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(EXP3/14) Plasma-Wall Interactions in RFX

M. Valisa, R. Bartiromo, L. Carraro, S. Costa, G. De Pol, R. Pasqualotto¹, R. Pugno¹, M. E. Puiatti, F. Sattin¹, P. Scarin, P. Sonato, G. Telesca, P. Zaccaria

Consorzio RFX, Corso Stati Uniti, 4-35127 Padova, Italy
¹ These authors are also members of INFM, Unità di Padova

Abstract.   Plasma wall interactions become a crucial issue in the Reversed Field Pinch RFX at high current (>0.7 MA). Wall-Mode Locking (WML) leads to carbon bloom, enhanced recycling and makes the density control very difficult to achieve. Several wall conditioning techniques have improved the capability of controlling recycling, especially boronisation with diborane, but at 1 MA of plasma current removal of the WML becomes mandatory. Encouraging results have been achieved by rotating an externally induced perturbation that can unlock the WML. The strong impurity screening mechanism found at intermediate current does not degrade significantly at 1 MA. Modification of the tiles geometry could further reduce the power density dissipation and mitigate the PWI.

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