Multi machine scaling of fuel retention in 4 carbon dominated tokamaks
E. Tsitrone, B. Pégourié, Y. Marandet, J. F. Artaud, C. Brosset, J. Bucalossi, Y. Corre, T. Dittmar, E. Gauthier, P. Languille, F. Linez, T. Loarerhttp://academic.research.microsoft.com/io.ashx?type=5&id=49090422&selfId1=0&selfId2=0&maxNumber=12&query=
In order to benchmark predictions for the in vessel tritium inventory in ITER, a survey of fuel retention measured in 4 carbon dominated tokamaks (TEXTOR, ASDEX Upgrade in the 2002–2003 carbon configuration, Tore Supra and JET) was performed, showing retention rates from ∼1g D/h in TEXTOR (L mode, limiter machine) up to ∼6–12g D/h in AUG (H mode, divertor machine). A simple scaling used for ITER predictions is applied for comparison with experimental values: (1) estimate of wall fluxes, (2) estimate of the gross carbon erosion, (3) estimate of the net erosion/redeposition assuming a redeposition fraction and (4) estimate of the retention rate using D/C ratio scalings. The validity of each step is discussed, showing that this approach yields the right order of magnitude, but tends to underestimate the experimental values unless a high wall flux, a low local redeposition fraction and/or a high D/C ratio are used.