Effect of error field correction coils on W7-X limiter loads
Abstract
In the first campaign Wendelstein 7-X was operated with five poloidal graphite limiters installed stellarator symmetrically. In an ideal situation the power losses would be equally distributed between the limiters. The limiter shape was designed to smoothly distribute the heat flux over two strike lines. Vertically the strike lines are not uniform because of different connection lengths. In this paper it is demonstrated both numerically and experimentally that the heat flux distribution can be significantly changed by non-resonant $n=1$ perturbation field of the order of $$10^{-4}$$ . Numerical studies are performed with field line tracing. In experiments perturbation fields are excited with five error field trim coils. The limiters are diagnosed with infrared cameras, neutral gas pressure gauges, thermocouples and spectroscopic diagnostics. Experimental results are qualitatively consistent with the simulations. With a suitable choice of the phase and amplitude of the perturbation a more symmetric plasma-limiter interaction can be potentially achieved. Finally, these results are also of interest for the later W7-X divertor operation.
- Authors:
-
[2];
[3];
- Max-Planck-Institut fur Plasmaphysik, Greifswald (Germany)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Wigner Institute, Budapest (Hungary)
- Univ. of Cagliari (Italy)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- EUROfusion Consortiumand has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053.; USDOE
- Contributing Org.:
- W7-X Team
- OSTI Identifier:
- 1466524
- Grant/Contract Number:
- 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 57; Journal Issue: 12; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Wendelstein 7-X; limiter; limiter symmetry; error fields; stellarator fields
Citation Formats
Bozhenkov, Sergey A., Jakubowski, M. W., Niemann, H., Lazerson, S. A., Wurden, G. A., Biedermann, C., Kocsis, G., König, R., Pisano, F., Stephey, L., Szepesi, T., Wenzel, U., Pedersen, T. S., and Wolf, R. C. Effect of error field correction coils on W7-X limiter loads. United States: N. p., 2017.
Web. doi:10.1088/1741-4326/aa85ce.
Bozhenkov, Sergey A., Jakubowski, M. W., Niemann, H., Lazerson, S. A., Wurden, G. A., Biedermann, C., Kocsis, G., König, R., Pisano, F., Stephey, L., Szepesi, T., Wenzel, U., Pedersen, T. S., & Wolf, R. C. Effect of error field correction coils on W7-X limiter loads. United States. https://doi.org/10.1088/1741-4326/aa85ce
Bozhenkov, Sergey A., Jakubowski, M. W., Niemann, H., Lazerson, S. A., Wurden, G. A., Biedermann, C., Kocsis, G., König, R., Pisano, F., Stephey, L., Szepesi, T., Wenzel, U., Pedersen, T. S., and Wolf, R. C. Wed .
"Effect of error field correction coils on W7-X limiter loads". United States. https://doi.org/10.1088/1741-4326/aa85ce. https://www.osti.gov/servlets/purl/1466524.
@article{osti_1466524,
title = {Effect of error field correction coils on W7-X limiter loads},
author = {Bozhenkov, Sergey A. and Jakubowski, M. W. and Niemann, H. and Lazerson, S. A. and Wurden, G. A. and Biedermann, C. and Kocsis, G. and König, R. and Pisano, F. and Stephey, L. and Szepesi, T. and Wenzel, U. and Pedersen, T. S. and Wolf, R. C.},
abstractNote = {In the first campaign Wendelstein 7-X was operated with five poloidal graphite limiters installed stellarator symmetrically. In an ideal situation the power losses would be equally distributed between the limiters. The limiter shape was designed to smoothly distribute the heat flux over two strike lines. Vertically the strike lines are not uniform because of different connection lengths. In this paper it is demonstrated both numerically and experimentally that the heat flux distribution can be significantly changed by non-resonant $n=1$ perturbation field of the order of $10^{-4}$ . Numerical studies are performed with field line tracing. In experiments perturbation fields are excited with five error field trim coils. The limiters are diagnosed with infrared cameras, neutral gas pressure gauges, thermocouples and spectroscopic diagnostics. Experimental results are qualitatively consistent with the simulations. With a suitable choice of the phase and amplitude of the perturbation a more symmetric plasma-limiter interaction can be potentially achieved. Finally, these results are also of interest for the later W7-X divertor operation.},
doi = {10.1088/1741-4326/aa85ce},
journal = {Nuclear Fusion},
number = 12,
volume = 57,
place = {United States},
year = {Wed Sep 27 00:00:00 EDT 2017},
month = {Wed Sep 27 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Magnetic configuration effects on the Wendelstein 7-X stellarator
journal, May 2018
- Dinklage, A.; Beidler, C. D.; Helander, P.
- Nature Physics, Vol. 14, Issue 8
Wall conditioning by ECRH discharges and He-GDC in the limiter phase of Wendelstein 7-X
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Methods for quantitative study of divertor heat loads on W7-X
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Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters
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Magnetic configuration effects on the edge heat flux in the limiter plasma on W7-X measured using the infrared camera and the combined probe
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