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: BI01.00002 : Sustained high fusion power production with the hybrid scenario in the recent JET D-T campaign
10:00 AM–10:30 AM
Presenter:
Athina Kappatou
(Max-Planck-Institut für Plasmaphysik, Garching, Germany)
Authors:
Athina Kappatou
(Max-Planck-Institut für Plasmaphysik, Garching, Germany)
Clive D Challis
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Joerg Hobirk
(Max-Planck-Institut für Plasmaphysik, Garching, Germany)
Ernesto Lerche
(LPP-ERM/KMS, Brussels, Belgium)
Damian B King
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
David Keeling
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Clemente Angioni
(Max-Planck-Institut für Plasmaphysik, Garching, Germany)
Fulvio Auriemma
(Consorzio RFX, ISTP-CNR corso Stati Uniti, Padova, Italy)
Eva Belonohy
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Francis J Casson
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Agata Chomiczewska
(IPPLM, Warsaw, Poland)
Ivor Coffey
(Queen's University, Belfast, United Kingdom)
Jacob Eriksson
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Daniel Fajardo
(Max-Planck-Institut für Plasmaphysik, Garching, Germany)
Anthony R Field
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Matteo Fontana
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Josep Maria Fontdecaba
(Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain)
Jeronimo Garcia
(CEA, IRFM, Saint-Paul-lez-Durance, France)
Nick C Hawkes
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Aaron Ho
(Eindhoven University of Technology, the Netherlands)
Fabien Jaulmes
(Institute of Plasma Physics of the CAS, Praha, Czech Republic)
Vasili Kiptily
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Krassimir Kirov
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Morten Lennholm
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Costanza F Maggi
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Joelle Mailloux
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Mikhail Maslov
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Sheena Menmuir
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Gianluca Pucella
(ENEA, Fusion and Nuclear Safety Department, C.R. Frascati, Italy)
Elisabeth Rachlew
(Royal Institute of Technology, Stockholm, Sweden)
Fernanda Rimini
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Samuli Saarelma
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Arne Sahlberg
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Scott Silburn
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Adrianus C Sips
(General Atomics, San Diego, USA)
Emilia R Solano
(Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain)
Christ Stuart
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Hongjuan Sun
(UKAEA, CCFE, Culham Science Centre, Abingdon, United Kingdom)
Marco Valisa
(Consorzio RFX, ISTP-CNR corso Stati Uniti, Padova, Italy)
Collaboration:
JET Contributors (See the author list of 'Overview of JET results for optimising ITER operation' by J. Mailloux et al 2022 Nucl. Fusion 62 042026)
To prepare for the D-T experiments, the ‘hybrid’ scenario at JET was further developed in D in recent years, culminating in the successful optimization of the scenario for high performance. Notably, a reduction in the W content due to temperature gradient screening was achieved, as high Ti and vφ at the pedestal top led to enhanced outward neoclassical convection in the low collisionality regime of these plasmas. Deleterious MHD activity was avoided. The follow-up experiments in T provided experience in navigating the isotope effects and their impact on plasma performance. As example, both in T and D-T, the current ramp-up phase density had to be tailored to counteract the increased core impurity radiation and to recover the desired q-profile. The access to H-mode had to be re-optimised, by fine-tuning the heating and fuelling trajectories.
Throughout, extensive modelling of these isotope and impurity transport effects, both interpretative and predictive, accompanied the experiments and contributed to the successful results. In turn, the high performance and confinement D-T pulses provide valuable data for model validation and extrapolation to future devices.
In this contribution, the scenario challenges and the strategies used to deal with the implications of increasing fuel mass, both beneficial and adverse, will be reviewed, focussing on the lessons learned for future D-T operation.
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