Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas
Recent JET D–T campaigns opened the possibility of unique isotope studies to investigate the L–H transition physics in view of reactor plasmas and to study the origin of the observed power threshold minimum. In the present paper, we characterise L–H transitions in the low and high-density branches o...
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| 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/ad96cd |
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| author | P. Vincenzi E.R. Solano E. Delabie C. Angioni G. Birkenmeier C. Maggi R.B. Morales H.J. Sun E. Tholerus JET Contributors |
| author_facet | P. Vincenzi E.R. Solano E. Delabie C. Angioni G. Birkenmeier C. Maggi R.B. Morales H.J. Sun E. Tholerus JET Contributors |
| author_sort | P. Vincenzi |
| collection | DOAJ |
| description | Recent JET D–T campaigns opened the possibility of unique isotope studies to investigate the L–H transition physics in view of reactor plasmas and to study the origin of the observed power threshold minimum. In the present paper, we characterise L–H transitions in the low and high-density branches of JET NBI-heated D–T plasmas. As discussed in the paper, L–H transition has been hypothesised to be determined by the transport power losses of plasma ions, i.e. the so-called ion heat flux ( Q _i ). We present the first power balance analysis of JET NBI-heated D–T plasmas to evaluate the ion heat flux at the transition. Due to the experimental setting being similar to previous JET D experiments, we also directly compare the results, discussing the isotope effect and similarities between datasets. First, we find an isotope effect between D and D–T Q _i , with a lower Q _i in D–T plasmas. We confirm that the ion heat flux deviates from density linearity compared to the linear trend observed in wave-heated D plasmas of other tokamaks. The deviation we observe in NBI-heated L–H transitions happens at an isotope-dependent density. Plasma edge rotation correlates with Q _i deviation from density linearity in the low-density branch. However, further investigations would be required to assess the role of rotation on Q _i and the power threshold minimum at JET. At low plasma density, NBI power dominates Q _i , while increasing the density makes the equipartition power dominant. We finally compare our results with hypotheses proposed from evidence in other tokamaks to present a complete overview of ion heat flux analyses in D and D–T NBI-heated plasmas at JET. |
| format | Article |
| id | doaj-art-e31345a60bd84795bf42676b77611202 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-e31345a60bd84795bf42676b776112022024-12-05T12:23:59ZengIOP PublishingNuclear Fusion0029-55152024-01-0165101603810.1088/1741-4326/ad96cdNon-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmasP. Vincenzi0https://orcid.org/0000-0002-5156-4354E.R. Solano1https://orcid.org/0000-0002-4815-3407E. Delabie2https://orcid.org/0000-0001-9834-874XC. Angioni3https://orcid.org/0000-0003-0270-9630G. Birkenmeier4https://orcid.org/0000-0001-7508-3646C. Maggi5https://orcid.org/0000-0001-7208-2613R.B. Morales6https://orcid.org/0000-0003-0667-3356H.J. Sun7https://orcid.org/0000-0003-0880-0013E. Tholerus8https://orcid.org/0000-0002-3262-1958JET ContributorsConsorzio RFX (CNR, ENEA, INFN, Universit`a di Padova , Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova, Italy; Institute for Plasma Science and Technology, CNR , Padova, ItalyLaboratorio Nacional de Fusión, CIEMAT , Madrid, SpainOak Ridge National Laboratory , Oak Ridge, TN 37831, United States of AmericaMax-Planck-Institut für Plasmaphysik , D-85748 Garching, GermanyMax-Planck-Institut für Plasmaphysik , D-85748 Garching, Germany; TUM School of Natural Sciences, Physics Department, Technical University of Munich , 85748 Garching, GermanyUKAEA (United Kingdom Atomic Energy Authority), Culham Campus , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandUKAEA (United Kingdom Atomic Energy Authority), Culham Campus , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandUKAEA (United Kingdom Atomic Energy Authority), Culham Campus , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandUKAEA (United Kingdom Atomic Energy Authority), Culham Campus , Abingdon, Oxfordshire OX14 3DB, United Kingdom of Great Britain and Northern IrelandRecent JET D–T campaigns opened the possibility of unique isotope studies to investigate the L–H transition physics in view of reactor plasmas and to study the origin of the observed power threshold minimum. In the present paper, we characterise L–H transitions in the low and high-density branches of JET NBI-heated D–T plasmas. As discussed in the paper, L–H transition has been hypothesised to be determined by the transport power losses of plasma ions, i.e. the so-called ion heat flux ( Q _i ). We present the first power balance analysis of JET NBI-heated D–T plasmas to evaluate the ion heat flux at the transition. Due to the experimental setting being similar to previous JET D experiments, we also directly compare the results, discussing the isotope effect and similarities between datasets. First, we find an isotope effect between D and D–T Q _i , with a lower Q _i in D–T plasmas. We confirm that the ion heat flux deviates from density linearity compared to the linear trend observed in wave-heated D plasmas of other tokamaks. The deviation we observe in NBI-heated L–H transitions happens at an isotope-dependent density. Plasma edge rotation correlates with Q _i deviation from density linearity in the low-density branch. However, further investigations would be required to assess the role of rotation on Q _i and the power threshold minimum at JET. At low plasma density, NBI power dominates Q _i , while increasing the density makes the equipartition power dominant. We finally compare our results with hypotheses proposed from evidence in other tokamaks to present a complete overview of ion heat flux analyses in D and D–T NBI-heated plasmas at JET.https://doi.org/10.1088/1741-4326/ad96cdL–H transitionH-modeion heat fluxJETdeuterium–tritiumisotope effect |
| spellingShingle | P. Vincenzi E.R. Solano E. Delabie C. Angioni G. Birkenmeier C. Maggi R.B. Morales H.J. Sun E. Tholerus JET Contributors Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas Nuclear Fusion L–H transition H-mode ion heat flux JET deuterium–tritium isotope effect |
| title | Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas |
| title_full | Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas |
| title_fullStr | Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas |
| title_full_unstemmed | Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas |
| title_short | Non-linear dependence of ion heat flux on plasma density at the L–H transition of JET NBI-heated deuterium–tritium plasmas |
| title_sort | non linear dependence of ion heat flux on plasma density at the l h transition of jet nbi heated deuterium tritium plasmas |
| topic | L–H transition H-mode ion heat flux JET deuterium–tritium isotope effect |
| url | https://doi.org/10.1088/1741-4326/ad96cd |
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