Improved weighted sum estimation of total radiated power at W7-X
As magnetic confinement devices move toward higher fusion powers, moderating the heat load to the plasma-facing components becomes increasingly challenging. Efficient power dissipation can be achieved through control of the plasma radiation. However, defining a reliable proxy for the total radiated...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/ad9488 |
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| author | G. Partesotti F. Reimold A. Tsikouras D. Zhang G. Kawamura B.J. Peterson the W7-X Team |
| author_facet | G. Partesotti F. Reimold A. Tsikouras D. Zhang G. Kawamura B.J. Peterson the W7-X Team |
| author_sort | G. Partesotti |
| collection | DOAJ |
| description | As magnetic confinement devices move toward higher fusion powers, moderating the heat load to the plasma-facing components becomes increasingly challenging. Efficient power dissipation can be achieved through control of the plasma radiation. However, defining a reliable proxy for the total radiated power is particularly challenging for non-axisymmetric devices such as stellarators. To address this problem, the radiated power can be estimated through a sum of the individual line-integrated bolometer measurements with weights properly calculated to account for the three-dimensional magnetic geometry. The present contribution aims to apply this weighted sum approach to Wendelstein 7-X (W7-X) and quantitatively validate it. First, we generate synthetic radiated power phantoms with characteristic W7-X radiation features to derive a set of optimized line-of-sight weights. Then, we test the weights on mock-ups and EMC3-EIRENE radiation patterns, including acquisition and analysis errors such as random noise fluctuations, camera misalignments, and field errors. Compared to other methods, the optimized weighted sum technique exhibited the best performance in all the presented synthetic test cases. When applied to experimental bolometer data, the optimized weights provided a proxy that is both reliable and real-time capable. Further validation is foreseen for the next experimental campaign. |
| format | Article |
| id | doaj-art-8532892ee88e4c20af9fd9eb41717eea |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-8532892ee88e4c20af9fd9eb41717eea2024-11-29T15:33:48ZengIOP PublishingNuclear Fusion0029-55152024-01-0165101603510.1088/1741-4326/ad9488Improved weighted sum estimation of total radiated power at W7-XG. Partesotti0https://orcid.org/0009-0008-9465-7885F. Reimold1https://orcid.org/0000-0003-4251-7924A. Tsikouras2https://orcid.org/0009-0008-9677-3302D. Zhang3https://orcid.org/0000-0002-5800-4907G. Kawamura4https://orcid.org/0000-0002-9117-5898B.J. Peterson5https://orcid.org/0009-0002-8230-0121the W7-X TeamMax-Planck-Institut für Plasmaphysik , Greifswald, GermanyMax-Planck-Institut für Plasmaphysik , Greifswald, GermanyMax-Planck-Institut für Plasmaphysik , Greifswald, GermanyMax-Planck-Institut für Plasmaphysik , Greifswald, GermanyNational Institute for Fusion Science , Toki, Japan; National Institutes for Quantum Science and Technology , Rokkasho, JapanNational Institute for Fusion Science , Toki, JapanAs magnetic confinement devices move toward higher fusion powers, moderating the heat load to the plasma-facing components becomes increasingly challenging. Efficient power dissipation can be achieved through control of the plasma radiation. However, defining a reliable proxy for the total radiated power is particularly challenging for non-axisymmetric devices such as stellarators. To address this problem, the radiated power can be estimated through a sum of the individual line-integrated bolometer measurements with weights properly calculated to account for the three-dimensional magnetic geometry. The present contribution aims to apply this weighted sum approach to Wendelstein 7-X (W7-X) and quantitatively validate it. First, we generate synthetic radiated power phantoms with characteristic W7-X radiation features to derive a set of optimized line-of-sight weights. Then, we test the weights on mock-ups and EMC3-EIRENE radiation patterns, including acquisition and analysis errors such as random noise fluctuations, camera misalignments, and field errors. Compared to other methods, the optimized weighted sum technique exhibited the best performance in all the presented synthetic test cases. When applied to experimental bolometer data, the optimized weights provided a proxy that is both reliable and real-time capable. Further validation is foreseen for the next experimental campaign.https://doi.org/10.1088/1741-4326/ad9488plasmaradiationbolometerpowerstellarator |
| spellingShingle | G. Partesotti F. Reimold A. Tsikouras D. Zhang G. Kawamura B.J. Peterson the W7-X Team Improved weighted sum estimation of total radiated power at W7-X Nuclear Fusion plasma radiation bolometer power stellarator |
| title | Improved weighted sum estimation of total radiated power at W7-X |
| title_full | Improved weighted sum estimation of total radiated power at W7-X |
| title_fullStr | Improved weighted sum estimation of total radiated power at W7-X |
| title_full_unstemmed | Improved weighted sum estimation of total radiated power at W7-X |
| title_short | Improved weighted sum estimation of total radiated power at W7-X |
| title_sort | improved weighted sum estimation of total radiated power at w7 x |
| topic | plasma radiation bolometer power stellarator |
| url | https://doi.org/10.1088/1741-4326/ad9488 |
| work_keys_str_mv | AT gpartesotti improvedweightedsumestimationoftotalradiatedpoweratw7x AT freimold improvedweightedsumestimationoftotalradiatedpoweratw7x AT atsikouras improvedweightedsumestimationoftotalradiatedpoweratw7x AT dzhang improvedweightedsumestimationoftotalradiatedpoweratw7x AT gkawamura improvedweightedsumestimationoftotalradiatedpoweratw7x AT bjpeterson improvedweightedsumestimationoftotalradiatedpoweratw7x AT thew7xteam improvedweightedsumestimationoftotalradiatedpoweratw7x |