Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal

Details Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal

2012-03-07

arxiv.org/abs/1203.1571v1

Physics

Plasma Physics

4 pages, 6 figures

Scientific paper

Global gyrokinetic simulation is used to demonstrate that the high-$n$ kinetic ballooning mode (KBM) is the dominant instability in the tokamak edge pedestal assuming the bootstrap current locally flattens the $q$ profile in the steep pressure gradient region. This is true even for very localized and slight changes in the $q$ profile. In addition to the KBM, an intermediate-$n$ electromagnetic mode, with features similar to the MHD peeling-ballooning mode is found to be unstable. When the magnetic shear is weak in a small region near the steep pressure gradient, this intermediate-$n$ "kinetic peeling ballooning mode" is stabilized, while the high-$n$ KBM becomes more unstable and is found to be the most unstable mode. Collisions decrease the KBM's critical $\beta$ and increase the growth rate.

Affiliated with

Also associated with

No associations

Rating

Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bootstrap Current Destabilization of the Kinetic Ballooning Mode in the Tokamak Edge Pedestal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-395438