EFDA-JET-CP(07)03/04
Numerical Simulations of Recycling Impurity Screening on JET
In JET experiments using extrinsic impurity seeding, it was observed that the plasma core contamination and subsequent radiative collapse could be avoided if the deuterium gas inlet level was above a certain level for high triangularity type I ELMy H-mode plasmas. Originally these experiments were modelled using the 1.5D core transport code JETTO/SANCO and the 2D SOL transport code EDGE2D/NIMBUS. In this paper we will use the COCONUT code that couples both transport codes by exchanging the boundary conditions between these two codes in every time step.