Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BI01: Magnetic Confinement Fusion I
9:30 AM–12:30 PM,
Monday, October 17, 2022
Room: Ballroom 100 A
Chair: Andrea Garofalo, General Atomics
Abstract: BI01.00003 : T-rich scenario for the record fusion energy plasma in JET DT
10:30 AM–11:00 AM
Presenter:
Mikhail Maslov
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Authors:
Mikhail Maslov
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Ernesto Lerche
(Laboratory for Plasma Physics, ERM/KMS, B-1000 Brussels, Belgium)
Clive D Challis
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Joerg Hobirk
(Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany)
Athina Kappatou
(Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany)
Damian B King
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
David Keeling
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Fernanda Rimini
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Elena De La Luna
(Laboratorio Nacional de Fusión, CIEMAT, 28040 Madrid, Spain)
Igor Monakhov
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Philippe Jacquet
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Costanza F Maggi
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Jeronimo Garcia
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Joelle Mailloux
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Yevgen Kazakov
(Laboratory for Plasma Physics, ERM/KMS, B-1000 Brussels, Belgium)
Michele Marin
(EPFL, Swiss Plasma Center (SPC), CH – 1015 Lausanne, Switzerland)
Dirk Van Eester
(Laboratory for Plasma Physics, ERM/KMS, B-1000 Brussels, Belgium)
Gianluca Pucella
(ENEA C. R. Frascati, via E. Fermi 45, 00044 Frascati (Roma), Italy)
Ziga Stancar
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Davide Rigamonti
(Institute for Plasma Science and Technology, CNR, via Cozzi 53, 20125 Milan, Italy)
Jacob Eriksson
(Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden)
Massimo Nocente
(Institute for Plasma Science and Technology, CNR, via Cozzi 53, 20125 Milan, Italy)
Guy Matthews
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Krassimir Kirov
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Vasili Kiptily
(UKAEA, Culham Science Centre, Abingdon, OX143DB, United Kingdom)
Agata Chomiczewska
(Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland)
Irena Ivanova-Stanik
(Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland)
Fulvio Auriemma
(Consorzio RFX CNR-ISTP, Corso Stati Uniti 4, 35127 Padova, Italy)
Rita Lorenzini
(Consorzio RFX CNR-ISTP, Corso Stati Uniti 4, 35127 Padova, Italy)
A different route to achieve this goal used D-NBI heating into a tritium plasma to maximize the number of beam-target D-T reactions. This was predicted to produce higher net fusion power in comparison to 50/50 DT plasmas of similar performance. Providing low deuterium concentration in such a plasma, it could also be combined with fundamental D-minority ICRH for additional boost to the fusion power. At JET, this scheme is accessible at the lowest ICRH frequency 29MHz and high BT=3.86T which is an engineering limit for 5s flattop plasma.
A mock up experiment with D-NBI heating of hydrogen plasma was performed prior to the DT campaign to test the isotope control aspect. 15/85 DH composition was readily achieved without excessive core accumulation of deuterium despite intensive core fuelling by NBI particles. That confirmed the fast isotope mixing effect previously observed at JET albeit at lower plasma current and heating power.
Subsequently, a stable hybrid scenario pure tritium plasma with T-NBI was demonstrated and served as a reference discharge for the DT. After a few minor modifications this plasma was finally performed with D-NBI and 29MHz ICRH to produce a series of record fusion energy pulses, with the highest Efus=59MJ and 5s-averaged Q=0.33. As expected, the plasma remained Tritium-rich with approximately 15/85 DT composition. Somewhat surprisingly, this plasma had rather small and fast (80-100Hz) ELMs, despite the high tritium content and high additional heating power injected.
In this contribution, the main experimental results related to the record fusion energy pulse will be shown, together with the first analysis and modelling.
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