Consistency of atomic data for the interpretation of beam emission spectra

TitleConsistency of atomic data for the interpretation of beam emission spectra
Publication TypeJournal Article
Year of Publication2010
AuthorsE. Delabie, M. Brix, C. Giroud, R.JE Jaspers, O. Marchuk, M.G O'Mullane, Y. Ralchenko, E. Surrey, M.G von Hellermann, K.D Zastrow
JournalPlasma Physics and Controlled Fusion
Volume52
Number12
Pagination17
Date PublishedDec
Type of ArticleArticle
ISBN Number0741-3335
Accession NumberISI:000284406600058
Keywords1ST EXCITED-STATE, BARE IONS, FRACTIONS, FUSION PLASMAS, IONIZATION, POWER, PROTON-HYDROGEN COLLISIONS, RECOMBINATION, SPECTROSCOPY, TEXTOR, TOKAMAK
Abstract

Several collisional-radiative (CR) models (Anderson et al 2000 Plasma Phys. Control. Fusion 42 781-806, Hutchinson 2002 Plasma Phys. Control. Fusion 44 71-82, Marchuk et al 2008 Rev. Sci. Instrum. 79 10F532) have been developed to calculate the attenuation and the population of excited states of hydrogen or deuterium beams injected into tokamak plasmas. The datasets generated by these CR models are needed for the modelling of beam ion deposition and (excited) beam densities in current experiments, and the reliability of these data will be crucial to obtain helium ash densities on ITER combining charge exchange and beam emission spectroscopy. Good agreement between the different CR models for the neutral beam (NB) is found, if corrections to the fundamental cross sections are taken into account. First the H-alpha and H-beta beam emission spectra from JET are compared with the expected intensities. Second, the line ratios within the Stark multiplet are compared with the predictions of a sublevel resolved model. The measured intensity of the full multiplet is approximate to 30% lower than expected on the basis of beam attenuation codes and the updated beam emission rates, but apart from the atomic data this could also be due to the characterization of the NB path and line of sight integration and the absolute calibration of the optics. The modelled n = 3 to n = 4 population agrees very well with the ratio of the measured H-alpha to H-beta beam emission intensities. Good agreement is found as well between the NB power fractions measured with beam emission in plasma and on the JET Neutral Beam Test Bed. The Stark line ratios and sigma/pi intensity ratio deviate from a statistical distribution, in agreement with the CR model in parabolic states from Marchuk et al (2010 J. Phys. B: At. Mol. Opt. Phys. 43 011002).

URL<Go to ISI>://000284406600058
Division

Fusion Physics

PID

d1ed77a887c199d6eef41840c741d500

Alternate TitlePlasma Phys. Control. Fusion

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