Articolo in rivista, 2023, ENG, 10.1016/j.fusengdes.2023.113634

Radiation control in deuterium, tritium and deuterium-tritium JET baseline plasmas - part I

Piron L.; Van Eester D.; Frigione D.; Garzotti L.; Lomas P.J.; Lennholm M.; Rimini F.; Auriemma F.; Baruzzo M.; Carvalho P.J.; Ferreira D.R.; Field A.R.; Kirov K.; Stancar Z.; Stuart C.I.; Valcarcel D.

Dipartimento di Fisica G. Galilei, Università degli Studi di Padova, Italy; Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Padova, Italy; CNR ISTP - Istituto per la Scienza e Tecnologia dei Plasmi, Sede di Padova, Italy; Laboratory for Plasma Physics LPP-ERK/KMS, Bruxelles, Belgium; ENEA, Fusion and Nuclear Safety Department, C.R. Frascati, Rome, Italy; CCFE, Culham Science Centre, Abingdon, United Kingdom; Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico Universidade de Lisboa, Portugal.

The achievement of a steady ELMy H-mode phase with high ion temperature, but without a gradual rise in plasma radiation, has been a crucial point to establish high plasma performance scenarios in JET ITER-like-wall plasmas. Indeed, radiation events, due to the release of high Z impurities, such as Nickel and Copper, and W sputtered from the divertor, can strongly reduce the power crossing the plasma separatrix and slow the ELMs dynamics, thus inducing H to L transition. In particular, in JET baseline plasmas, because of the outward neoclassical transport [A.R. Field et al 2021 Plasma Phys. Control. Fusion 63 095013], plasma impurities are mainly localized in the mantle region, as detected by a real-time surrogate model for bolometer tomography based on machine learning [D.R. Ferreira et al 2021 Fusion Engineering and Design 164], and the consequent excessive radiation in this region is the main cause of plasma termination in recent Deuterium, Tritium and Deuterium-Tritium operations. To guarantee impurity accumulation being flushed by the ELMs, ELM control schemes, which ensure a throughput of particles, either via gas fueling and via pellets, have been exploited. In this work, the staged approach strategy towards radiation control, which allowed to sustain for more than 10 s Tritium and Deuterium-Tritium baseline discharges without radiation issues, is presented.

Fusion engineering and design (Print) 193 , pp. 113634-1–113634-5

Keywords

JET, Plasma, Real-time control, DT, Tritium operation, Radiation control, Plasma termination

CNR authors

Auriemma Fulvio

CNR institutes

ISTP – Istituto per la Scienza e Tecnologia dei Plasmi

ID: 480507

Year: 2023

Type: Articolo in rivista

Creation: 2023-04-18 17:06:26.000

Last update: 2023-05-08 17:07:39.000

CNR authors

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:480507

DOI: 10.1016/j.fusengdes.2023.113634

Scopus: 2-s2.0-85151814491

ISI Web of Science (WOS): 000966708800001