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 inter- action based on the NSTX-U setup. An overview of different divertor con gurations 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:
-
- Univ. of Wisconsin, Madison, WI (United States)
- General Atomics, San Diego, CA (United States)
- Max Planck Inst. for Plasma Physics, Greifswald (Germany)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1399721
- Alternate Identifier(s):
- OSTI ID: 1259743
- Report Number(s):
- LLNL-JRNL-739361
Journal ID: ISSN 1070-664X; TRN: US1702971
- Grant/Contract Number:
- AC52-07NA27344; FC02-04ER54698; SC0012315
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION
Citation Formats
Frerichs, H., Schmitz, O., Waters, I., 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:10.1063/1.4954816.
Frerichs, H., Schmitz, O., Waters, I., 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. https://doi.org/10.1063/1.4954816
Frerichs, H., Schmitz, O., Waters, I., 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. https://doi.org/10.1063/1.4954816. https://www.osti.gov/servlets/purl/1399721.
@article{osti_1399721,
title = {Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U},
author = {Frerichs, H. and Schmitz, O. and Waters, I. 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 inter- action based on the NSTX-U setup. An overview of different divertor con gurations 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 = {10.1063/1.4954816},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = {2016},
month = {6}
}
Web of Science
Figures / Tables:

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Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
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- Frerichs, H.; Waters, I.; Schmitz, O.
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Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
dataset, January 2016
- Frerichs, H.; Waters, I.; Schmitz, O.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
dataset, January 2016
- Frerichs, H.; Waters, I.; Schmitz, O.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Magnetic Geometry and Physics of Advanced Divertors: The X-Divertor and the Snowflake
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Works referencing / citing this record:
Field aligned flows driven by neutral puffing at MAST
journal, April 2018
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Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
dataset, January 2016
- Frerichs, H.; Waters, I.; Schmitz, O.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U
dataset, January 2016
- Frerichs, H.; Waters, I.; Schmitz, O.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)