Aachen PK 2003 – scientific programme
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P: Plasmaphysik
P 17: Poster III
P 17.21: Poster
Thursday, March 20, 2003, 17:30–19:15, Foyer
Investigations on Spectroscopic Diagnostics for High-Z elements in Fusion Plasmas — •Thomas Pütterich1, Rudolf Neu1, Martin O’Mullane2, Allan Whiteford2, Ralph Dux1, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Garching, GERMANY — 2Department of Physics, University of Strathclyde, Glasgow, UK
The radiation emission and spatial distribution of high Z-materials will influence plasma performance for ITER. Relevant species include tungsten, originating from plasma facing components, and rare gases such as xenon. Diagnostic measurements on such species span from gross radiated power through to individual line emission. Their analysis presents theoretical problems of complexity and consistency, due to the many ionisation stages.
New extensions of ADAS (the Atomic Data and Analysis Structure) address these problems through ’ranging’ survey calculations, visualisation, definition of regions of interest, new data structures and condensing of very large scale computations to forms manageable by the analyst. Coupled with layers of data refinement, a modelling environment is provided which can both use benchmark studies, such as are possible on EBIT experiments, and enable comprehensive analysis of experiments.
The techniques are demonstrated by a study of W and Xe in VUV and X-ray measurements from ASDEX Upgrade. The distribution of ionisation stages modelled by STRAHL are matched to line-of-sight integrated spectra and total power. An initial assessment is made of sensitivity to accumulation and differential transport for such a high Z element.