Speaker
Dr
Makoto Sasaki
(Kyushu University)
Description
We investigate the phase-space dynamics of spatially inhomogeneous turbulence with a transport barrier in the presence of EGAMs, based on the wave-kinetic equation. It is found that the trapped turbulence clumps leak across the transport barrier, and they can propagate in the turbulence stable region. As a result, turbulence is enhanced by EGAMs in the stable region, while turbulence suppression is obtained in the unstable region. The propagation of the turbulence is ballistic, with the phase velocity of the EGAM. Hence, there appear a new global characteristic velocity for turbulence dynamics, in addition to the local group velocity and that of the turbulence spreading. The propagation of trapped turbulence is different from processes such as turbulence spreading and avalanches.
Primary author
Dr
Makoto Sasaki
(Kyushu University)
Co-authors
Prof.
Kimitaka Itoh
(Chubu University)
Prof.
Klaus Hallatschek
(Max-Planck Institut fur Plasmaphysik)
Dr
Maxime Lesur
(Lorraine University)
Dr
Naohiro Kasuya
(Kyushu University)
Prof.
Sanae-I Itoh
(Kyushu University)
Dr
Yusuke Kosuga
(Kyushu University)
