Bochum 2002 – wissenschaftliches Programm
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P: Plasmaphysik
P 22: Poster: Magnetische Fusion, Plasmadiagnostik, Dichte Plasmen
P 22.1: Poster
Dienstag, 19. März 2002, 17:40–18:40, HZO Foyer
First approach for a HFS-pellet penetration scaling at ASDEX Upgrade (AUG) — •M. Reich1, P.T. Lang1, V. Mertens1, H.W. Müller1, J. Neuhauser1, K.F. Renk2, and ASDEX Upgrade Team1 — 1Max Planck Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching — 2Institut für Experimentelle und Angewandte Physik, NWF II, Universität, D-93053 Regensburg
Cryogenic hydrogen pellet injection for refueling a tokamak fusion device from the magnetic high field side (HFS) is an advanced technique capable of extending the accessible operational area. Higher pellet speeds are helpful for achieving better refueling performance by deeper penetration and deposition. While these results are qualitatively unambiguous, there is a problem of quantitative extrapolation to new scenarios. In order to predict the effects of pellet parameter variation (speed, size, doping) on refueling of a next generation tokamak such as ITER, it is essential to adequately predict variables like penetration depth and mass deposition. For the injection of pellets from the low field side (LFS) an effort has been made by L. Baylor et al. to generate a database of pellet ablation parameters in a multi-machine study (IPAD). An empirical scaling for the penetration depth could be established. Although all major tokamak experiments either switched to or added HFS-pellet injection after discovery of the immediate improvements, no such database exists for HFS-pellets yet. It is in principle possible to apply the same method to the data acquired by injection of HFS-pellets as was used to create the IPAD-scaling. First results from such a database for HFS-pellets at AUG, already with a broad parameter range, are presented.