Transport barrier inside the reversal surface in the chaotic regime of the reversed-field pinch.
Magnetic field lines and the corresponding particle orbits are computed for a typical chaotic magnetic field provided by a magnetohydrodynamics numerical simulation of the reversed-field pinch. The m = 1 modes are phase locked and produce a toroidally localized bulging of the plasma which increases particle transport. The m = 0 and m = 1 modes produce magnetic chaos implying poor confinement. However, they also allow for the formation of magnetic islands which induce transport barriers inside the reversal surface.
Spizzo
G
G
Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti, 4 35127 Padova, Italy.
Cappello
S
S
Cravotta
A
A
Escande
D F
DF
Predebon
I
I
Marrelli
L
L
Martin
P
P
White
R B
RB