Error fields in the Wendelstein 7-X stellarator
Abstract
The role of error fields in stellarators is explored in this work through simulations of, and experiments performed on, the Wendelstein 7-X (W7-X) stellarator. Previous experimental results, based on limiter plasmas in W7-X, suggest that error fields are small in the experiment based on limiter plasmas. In this work, we document results from the first divertor campaign on W7-X with a focus on error fields resonant with the edge island divertor structure. Measurements obtained using divertor thermocouples corroborate earlier limiter results that the error fields are small and correctable, requiring only 5% of the total rated current of the trim coil system. The effect of these error fields on magnetic geometry and topology are investigated using the flux surface measurement technique. The resulting divertor thermal load asymmetry is modeled via field line diffusion and compared to experimental data.
- Authors:
-
[1];
[2];
[3];
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Max-Planck Inst. für Plasmaphysik, Greifswald (Germany)
- Univ. of Cagliari, Cagliari (Italy)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- W7-X Team
- OSTI Identifier:
- 1484166
- Grant/Contract Number:
- AC02-09CH11466; 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 12; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Lazerson, Samuel A., Bozhenkov, Sergey, Israeli, Ben, Otte, Matthias, Niemann, Holger, Bykov, Victor, Endler, Michael, Andreeva, Tamara, Ali, Adnan, Drewelow, Peter, Jakubowski, Marcin, Sitjes, Aleix Puig, Pisano, Fabio, and Cannas, Barbara. Error fields in the Wendelstein 7-X stellarator. United States: N. p., 2018.
Web. doi:10.1088/1361-6587/aae96b.
Lazerson, Samuel A., Bozhenkov, Sergey, Israeli, Ben, Otte, Matthias, Niemann, Holger, Bykov, Victor, Endler, Michael, Andreeva, Tamara, Ali, Adnan, Drewelow, Peter, Jakubowski, Marcin, Sitjes, Aleix Puig, Pisano, Fabio, & Cannas, Barbara. Error fields in the Wendelstein 7-X stellarator. United States. https://doi.org/10.1088/1361-6587/aae96b
Lazerson, Samuel A., Bozhenkov, Sergey, Israeli, Ben, Otte, Matthias, Niemann, Holger, Bykov, Victor, Endler, Michael, Andreeva, Tamara, Ali, Adnan, Drewelow, Peter, Jakubowski, Marcin, Sitjes, Aleix Puig, Pisano, Fabio, and Cannas, Barbara. Fri .
"Error fields in the Wendelstein 7-X stellarator". United States. https://doi.org/10.1088/1361-6587/aae96b. https://www.osti.gov/servlets/purl/1484166.
@article{osti_1484166,
title = {Error fields in the Wendelstein 7-X stellarator},
author = {Lazerson, Samuel A. and Bozhenkov, Sergey and Israeli, Ben and Otte, Matthias and Niemann, Holger and Bykov, Victor and Endler, Michael and Andreeva, Tamara and Ali, Adnan and Drewelow, Peter and Jakubowski, Marcin and Sitjes, Aleix Puig and Pisano, Fabio and Cannas, Barbara},
abstractNote = {The role of error fields in stellarators is explored in this work through simulations of, and experiments performed on, the Wendelstein 7-X (W7-X) stellarator. Previous experimental results, based on limiter plasmas in W7-X, suggest that error fields are small in the experiment based on limiter plasmas. In this work, we document results from the first divertor campaign on W7-X with a focus on error fields resonant with the edge island divertor structure. Measurements obtained using divertor thermocouples corroborate earlier limiter results that the error fields are small and correctable, requiring only 5% of the total rated current of the trim coil system. The effect of these error fields on magnetic geometry and topology are investigated using the flux surface measurement technique. The resulting divertor thermal load asymmetry is modeled via field line diffusion and compared to experimental data.},
doi = {10.1088/1361-6587/aae96b},
journal = {Plasma Physics and Controlled Fusion},
number = 12,
volume = 60,
place = {United States},
year = {Fri Nov 09 00:00:00 EST 2018},
month = {Fri Nov 09 00:00:00 EST 2018}
}
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Works referencing / citing this record:
Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase
journal, August 2019
- Wolf, R. C.; Alonso, A.; Äkäslompolo, S.
- Physics of Plasmas, Vol. 26, Issue 8
Measurements and correction of the 1/1 error field in Wendelstein 7-X
journal, December 2018
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- Nuclear Fusion, Vol. 59, Issue 2
Measurement and modeling of magnetic configurations to mimic overload scenarios in the W7-X stellarator
journal, May 2019
- Lore, J. D.; Gao, Y.; Geiger, J.
- Nuclear Fusion, Vol. 59, Issue 6
First divertor physics studies in Wendelstein 7-X
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Effects of toroidal plasma current on divertor power depositions on Wendelstein 7-X
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First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X
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