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Title: Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-D smoothing by spectral dispersion

Abstract

Direct-drive ignition on the National Ignition Facility (NIF) requires single-beam smoothing to minimize imprinting of laser nonuniformities that can negatively affect implosion performance. One-dimensional, multi-FM smoothing by spectral dispersion (SSD) has been proposed to provide the required smoothing [J. A. Marozas, J. D. Zuegel, and T. J. B. Collins, Bull. Am. Phys. Soc. 55, 294 (2010)]. A prototype multi-FM SSD system has been integrated into the NIF-like beamline of the OMEGA EP Laser System. Experiments have been performed to verify the smoothing performance by measuring Rayleigh–Taylor growth rates in planar targets of laser-imprinted and preimposed surface modulations. Multi-FM 1-D SSD has been observed to reduce imprint levels by ~50% compared to the nominal OMEGA EP SSD system. In conclusion, the experimental results are in agreement with 2-D DRACO simulations using realistic, time-dependent far-field spot-intensity calculations that emulate the effect of SSD.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [3];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE
OSTI Identifier:
1328777
Alternate Identifier(s):
OSTI ID: 1321038
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; diffraction gratings; optical dispersion; x-ray optics; optical depth; speckle patterns

Citation Formats

Hohenberger, M., Shvydky, A., Marozas, J. A., Fiksel, G., Bonino, M. J., Canning, D., Collins, T. J. B., Dorrer, C., Kessler, T. J., Kruschwitz, B. E., McKenty, P. W., Meyerhofer, D. D., Regan, S. P., Sangster, T. C., and Zuegel, J. D. Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-D smoothing by spectral dispersion. United States: N. p., 2016. Web. doi:10.1063/1.4962185.
Hohenberger, M., Shvydky, A., Marozas, J. A., Fiksel, G., Bonino, M. J., Canning, D., Collins, T. J. B., Dorrer, C., Kessler, T. J., Kruschwitz, B. E., McKenty, P. W., Meyerhofer, D. D., Regan, S. P., Sangster, T. C., & Zuegel, J. D. Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-D smoothing by spectral dispersion. United States. doi:10.1063/1.4962185.
Hohenberger, M., Shvydky, A., Marozas, J. A., Fiksel, G., Bonino, M. J., Canning, D., Collins, T. J. B., Dorrer, C., Kessler, T. J., Kruschwitz, B. E., McKenty, P. W., Meyerhofer, D. D., Regan, S. P., Sangster, T. C., and Zuegel, J. D. Wed . "Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-D smoothing by spectral dispersion". United States. doi:10.1063/1.4962185. https://www.osti.gov/servlets/purl/1328777.
@article{osti_1328777,
title = {Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-D smoothing by spectral dispersion},
author = {Hohenberger, M. and Shvydky, A. and Marozas, J. A. and Fiksel, G. and Bonino, M. J. and Canning, D. and Collins, T. J. B. and Dorrer, C. and Kessler, T. J. and Kruschwitz, B. E. and McKenty, P. W. and Meyerhofer, D. D. and Regan, S. P. and Sangster, T. C. and Zuegel, J. D.},
abstractNote = {Direct-drive ignition on the National Ignition Facility (NIF) requires single-beam smoothing to minimize imprinting of laser nonuniformities that can negatively affect implosion performance. One-dimensional, multi-FM smoothing by spectral dispersion (SSD) has been proposed to provide the required smoothing [J. A. Marozas, J. D. Zuegel, and T. J. B. Collins, Bull. Am. Phys. Soc. 55, 294 (2010)]. A prototype multi-FM SSD system has been integrated into the NIF-like beamline of the OMEGA EP Laser System. Experiments have been performed to verify the smoothing performance by measuring Rayleigh–Taylor growth rates in planar targets of laser-imprinted and preimposed surface modulations. Multi-FM 1-D SSD has been observed to reduce imprint levels by ~50% compared to the nominal OMEGA EP SSD system. In conclusion, the experimental results are in agreement with 2-D DRACO simulations using realistic, time-dependent far-field spot-intensity calculations that emulate the effect of SSD.},
doi = {10.1063/1.4962185},
journal = {Physics of Plasmas},
number = 9,
volume = 23,
place = {United States},
year = {2016},
month = {9}
}

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