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17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Gyrokinetic simulations of electrostatic microinstabilities with bounce-averaged kinetic electrons for shaped tokamak plasmas

19 Oct 2016, 08:30
4h
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Poster THC - Magnetic Confinement Theory and Modelling: Confinement Poster 3

Speaker

Dr Lei Qi (National Fusion Research Institute, Daejeon, Korea)

Description

Nonlinear bounce-averaged kinetic theory[B.H. Fong and T.S. Hahm, Phys. Plasmas 6, 188 (1999)] is used for magnetically trapped electrons for the purpose of achieving efficient gyrokinetic simulations of Trapped Electron Mode (TEM) and Ion Temperature Gradient mode with trapped electrons (ITG-TEM) in shaped tokamak plasmas. Bounce-averaged kinetic equations are explicitly extended to shaped plasma equilibria from the previous ones for concentric circular plasmas, and implemented to a global nonlinear gyrokinetic code, Gyro-Kinetic Plasma Simulation Program (gKPSP)[J.M. Kwon et al., Phys. Plasmas 21, 013004 (2012)]. Verification of gKPSP with bounce-averaged kinetic trapped electrons in shaped plasmas is successfully carried out for linear properties of ITG-TEM mode and Rosenbluth-Hinton residual zonal flow[M.N. Rosenbluth and F.L. Hinton, Phys. Rev. Lett. 80, 724 (1998)]. Physics responsible for stabilizing effects of elongation on both ITG mode and TEM is identified using global gKPSP simulations. These can be understood in terms of magnetic flux expansion leading to the effective temperature gradient R/L_T(1-E’)[P. Angelino, et al., PRL 102, 195002 (2009)] and poloidal wave length contraction at low field side resulting in the effective poloidal wave number k_theta*rho_i/kappa.
Country or International Organization South Korea
Paper Number TH/P3-4

Primary author

Dr Lei Qi (National Fusion Research Institute, Daejeon, Korea)

Co-authors

Dr Gahyung Jo (National Fusion Research Institute & Yonsei university, Korea) Dr Jaemin Kwon (National Fusion Research Institute, Daejeon, Korea) Prof. Taik Soo Hahm (Seoul National University & National Fusion Research Institute, Korea)

Presentation materials