7th Asia-Pacific Conference on Plasma Physics, 12-17 Nov, 2023 at Port Messe Nagoya

European machine enhancements for the JT-60SA Tokamak

J. Ayllon-Guerola1, C. Sozzi2, G.L. Falchetto3, M. Akimitsu4, D. Carralero5, M. Cavinato6, S. Coda7,S. Davis6, C. Day8, M. Dibon9, J. Figueiredo10,11, K. Fukui4, J. Garcia3, G. Giruzzi3, N. Hajnal6, A.
Jokinen6, V.G. Kiptily12, P. Lang9, E. Laszynska13, A. Moro2, K. Mikszuta-Michalik13, S.
Nakamura4, T. Nakano4, M. Nocente14, Y. Ohtani4, R. Pasqualotto15, E. Perelli2, G. Phillips6, D.
Rigamonti2, S. Sumida4, T. Szepesi16, H. Tojo4, M. Valisa15, M. Wanner6, S. Yamamoto4
1
Department of Mechanical Engineering and Manufacturing, University of Seville, Spain, 2Institute for Plasma Science and Technology, National Research Council of Italy, Milan, Italy, 3CEA, IRFM, Saint-Paul-lez-Durance, France, 4 National Institutes for Quantum and Radiological
Science and Technology, Naka, Ibaraki, Japan, 5 Laboratorio Nacional de Fusion, CIEMAT, Spain, 6Fusion for Energy, Garching, Germany, 7 EPFL, Swiss Plasma Center, Lausanne, Switzerland, 8Institute for Technical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany, 9Max-Planck-Institut für Plasmaphysik, Germany, 10 EUROfusion Programme Management Unit,Garching, Germany, 11 Instituto de Plasma e Fusão Nuclear, Instituto Superior Técnico, Universidad
de Lisboa 1049-001 Lisboa, Portugal, 12 UKAEA Fusion Association, Culham Science Centre,Abingdon, UK, 13 Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland, 14Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Milano, Italy, 15 Consorzio RFX,Padova, Italy, 16 Centre for Energy Research, Budapest, Hungary
e-mail (speaker): jayllon@us.es (J. Ayllon-Guerola)
The JT-60SA Tokamak is an experimental fusion
device jointly designed, built and exploited by Japan andEurope under the framework of the Broader Approach
Agreement and the Japanese National Fusion Programme[1]. Due to its capability to produce long-pulse, high-β,
and highly shaped plasmas, the JT-60SA project has two
main missions: to support the ITER experimental
programme as a satellite machine, and to provide
complementary research to ITER in order to develop thedesign basis for DEMO, the next step of the international
fusion programme.
To timely meet its scientific objectives [2][3], theJT-60SA Tokamak will be sequentially upgraded withdifferent components, including operational anddiagnostic systems. Part of these enhancements are being
developed by Europe (EUROfusion WPSA Wokpackage),
to be installed during the upcoming years, in close
collaboration with the implementing agencies F4E andQST (host entity). The implementation plan of eachenhancement is aligned with the current timeline for themachine operation and maintenance phases and with thescientific priorities established by the Experiment Team
(integrated by experts from EUROfusion and QST).
The first set of EUROfusion European machineenhancements is currently in implementation phase andis integrated by 3 operational systems (Divertor
Cryopumps, a Pellet Launching System and a Massive
Gas Injection System) and 4 diagnostic systems (a Fast
Wide Angle Video Diagnostic System, a Visible
Ultra-Violet Divertor Spectrometer, a Thomson

Scattering Spectrometer and a Fast-ion Loss Detector).
A second set of enhancements is currently
transitioning from “feasibility study phase” to“implementation phase”. It is formed by a group of 5diagnostics (a Tangential Phase Contrast Imaging System,a Doppler Reflectometry System, Gamma-ray and
Neutron Detectors and an Electron Cyclotron Stray
Radiation
Detection
System,currently
underconsideration to be used as a test bed for the ITER
equivalent system).
Other enhancements with European participation,such as the Actively Cooled Divertor and the Electron
Cyclotron Resonant Heating power supply andtransmission lines, are being developed by F4E and QST
together with different European and Japaneseinstitutions.
In this contribution, an overview of the main
characteristics will be provided for each system beingconsidered, with a special focus on the diagnostics, alongwith an update on their development status and on theplanned implementation timeline.
References[1] P. Barabaschi et al, Nucl. Fusion 59 112005 (2019)[2] JT-60SA Research Unit, ‘JT-60SA Research Plan:
Research Objectives and Strategy’, v4.0 (2018)[3] G. Giruzzi et al, Plasma Phys. Control. Fusion 62014009 (2020)