The ITER scenarios and the project of DEMO involve stable operation above the Greenwald density, which justifies efforts to understand and overcome the density limit, this last observed as a disruptive termination of tokamak discharges and a thermal crash (with no disruption) of stellarator and reversed-field pinch (RFP) ones. Both in the tokamak and the RFP, new findings show that the high density limit is not governed by a unique, theoretically well-determined physical phenomenon, but by a combination of complex mechanisms involving two-fluid effects, electrostatic plasma response to magnetic islands and plasma-wall interaction. In this paper we will show new evidence challenging the traditional picture of the 'Greenwald limit', in particular with reference to the role of thermal instabilities and the edge radial electric field Er in the development of this limit.

Spizzo, G., Pucella, G., Tudisco, O., Zuin, M., Agostini, M., Alessi, E., et al. (2015). Density limit studies in the tokamak and the reversed-field pinch. NUCLEAR FUSION, 55(4) [10.1088/0029-5515/55/4/043007].

Density limit studies in the tokamak and the reversed-field pinch

MARTINES, EMILIO;
2015

Abstract

The ITER scenarios and the project of DEMO involve stable operation above the Greenwald density, which justifies efforts to understand and overcome the density limit, this last observed as a disruptive termination of tokamak discharges and a thermal crash (with no disruption) of stellarator and reversed-field pinch (RFP) ones. Both in the tokamak and the RFP, new findings show that the high density limit is not governed by a unique, theoretically well-determined physical phenomenon, but by a combination of complex mechanisms involving two-fluid effects, electrostatic plasma response to magnetic islands and plasma-wall interaction. In this paper we will show new evidence challenging the traditional picture of the 'Greenwald limit', in particular with reference to the role of thermal instabilities and the edge radial electric field Er in the development of this limit.
Articolo in rivista - Articolo scientifico
and computerized simulation; boundary layer effects; design; particle orbit and trajectory; particle orbits; plasmamaterial interactions; theory; two-fluid and multi-fluid plasmas;
English
10
Spizzo, G., Pucella, G., Tudisco, O., Zuin, M., Agostini, M., Alessi, E., et al. (2015). Density limit studies in the tokamak and the reversed-field pinch. NUCLEAR FUSION, 55(4) [10.1088/0029-5515/55/4/043007].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/349123
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