Plasma and Fusion Research
Volume 8, 2403040 (2013)
Regular Articles
- Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
Abstract
The ion-temperature-gradient (ITG) mode instability in sheared slab geometry in the presence of a mesoscale magnetic island is investigated with a focus on the short-wavelength regime (kyρi > 1). We found that a static magnetic island causes radial and poloidal modes to couple and therefore plays a stabilizing role by allowing energy transfer from unstable modes to stable modes. However, for large island widths, the short-wavelength ITG mode becomes strongly destabilized and tends to dominate over the standard ITG mode (kyρi ≅ 0.5). A reduced model is proposed in this paper to understand this destabilization mechanism.
Keywords
gyrokinetics, ITG instability, magnetic island, numerical simulation, microturbulence
Full Text
References
- [1] A.I. Smolyakov, M. Yagi and Y. Kishimoto, Phys. Rev. Lett. 89, 125005 (2002).
- [2] Z. Gao, H. Sanuki, K. Itoh and J.Q. Dong, Phys. Plasmas 10, 2831 (2003).
- [3] Z. Gao, H. Sanuki, K. Itoh and J.Q. Dong, Phys. Plasmas 12, 022502 (2005).
- [4] J. Chowdhury, S. Brunner, R. Ganesh, X. Lapillonne, L. Villard and F. Jenko, Phys. Plasmas 19, 102508 (2012).
- [5] Z.X. Wang, J.Q. Li, Y. Kishimoto and J.Q. Dong, Phys. Plasma 16, 060703 (2009).
- [6] H.R. Strauss, J. Plasma Phys. 57, 83 (1997).
- [7] Y. Idomura, S. Tokuda and M. Wakatani, Phys. Plasmas 6, 4658 (1999).
- [8] P.P. Hilscher, K. Imadera, J.Q. Li and Y. Kishimoto, Zero-Carbon Energy Kyoto 2010 (Springer, 2011) p.239.
- [9] J. Li, L. Huang and W. Qu, Phys. Plasmas 5, 959 (1998).
This paper may be cited as follows:
Paul P. HILSCHER, Kenji IMADERA, Jiquan LI and Yasuaki KISHIMOTO, Plasma Fusion Res. 8, 2403040 (2013).