A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfv ́en frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.

Fast-ion-driven vertical modes in magnetically confined toroidal plasmas / Barberis, T.; Porcelli, F.; Yolbarsop, A.. - In: NUCLEAR FUSION. - ISSN 0029-5515. - ELETTRONICO. - 62:6(2022), p. 064002. [10.1088/1741-4326/ac5ad0]

Fast-ion-driven vertical modes in magnetically confined toroidal plasmas

Barberis, T.;Porcelli, F.;
2022

Abstract

A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfv ́en frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.
File in questo prodotto:
File Dimensione Formato  
Barberis_2022_Nucl._Fusion_62_064002.pdf

non disponibili

Descrizione: Articolo Principale
Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 788.4 kB
Formato Adobe PDF
788.4 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
2022_NFL_Fast_ion_driven_vertical_modes_in_magnetically_confined_toroidal_plasmas - accepted manuscript.pdf

embargo fino al 05/04/2023

Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Creative commons
Dimensione 461.27 kB
Formato Adobe PDF
461.27 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2960598