OEDGE modeling of the DIII-D H-mode 13CH4 puffing experiment

JOURNAL OF NUCLEAR MATERIALS

卷:363

Article; Proceedings Paper

Elder, J. D. ; McLean, A. G. ; Stangeby, P. C. ; Allen, S. L. ; Boedo, J. A. ; Bray, B. D. ; Brooks, N. H. ; Fenstermacher, M. E. ; Groth, M. ; Leonard, A. W. ; Reiter, D. ; Rudakov, D. L. ; Wampler, W. R. ; Watkins, J. G. ; West, W. P. ; Whyte, D. G.

关键词: carbon impurities;    DIII-D;    edge modeling;    impurity transport;    OEDGE;   

DOI  :  10.1016/j.jnucmat.2007.01.004

来源: Elsevier

【 摘 要 】

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 (CH4)-C-13 was puffed into the main vessel through the toroidaly symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the C-13 content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. The C-13 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 similar to 0.3 toward the inner divertor and a radial pinch similar to 10-20 m/s (+R-direction) were found to yield C-13 deposition comparable to the experiment. (c) 2007 Elsevier B.V. All rights reserved.

【 授权许可】

Free