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Abstract

High-energy neutral Li-beam probes have advanced to the point where they are a standard diagnostic on W7-AS and ASDEX-Upgrade, both in terms of the Li-beam injector and the reconstruction algorithm to arrive at densities along the beam n(e)(z) from the Li[2p-2s] resonance line profile. With beam energies in the range 30-70 keV and netural equivalent currents of >1 mA, it is possible to produce n(e)(z) profiles for line densities n(e)(z) < 4E14 cm{-2} with a radial resolution of approximately 0.5 cm and time response < / = 0.2 msec. The Li-gun is described. By way of example, the diagnostic layout on W7-AS is sketched and salient results from experiment presented which serve to explore diagnostic limits and to underline the viability of the technique. Densities over the range < IE12 - 1E14 cm{-3} are accessible, permitting full coverage of the core density gradient region on W7-AS. Examples from ASDEX involving the H-mode and pellet injection are presented to exemplify time response. Scaling of SOL density e-folding lengths are introduced to point out possible differences between takamak (ASDEX, ASDEX-Up) and stellarator (W7-AS) transport behaviour perpendicular to field lines.

Additional information

Authors: MCCORMICK K, Max-Plank-Institut für Plasmaphysik, Garching bei München (DE);FIEDLER S, Max-Plank-Institut für Plasmaphysik, Garching bei München (DE);SCHWEINZER J, Max-Plank-Institut für Plasmaphysik, Garching bei München (DE);KOCSIS G, KFKI - Research Institute, Department of Plasma Physics, Bundapest (HU);ZOLETNIK S, KFKI - Research Institute, Department of Plasma Physics, Bundapest (HU)
Bibliographic Reference: Report: IPP III/211 EN (1996) 41pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199610637 / Last updated on: 1996-05-27
Category: PUBLICATION
Original language: en
Available languages: en
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