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Experiments have been carried out in the TEXTOR tokamak to investigate the performance of the pump limiter ALT-II at the highest achievable core densities. Neutral beam heating allows the density to be extended beyond the ohmic limit. The use of one beam raises the line-averaged density limit by approximately 50 %. Results from discharges with co- and balanced injection are shown. Plasma fluxes to the pump limiter increase with density. Up to 4.5 x 1.0 E21 ions/s (720 A) are collected in the eight segment belt, with pumped particle fluxes of up to 3 x 1.0 E21 atoms/s (60 mbar.l/s). Exhaust efficiency, which can be estimated from SOL profiles and from D(alpha) emission, increases with density. Experimental results are discussed in terms of predictions from the neutral transport code EIRENE.

Additional information

Authors: GRAY D S ET AL., University of California in Los Angeles, Institute of Plasma and Fusion Research, Department of Mechanical, Aerospace and Nuclear Engineering (US);DIPPEL K H ET AL., Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 196-198 (1992) pp. 1096-1100
Record Number: 199310274 / Last updated on: 1994-11-29
Original language: en
Available languages: en