Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET
For high-temperature JET and TFTR discharges, electron cyclotron emission (ECE) measurements of central electron temperature were systematically found to be up to 20% higher than those taken with Thomson scattering. In recent high-performance JET discharges, central Te measurements, performed with L...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2023/03/epjconf_ec212023_03006.pdf |
| _version_ | 1797894052484481024 |
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| author | Fontana M. Giruzzi G. Orsitto F. P. de la Luna E. Dumont R. Figini L. Kos D. Maslov M. Schmuck S. Sozzi C. Challis C. D. Frigione D. Garcia J. Garzotti L. Hobirk J. Kappatou A. Keeling D. Lerche E. Maggi C. Mailloux J. Rimini F. Van Eester D. |
| author_facet | Fontana M. Giruzzi G. Orsitto F. P. de la Luna E. Dumont R. Figini L. Kos D. Maslov M. Schmuck S. Sozzi C. Challis C. D. Frigione D. Garcia J. Garzotti L. Hobirk J. Kappatou A. Keeling D. Lerche E. Maggi C. Mailloux J. Rimini F. Van Eester D. |
| author_sort | Fontana M. |
| collection | DOAJ |
| description | For high-temperature JET and TFTR discharges, electron cyclotron emission (ECE) measurements of central electron temperature were systematically found to be up to 20% higher than those taken with Thomson scattering. In recent high-performance JET discharges, central Te measurements, performed with LIDAR Thomson scattering and the X-mode ECE interferometer, have been studied in a large database, including deuterium (DD), and deuterium-tritium plasmas (DT). Discrepancies between Te measurements have been observed outside of the experimental uncertainties. ECE measurements, at high Te, have been found to be higher or lower than those of LIDAR, depending on the specific plasma scenario. In addition, discrepancies between the peaks of the second and third harmonic ranges of the ECE spectrum have been interpreted as evidence for the presence of non-Maxwellian features in the electron distribution function. These comparisons seem to suggest that such features can be found in most of the high-performance scenarios selected in this JET database. |
| first_indexed | 2024-04-10T07:02:40Z |
| format | Article |
| id | doaj.art-4e308fc914894a39a08adc2461f94b13 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-10T07:02:40Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-4e308fc914894a39a08adc2461f94b132023-02-27T15:17:49ZengEDP SciencesEPJ Web of Conferences2100-014X2023-01-012770300610.1051/epjconf/202327703006epjconf_ec212023_03006Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JETFontana M.0Giruzzi G.1Orsitto F. P.2de la Luna E.3Dumont R.4Figini L.5Kos D.6Maslov M.7Schmuck S.8Sozzi C.9Challis C. D.10Frigione D.11Garcia J.12Garzotti L.13Hobirk J.14Kappatou A.15Keeling D.16Lerche E.17Maggi C.18Mailloux J.19Rimini F.20Van Eester D.21United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreCEA, IRFMENEA Department Fusion and Technology for Nuclear Safety, C R FrascatiNational Fusion Laboratory, CIEMATCEA, IRFMIstituto per la Scienza e Tecnologia dei Plasmi, CNRUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreIstituto per la Scienza e Tecnologia dei Plasmi, CNRIstituto per la Scienza e Tecnologia dei Plasmi, CNRUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreENEA Department Fusion and Technology for Nuclear Safety, C R FrascatiCEA, IRFMUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreMax-Planck-Institut für PlasmaphysikMax-Planck-Institut für PlasmaphysikUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreLaboratory for Plasma Physics, LPP-ERM/KMSUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreUnited Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science CentreFor high-temperature JET and TFTR discharges, electron cyclotron emission (ECE) measurements of central electron temperature were systematically found to be up to 20% higher than those taken with Thomson scattering. In recent high-performance JET discharges, central Te measurements, performed with LIDAR Thomson scattering and the X-mode ECE interferometer, have been studied in a large database, including deuterium (DD), and deuterium-tritium plasmas (DT). Discrepancies between Te measurements have been observed outside of the experimental uncertainties. ECE measurements, at high Te, have been found to be higher or lower than those of LIDAR, depending on the specific plasma scenario. In addition, discrepancies between the peaks of the second and third harmonic ranges of the ECE spectrum have been interpreted as evidence for the presence of non-Maxwellian features in the electron distribution function. These comparisons seem to suggest that such features can be found in most of the high-performance scenarios selected in this JET database.https://www.epj-conferences.org/articles/epjconf/pdf/2023/03/epjconf_ec212023_03006.pdf |
| spellingShingle | Fontana M. Giruzzi G. Orsitto F. P. de la Luna E. Dumont R. Figini L. Kos D. Maslov M. Schmuck S. Sozzi C. Challis C. D. Frigione D. Garcia J. Garzotti L. Hobirk J. Kappatou A. Keeling D. Lerche E. Maggi C. Mailloux J. Rimini F. Van Eester D. Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET EPJ Web of Conferences |
| title | Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET |
| title_full | Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET |
| title_fullStr | Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET |
| title_full_unstemmed | Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET |
| title_short | Investigation of Te measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET |
| title_sort | investigation of te measurements discrepancies between ece and thomson diagnostics in high performance plasmas in jet |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2023/03/epjconf_ec212023_03006.pdf |
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