Overview of the Results on Divertor Heat Loads in RMP Controlled H-mode Plasmas on DIII-D

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

doi:10.1088/0029-5515/49/9/095013

Title: Overview of the Results on Divertor Heat Loads in RMP Controlled H-mode Plasmas on DIII-D

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/49/9/095013· OSTI ID:1038509

Jakubowski, M W ^[1]; Evans, T E ^[2]; Fenstermacher, M E ^[3]; Groth, M ^[3]; Lasnier, C J ^[3]; Leonard, A W ^[4]; Schmitz, O ^[5]; Watkins, J G ^[6]; Elch, T ^[7]; Fundamenski, W ^[8]; Moyer, R A ^[9]; Wolf, R C ^[1]; Baylor, L B ^[2]; Boedo, J A ^[9]; Burrell, K H ^[4]; Frerichs, H ^[5]; DeGrassie, J S ^[2]; Gohil, P ^[4]; Joseph, I ^[9]; Mordijck, S ^[2] more »

Max-Planck-Institute for Plasmaphysik, EURATOM-Association, Greifswald, Germany
General Atomics, San Diego
Lawrence Livermore National Laboratory (LLNL)
General Atomics
Forschungszentrum Julich, Julich, Germany
Sandia National Laboratories (SNL)
EURATOM / IPP Garching, Germany
EURATOM / UKAEA, UK
University of California, San Diego
University of California, Los Angeles
EURATOM / FZ-Juelich, Germany
Oak Ridge Institute for Science and Education (ORISE)

n 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 nu(e)*. We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high nu(e)* > 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: DE-AC05-00OR22725

OSTI ID:: 1038509

Journal Information:: Nuclear Fusion, Vol. 49, Issue 9

Country of Publication:: United States

Language:: English

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