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Experiments demonstrating direct control of the He(2+) density in a tokamak plasma have been performed in the TEXTOR tokamak with the Advanced Limiter Test-II pump limiter. Helium is injected in a short gas puff from the outside of the plasma, is observed to reach the plasma core, and is then readily removed from the plasma (90 % of the He is removed in approximately 1 s). Active He pumping is found to be a valuable technique for discriminating the actual He confinement time from tau*(He). Active charge exchange spectroscopy is used to study the exhaust and transport of He(2+) within the plasma, and the density evolution is modelled with the diffusive/convective transport code, MIST.

Additional information

Authors: HILLIS D L ET AL., Oak Ridge National Laboratory, Fusion Energy Division, Tennessee (US);FINKEN K H ET AL., Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);MOYER R A ET AL., University of California, Institute of Plasma and Fusion Research (US);AKAISHI K ET AL., National Institute for Fusion Science, Nagoya (JP);BUDNY R I ET AL., Princeton University, Plasma Physics Laboratory (US)
Bibliographic Reference: Article: 13th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Proceedings, Vol. 3 (1991) pp. 597-604
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