Molecular contribution to the D alpha emission in the divertor of the ASDEX Upgrade experiment
2007 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 105, no 3, 425-437 p.Article in journal (Refereed) Published
Spectral line emission from the deuterium Balmer alpha line and from molecular deuterium in the Fulcher band, d(3)Pi(u)-> a(3)Sigma(+)(g), was studied in the outer divertor region of the ASDEX Upgrade plasma with a pair of relatively calibrated spectrometers. A dependence of the signals on the proximity of the plasma strike point and on divertor gas puffing was noted. The rotational spectrum of the lowest diagonal vibrational molecular bands indicated rotational temperatures of ca. 1000 K and hence, through calculation of relative upper state populations, a ground state vibrational temperature of ca. 4000 K. Calculating the particle fluxes, the molecular deuterium was found to contribute up to 1% of the D alpha intensity, the relative importance of the molecules at some divertor heights was affected by the position of the strike point.
Place, publisher, year, edition, pages
2007. Vol. 105, no 3, 425-437 p.
ASDEX Upgrade, Calibration, Deuterium molecules, Divertor spectroscopy
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-7656DOI: 10.1016/j.jqsrt.2006.12.004ISI: 000245564400006ScopusID: 2-s2.0-33847233592OAI: oai:DiVA.org:kth-7656DiVA: diva2:12751
QC 201008102007-11-202007-11-202011-12-16Bibliographically approved