Multi-X-point radiation and its dynamics in up/down asymmetry in plasma detachment regimes in Wendelstein 7-X Article Swipe
D. Zhang
,
G. Cseh
,
Y. Feng
,
Yu Gao
,
M. Jakubowski
,
T. Kremeyer
,
S. Draeger
,
F. Reimold
,
D. M. Kriete
,
Arun Pandey
,
G. Schlisio
,
G. Partesotti
,
V. Perseo
,
A. Alonso
,
C. Biedermann
,
S. Bozhenkov
,
C. Brandt
,
K. J. Brunner
,
R. Burhenn
,
B. Buttenschön
,
M. Endler
,
G. Fuchert
,
J. Geiger
,
L. Giannone
,
Victoria Haak
,
K. Hammond
,
M. Hirsch
,
J. Knauer
,
G. Kocsis
,
M. Krychowiak
,
R. König
,
R. Laube
,
D. Naujoks
,
M. Otte
,
F. Penzel
,
E. Pasch
,
K. Rahbarnia
,
T. Szepesi
,
H. Thomsen
,
U. Wenzel
,
V. Winters
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1088/1741-4326/adfc7d
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1088/1741-4326/adfc7d
In Wendelstein 7-X (W7-X), stable plasma detachment in ECRH hydrogen plasmas is routinely achieved with the standard magnetic configuration, containing five magnetic islands in the scrape-off layer (SOL). Plasma detachment induced by intrinsic carbon impurities is characterized by a high radiation fraction ( f rad ) with significantly reduced divertor heat load and particle flux. In this work, we present the radiation dynamics during the detached plasma (DP) phase, such as the shift of radiation zones in radial and poloidal directions towards the X-points as f rad increases (∼0.6–0.9), as well as the penetration of the radiation layer into the confinement region in the deep DP phase with f rad approaching unity. In particular, a structure of multi-X-point radiation (multi-XPR) with an up/down asymmetry in the DP phase is highlighted, which is revealed by bolometer tomography and is further confirmed by video diagnostics. The multi-XPR structure forms helical 3D bands aligned with W7-X field periodicity. Field reversal experiments show that the brightest XPR displaces between the upper and lower SOL regions, suggesting the E × B drift effects. This paper presents the multi-XPR structure observed in the W7-X plasma in detail for the first time. A simplified model considering the influence of the poloidal E × B drift ( V d ) on the impurity flow in the SOL shows that the downstream drift toward the target or target shadow region ( V d < 0) decreases the impurity content, while the upstream drift toward the LCFS ( V d > 0) increases the impurity content. On this basis, the poloidal drift potentially leads to an up/down asymmetry of impurity density in the SOL despite the symmetry magnetic topology. The dynamics of the up/down asymmetry in the multi-XPR structure is also related to the magnitude V d / D (normalized to the impurity diffusivity), with an additional effect owing to the radial inward shift of the emission zone. These results provide new insights into impurity-induced detachment dynamics and provide a basis for improving 3D modeling of impurity transport, which typically does not consider drifts.
Related Topics
Concepts
Wendelstein 7-X
Asymmetry
Plasma
Stellarator
Physics
Radiation
Ballooning
Point (geometry)
Computational physics
Atomic physics
Nuclear physics
Tokamak
Particle physics
Mathematics
Geometry
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1088/1741-4326/adfc7d
- OA Status
- diamond
- References
- 76
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4413304756
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4413304756Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.1088/1741-4326/adfc7dDigital Object Identifier
- Title
-
Multi-X-point radiation and its dynamics in up/down asymmetry in plasma detachment regimes in Wendelstein 7-XWork title
- Type
-
articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-08-18Full publication date if available
- Authors
-
D. Zhang, G. Cseh, Y. Feng, Yu Gao, M. Jakubowski, T. Kremeyer, S. Draeger, F. Reimold, D. M. Kriete, Arun Pandey, G. Schlisio, G. Partesotti, V. Perseo, A. Alonso, C. Biedermann, S. Bozhenkov, C. Brandt, K. J. Brunner, R. Burhenn, B. Buttenschön, M. Endler, G. Fuchert, J. Geiger, L. Giannone, Victoria Haak, K. Hammond, M. Hirsch, J. Knauer, G. Kocsis, M. Krychowiak, R. König, R. Laube, D. Naujoks, M. Otte, F. Penzel, E. Pasch, K. Rahbarnia, T. Szepesi, H. Thomsen, U. Wenzel, V. WintersList of authors in order
- Landing page
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https://doi.org/10.1088/1741-4326/adfc7dPublisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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diamondOpen access status per OpenAlex
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https://doi.org/10.1088/1741-4326/adfc7dDirect OA link when available
- Concepts
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Wendelstein 7-X, Asymmetry, Plasma, Stellarator, Physics, Radiation, Ballooning, Point (geometry), Computational physics, Atomic physics, Nuclear physics, Tokamak, Particle physics, Mathematics, GeometryTop concepts (fields/topics) attached by OpenAlex
- Cited by
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0Total citation count in OpenAlex
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76Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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| cited_by_percentile_year | |
| countries_distinct_count | 0 |
| institutions_distinct_count | 41 |
| citation_normalized_percentile.value | 0.28103555 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |