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

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1366498
DOE Contract Number:  
AC02-09CH11466
Resource Type:
Data
Resource Relation:
Related Information: Physics of Plasmas, Vol. 23, p. 062517 (June 2016)
Data Type:
Figures/Plots
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Edge plasma modeling; Advanced Divertors; NSTX-U

Citation Formats

Frerichs, H., Waters, I., Schmitz, O., Canal, G. P., Evans, T. E., Feng, Y., and Soukhanovskii, V. A. Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U. United States: N. p., 2016. Web. doi:10.11578/1366498.
Frerichs, H., Waters, I., Schmitz, O., Canal, G. P., Evans, T. E., Feng, Y., & Soukhanovskii, V. A. Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U. United States. doi:10.11578/1366498.
Frerichs, H., Waters, I., Schmitz, O., Canal, G. P., Evans, T. E., Feng, Y., and Soukhanovskii, V. A. Wed . "Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U". United States. doi:10.11578/1366498. https://www.osti.gov/servlets/purl/1366498.
@article{osti_1366498,
title = {Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U},
author = {Frerichs, H. and Waters, I. and Schmitz, O. and Canal, G. P. and Evans, T. E. and Feng, Y. and Soukhanovskii, V. A.},
abstractNote = {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.},
doi = {10.11578/1366498},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}

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Works referencing / citing this record:

Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
journal, June 2016

  • Frerichs, H.; Schmitz, O.; Waters, I.
  • Physics of Plasmas, Vol. 23, Issue 6, Article No. 062517
  • DOI: 10.1063/1.4954816