Improved Interpretation of Stark Broadening Data from Detached Divertor Plasmas

Journal Article · Wed Nov 22 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2402777· OSTI ID:20895172

Lisgo, S ^[1]; Brooks, N; Leonard, A W ^[2]; Oks, E; Volodko, D ^[3]; Groth, M ^[4]

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1. University of Toronto Institute for Aerospace Studies, Toronto, M3H 5T6 (Canada)
2. General Atomics, San Diego, California 92186-5608 (United States)
3. Physics Department, Auburn University, Auburn, AL 36849-5311 (United States)
4. Lawrence Livermore National Laborabory, Livermore, California 94550 (United States)

Stark broadening analysis of high-n Balmer series transitions (n=10{yields}2) is benchmarked against electron density measurements from a Thomson scattering system in the divertor region of the DIII-D tokamak. The time-averaged Thomson data show ne = 6.0{+-}0.5x1020 m-3 in the low Te region ({approx}1 eV) of a detached divertor plasma. Analysis of the measured Stark broadened Balmer series line widths using conventional theory gives ne 6.7{+-}1.3x1020 m-3. A more advanced analysis technique, which is referred to here as generalized theory and includes additional Stark broadening effects related to the dynamics of ion electric field [E. Oks, Stark Broadening of Hydrogen and Hydrogenlike Spectral Lines in Plasmas: The Physical Insight, Alpha Science International, Oxford, UK, 2006], was also applied and produces ne = 5.3 {+-} 0.5 x 1020 m-3. In addition, electron temperature information of Te {approx_equal} 1 eV is also determined (conventional theory does not allow for a temperature dependence). The improved diagnostic results suggest that these additional mechanisms should be included when analyzing Stark broadening data from tokamak divertors.

• OSTI ID: 20895172
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 874; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIVERTORS
DOUBLET-3 DEVICE
ELECTRIC FIELDS
ELECTRON DENSITY
ELECTRON TEMPERATURE
HYDROGEN
IONS
LINE BROADENING
LINE WIDTHS
PLASMA
STARK EFFECT
TEMPERATURE DEPENDENCE
THOMSON SCATTERING