Speaker
Mr
Akihiro Ishizawa
(Japan)
Description
Turbulent transport in high-beta toroidal plasmas is investigated by means of a newly developed simulation code solving electromagnetic gyrokinetic equations combined with gyro-fluid equations for electrons. The new code allows simulations of turbulent transport at high-beta with smaller computational cost and less numerical difficulty than solving gyrokinetic equations for both electrons and ions which have disparate spatio-temporal scales. The code is applicable to a model configuration of Large Helical Device (LHD) experiments as well as tokamaks, and linear calculations show that kinetic ballooning modes (KBMs) are destabilized at high-beta. A nonlinear simulation for a tokamak plasma shows that heat transport due to KBM at high-beta (beta=2%) is significantly larger than that due to ion temperature gradient mode (ITG) driven turbulence at zero beta because of high KBM growth rate and weak zonal flow.
Country or International Organization of Primary Author
Japan
Primary author
Mr
Akihiro Ishizawa
(Japan)
Co-authors
Prof.
Hideo Sugama
(National Institute for Fusion Science)
Prof.
Noriyoshi Nakajima
(National Institute for Fusion Science)
Dr
Shinya Maeyama
(Tokyo Institute of Technology)
Prof.
Tomohiko Watanabe
(National Institute for Fusion Science)
