Aachen PK 2003 – scientific programme
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P: Plasmaphysik
P 10: Poster II
P 10.28: Poster
Tuesday, March 18, 2003, 17:30–19:15, Foyer
Hydrocarbons in the Divertor IIb of ASDEX Upgrade — •Bernd Heger1, R. Pugno1, A. Kirschner2, D. Coster1, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, EURATOM-Association, Garching, Germany — 2Forschungszentrum Jülich GmbH, EURATOM-Association, Jülich, Germany
In order to provide estimates for erosion of carbon in future fusion devices like ITER, which also influences tritium codeposition, the dependence of carbon erosion on plasma edge parameters is studied in divertor experiments with carbon targets. Therefore, spectroscopic measurements of hydrocarbon influxes from the targets are presented for the divertor IIb of ASDEX Upgrade. This is done for both L-mode and H-mode deuterium discharges using the so called photon efficiency (D/XB) method. For determination of methane fluxes the radiation of the CD (CH) molecule at 430 nm (A-X transition) is used. Using the radiation of the C2 molecule at 516 nm (Swan band) the ethane family, which also contributes to the CD (CH) radiation, can be addressed separately. By spectroscopic observation of localized gas puffs of CD4, CH4 and C2Hx the corresponding photon efficiencies are measured in situ and are applied to the intrinsic molecular radiation in order to derive intrinsic hydrocarbon influxes and gain information on the fragmentation. In order to take into account effects like recycling of the puffed hydrocarbons at the surfaces and for a better understanding of the underlying physics, the experimental results are compared with calculations from the ERO code. The corresponding background plasma of the ASDEX Upgrade divertor is provided by the B2-EIRENE code.