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Title: Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility

Abstract

Time resolved hard x-ray images (hv>9 keV) and time integrated hard x-ray spectra (hv=18-150 keV) from vacuum hohlraums irradiated with four 351 nm wavelength National Ignition Facility [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technol. 26, 755 (1994)] laser beams are presented as a function of hohlraum size, laser power, and duration. The hard x-ray images and spectra provide insight into the time evolution of the hohlraum plasma filling and the production of hot electrons. The fraction of laser energy detected as hot electrons (F{sub hot}) shows a correlation with laser intensity and with an empirical hohlraum plasma filling model. In addition, the significance of Au K-alpha emission and Au K-shell reabsorption observed in some of the bremsstrahlung dominated spectra is discussed.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States) (and others)
Publication Date:
OSTI Identifier:
20782563
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 3; Other Information: DOI: 10.1063/1.2186927; (c) 2006 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; BREMSSTRAHLUNG; CORRELATIONS; ELECTRONS; GOLD; HARD X RADIATION; ICF DEVICES; IRRADIATION; K SHELL; KEV RANGE; LASERS; LIGHT TRANSMISSION; PLASMA; PLASMA DIAGNOSTICS; PLASMA HEATING; TIME RESOLUTION; US NATIONAL IGNITION FACILITY; X-RAY SOURCES; X-RAY SPECTRA

Citation Formats

McDonald, J.W., Suter, L.J., Landen, O.L., Foster, J.M., Celeste, J.R., Holder, J.P., Dewald, E.L., Schneider, M.B., Hinkel, D.E., Kauffman, R.L., Atherton, L.J., Bonanno, R.E., Dixit, S.N., Eder, D.C., Haynam, C.A., Kalantar, D.H., Koniges, A.E., Lee, F.D., MacGowan, B.J., and Manes, K.R. Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility. United States: N. p., 2006. Web. doi:10.1063/1.2186927.
McDonald, J.W., Suter, L.J., Landen, O.L., Foster, J.M., Celeste, J.R., Holder, J.P., Dewald, E.L., Schneider, M.B., Hinkel, D.E., Kauffman, R.L., Atherton, L.J., Bonanno, R.E., Dixit, S.N., Eder, D.C., Haynam, C.A., Kalantar, D.H., Koniges, A.E., Lee, F.D., MacGowan, B.J., & Manes, K.R. Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility. United States. doi:10.1063/1.2186927.
McDonald, J.W., Suter, L.J., Landen, O.L., Foster, J.M., Celeste, J.R., Holder, J.P., Dewald, E.L., Schneider, M.B., Hinkel, D.E., Kauffman, R.L., Atherton, L.J., Bonanno, R.E., Dixit, S.N., Eder, D.C., Haynam, C.A., Kalantar, D.H., Koniges, A.E., Lee, F.D., MacGowan, B.J., and Manes, K.R. Wed . "Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility". United States. doi:10.1063/1.2186927.
@article{osti_20782563,
title = {Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility},
author = {McDonald, J.W. and Suter, L.J. and Landen, O.L. and Foster, J.M. and Celeste, J.R. and Holder, J.P. and Dewald, E.L. and Schneider, M.B. and Hinkel, D.E. and Kauffman, R.L. and Atherton, L.J. and Bonanno, R.E. and Dixit, S.N. and Eder, D.C. and Haynam, C.A. and Kalantar, D.H. and Koniges, A.E. and Lee, F.D. and MacGowan, B.J. and Manes, K.R.},
abstractNote = {Time resolved hard x-ray images (hv>9 keV) and time integrated hard x-ray spectra (hv=18-150 keV) from vacuum hohlraums irradiated with four 351 nm wavelength National Ignition Facility [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technol. 26, 755 (1994)] laser beams are presented as a function of hohlraum size, laser power, and duration. The hard x-ray images and spectra provide insight into the time evolution of the hohlraum plasma filling and the production of hot electrons. The fraction of laser energy detected as hot electrons (F{sub hot}) shows a correlation with laser intensity and with an empirical hohlraum plasma filling model. In addition, the significance of Au K-alpha emission and Au K-shell reabsorption observed in some of the bremsstrahlung dominated spectra is discussed.},
doi = {10.1063/1.2186927},
journal = {Physics of Plasmas},
number = 3,
volume = 13,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}