Beam-ion losses velocity-space distribution under neutral-beam injection on EAST
The velocity-space distribution of the fast-ion loss in EAST neutral-beam injection (NBI) heating discharge is obtained both from Scintillator-based fast-ion loss detector (FILD) signals and by ASCOT5 and FILDSIM simulations. The results of simulations are in good agreement with the distribution of...
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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/ad933f |
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| author | S.S. Wang Z.X. Zhang J. Huang J.F. Chang J. Galdon-Quiroga L. Sanchis W. Gao J. Fu Y.X. Sun X.H. Wang C. Shi the EAST Team |
| author_facet | S.S. Wang Z.X. Zhang J. Huang J.F. Chang J. Galdon-Quiroga L. Sanchis W. Gao J. Fu Y.X. Sun X.H. Wang C. Shi the EAST Team |
| author_sort | S.S. Wang |
| collection | DOAJ |
| description | The velocity-space distribution of the fast-ion loss in EAST neutral-beam injection (NBI) heating discharge is obtained both from Scintillator-based fast-ion loss detector (FILD) signals and by ASCOT5 and FILDSIM simulations. The results of simulations are in good agreement with the distribution of beam-ion losses measured with FILD of EAST and the correctness of the fast-ion loss distribution has been demonstrated. Simulations indicate that the beam-ion losses observed by the FILD probe are attributed to the fast ions from both the high-field side (HFS) and the low-field side (LFS). However, the beam-ion losses from the HFS (associated with NBI1L) have not been observed experimentally due to the limited detecting range of the FILD probe. Therefore, an upgrade and modification of the FILD probe was carried out in 2022 to enable the detection of fast-ion loss with smaller pitch angles. Comparative analysis is conducted in neutral-beam injection (NBI2R) discharges after the upgrade, which indicates that the velocity-space distribution of beam-ion losses from the HFS has strong agreement between experimental measurements and simulation results. However, the experimental and simulated results of the velocity-space distribution of beam-ion losses from the LFS shows inconsistencies, primarily because the BBNBI module in the simulation does not consider the contributions of boundary neutral particles to neutral-beam deposition (ionization reactions). These conclusions not only provide valuable references for improving the neutral-beam deposition model but also establish a fundamental basis for further exploring the mechanisms of fast-ion loss under various conditions on the EAST tokamak. |
| format | Article |
| id | doaj-art-8252b89b6d5d4cd69a592b9fa49b20ee |
| institution | OA Journals |
| issn | 0029-5515 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-8252b89b6d5d4cd69a592b9fa49b20ee2025-08-20T02:28:19ZengIOP PublishingNuclear Fusion0029-55152024-01-0165101602610.1088/1741-4326/ad933fBeam-ion losses velocity-space distribution under neutral-beam injection on EASTS.S. Wang0Z.X. Zhang1https://orcid.org/0009-0004-0193-0549J. Huang2J.F. Chang3J. Galdon-Quiroga4https://orcid.org/0000-0002-7415-1894L. Sanchis5https://orcid.org/0000-0001-8211-3356W. Gao6J. Fu7https://orcid.org/0000-0003-0051-1428Y.X. Sun8X.H. Wang9https://orcid.org/0000-0001-8191-9606C. Shi10the EAST Team11Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; Qingdao Sifang SRI Intellectual Technology Co., Ltd , Qingdao 266031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaDepartment of Atomic, Molecular and Nuclear Physics, University of Seville , Seville 41012, SpainDepartment of Atomic, Molecular and Nuclear Physics, University of Seville , Seville 41012, SpainHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaThe velocity-space distribution of the fast-ion loss in EAST neutral-beam injection (NBI) heating discharge is obtained both from Scintillator-based fast-ion loss detector (FILD) signals and by ASCOT5 and FILDSIM simulations. The results of simulations are in good agreement with the distribution of beam-ion losses measured with FILD of EAST and the correctness of the fast-ion loss distribution has been demonstrated. Simulations indicate that the beam-ion losses observed by the FILD probe are attributed to the fast ions from both the high-field side (HFS) and the low-field side (LFS). However, the beam-ion losses from the HFS (associated with NBI1L) have not been observed experimentally due to the limited detecting range of the FILD probe. Therefore, an upgrade and modification of the FILD probe was carried out in 2022 to enable the detection of fast-ion loss with smaller pitch angles. Comparative analysis is conducted in neutral-beam injection (NBI2R) discharges after the upgrade, which indicates that the velocity-space distribution of beam-ion losses from the HFS has strong agreement between experimental measurements and simulation results. However, the experimental and simulated results of the velocity-space distribution of beam-ion losses from the LFS shows inconsistencies, primarily because the BBNBI module in the simulation does not consider the contributions of boundary neutral particles to neutral-beam deposition (ionization reactions). These conclusions not only provide valuable references for improving the neutral-beam deposition model but also establish a fundamental basis for further exploring the mechanisms of fast-ion loss under various conditions on the EAST tokamak.https://doi.org/10.1088/1741-4326/ad933fbeam-ion lossesvelocity-space distributionASCOTFILDSIM |
| spellingShingle | S.S. Wang Z.X. Zhang J. Huang J.F. Chang J. Galdon-Quiroga L. Sanchis W. Gao J. Fu Y.X. Sun X.H. Wang C. Shi the EAST Team Beam-ion losses velocity-space distribution under neutral-beam injection on EAST Nuclear Fusion beam-ion losses velocity-space distribution ASCOT FILDSIM |
| title | Beam-ion losses velocity-space distribution under neutral-beam injection on EAST |
| title_full | Beam-ion losses velocity-space distribution under neutral-beam injection on EAST |
| title_fullStr | Beam-ion losses velocity-space distribution under neutral-beam injection on EAST |
| title_full_unstemmed | Beam-ion losses velocity-space distribution under neutral-beam injection on EAST |
| title_short | Beam-ion losses velocity-space distribution under neutral-beam injection on EAST |
| title_sort | beam ion losses velocity space distribution under neutral beam injection on east |
| topic | beam-ion losses velocity-space distribution ASCOT FILDSIM |
| url | https://doi.org/10.1088/1741-4326/ad933f |
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