Admixed pellets for fast and efficient delivery of plasma enhancement gases: Investigations at AUG exploring the option for EU-DEMO Article Swipe
P. T. Lang
,
L. R. Baylor
,
C. Day
,
R. Dux
,
R. M. McDermott
,
T. Giegerich
,
T. Gleiter
,
A. Kallenbach
,
B. Ploeckl
,
V. Rohde
,
A. Zito
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1016/j.fusengdes.2023.114020
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1016/j.fusengdes.2023.114020
Gas and pellet injection are envisaged for particle fuelling in EU-DEMO. The gas system will provide edge and divertor fuelling and any further gas species required for operation. Pellets, mm-sized bodies formed from solid hydrogen fuel, are designed for efficient and fast core fuelling. However, they can also be employed for a more efficient delivery of plasma enhancement gases, by admixing them with the fuelling pellets. To check this option for EU-DEMO, explorative investigations have been performed at ASDEX Upgrade (AUG). The AUG system produces ice in a batch process sufficient for about 100 pellets, initially designed for operation with pure H2 or D2. On a trial basis, pellet formation was tested using an H2/D2 mixture and admixtures containing small amounts (up to 2 mol%) of N2, Ar, Kr or Xe in the D2 host. A homogeneous and reproducible ice composition was found for the H2/D2 = 1:1 case. For all the admixed gases, a depletion of the admixture in the ice with increasing atomic number is observed. Nevertheless, the fast and efficient delivery of admixed pellets was clearly demonstrated in dedicated plasma experiments at AUG. Detailed investigations showed that the Ar supplied via admixed pellets has a higher radiation efficiency and a faster radiation rise than an Ar/D2 gas puff. Furthermore, Ar density measurements in a discharge with admixed pellet injection show reasonable agreement with findings of a fading admixed species' concentration along the ice rod and assumptions on the pellet ablation location in the plasma. Investigations performed at the Oak Ridge National Laboratory with a large batch extruder using up to 2 mol% Ne in D2 confirmed that production of much larger ice quantities can be achieved. These initial explorative investigations clearly reveal the great potential of admixed pellets, although they also demonstrate that further technology efforts are required before their benefits can be utilized.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1016/j.fusengdes.2023.114020
- OA Status
- hybrid
- Cited By
- 3
- References
- 17
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4387206284
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4387206284Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1016/j.fusengdes.2023.114020Digital Object Identifier
- Title
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Admixed pellets for fast and efficient delivery of plasma enhancement gases: Investigations at AUG exploring the option for EU-DEMOWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-09-29Full publication date if available
- Authors
-
P. T. Lang, L. R. Baylor, C. Day, R. Dux, R. M. McDermott, T. Giegerich, T. Gleiter, A. Kallenbach, B. Ploeckl, V. Rohde, A. ZitoList of authors in order
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https://doi.org/10.1016/j.fusengdes.2023.114020Publisher landing page
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YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
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https://doi.org/10.1016/j.fusengdes.2023.114020Direct OA link when available
- Concepts
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Pellets, Pellet, Materials science, Divertor, ASDEX Upgrade, Plasma, Hydrogen, Nuclear engineering, Tokamak, Composite material, Chemistry, Physics, Nuclear physics, Organic chemistry, EngineeringTop concepts (fields/topics) attached by OpenAlex
- Cited by
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3Total citation count in OpenAlex
- Citations by year (recent)
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2025: 2, 2024: 1Per-year citation counts (last 5 years)
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17Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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