Cross-field transport by instabilities and blobs in a magnetized toroidal plasma.
The mechanisms for anomalous transport across the magnetic field are investigated in a toroidal magnetized plasma. The role of plasma instabilities and macroscopic density structures (blobs) is discussed. Examples from a scenario with open magnetic field lines are shown. A transition from a main plasma region into a loss region is reproduced. In the main plasma, which includes particle and heat source locations, the transport is dominated by the fluctuation-induced particle and heat flux associated with a plasma instability. On the low-field side, the cross-field transport is ascribed to the intermittent ejection of macroscopic blobs propagating toward the outer wall. It is shown that instabilities and blobs represent fundamentally different mechanisms for cross-field transport.
Podestà
M
M
Centre de Recherches en Physique des Plasmas-Ecole Polytechnique Fédérale de Lausanne (EPFL), Association EURATOM-Confédération Suisse, CH-1015 Lausanne, Switzerland. mpodesta@pppl.gov
Fasoli
A
A
Labit
B
B
Furno
I
I
Ricci
P
P
Poli
F M
FM
Diallo
A
A
Müller
S H
SH
Theiler
C
C