In present fusion research a strong effort is devoted to the studies of non-axisymmetric magnetic perturbations and consequent field ergodization on the external region of the plasma. On this topic interesting results can be drawn from the helical configuration observed in high-current regimes in reversed field pinches (RFPs) where the small edge helical ripple is sufficient to modulate the plasma-wall interaction and the plasma kinetic properties. This paper presents the most recent experimental results and physical interpretation of the phenomena observed in the edge region of the RFX-mod RFP device. Experimental observations indicate that plasma pressure and floating potential are spatially modulated according to the helical deformation. Helical flow is observed at the edge as a consequence of an ambipolar electric field. Emphasis will be devoted to the determination of the actual phase relation between magnetic perturbation and velocity perturbation. Evidence of the influence of the helical ripple on turbulence properties at the edge is also reported.

Vianello, N., Spizzo, G., Agostini, M., Scarin, P., Carraro, L., Cavazzana, R., et al. (2013). 3D effects on the RFX-mod boundary. NUCLEAR FUSION, 53(7) [10.1088/0029-5515/53/7/073025].

3D effects on the RFX-mod boundary

Martines E;
2013

Abstract

In present fusion research a strong effort is devoted to the studies of non-axisymmetric magnetic perturbations and consequent field ergodization on the external region of the plasma. On this topic interesting results can be drawn from the helical configuration observed in high-current regimes in reversed field pinches (RFPs) where the small edge helical ripple is sufficient to modulate the plasma-wall interaction and the plasma kinetic properties. This paper presents the most recent experimental results and physical interpretation of the phenomena observed in the edge region of the RFX-mod RFP device. Experimental observations indicate that plasma pressure and floating potential are spatially modulated according to the helical deformation. Helical flow is observed at the edge as a consequence of an ambipolar electric field. Emphasis will be devoted to the determination of the actual phase relation between magnetic perturbation and velocity perturbation. Evidence of the influence of the helical ripple on turbulence properties at the edge is also reported.
Articolo in rivista - Articolo scientifico
reversed field pinch; RFP; RFX-mod; plasma boundary;
English
12
Vianello, N., Spizzo, G., Agostini, M., Scarin, P., Carraro, L., Cavazzana, R., et al. (2013). 3D effects on the RFX-mod boundary. NUCLEAR FUSION, 53(7) [10.1088/0029-5515/53/7/073025].
Vianello, N; Spizzo, G; Agostini, M; Scarin, P; Carraro, L; Cavazzana, R; De Masi, G; Martines, E; Momo, B; Rea, C; Spagnolo, S; Spolaore, M; Zuin, M
File in questo prodotto:
File Dimensione Formato  
134 - NF 13 3D effects on RFX boundary.pdf

Solo gestori archivio

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 8.58 MB
Formato Adobe PDF
8.58 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

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: https://hdl.handle.net/10281/351652
Citazioni
  • Scopus 24
  • ???jsp.display-item.citation.isi??? 21
Social impact