Infrared thermography in metallic environments of WEST and ASDEX Upgrade
Infra-red (IR) thermography is a widely used tool in fusion devices to monitor and to protect the plasma-facing component (PFC) from excessive heat loads. However, with the use of all-metal walls in fusion devices, deriving surface temperature from IR measurements has become more challenging. In thi...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179120301447 |
| _version_ | 1818427385239830528 |
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| author | M-H. Aumeunier J. Gerardin C. Talatizi M. Le Bohec M. Ben Yaala L. Marot T. Loarer R. Mitteau J. Gaspar F. Rigollet X. Courtois M. Houry A. Herrmann M. Faitsch |
| author_facet | M-H. Aumeunier J. Gerardin C. Talatizi M. Le Bohec M. Ben Yaala L. Marot T. Loarer R. Mitteau J. Gaspar F. Rigollet X. Courtois M. Houry A. Herrmann M. Faitsch |
| author_sort | M-H. Aumeunier |
| collection | DOAJ |
| description | Infra-red (IR) thermography is a widely used tool in fusion devices to monitor and to protect the plasma-facing component (PFC) from excessive heat loads. However, with the use of all-metal walls in fusion devices, deriving surface temperature from IR measurements has become more challenging. In this paper, an overview of infra-red measurements in the metallic tokamaks WEST and ASDEX Upgrade (AUG) is reported and the techniques carried out in the modeling and experimental fields to deal with this radiative and fully reflective environment are presented. Experimental characterizations of metallic samples in laboratory and experiments in WEST and AUG reveal that the behavior of both the emission and the reflectance can vary significantly with surface roughness, machining process and as the plasma operation progress. In parallel, the development of a synthetic IR diagnostic has allowed for a better interpretation of the IR images by assessing the reflection patterns and their origin. This has also proven that small-scale change in the emission pattern of beveled PFC can be confused with abnormal thermal events. Numerical solutions to evaluate the contribution of the reflections associated with a variable emissivity in a fully reflective and radiative environment are finally presented. |
| first_indexed | 2024-12-14T14:44:53Z |
| format | Article |
| id | doaj.art-6d043e02bd81448ab3cb9ed0edeef0e4 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-14T14:44:53Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-6d043e02bd81448ab3cb9ed0edeef0e42022-12-21T22:57:19ZengElsevierNuclear Materials and Energy2352-17912021-03-0126100879Infrared thermography in metallic environments of WEST and ASDEX UpgradeM-H. Aumeunier0J. Gerardin1C. Talatizi2M. Le Bohec3M. Ben Yaala4L. Marot5T. Loarer6R. Mitteau7J. Gaspar8F. Rigollet9X. Courtois10M. Houry11A. Herrmann12M. Faitsch13CEA Cadarache, 13108 Saint Paul-Lez-Durance, France; Corresponding author.CEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceCEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceAix Marseille Univ, CNRS, IUSTI, Marseille, FranceDepartment of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, SwitzerlandDepartment of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, SwitzerlandCEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceCEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceAix Marseille Univ, CNRS, IUSTI, Marseille, FranceAix Marseille Univ, CNRS, IUSTI, Marseille, FranceCEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceCEA Cadarache, 13108 Saint Paul-Lez-Durance, FranceMax-Planck-Institut für Plasmaphysiks, D-85748 Garching, GermanyMax-Planck-Institut für Plasmaphysiks, D-85748 Garching, GermanyInfra-red (IR) thermography is a widely used tool in fusion devices to monitor and to protect the plasma-facing component (PFC) from excessive heat loads. However, with the use of all-metal walls in fusion devices, deriving surface temperature from IR measurements has become more challenging. In this paper, an overview of infra-red measurements in the metallic tokamaks WEST and ASDEX Upgrade (AUG) is reported and the techniques carried out in the modeling and experimental fields to deal with this radiative and fully reflective environment are presented. Experimental characterizations of metallic samples in laboratory and experiments in WEST and AUG reveal that the behavior of both the emission and the reflectance can vary significantly with surface roughness, machining process and as the plasma operation progress. In parallel, the development of a synthetic IR diagnostic has allowed for a better interpretation of the IR images by assessing the reflection patterns and their origin. This has also proven that small-scale change in the emission pattern of beveled PFC can be confused with abnormal thermal events. Numerical solutions to evaluate the contribution of the reflections associated with a variable emissivity in a fully reflective and radiative environment are finally presented.http://www.sciencedirect.com/science/article/pii/S2352179120301447 |
| spellingShingle | M-H. Aumeunier J. Gerardin C. Talatizi M. Le Bohec M. Ben Yaala L. Marot T. Loarer R. Mitteau J. Gaspar F. Rigollet X. Courtois M. Houry A. Herrmann M. Faitsch Infrared thermography in metallic environments of WEST and ASDEX Upgrade Nuclear Materials and Energy |
| title | Infrared thermography in metallic environments of WEST and ASDEX Upgrade |
| title_full | Infrared thermography in metallic environments of WEST and ASDEX Upgrade |
| title_fullStr | Infrared thermography in metallic environments of WEST and ASDEX Upgrade |
| title_full_unstemmed | Infrared thermography in metallic environments of WEST and ASDEX Upgrade |
| title_short | Infrared thermography in metallic environments of WEST and ASDEX Upgrade |
| title_sort | infrared thermography in metallic environments of west and asdex upgrade |
| url | http://www.sciencedirect.com/science/article/pii/S2352179120301447 |
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