Plasma and Fusion Research
Volume 13, 3403083 (2018)
Regular Articles
- Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan
- 1)
- Southwestern Institute of Physics, Chengdu 610041, China
Abstract
We study linear micro-instabilities using parameters referring to HL-2A plasma with ion Internal Transport Barrier (ITB) by means of the global toroidal gyrokinetic code GKNET including kinetic electron dynamics. It is found that a type of drift mode, which real frequency is low and changes the sign from electron diamagnetic direction to that of ion continuously as the poloidal wavenumber increases, dominates plasmas with peaked density profile while with relatively flat ion/electron temperature profiles. The instability is found to be sensitive to the perpendicular electron temperature Te⊥, similar to the standard trapped electron mode, which is consistent with the observation of ion-ITB collapse after ECRH in the HL-2A experiment.
Keywords
gyrokinetic simulation, ITG mode, TEM, density gradient driven TEM, ITB
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References
- [1] D.L. Yu et al., Nucl. Fusion 56, 056033 (2016).
- [2] K. Imadera et al., Proc. 26th Int. Conf. on Fusion Energy, TH/P3-3 (2016).
- [3] K. Imadera et al., Proc. 25th Int. Conf. on Fusion Energy, TH/P5-8 (2014).
- [4] A.J. Brizard and T.S. Hahm, Rev. Mod. Phys. 79, 421 (2007).
- [5] Y. Kishimoto et al., Plasma Phys. Control. Fusion 41, A663 (1999).
- [6] A.M. Dimits et al., Phys. Plasmas 7, 969 (2000).
- [7] J.Y. Kim and H.S. Han, Phys. Plasmas 24, 072501 (2017).
- [8] T.S. Hahm, Phys. Fluids B 3, 1445 (1991).