Speaker
Akihiro Ishizawa
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1038.pdf
Electromagnetic global gyrokinetic simulation for the analysis of MHD
instabilities and turbulence
A. Ishizawa1, K. Imadera1, Y. Nakamura1, Y. Kishimoto1
1
Graduate School of Energy Science, Kyoto University, Uji, Janan
Sustaining burning plasmas requires good confinement of energetic particles
produced by fusion reaction and of bulk plasmas heated by these particles. In order to achieve
good confinement of them simultaneously, we need to understand turbulent transport of bulk
plasma and transport of energetic particles due to macro-MHD instability such as toroidal
Alfven eigen-modes. The electromagnetic turbulence dominates bulk plasma transport at
finite beta [1] and interacts with MHD instabilities, and their saturation levels depend on their
mutual interactions [2], and thus understanding interaction between MHD instabilities and
turbulence is one of the critical issues.
Our study is aim to understand MHD instabilities in burning plasmas, which are
influenced by high energy particles produced from fusion reaction. In addition, we will study
the MHD instabilities interacting with micro-turbulence through multi-scale nonlinear
interactions. We are constructing a first principle simulation code of magnetically confined
plasmas to evaluate the transport of energetic particles and of bulk plasmas simultaneously
and self-consistently by means of numerical simulations of the MHD instabilities and
micro-turbulence.
The code is developed by extending GKNET [3] which is a global electrostatic
gyrokinetic simulation code, so that the new code is applicable to the analysis of
electromagnetic instabilities. The code enables us to investigate electromagnetic drift-wave
instabilities such as the electromagnetic ion temperature gradient (ITG) modes mode and
electromagnetic trapped electron modes (TEM) as well as MHD instabilities such as kinetic
ballooning modes (KBM) and the tearing mode. We will evaluate the transport of energetic
particles and bulk plasmas due to MHD instabilities and micro-turbulence, and invesitigate
nonlinear interaction between them by using the new code.
[1] A. Ishizawa, S. Maeyama, T.-H. Watanabe, et.al., J. Plasma Phys., (2015) 435810203.
[2] A. Ishizawa and N. Nakajima, Nucl. Fusion, (2009) 055015.
[3] K. Imadera, Y. Kishimoto, et.al., IAEA-FEC, (2014).
