Benchmarking of alternate theories for Stark broadening against experimental data from DIII-D diagnostics |
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| Authors: | N H Brooks S Lisgo E Oks D Volodko M Groth A W Leonard the DIII-D Team |
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| Institution: | (1) General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA;(2) University of Toronto Institute for Aerospace Studies, Toronto, Canada;(3) UKAEA Fusion Association, Culham Science Centre, Abingdon, UK;(4) Physics Department, Auburn University, Auburn, Alabama, USA;(5) Lawrence Livermore National Laboratory, Livermore, California, USA |
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| Abstract: | Spectroscopy of high-n Balmer line transitions provides a means of measuring n
e
and T
e
in recombining plasmas J. L. Terry et al., Phys. Plasmas 5, 1579 (1998)]. The relative intensities of Rydberg series lines near the ionization limit are a sensitive diagnostic of T
e
, for T
e
< 1.5 eV. Stark broadening of these same lines provides a measure of local n
e
and, with less accuracy, of T
e
. The accuracy of different theoretical models for Stark broadening H.R. Griem, Spectral Line Broadening by Plasmas (Academic, New York, 1974); E. Oks, Stark Broadening of Hydrogen and Hydrogenlike Spectral Lines in Plasmas: The Physical Insight (Alpha Science International, Oxford, UK, 2006)] is evaluated by comparing values of n
e
and T
e
measured on DIII-D by divertor Thomson scattering (DTS) with those deduced from spectral profile analysis of Balmer series
deuterium lines. In particular, the detailed dependence of line width on principal quantum number provides a sensitive metric
for distinguishing which model best accords with experiment.
Published in Russian in Fizika Plazmy, 2009, Vol. 35, No. 2, pp. 134–140.
This text was submitted by the authors in English. |
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