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Title: Role of hydrodynamics simulations in laser-plasma interaction predictive capability

Abstract

Efforts to predict and control laser-plasma interactions (LPI) in ignition hohlraum targets for the National Ignition Facility [G. H. Miller et al., Opt. Eng. 43, 2841 (2004)] are based on plasma conditions provided by radiation hydrodynamic simulations. Recent experiments provide compelling evidence that codes such as HYDRA [M. M. Marinak et al., Phys. Plasmas 8, 2275 (2001)] can accurately predict the plasma conditions in laser-heated targets such as gas-filled balloon (gasbag) and hohlraum platforms for studying LPI. Initially puzzling experimental observations are found to be caused by bulk hydrodynamic phenomena. Features in backscatter spectra and transmitted light spectra are reproduced from the simulated plasma conditions. Simulations also agree well with Thomson scattering measurements of the electron temperature. The calculated plasma conditions are used to explore a linear-gain based phenomenological model of backscatter. For long plasmas at ignition-relevant electron temperatures, the measured backscatter increases monotonically with gain and is consistent with linear growth for low reflectivities. These results suggest a role for linear gain postprocessing as a metric for assessing LPI risk.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808 (United States)
Publication Date:
OSTI Identifier:
20975062
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2710782; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONTROL; ELECTRON TEMPERATURE; GAIN; HYDRODYNAMICS; ION TEMPERATURE; LASERS; PLASMA; PLASMA DIAGNOSTICS; PLASMA HEATING; PLASMA SIMULATION; THOMSON SCATTERING; US NATIONAL IGNITION FACILITY

Citation Formats

Meezan, N. B., Berger, R. L., Divol, L., Froula, D. H., Hinkel, D. E., Jones, O. S., London, R. A., Moody, J. D., Marinak, M. M., Niemann, C., Neumayer, P. B., Prisbrey, S. T., Ross, J. S., Williams, E. A., Glenzer, S. H., and Suter, L. J. Role of hydrodynamics simulations in laser-plasma interaction predictive capability. United States: N. p., 2007. Web. doi:10.1063/1.2710782.
Meezan, N. B., Berger, R. L., Divol, L., Froula, D. H., Hinkel, D. E., Jones, O. S., London, R. A., Moody, J. D., Marinak, M. M., Niemann, C., Neumayer, P. B., Prisbrey, S. T., Ross, J. S., Williams, E. A., Glenzer, S. H., & Suter, L. J. Role of hydrodynamics simulations in laser-plasma interaction predictive capability. United States. doi:10.1063/1.2710782.
Meezan, N. B., Berger, R. L., Divol, L., Froula, D. H., Hinkel, D. E., Jones, O. S., London, R. A., Moody, J. D., Marinak, M. M., Niemann, C., Neumayer, P. B., Prisbrey, S. T., Ross, J. S., Williams, E. A., Glenzer, S. H., and Suter, L. J. Tue . "Role of hydrodynamics simulations in laser-plasma interaction predictive capability". United States. doi:10.1063/1.2710782.
@article{osti_20975062,
title = {Role of hydrodynamics simulations in laser-plasma interaction predictive capability},
author = {Meezan, N. B. and Berger, R. L. and Divol, L. and Froula, D. H. and Hinkel, D. E. and Jones, O. S. and London, R. A. and Moody, J. D. and Marinak, M. M. and Niemann, C. and Neumayer, P. B. and Prisbrey, S. T. and Ross, J. S. and Williams, E. A. and Glenzer, S. H. and Suter, L. J.},
abstractNote = {Efforts to predict and control laser-plasma interactions (LPI) in ignition hohlraum targets for the National Ignition Facility [G. H. Miller et al., Opt. Eng. 43, 2841 (2004)] are based on plasma conditions provided by radiation hydrodynamic simulations. Recent experiments provide compelling evidence that codes such as HYDRA [M. M. Marinak et al., Phys. Plasmas 8, 2275 (2001)] can accurately predict the plasma conditions in laser-heated targets such as gas-filled balloon (gasbag) and hohlraum platforms for studying LPI. Initially puzzling experimental observations are found to be caused by bulk hydrodynamic phenomena. Features in backscatter spectra and transmitted light spectra are reproduced from the simulated plasma conditions. Simulations also agree well with Thomson scattering measurements of the electron temperature. The calculated plasma conditions are used to explore a linear-gain based phenomenological model of backscatter. For long plasmas at ignition-relevant electron temperatures, the measured backscatter increases monotonically with gain and is consistent with linear growth for low reflectivities. These results suggest a role for linear gain postprocessing as a metric for assessing LPI risk.},
doi = {10.1063/1.2710782},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}