Modelling plasma response to RMP fields in ASDEX Upgrade with varying edge safety factor and triangularity
Journal article, 2016

Toroidal computations are performed using the MARS-F code (Liu et al 2000 Phys. Plasmas 7 3681), in order to understand correlations between the plasma response and the observed mitigation of the edge localized modes (ELM) using resonant magnetic perturbation fields in ASDEX Upgrade. In particular, systematic numerical scans of the edge safety factor reveal that the amplitude of the resonant poloidal harmonic of the response radial magnetic field near the plasma edge, as well as the plasma radial displacement near the X-point, can serve as good indicators for predicting the optimal toroidal phasing between the upper and lower rows of coils in ASDEX Upgrade. The optimal coil phasing scales roughly linearly with the edge safety factor , for various choices of the toroidal mode number n = 1-4 of the coil configuration. The optimal coil phasing is also predicted to vary with the upper triangularity of the plasma shape in ASDEX Upgrade. Furthermore, multiple resonance effects of the plasma response, with continuously varying , are computationally observed and investigated.

plasma response

ASDEX-Upgrade

MARS-F

Author

L. Li

Ministry of Education China

Forschungszentrum Jülich

Donghua University

Yueqiang Liu

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

A. Kirk

Culham Lab

N. Wang

Huazhong University of Science and Technology

Forschungszentrum Jülich

Y. Liang

Forschungszentrum Jülich

Donghua University

Chinese Academy of Sciences

D. Ryan

Culham Lab

University of York

W. Suttrop

Max Planck Institute

M. Dunne

Max Planck Institute

R. Fischer

Max Planck Institute

J. C. Fuchs

Max Planck Institute

B. Kurzan

Max Planck Institute

P. Piovesan

Consorzio Rfx

M. Willensdorfer

Max Planck Institute

F. C. Zhong

Donghua University

Nuclear Fusion

0029-5515 (ISSN)

Vol. 56 12 Art. no. 126007- 126007

Subject Categories

Physical Sciences

Fusion, Plasma and Space Physics

DOI

10.1088/0029-5515/56/12/126007

More information

Latest update

10/2/2018