Verlag des Forschungszentrums Jülich
JUEL-4229
Dauwe, Alexander; Tytgadt, Michael; Reiter, Detlev; Baelmans, Martine
Automatic reduction of the hydrocarbon reaction mechanisms in fusion edge plasmas
130 S., 2006
For predictions of the tritium inventory in future fusion devices like ITER, the amount of
eroded carbon and the hydrogen concentrations in co-deposited hydrocarbon layers have to be
predicted quantitatively. Predictions about the locations of co-deposited layers are also necessary
in order to design deposition diagnostics and layer removal methods. This requires a
detailed physical understanding of the erosion and carbon migration processes, and computer
simulations. For accurate simulation the multi-species code EIRENE would require to include
over 50 participating species. Because such a calculation is computationally prohibitive current
codes are being reduced, typically in an ad hoc fashion. In this work the potential of the
mathematically sound method of intrinsic low dimensional manifolds (ILDM) for computational
speed-up of the hydrocarbon transport problem simulation is thoroughly investigated. It
is basically the Monte Carlo implementation of EIRENE that makes this task so challenging.
As the method can substantially ameliorate the results in comparison to the conventional
reduction mechanisms a step towards ILDM-reduced kinetics is conceived and tested.
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