Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U

Frerichs, H.; Schmitz, O.; Waters, I.; Canal, G. P.; Evans, T. E.; Feng, Y.; Soukhanovskii, V. A.

doi:10.1063/1.4954816

Title: Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4954816· OSTI ID:22598940

Frerichs, H.; Schmitz, O.; Waters, I. ^[1]; Canal, G. P.; Evans, T. E. ^[2]; Feng, Y. ^[3]; Soukhanovskii, V. A. ^[4]

Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
General Atomics, San Diego, California 92186 (United States)
Max-Planck Institute for Plasma Physics, Greifswald (Germany)
Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

The control of divertor heat loads—both steady state and transient—remains a key challenge for the successful operation of ITER and FNSF. Magnetic perturbations provide a promising technique to control ELMs (Edge Localized Modes) (transients), but understanding their detailed impact is difficult due to their symmetry breaking nature. One approach for reducing steady state heat loads is so called “advanced divertors” which aim at optimizing the magnetic field configuration: the snowflake and the (super-)X-divertor. It is likely that both concepts—magnetic perturbations and advanced divertors—will have to work together, and we explore their interaction based on the NSTX-U setup. An overview of different divertor configurations under the impact of magnetic perturbations is presented, and the resulting impact on plasma edge transport is investigated with the EMC3-EIRENE code. Variations in size of the magnetic footprint of the perturbed separatrix are found, which are related to the level of flux expansion on the divertor target. Non-axisymmetric peaking of the heat flux related to the perturbed separatrix is found at the outer strike point, but only in locations where flux expansion is not too large.

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OSTI ID:: 22598940

Journal Information:: Physics of Plasmas, Vol. 23, Issue 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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AXIAL SYMMETRY
CONFIGURATION
CONTROL
DISTURBANCES
DIVERTORS
EDGE LOCALIZED MODES
EXPANSION
EXPLORATION
HEAT
HEAT FLUX
HEATING LOAD
ITER TOKAMAK
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MAGNETIC FIELDS
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