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Title: 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:
ORCiD logo [1]; ORCiD logo [2];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]; ORCiD logo [3];  [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Max-Planck Inst. für Plasmaphysik, Greifswald (Germany)
  3. Univ. of Cagliari, Cagliari (Italy)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
W7-X Team
OSTI Identifier:
1484166
Grant/Contract Number:  
AC02-09CH11466; 633053
Resource Type:
Journal Article: 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. 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, and Cannas, Barbara. Fri . "Error fields in the Wendelstein 7-X stellarator". United States. doi:10.1088/1361-6587/aae96b.
@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}
}

Journal Article:
Free Publicly Available Full Text
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