Numerical simulation of neutral gas dynamics in the W7-X sub-divertor Article Swipe
S. Varoutis
,
C. Tantos
,
H. Strobel
,
C. Day
,
C. P. Dhard
,
Victoria Haak
,
Yu. Igitkhanov
,
D. Naujoks
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1088/1741-4326/ad49b5
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1088/1741-4326/ad49b5
The present work presents a 2D and 3D modeling of the neutral gas flow in the sub-divertor region of the W7-X. The investigations have been done using the DIVGAS code. The complex 2D and 3D geometries of the divertor components in the sub-divertor region have been considered and the Standard and High-Iota magnetic configurations have been numerically simulated. The main objective of this study is to investigate the dynamics of neutral particles in the sub-divertor region including the effects due to geometry and toroidal and poloidal leakages located at the divertor targets and baffles on the achieved pumping efficiency. A sensitivity analysis has been performed for the effect of various geometrical and flow parameters on the pumping performance, under different plasma scenarios. The considered incoming fluxes in the sub-divertor range between 10 20 to 10 22 (H 2 s −1 ). The main conclusions, which can be extracted from the present numerical analysis could be summarized as follows; a large fraction of incoming neutral particle flux i.e. >70% on the low iota side and >40% for the high iota side is leaked back to the main divertor region, while higher incoming neutral fluxes facilitate the increase of the pumped flux as well as the decrease of the outflux. It has been estimated that a small fraction ∼3%–4% of the incoming neutral flux is being pumped via the turbo-molecular pumps. The closure of the toroidal leakages as well as the inclination of the pumping gap panel by 9 o facilitate the increase of the pumped flux, but considering the all the engineering constraints, the latter option seems to be more easy to be implemented. For low incoming neutral fluxes (∼10 20 H 2 s −1 ) and for the case of AEH section, free molecular flow conditions are estimated and therefore neutral-neutral collisions could be neglected. For higher incoming neutral fluxes and for both AEH and AEP sections neutral-neutral collisions play a significant role in the flow establishment. A comparison with available experimental measurements of the neutral pressure in the sub-divertor has been performed for Standard and High-Iota plasma discharges. The 3D DIVGAS simulations predict qualitatively the experimental data with relative deviation between 25 and 63%. All the above numerical findings will actively support the optimization of the W7-X particle exhaust, in view of the experimental campaign OP2.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1088/1741-4326/ad49b5
- https://iopscience.iop.org/article/10.1088/1741-4326/ad49b5/pdf
- OA Status
- diamond
- Cited By
- 5
- References
- 23
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4396828981
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4396828981Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1088/1741-4326/ad49b5Digital Object Identifier
- Title
-
Numerical simulation of neutral gas dynamics in the W7-X sub-divertorWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
2024Year of publication
- Publication date
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2024-05-11Full publication date if available
- Authors
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S. Varoutis, C. Tantos, H. Strobel, C. Day, C. P. Dhard, Victoria Haak, Yu. Igitkhanov, D. NaujoksList of authors in order
- Landing page
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https://doi.org/10.1088/1741-4326/ad49b5Publisher landing page
- PDF URL
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https://iopscience.iop.org/article/10.1088/1741-4326/ad49b5/pdfDirect link to full text PDF
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YesWhether a free full text is available
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diamondOpen access status per OpenAlex
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https://iopscience.iop.org/article/10.1088/1741-4326/ad49b5/pdfDirect OA link when available
- Concepts
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Divertor, Toroid, Baffle, Plasma, Mechanics, Flux (metallurgy), Neutral particle, Physics, Computational fluid dynamics, Atomic physics, Range (aeronautics), Materials science, Computational physics, Tokamak, Nuclear physics, Thermodynamics, Metallurgy, Composite materialTop concepts (fields/topics) attached by OpenAlex
- Cited by
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5Total citation count in OpenAlex
- Citations by year (recent)
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2025: 4, 2024: 1Per-year citation counts (last 5 years)
- References (count)
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23Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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