Error fields in the Wendelstein 7-X stellarator

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 plas...

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Bibliographic Details
Published in:Plasma Physics and Controlled Fusion
Main Authors: 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
Language:unknown
Published: 2023
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Edge Island
Online Access:http://www.osti.gov/servlets/purl/1484166
https://www.osti.gov/biblio/1484166
https://doi.org/10.1088/1361-6587/aae96b
Description
Summary: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.

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