Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D

M. W. Jakubowski, T. E. Evans, M. E. Fenstermacher, M. Groth, C. J. Lasnier, A. W. Leonard, O. Schmitz, J. G. Watkins, T. Eich, W. Fundamenski, R. A. Moyer, R. C. Wolf, L. B. Baylor, J. A. Boedo, K. H. Burrell, H. Frerichs, J. S. Degrassie, P. Gohil, I. Joseph, S. MordijckM. Lehnen, C. C. Petty, R. I. Pinsker, D. Reiter, T. L. Rhodes, U. Samm, M. J. Schaffer, P. B. Snyder, H. Stoschus, T. Osborne, B. Unterberg, E. Unterberg, W. P. West

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

128 Sitaatiot (Scopus)

Abstrakti

In this paper the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality . ν* We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high νe *> 0.5, the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. This is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.

AlkuperäiskieliEnglanti
Artikkeli095013
Sivut1-14
Sivumäärä14
JulkaisuNuclear Fusion
Vuosikerta49
Numero9
DOI - pysyväislinkit
TilaJulkaistu - 2009
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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