multiple crossing beams with a millimeter scale length, 2.5 keV, 0.02 - 0.05 x critical density, plasma. The model uses a suite of simulation capabilities and its key aspects are benchmarked with experiments at smaller laser facilities. The model has also influenced the design of the initial targets used for NIC by showing that both the stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) can be reduced by the reduction of the plasma density in the beam intersection volume that is caused by an increase in the diameter of the laser entrance hole (LEH). In this model, a linear wave response leads to a small gain exponent produced by each crossing quad of beams (<~1 per quad) which amplifies the scattering that originates in the target interior where the individual beams are separated and crosses many or all other beams near the LEH as it exits the target. As a result all 23 crossing quads of beams produce a total gain exponent of several or greater for seeds of light with wavelengths in the range that is expected for scattering from the interior (480 to 580 nm for SRS). This means that in the absence of wave saturation, the overall multi-beam scatter will be significantly larger than the expectations for single beams. The potential for non-linear saturation of the Langmuir waves amplifying SRS light is also analyzed with a two dimensional, vectorized, particle in cell code (2D VPIC) that is benchmarked by amplification experiments in a plasma with normalized parameters similar to ignition targets. The physics of cumulative scattering by multiple crossing beams that simultaneously amplify the same SBS light wave is further demonstrated in experiments that benchmark the linear models for the ion waves amplifying SBS. Here, the expectation from this model and its experimental benchmarks is shown to be consistent with observations of stimulated Raman scatter in the first series of energetic experiments with ignition targets, confirming the importance of the multi-beam scattering model for optimizing coupling.},
doi = {10.1063/1.3587122},
journal = {Physics of Plasmas},
number = 5,
volume = 18,
place = {United States},
year = {Thu May 26 00:00:00 EDT 2011},
month = {Thu May 26 00:00:00 EDT 2011}
}
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https://doi.org/10.1063/1.3587122
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    Works referencing / citing this record:

    Stimulated Raman scatter analyses of experiments conducted at the National Ignition Facility
    journal, May 2011

    • Hinkel, D. E.; Rosen, M. D.; Williams, E. A.
    • Physics of Plasmas, Vol. 18, Issue 5
    • DOI: 10.1063/1.3577836

    Threshold for electron trapping nonlinearity in Langmuir waves
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    Direct-drive inertial confinement fusion: A review
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    • Physics of Plasmas, Vol. 26, Issue 8
    • DOI: 10.1063/1.5111334

    Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves
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    • Hüller, S.; Raj, G.; Rozmus, W.
    • Physics of Plasmas, Vol. 27, Issue 2
    • DOI: 10.1063/1.5125759

    Raman backscattering saturation due to coupling between ω p and 2 ω p modes in plasma
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    Threshold for Electron Trapping Nonlinearity in Langmuir Waves
    text, January 2012

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