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 Reiter، نويسنده , , D. 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 :
Use of carbon in tokamaks leads to a serious tritium retention issue due to co-deposition. To further investigate the processes involved, a detached ELMy H-mode (6.5 MW NBI) experiment was performed on DIII-D in which 13CH4 was puffed into the main vessel through the toroidaly symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the 13C content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. The 13C deposition pattern could be reproduced, in general shape and magnitude, by assuming in the code the existence of a parallel flow and a radial pinch in the scrape-off layer. Parallel flows of Mach ∼0.3 toward the inner divertor and a radial pinch ∼10–20 m/s (+R-direction) were found to yield 13C deposition comparable to the experiment.
Keywords :
Edge modeling , DIII-D , OEDGE , Impurity transport , Carbon impurities
