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

Frerichs, H.; Waters, I.; Schmitz, O.; Canal, G.P.; Evans, T.E.; Feng, Y.; Soukhanovskii, V.A.
Issue date: June 2016
Cite as:
Frerichs, H., Waters, I., Schmitz, O., Canal, G.P., Evans, T.E., Feng, Y., & Soukhanovskii, V.A. (2016). Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Frerichs, H. and
                Waters, I. and
                Schmitz, O. and
                Canal, G.P. and
                Evans, T.E. and
                Feng, Y. and
                Soukhanovskii, V.A.},
  title       = {{Exploration of magnetic perturbation eff
                ects on advanced divertor configurations
                 in NSTX-U}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2016

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.

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# Filename Description Filesize
1 ARK_DATA.zip 69.5 MB
2 readme.txt 2.76 KB