Error fields in the Wendelstein 7-X stellarator

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

doi:10.1088/1361-6587/aae96b

Error fields in the Wendelstein 7-X stellarator

Journal Article · Fri Nov 09 00:00:00 EST 2018 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aae96b· OSTI ID:1484166

^[1]; ^[2]; Israeli, Ben ^[1]; Otte, Matthias ^[2]; Niemann, Holger ^[2]; Bykov, Victor ^[2]; Endler, Michael ^[2]; Andreeva, Tamara ^[2]; Ali, Adnan ^[2]; Drewelow, Peter ^[2]; Jakubowski, Marcin ^[2]; Sitjes, Aleix Puig ^[2]; ^[3]; Cannas, Barbara ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max-Planck Inst. für Plasmaphysik, Greifswald (Germany)
Univ. of Cagliari, Cagliari (Italy)

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.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: W7-X Team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1484166

Alternate ID(s):: OSTI ID: 23001666

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 60; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase Wolf, R. C.; Alonso, A.; Äkäslompolo, S. Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5098761	journal	August 2019
Measurements and correction of the 1/1 error field in Wendelstein 7-X Bozhenkov, S. A.; Otte, M.; Biedermann, C. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf20c	journal	December 2018
Measurement and modeling of magnetic configurations to mimic overload scenarios in the W7-X stellarator Lore, J. D.; Gao, Y.; Geiger, J. Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab18d1	journal	May 2019
First divertor physics studies in Wendelstein 7-X Sunn Pedersen, T.; König, R.; Jakubowski, M. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab280f	journal	July 2019
Effects of toroidal plasma current on divertor power depositions on Wendelstein 7-X Gao, Yu; Geiger, Joachim; Jakubowski, Marcin W. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c2	journal	August 2019
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X Effenberg, F.; Brezinsek, S.; Feng, Y. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c4	journal	August 2019
Identification of important error fields in stellarators using the Hessian matrix method Zhu, Caoxiang; Gates, David A.; Hudson, Stuart R. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab3a7c	journal	September 2019
Neural network regression approaches to reconstruct properties of magnetic configuration from Wendelstein 7-X modeled heat load patterns Blatzheim, Marko; Böckenhoff, Daniel Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4123	journal	October 2019

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