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Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp0105741v14g
 Title: Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U Contributors: Frerichs, H.Waters, I.Schmitz, O.Canal, G.P.Evans, T.E.Feng, Y.Soukhanovskii, V.A.U. S. Department of Energy contract number DE-AC02-09CH11466 Keywords: Edge plasma modelingAdvanced DivertorsNSTX-U Issue Date: Jun-2016 Publisher: Princeton Plasma Physics Laboratory, Princeton University Related Publication: Physics of Plasmas, Vol. 23, p. 062517 (June 2016) Abstract: 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 (transients), but understanding their detailed impact is difficult due to their symmetry breaking nature. One approach for reducing steady state heat loads are 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 is 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. URI: http://arks.princeton.edu/ark:/88435/dsp0105741v14g Referenced By: http://dx.doi.org/10.1063/1.4954816 Appears in Collections: NSTX-U

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