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It is a major undertaking in reactor research to find a regime in which the energy containment is sufficient for ignition whilst ensuring that enough particles of helium and also of the neon added to cool the plasma edge are removed. For an understanding of helium exhaust (He pumping), locally resolved values for He concentration in the plasma core and edge are insufficient without partial pressure measurement of He in the pump channel. A way of measuring He in the presence of D(2) would be useful when searching for leaks. In this project, a helium partial pressure measurement technique using optical spectroscopy on a Penning discharge in the visible and vacuum ultraviolet spectral regions was tested in the laboratory and its potential for use in the TEXTOR tokamak assessed. The effect of CH(4) and CO on both measurement procedures was examined, as these gases can be formed when the plasma edge interacts with carbon-bearing components. This method also enables other gases such as neon to be observed. The VUV system has not yet been installed in TEXTOR.

Additional information

Authors: DENNER T, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Report: JÜL-3052 DE (1995) 91 pp.
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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