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Density and Temperature Correlations in the SOL; Implications for Gas Puff Imaging of Turbulence
Author(s) -
Moulton D.,
Marandet Y.,
Tamain P.,
Ghendrih Ph.,
Futtersack R.
Publication year - 2014
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201410089
Subject(s) - electron temperature , turbulence , plasma , electron density , physics , atomic physics , electron , interpretation (philosophy) , computational physics , materials science , thermodynamics , nuclear physics , computer science , programming language
Using a two‐dimensional turbulence model, a strong linear correlation is found between density and electron temperature within scrape‐off layer fluctuations. This has important implications for gas puff image interpretation for two commonly used lines, D α and HeI (587.6 nm). D α emission responds approximately linearly to proportional changes in the underlying plasma density and electron temperature, making image interpretation relatively straightforward. However, above ∼25 eV, HeI (587.6 nm) emission is approximately constant with proportional changes in density and electron temperature, so underlying plasma perturbations may go unseen. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)