Abstract
The effect of a toroidal field (TF) ripple on the formation and
performance of internal transport barriers (ITBs) has been studied in
JET. It was found that the TF ripple had a profound effect on the
toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a
lower rotation and reduced the rotational shear in the region where the
ITBs were formed. ITB triggering events were observed in all cases and
it is thought that the rotational shear may be less important for this
process than, for example, the q-profile. However, the increase
in the pressure gradient following the ITB trigger was reduced in
discharges with a larger TF ripple and consequently a lower rotational
shear. This suggests that toroidal rotation and its shear play a role in
the growth of the ITB once it has been triggered.
Original language | English |
---|---|
Article number | 065008 |
Number of pages | 12 |
Journal | Plasma Physics and Controlled Fusion |
Volume | 50 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A1 Journal article-refereed |