Non-statistical populations of magnetic sublevels of hydrogen beam atoms in fusion plasmas

TitleNon-statistical populations of magnetic sublevels of hydrogen beam atoms in fusion plasmas
Publication TypeJournal Article
Year of Publication2010
AuthorsO. Marchuk, Y. Ralchenko, R.K Janev, E. Delabie, W. Biel, A. Urnov
JournalNuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment
Date PublishedNov
Type of ArticleProceedings Paper
ISBN Number0168-9002
Accession NumberISI:000284343600023
Keywordscollisions, deuterium, Eikonal approximation, EMISSION, EXCITATION, EXCITED-STATE, FIELD, IMPACT, IONIZATION, Motional Stark effect, Parabolic states

Emission of spectral lines from the excited states of neutral beam atoms in fusion plasmas is the basis of beam emission spectroscopy and motional Stark effect diagnostics. It is well known that the measured intensities of Stark multiplet lines between the n=3 and 2 excited states of hydrogen systematically deviate from the full statistical model. Here we study the H-alpha Stark component intensities using a newly developed collisional-radiative model that is based on the description of magnetic sublevels in a parabolic basis. Proton excitation cross-sections between the parabolic states are calculated in the Glauber (eikonal) approximation. The model incorporates various collisional processes between the hydrogen beam atoms and plasma particles (protons, impurity ions and electrons) as well as the radiative processes. The simulated line component ratios sigma(1)/sigma(0), pi(2)/pi(3) and pi(4)/pi(3) are found to agree with the measured ratios from JET plasmas within the experimental uncertainties. (C) 2010 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000284343600023

Fusion Physics



Alternate TitleNucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.

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