Progress in Understanding Halo Current at JET

The poloidal distribution of the halo current density on the top dump plate in JET can now be measured thanks to a new set of Rogowskii coils. Although the interpretation of the measurements is still on-going, from the analysis so far it can be concluded that, during upward events, the measured current density is qualitatively consistent with the measured total poloidal current, the halo footprint extends over most of the upper dump plate and the observed halo current pattern is consistent with the measured heat flux.
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EFDC080503 1.74 Mb