Predictive ASCOT Modelling of 10Be Transport in JET with the ITER-Like Wall
We model the transport of a beryllium (10Be) marker during a sequence of an inner-wall limited and a diverted Ohmic plasma phase in JET with the objective of identifying principal migration pathways. The 3D orbit-following code ASCOT is used for predictive analysis of an experiment during the 2011-2012 campaign on JET where three central wall tile pieces enriched with 10Be were installed to an Inner Wall Guard Limiter (IWGL) of the tokamak. The simulations indicate that 10Be is distributed along the IWGLs during the limiter phase which, when assuming erosion, can lead to high deposition on the inner (high-field side) divertor during the diverted phase. In contrast, beryllium penetrating into core plasma during the limiter phase is seen to be predominantly uniformly deposited during the diverted phase on the outer (low-field side) wall limiters and divertor tiles.