Suppression of plasma turbulence during optimized shear configurations in JET
Correlation of density turbulence suppression and reduced plasma transport is observed in the internal transport barrier (ITB) region of JET tokamak discharges with optimized magnetic shear. The suppression occurs in two stages. First, low frequency turbulence and ion transport are reduced across the plasma core by a toroidal velocity shear generated by intense auxiliary heating. Then with the ITB formation, high frequency turbulence and electron transport are reduced locally within the steep pressure gradient region of the ITB.
Conway
GD
JET Joint Undertaking, Abingdon, Oxfordshire OX14 3EA, United Kingdom.
Borba
DN
Alper
B
Bartlett
DV
Gormezano
C
von Hellermann MG
Maas
AC
Parail
VV
Smeulders
P
Zastrow
KD