The effect of the E × B velocity shear on the particle flux carried by electrostatic fluctuations at the edge is discussed comparing the results of the experiments T2R (R = 1.2 m, a = 0.18 m) and RFX (R = 2 m, a = 0.5 m). In both experiments electrostatic turbulence accounts for most of the particle flux. The shear of the E × B velocity is close or larger than the value required for turbulence suppression or reduction. Particle fluxes exhibit bursts which carry a large fraction of the total particle flux, and which tend to cluster during magnetic relaxation phase. On the average a Bohm estimate of the experimental plasma diffusivity accounts for the experimental data. Finally a discussion on the methods for turbulence control is given. © 2003 Elsevier Science B.V. All rights reserved.

Antoni, V., Bergsaker, H., Serianni, G., Spolaore, M., Vianello, N., Cavazzana, R., et al. (2003). Anomalous particle transport and flow shear in the edge region of RFP's. JOURNAL OF NUCLEAR MATERIALS, 313-316, 972-975 [10.1016/S0022-3115(02)01572-6].

Anomalous particle transport and flow shear in the edge region of RFP's

Martines E;
2003

Abstract

The effect of the E × B velocity shear on the particle flux carried by electrostatic fluctuations at the edge is discussed comparing the results of the experiments T2R (R = 1.2 m, a = 0.18 m) and RFX (R = 2 m, a = 0.5 m). In both experiments electrostatic turbulence accounts for most of the particle flux. The shear of the E × B velocity is close or larger than the value required for turbulence suppression or reduction. Particle fluxes exhibit bursts which carry a large fraction of the total particle flux, and which tend to cluster during magnetic relaxation phase. On the average a Bohm estimate of the experimental plasma diffusivity accounts for the experimental data. Finally a discussion on the methods for turbulence control is given. © 2003 Elsevier Science B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
ExB; RFP; Transport; Turbulence; Velocity; Velocity shear;
English
972
975
4
Antoni, V., Bergsaker, H., Serianni, G., Spolaore, M., Vianello, N., Cavazzana, R., et al. (2003). Anomalous particle transport and flow shear in the edge region of RFP's. JOURNAL OF NUCLEAR MATERIALS, 313-316, 972-975 [10.1016/S0022-3115(02)01572-6].
Antoni, V; Bergsaker, H; Serianni, G; Spolaore, M; Vianello, N; Cavazzana, R; Regnoli, G; Spada, E; Martines, E; Bagatin, M; Drake, J
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/365831
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