Author/Authors :
Elder، نويسنده , , J.D. and McLean، نويسنده , , A.G. and Stangeby، نويسنده , , P.C. and Allen، نويسنده , , S.L. and Boedo، نويسنده , , J.A. and Bray، نويسنده , , B.D. and Brooks، نويسنده , , N.H. and Fenstermacher، نويسنده , , M.E. and Groth، نويسنده , , M. L. Leonard، نويسنده , , A.W. and Rudakov، نويسنده , , D.L. and Wampler، نويسنده , , W.R. and Watkins، نويسنده , , J.G. and West، نويسنده , , W.P. and Whyte، نويسنده , , D.G.، نويسنده ,
Abstract :
13C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed 13C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the 13C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10–30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.
