Artículo
Inferring divertor plasma properties from hydrogen Balmer and Paschen series spectroscopy in JET-ILW
Autor/es | Lomanowski, B.A.
Meigs, A.G. Sharples, R.M. Stamp, M. Guillemaut, C. Jet Contributors García Muñoz, Manuel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2015-12 |
Fecha de depósito | 2020-08-27 |
Publicado en |
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Resumen | A parametrised spectral line profile model is formulated to investigate the diagnostic scope for
recovering plasma parameters from hydrogenic Balmer and Paschen series spectroscopy in the
context of JET-ILW divertor ... A parametrised spectral line profile model is formulated to investigate the diagnostic scope for recovering plasma parameters from hydrogenic Balmer and Paschen series spectroscopy in the context of JET-ILW divertor plasmas. The separate treatment of Zeeman and Stark contributions in the line model is tested against the PPP-B code which accounts for their combined influence on the spectral line shape. The proposed simplified model does not fully reproduce the Stark–Zeeman features for the α and β transitions, but good agreement is observed in the line width and wing profiles, especially for n > 5. The line model has been applied to infer radial density profiles in the JET-ILW divertor with generally good agreement between the D 5 → 2, 5 → 3, 6 2 → , 7 → 2 and 9 → 2 lines for high recycling and detached conditions. In an L-mode detached plasma pulse the Langmuir probe measurements typically underestimated the density by a factor 2–3 and overestimated the electron temperature by a factor of 5–10 compared to spectroscopically derived values. The line model is further used to generate synthetic highresolution spectra for low-n transitions to assess the potential for parameter recovery using a multi-parametric fitting technique. In cases with 4 parameter fits with a single Maxwellian neutral temperature component the D 4 → 3 line yields the best results with parameter estimates within 10% of the input values. For cases with 9 parameter fits inclusive of a multi-component neutral velocity distribution function the quality of the fits is degraded. Simultaneous fitting of the D 3 → 2 and 4 → 3 profiles improves the fit quality significantly, highlighting the importance of complementary spectroscopic measurements for divertor plasma emission studies |
Identificador del proyecto | 633053
EP/K504178/1 |
Cita | Lomanowski, B.A., Meigs, A.G., Sharples, R.M., Stamp, M., Guillemaut, C., Jet Contributors, y García Muñoz, M. (2015). Inferring divertor plasma properties from hydrogen Balmer and Paschen series spectroscopy in JET-ILW. Nuclear Fusion, 55 (12), 123028-. |
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