Erosion/Deposition Issues at JET

By J. Coad, N. Bekris, J. Elder, S. Erents, D. Hole, K. Lawson, G. Matthews, R. Penzhorn, P. Stangeby. 2001

199 citations recorded by the source corpus.

Deposition and H-isotope retention in JET is highly asymmetric, with deposition predominantly in the inner divertor, where flaking deposits form on water-cooled louvres shadowed from the plasma. The asymmetry implies drift in the SOL of JET from outboard to inboard under normal operating conditions, which has been measured. In order to model the amounts of deposition, assumptions have to be made about the transport at the inner target. Analysis of divertor tiles shows that material from the main chamber travels along the SOL to the inner divertor wall, from where carbon is preferentially removed leaving a beryllium-rich film. The carbon travels to shadowed areas (such as the louvres) where deposits with high H-isotope content accrue. The analysis indicates that chemical processes must be important.

Subfields: Materials Chemistry, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e840bb7125befe39e443e8b3e61f3ae3715c25b5

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Citations in the corpus

• Disruption heat loads on the JET MkIIGB divertor (2002, background): “The presence of the layer is not just a numerical trick, it has been observed both on MkIIa and on MkIIGB [3].”