Articolo in rivista, 2021, ENG, 10.1088/1741-4326/abe3c7
Pucella G.; Buratti P.; Giovannozzi E.; Alessi E.; Auriemma F.; Brunetti D.; Ferreira D.R.; Baruzzo M.; Frigione D.; Garzotti L.; Joffrin E.; Lerche E.; Lomas P.J.; Nowak S.; Piron L.; Rimini F.; Sozzi C.; Van Eester D.
ENEA, Fusion and Nuclear Safety Department, C.R. Frascati, Italy; ISTP, Consiglio Nazionale Delle Ricerche, Milano, Italy; Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Padova, Italy; Culham Centre for Fusion Energy, Abingdon, Culham Centre for Fusion Energy, Abingdon, United Kingdom of Great Britain and Northern Ireland, United Kingdom; IPFN/IST, University of Lisbon, Lisbon, IPFN/IST, University of Lisbon, Portugal; Università Degli Studi di Roma Tor Vergata, Roma, Italy; CEA, IRFM, Saint-Paul-lez-Durance, France; Laboratory for Plasma Physics, Ecole Royale Militaire, Brussels, Belgium; Università Degli Studi di Padova, Padova, Italy.
In this work the onset of tearing modes in the termination phase of plasma pulses on JET is investigated. It is shown that the broadening or the shrinking of the current density profile, as a consequence of a core hollowing or an edge cooling of the electron temperature profile, strongly increases the probability of destabilizing a 2/1 tearing mode also in absence of an external trigger (e.g. a sawtooth crash). Two parameters are defined to highlight changes in the shape of the temperature profile that can lead to MHD instabilities and an empirical stability diagram is introduced into the space of the two new parameters. A large data-set of pulses carried out in the high-current scenario at JET with ITER-like wall is analyzed and criteria for the development of disruption alerts based on the two risk indicators for MHD instabilities are discussed, taking into account the different dynamics of the observed phenomena leading to the onset of 2/1 tearing modes.
Nuclear fusion (Online) 61 (4), pp. 046020-1–046020-12
tearing modes, plasma termination, JET, temperature hollowing, edge cooling, onset
Sozzi Carlo, Nowak Silvana, Alessi Edoardo, Auriemma Fulvio
ID: 453420
Year: 2021
Type: Articolo in rivista
Creation: 2021-04-29 15:47:59.000
Last update: 2024-01-09 07:27:04.000
CNR institutes
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
URL: https://iopscience.iop.org/article/10.1088/1741-4326/abe3c7/meta
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:453420
DOI: 10.1088/1741-4326/abe3c7
Scopus: 2-s2.0-85103180277
ISI Web of Science (WOS): 000629138100001