Compatibility of the radiating divertor with high performance plasmas in DIII-D

JOURNAL OF NUCLEAR MATERIALS

卷:363

Article; Proceedings Paper

Petrie, T. W. ; Wade, M. R. ; Brooks, N. H. ; Fenstermacher, M. E. ; Groth, M. ; Hyatt, A. W. ; Isler, R. C. ; Lasnier, C. J. ; Leonard, A. W. ; Mahdavi, M. A. ; Porter, G. D. ; Schaffer, M. J. ; Watkins, J. G. ; West, W. P. ; Team, DIII-D

关键词: argon;    divertor;    divertor plasma;    impurity screening;    DIII-D;   

DOI  :  10.1016/j.jnucmat.2007.01.131

来源: Elsevier

【 摘 要 】

A radiating divertor approach was successfully applied to high performance 'hybrid' plasmas [M.R. Wade et al., in: Proceedings of the 20th IAEA Fusion Energy Conference, Vilamoura, Portugal, 2004]. Our techniques included: (1) injecting argon near the outer divertor target, (2) enhancing the plasma flow into the inner and outer divertors by a combination of particle pumping and deuterium gas puffing upstream of the divertor targets, and (3) isolating the inner divertor from the outer by a structure in the private flux region. Good hybrid conditions were maintained, as the peak heat flux at the outer divertor target was reduced by a factor of 2.5; the peak heat flux at the inner target decreased by 20%. This difference was caused by a higher concentration of argon at the outer target than at the inner target. Argon accumulation in the main plasma was modest (n(Ar)/n(e) <= 0.004 on axis), although the argon profile was more peaked than the electron profile. (c) 2007 Elsevier B.V. All rights reserved.

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