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Operation with the actively cooled inner first wall of Tore Supra shows that even such a large area limiter is subjected to anomalous heat deposition where the plasma contacts the limiter. This can be modelled by a parallel convective heat flux with an e-folding length of the order of a millimetre. In some extreme cases, associated with lower hybrid heating in a low-density plasma, the situation could degenerate into a runaway situation associated with large carbon influx into the discharge and ending with the rupture of elements. The analysis of the heat flux deposition on this limiter is complicated by the need to take shadowing effects into account, which are becoming significant because of the small-scale phenomenon involved. It is shown that only a small fraction of the front faces is wetted by the parallel heat flux and that very disparate heat fluxes co-exists on each element.

Additional information

Authors: HOGAN J, Oak Ridge National Laboratory, Fusion Energy Division, Oak Ridge, TN (US);MITTEAU R ET AL, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vol.290-293 (2001), pp.1036-1039
Record Number: 200113854 / Last updated on: 2001-10-05
Original language: en
Available languages: en
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