Comparison of B2-EIRENE calculations with multi-machine experimental measurements

The B2-EIRENE code has been compared with plasma edge measurements from Alc ator C-MOD, DIII-D, JET, JT-60U in L-mode and H-mode regimes. Similarities in L-mode discharges between JET and JT-60U are well. reproduced by the cod e as well as the sudden approach to detachment seen in JT-60U when a 1% che mical sputtering yield for carbon is assumed. Comparisons between similar L -mode regimes in JET, JT-60U and Alcator C-MOD reveal the larger importance of anomalous energy convection in Alcator C-MOD with regard to larger toka maks. H-mode discharges of DIII-D and JET can be satisfactorily modelled wi th similar values of the transport coefficients (approximately an order mag nitude smaller than in L-mode) when the power flow into the scrape-off laye r (SOL) is dominated by the ion channel, as previous EDGE2D simulations for JET suggested. (C) 1999 Elsevier Science B.V. All rights reserved.