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P: Fachverband Plasmaphysik

P 8: Plasmadiagnostik I

P 8.2: Vortrag

Mittwoch, 27. Februar 2013, 14:30–14:45, HS 2

Radial profiles of the neutral gas density and the effective transport coefficent from imaging X-ray spectroscopy — •Tobias Schlummer, Oleksandre Marchuk, Günter Bertschinger, Wolfgang Biel, and Detlev Reiter — Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Partner In the Trilateral Euregio Cluster, Jülich, Germany

X-Ray spectroscopy on seeded mid Z gases is a well established diagnostic for electron and ion-temperature measurements in controlled fusion plasmas. In the past few years the capabilities of X-ray spectroscopy expanded considerably. The use of bifocal crystals lead to compact designs and therefore to more flexible devices while the use of two dimensional CCD detector chips enabled radial resolution. Besides the plasma temperature these spectra also reveal certain ion ratios of the emitting element. These ion ratios are affected by charge exchange with neutral hydrogen and by impurity transport (1). Radially resolved spectra of He-like argon have been measured with the new compact imaging spectrometer for W7-X at TEXTOR. The argon ion ratios were interpreted with respect to charge exchange with a neutral gas background as well as radial impurity transport. Both effects are clearly distinguishable. This introduces imaging X-ray spectroscopy as diagnostic for radial profiles of the neutral gas density and the effective transport coefficient. (1) Bertschinger, Marchuk, High-Temp. Pl. Diag. by X-ray Spectr. in the Low Dens. Limit, Clark, Reiter (Eds.), Nuclear Fusion Research, Underst. Pl.-Surf. Interact. (Springer, 2004) p. 183