High-resolution spectroscopy for Doppler-broadening ion temperature measurements of implosions at the National Ignition Facility

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4731747· OSTI ID:22093907

Koch, J. A.; Stewart, R. E.; Beiersdorfer, P.; Shepherd, R.; Schneider, M. B.; Miles, A. R.; Scott, H. A.; Smalyuk, V. A.; Hsing, W. W. ^[1]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, L-493, Livermore, California 94550 (United States)

Future implosion experiments at the national ignition facility (NIF) will endeavor to simultaneously measure electron and ion temperatures with temporal and spatial resolution in order to explore non-equilibrium temperature distributions and their relaxation toward equilibrium. In anticipation of these experiments, and with understanding of the constraints of the NIF facility environment, we have explored the use of Doppler broadening of mid-Z dopant emission lines, such as krypton He-{alpha} at 13 keV, as a diagnostic of time- and potentially space-resolved ion temperature. We have investigated a number of options analytically and with numerical raytracing, and we have identified several promising candidate spectrometer designs that meet the expected requirements of spectral and temporal resolution and data signal-to-noise ratio for gas-filled exploding pusher implosions, while providing maximum flexibility for use on a variety of experiments that potentially include burning plasma.

• OSTI ID: 22093907
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DOPPLER BROADENING
ELECTRON SPECTROSCOPY
EQUILIBRIUM
EXPLOSIONS
FLEXIBILITY
IMPLOSIONS
ION TEMPERATURE
PLASMA
RELAXATION
SIGNAL-TO-NOISE RATIO
SPATIAL RESOLUTION
SPECTROMETERS
TEMPERATURE DISTRIBUTION
TEMPERATURE MEASUREMENT
US NATIONAL IGNITION FACILITY