Author/Authors :
Ekedahl، نويسنده , , A. and Bucalossi، نويسنده , , J. and Corre، نويسنده , , Y. and Delchambre، نويسنده , , E. and Dunand، نويسنده , , G. and Meyer، نويسنده , , O. and Mitteau، نويسنده , , R. and Monier-Garbet، نويسنده , , P. and Pégourié، نويسنده , , B. and Rimini، نويسنده , , F.G. and Saint-Laurent، نويسنده , , F. and Schwob، نويسنده , , J.L. and Tsitrone، نويسنده , , E.، نويسنده ,
Abstract :
The precursors and following sequential events leading to radiative disruptions in Tore Supra have been analysed using infrared imaging, together with visible and ultraviolet spectroscopy of impurity species. A common feature observed prior to the disruptions is the appearance of a small (∼cm2) hot spot on the main plasma facing component, the Toroidal Pumped Limiter (TPL), clearly localised in a zone of thick carbon re-deposition (>100 μm). A MARFE (Multifaceted Asymmetric Radiation From the Edge) is often triggered, followed by disruption. Such hot spots have been observed in ∼24% of the analysed disruptions, which is consistent with the fact that only 4/18 (22%) of the total area of the TPL is monitored with infrared cameras. These results suggest that over-heating of thick carbon re-deposition layers may play a role in the operational limits (MARFE, disruption) encountered.
