Community Research and Development Information Service - CORDIS


The potential of helium spectroscopy for quasicontinuous electron temperature profile measurements in the boundary layer of a tokamak plasma is tested. For the production of a plasma with parameters close to that of a tokamak boundary layer the PISCES-B facility was used, where plasmas with up to T(e) values of approximately 30 eV simultaneously with n(e) values of approximately 5 x 1.0 E12/cm3 could be obtained. T(e) and n(e) profiles were determined both by fixed and reciprocating Langmuir probes. The helium was injected into the central part of an argon plasma, and its spectral line emission in the visible was measured by means of an OMA attached to an optical spectrometer. Six triplet and six singlet emission lines of HeI were measured and the ratio of these, which is assumed to be a function of T(e), evaluated for a range of temperatures and densities. From their absolute intensities, the individual line excitation rates could be derived as a function of electron temperature.

Additional information

Authors: POSPIESZCZYK A ET AL., Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: Nuclear Instruments and Methods in Physics Research, Vol. B72 (1992), pp. 207-223
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top