Sensitivity Studies of Power Deposition Computed on Tokamak First Wall

Profiles of power deposition on the first wall of the Joint European Torus (JET) tokamak experiment are fit by tracing an analytic representation for the distribution of power from midplane along lines of magnetic field. The technique is used to help design plasma-facing components (PFCs) in reactor-scale magnetic confinement devices; hence, understanding how to employ it both efficiently and accurately is important. Focusing on JET divertor geometry, the work examines the sensitivity of the integrated power and maximum power per PFC tile to the representation of the magnetic field and to the discretization of the tile’s own geometry and that of other PFCs. For design, it is helpful to reduce computation costs per realization to a few seconds of elapsed time, and the work concludes with recommendations and guidelines for minimizing cost while retaining adequate accuracy.