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In TEXTOR, helium removal experiments with the pump limiter ALT-II have started. To simulate the presence of helium ash in the plasma, helium is injected into the discharge (e.g. at t=0.7s) as a short pulse of Dt = 20 ms. It is found that the He is removed from the discharge in an e-folding time of about half a second for neutral beam heated plasmas and in an e-folding time of about 1.5 s in an OH plasma. The exhaust efficiency of helium amounts to about 8% and is close to the one for deuterium. The fuelling efficiency for the injected helium is found to be in the range of 50-100%, and the remaining part seems to be stored in the TEXTOR walls. An estimate of the surface density leads to a value of several times 1.0 E13/cm2. This helium can easily be liberated in subsequent discharges and can be removed efficiently when ALT II is pumping.

Additional information

Authors: FINKEN K H ET AL., Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);HILLIS D L ET AL., Oak Ridge National Laboratory, Oak Ridge (US);MOYER R A ET AL., University of California, Institute of Plasma and Fusion Research, Los Angeles (US);AKAISHI K, National Institute for Fusion Science, Nagoya (JP);MIYAHARA A, National Institute for Fusion Science, Nagoya (JP);HULSE R A, Princeton University, Plasma Physics Laboratory, Princeton (US);SENGOKU S, JAERI, Department of Thermonuclear Fusion Research, Tokai (JP);WATKINS J G, Sandia National Laboratory, Albuquerque (US)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 816-820
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