Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET
Recently-developed methods are used successfully to reconstruct the two-dimensional velocity-space distribution of the energetic minority MeV ion tail created by heating in the ion cyclotron range of frequencies (ICRFs) in the D–D $ _{\mathrm{NBI}}$ – ^3 He three-ion scheme. This reconstruction is b...
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2025-01-01
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| Online Access: | https://doi.org/10.1088/1741-4326/addb60 |
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| author | B.C.G. Reman H. Järleblad Y. Dong J. Eriksson M. Nocente Y. Kazakov E. Lerche D. Van Eester R.O. Dendy D. Moseev A. Snicker M. Rud B.S. Schmidt Ž. Štancar A. Valentini M. Salewski JET Contributors |
| author_facet | B.C.G. Reman H. Järleblad Y. Dong J. Eriksson M. Nocente Y. Kazakov E. Lerche D. Van Eester R.O. Dendy D. Moseev A. Snicker M. Rud B.S. Schmidt Ž. Štancar A. Valentini M. Salewski JET Contributors |
| author_sort | B.C.G. Reman |
| collection | DOAJ |
| description | Recently-developed methods are used successfully to reconstruct the two-dimensional velocity-space distribution of the energetic minority MeV ion tail created by heating in the ion cyclotron range of frequencies (ICRFs) in the D–D $ _{\mathrm{NBI}}$ – ^3 He three-ion scheme. This reconstruction is based on neutron emission spectroscopy and gamma-ray spectroscopy measurements of JET plasma 95679. These datasets present challenges in velocity-space tomography which are met by collisional regularisation coupled to a sparsity-promoting regularisation technique. In combination, these capture the energetic ion tail in pitch-angle as well as in energy. Our reconstructions highlight the importance of diagnostics that can probe the plasma with oblique lines-of-sight with respect to the direction of the confining magnetic field. Our inferred fast-ion distribution corroborates experimentally the pitch angle tilt of the energetic ion tail predicted analytically, and by TRANSP simulations, for the three ion ICRF scheme. The synergies between neutral-beam injection and ICRF heating are captured by these diagnostics, and we are able to validate models of electromagnetic ICRF wave heating directly from the experiments. |
| format | Article |
| id | doaj-art-a2878e75cffa4bdd98c41230ae2df65a |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-a2878e75cffa4bdd98c41230ae2df65a2025-08-20T03:33:36ZengIOP PublishingNuclear Fusion0029-55152025-01-0165707600710.1088/1741-4326/addb60Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JETB.C.G. Reman0https://orcid.org/0000-0003-3507-9444H. Järleblad1https://orcid.org/0000-0003-1126-686XY. Dong2https://orcid.org/0000-0001-8363-9448J. Eriksson3https://orcid.org/0000-0002-0892-3358M. Nocente4https://orcid.org/0000-0003-0170-5275Y. Kazakov5https://orcid.org/0000-0001-6316-5441E. Lerche6https://orcid.org/0000-0003-4584-3581D. Van Eester7https://orcid.org/0000-0002-4284-3992R.O. Dendy8https://orcid.org/0009-0002-0017-9103D. Moseev9A. Snicker10M. Rud11https://orcid.org/0000-0003-2482-4461B.S. Schmidt12https://orcid.org/0000-0001-5302-9489Ž. Štancar13https://orcid.org/0000-0002-9608-280XA. Valentini14https://orcid.org/0009-0003-5394-4267M. Salewski15https://orcid.org/0000-0002-3699-679XJET Contributors16Department of Physics, Technical University of Denmark , DK-2800 Kgs. Lyngby, Denmark; Laboratory for Plasma Physics LPP-ERM/KMS , B-1000 Brussels, Belgium; Centre for Fusion, Space and Astrophysics, Department of Physics, Warwick University , Coventry CV4 7AL, United Kingdom of Great Britain and Northern IrelandDepartment of Applied Mathematics and Computer Science, Technical University of Denmark , DK-2800 Kgs. Lyngby, DenmarkDepartment of Applied Mathematics and Computer Science, Technical University of Denmark , DK-2800 Kgs. Lyngby, DenmarkDepartment of Physics and Astronomy, Uppsala University , 751 20 Uppsala, SwedenDepartment of Physics, University of Milano-Bicocca , Piazza della Scienza 3, 20126 Milano, ItalyLaboratory for Plasma Physics LPP-ERM/KMS , B-1000 Brussels, BelgiumLaboratory for Plasma Physics LPP-ERM/KMS , B-1000 Brussels, BelgiumLaboratory for Plasma Physics LPP-ERM/KMS , B-1000 Brussels, BelgiumCentre for Fusion, Space and Astrophysics, Department of Physics, Warwick University , Coventry CV4 7AL, United Kingdom of Great Britain and Northern IrelandMax-Planck-Institut fur Plasmaphysik , Wendelsteinstr. 1, Greifswald 17491, GermanyDepartment of Applied Physics, Aalto University , PO Box 14199 FI, Espoo 00076, FinlandDepartment of Physics, Technical University of Denmark , DK-2800 Kgs. Lyngby, DenmarkDepartment of Physics and Astronomy, University of California , Irvine, CA 92697, United States of AmericaUKAEA, Culham Centre for Fusion Energy , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandDepartment of Physics, Technical University of Denmark , DK-2800 Kgs. Lyngby, Denmark; Department of Physics, University of Milano-Bicocca , Piazza della Scienza 3, 20126 Milano, ItalyDepartment of Physics, Technical University of Denmark , DK-2800 Kgs. Lyngby, DenmarkUKAEA, Culham Centre for Fusion Energy , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandRecently-developed methods are used successfully to reconstruct the two-dimensional velocity-space distribution of the energetic minority MeV ion tail created by heating in the ion cyclotron range of frequencies (ICRFs) in the D–D $ _{\mathrm{NBI}}$ – ^3 He three-ion scheme. This reconstruction is based on neutron emission spectroscopy and gamma-ray spectroscopy measurements of JET plasma 95679. These datasets present challenges in velocity-space tomography which are met by collisional regularisation coupled to a sparsity-promoting regularisation technique. In combination, these capture the energetic ion tail in pitch-angle as well as in energy. Our reconstructions highlight the importance of diagnostics that can probe the plasma with oblique lines-of-sight with respect to the direction of the confining magnetic field. Our inferred fast-ion distribution corroborates experimentally the pitch angle tilt of the energetic ion tail predicted analytically, and by TRANSP simulations, for the three ion ICRF scheme. The synergies between neutral-beam injection and ICRF heating are captured by these diagnostics, and we are able to validate models of electromagnetic ICRF wave heating directly from the experiments.https://doi.org/10.1088/1741-4326/addb60velocity-space tomographyICRFcollisional regularisationsparsity promoting regularisationthree-ion schemefusion plasma |
| spellingShingle | B.C.G. Reman H. Järleblad Y. Dong J. Eriksson M. Nocente Y. Kazakov E. Lerche D. Van Eester R.O. Dendy D. Moseev A. Snicker M. Rud B.S. Schmidt Ž. Štancar A. Valentini M. Salewski JET Contributors Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET Nuclear Fusion velocity-space tomography ICRF collisional regularisation sparsity promoting regularisation three-ion scheme fusion plasma |
| title | Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET |
| title_full | Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET |
| title_fullStr | Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET |
| title_full_unstemmed | Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET |
| title_short | Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET |
| title_sort | velocity space tomography of an mev fast ion tail generated by three ion scheme icrf heating at jet |
| topic | velocity-space tomography ICRF collisional regularisation sparsity promoting regularisation three-ion scheme fusion plasma |
| url | https://doi.org/10.1088/1741-4326/addb60 |
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