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Abstract

Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarising electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarisation-induced H-mode. Since these results imply that a high He pumping efficiency may be necessary for H-mode burning plasmas, investigations have begun into He transport in a divertor H-mode. A collaborative programme has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of about 5 %. The time dependence of the He(2+) density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.

Additional information

Authors: HILLIS D L ET AL., Oak Ridge National Laboratory, Fusion Energy Division (US);FINKEN K H ET AL., Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);WEST W P ET AL., General Atomics, San Diego (US);WEYNANTS R R ET AL., Ecole Royale Militaire, Bruxelles (BE);WADE M R, Oak Ridge Associated Universities (US);AKAISHI K, National Institute for Fusion Science, Nagoya (JP);MIYAHARA A, National Institute for Fusion Science, Nagoya (JP);BOEDO J ET AL., University of California in Los Angeles, Institute of Plasma and Fusion Research (US);FINKENTHAL D, University of California, Department of Nuclear Engineering, Berkeley (US)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 196-198 (1992) pp. 35-44
Record Number: 199310272 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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