Assessment of Gradient Effects on Soft X-ray Spectral Measurements on the Z Machine
POSTER
Abstract
Accurate assessment of temperature, density, magnetic field, opacity, etc. can be complicated by a spatial gradient or rapid temporal variation, among other factors. The Z Pinch Dynamic Hohlraum (ZPDH) radially emits X-rays that are used for backlighting and for heating a plastic (CH)-tamped sub-micron-radially-thick magnesium sodium-flouride (MgNaF) foil. Simulations were performed over a range of temperature and density values to match observed absorption spectra and thereby determine experimental plasma parameters. Impurity-oxygen lines were included, using our recently developed isoelectronic line-ratio technique for soft x-ray absorption spectra as a temperature diagnostic on Z [Lane, et al., ICHEDS 2017] to overcome previous discrepancies between theoretical and experimental results.
*Financial support from DOE-SC-FES grant DE-SC0012515 and NNSA is gratefully acknowledged. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.
Presenters
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David Dunkum
- West Virginia University