学術雑誌論文

学術雑誌論文

Physics of Plasmas. 2006, 13(3), p. 032506

Nonlinear evolution of the m=1 internal kink mode in the presence of magnetohydrodynamic turbulence

American Institute of Physics

英語

2006-03

https://doi.org/10.1063/1.2179772

A. Bierwage et al., Physics of Plasmas 13, 032506 (2006) https://doi.org/10.1063/1.2179772

The nonlinear evolution of the m=1 internal kink mode is studied numerically in a setting where the tokamak core plasma is surrounded by a turbulent region with low magnetic shear. As a starting point, we choose configurations with three nearby q=1 surfaces where triple tearing modes (TTMs) with high poloidal mode numbers m are unstable. While the amplitudes are still small, the fast-growing high- m TTMs enhance the growth of the m=1 instability. This is interpreted as a fast sawtooth trigger mechanism. The TTMs lead to a partial collapse, leaving behind a turbulent belt with q≃1 around the unreconnected core plasma. Although, full reconnection can occur if the core displacement grows large enough, it is shown that the turbulence may actively prevent further reconnection. This is qualitatively similar to experimentally observed partial sawtooth crashes with post-cursor oscillations due to a saturated internal kink. © 2006 American Institute of Physics.

This article may be downloaded for personal use only. Any other use requires prior permission of the author andAIP Publishing. This article appeared in Physics of Plasmas 13, 032506 (2006) and may be found at https://doi.org/10.1063/1.2179772.

78482

Nonlinear evolution of the m=1 internal kink mode in the presence of magnetohydrodynamic turbulence

American Institute of Physics

英語

2006-03

Physics of Plasmas

13

3

032506

https://doi.org/10.1063/1.2179772

https://hdl.handle.net/11094/78482