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This report describes the use of the PISCES-A facility in order to study the behaviour of carbon containing molecules in a representative plasma with parameters close to those of a tokamak boundary layer. CH(4), C(2)H(2), C(2)H(4), CO, and CO(2) molecules are introduced through a slit aperture into a helium plasma and the radiation from these due to electronic excitation is spectrographically recorded. The imaging of the plasma onto the entrance slit of a 1.33 m McPherson optical spectrometer is chosen in such a way that simultaneous information about spectral and spatial distribution of the emission can be obtained by an attached photographic camera and an optical multichannel analyser. The recorded spectra show that many features in previously obtained spectra from limiters originate from hydrocarbons as well as from carbon oxides, which seem to play a major role in the transport of carbon and oxygen. It is also possible to calibrate the radiation intensity of several molecular bands against the known molecular influx so as to make the absolute determination of these fluxes from the wall of a fusion device possible. Measurements of the attenuation of individual species provide details of the penetration of carbon, oxygen and hydrogen atoms into a discharge by taking into account individual steps in the molecular breakup process.

Additional information

Authors: POSPIESZCZYK A, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);RA Y ET AL., University of California, Los Angeles (US)
Bibliographic Reference: Report: UCLA-PPG-1251 EN (1990) 64 pp.
Availability: Available from the Institute of Plasma and Fusion Research, University of California, Los Angeles (US)
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