Characterization of the I-phase regime at TCV

Aymerich E.;Cannas B.;Carcangiu S.;Fanni A.;Montisci A.;Pisano F.;Sias G.;
2025-01-01

Abstract

The I-phase is an H-mode confinement regime of tokamaks characterized by limit cycle oscillations, the so-called LCOs or bursts. These bursts are the manifestation of a periodic flattening of the plasma edge pressure profile. The profile flattening is caused by increased radial transport, driven by a high-frequency plasma edge mode that periodically appears. This short-living mode is intrinsically connected to each burst. It vanishes once the profiles are fully flattened, and it reestablishes during profile recovery once critical gradients are reached and a new cycle begins. In this paper, we describe for the first time the unambiguous presence of the I-phase at the tokamak `a configuration variable (TCV). As the I-phase confinement regime is found in the parameter regime between the L-mode and the fully developed H-mode, it is often confused with dithers between H-mode and L-mode. Therefore, we are highlighting the differences between these two phenomena. Furthermore, we show the two-dimensional dynamics of the I-phase mode and bursts and the associated filamentary transport, enabled by the outstanding capabilities of the 2D TCV Gas Puff Imaging diagnostics.
2025
2024
Inglese
65
1
016041
13
https://iopscience.iop.org/article/10.1088/1741-4326/ad96cb
Esperti anonimi
internazionale
scientifica
fusion
gas puff imaging
I-phase
LCO
limit cycle oscillations
plasma modes
TCV
Goal 7: Affordable and clean energy
Griener, M.; Wuthrich, C.; Wang, Y.; Brida, D.; Faitsch, M.; Offeddu, N.; Theiler, C.; Reimerdes, H.; Agostini, M.; Alessi, E.; Alberti, S.; Andrebe, ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
894
open
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