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(EXP3/09) Experimental Results on Pellet Injection and MHD from the RTP Tokamak

A. A. M. Oomens¹⁾, J. de Kloe¹⁾, F. J. B. Salzedas¹⁾, M. R. de Baar¹⁾, C. J. Barth¹⁾, M. N. A. Beurskens¹⁾, A. J. H. Donné¹⁾, B. de Groot¹⁾, G. M. D. Hogeweij¹⁾, F. A. Karelse¹⁾, O. G. Kruijt¹⁾, J. Lok¹⁾, N. J. Lopes Cardozo¹⁾, H. J. van der Meiden¹⁾, R. Meulenbroeks¹⁾, E. Noordermeer¹⁾, T. Oyevaar¹⁾, R. W. Polman¹⁾, F. C. Schüller¹⁾, E. Westerhof^1)
 
1) FOM-Instituut voor Plasmafysica `Rijnhuizen', Association EURATOM-FOM, Trilateral Euregio Cluster, Nieuwegein, The Netherlands

Abstract.  The ablation of hydrogen pellets has been studied in the Rijnhuizen Tokamak Project RTP with a diagnostic with high spatial and temporal resolution. It has been observed that (part of the) ablation cloud drifts away from the pellet in opposite direction. These drifts occur in semi-periodical bursts. A summary of a detailed analysis of this drift of the cloud and its implications for the fueling profile is presented. Stabilization of m/n = 2/1 tearing modes preceding density limit disruptions, has been studied with modulated and continuous ECRH. The results indicate that EC heating of the islands under these conditions is very inefficient. The time dependence of the growth rate of the precursor mode is first algebraic, but becomes exponential in a later phase.

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