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At the tokamak ASDEX, a method was developed to determine time resolved ion temperature profiles in the plasma edge. This investigation aims at improving this method in the geometry of W7-AS.

To measure the necessary CX-spectra the diagnosis LENA was used. A channel plate detector allows better absolute measurements. By comparing the spectrum of LENA with a numerically simulated CX-spectrum the ion temperatures are determined. The simulation of the neutral particle density in the plasma is necessary. Two models were used and showed good agreement. Different discharges were investigated. The temperature profiles showed good agreement with the ones measured by CXRS and NPA. An investigation on a density variation shows the advantage of the time resolving of this method. .

Additional information

Authors: ERNST B, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPPIII/227 DE (1997) 86pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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