The impact of the ITER-like wall at JET on disruptions
- 21 November 2012
- journal article
- conference paper
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 54 (12)
- https://doi.org/10.1088/0741-3335/54/12/124032
Abstract
The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.Keywords
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