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A database of rate coefficients for CH(4) is compared with experiments on PISCES-A, to understand the role of carbon-based impurities in determining the fuelling profile of carbon-dominated machines. A three-dimensional Monte Carlo model that embodies the Ehrhardt-Langer CH(4) breakup scheme has been developed. The model has been compared with spectroscopic observations of the spatial variation of the hydrocarbon product decay rates, and reasonable agreement has been found. The comparison is sensitive to the non-Maxwellian electron distribution and to observed spatial inhomogeneities in the electron density and temperature profiles. Applications of the model to parameters characteristic of the tokamak scrape-off layer are presented.

Additional information

Authors: HOGAN J T, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);POSPIESZCZYK A, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Report: ORNL/TM-11542 EN (1990) 18 pp.
Availability: Available from Oak Ridge National Laboratory, Oak Ridge, Tennessee (US)
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