Speaker
Mingkun Han
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1107.pdf
Turbulent impurity transport of electrostatic drift wave in tokamak
plasmas
M. K. Han1,2, J. Q. Dong2,3, Z. X. Wang1 and Yong Shen2
1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of
Education), School of Physics, Dalian University of Technology, Dalian, 116024, China
2 Southwestern Institute of Physics, Chengdu, 610041, China
3 Institute of Fusion Theory and Simulation, Zhejiang University, Hangzhou, 310027,
China
Abstract
Experiments in tokamaks show that, in addition to neoclassical transport, small-scale
turbulence induced by drift instabilities plays a significant role in particle transport [1-3]. In
recent experiments on HL-2A, Tore Supra el al., it is found that the experimental threshold
(especially the critical gradients) is in well agreement with the one calculated with
gyrokinetic model [4]. Meanwhile, it is well known that the impurity problem is of great
importance since even a small quantity of impurity strongly enhances the radiation loss and
leads to the dilution of plasma reactivity [5-6].
In order to investigate the turbulent impurity transport of electrostatic drift wave, the
quasilinear particle transport is considered in the toroidal gyrokinetic integral code HD7.
Detailed analyses about the dependence of particle flux on plasma parameters, especially
the gradient thresholds are performed. Comparing various electrostatic drift instabilities, it
reveals that the impurity transport induced by impurity ions is of great significance in
contrast with other electrostatic instabilities and is expected to have significant influence on
plasma transport and confinement.
References
[1] X. Garbet et al, Phys. Rev. Lett. 91; J. Weiland et al, Nucl. Fusion 29
[2] C. Angioni et al, Plasma Phys. Control Fusion 51
[3] M. K. Han et al, Nucl. Fusion 57
[4] D. Villegas et al, Phys. Rev. Lett. 105; W. L. Zhong et al, Phys. Rev. Lett. 117
[5] B. Coppi et al, Phys. Rev. Lett. 17
[6] Yong Shen et al, Nucl. Fusion 58
