Modelling plasma response to RMP fields in ASDEX Upgrade with varying edge safety factor and triangularity
Artikel i vetenskaplig tidskrift, 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.
MARS-F
ASDEX-Upgrade
plasma response
Författare
L. Li
Ministry of Education China
Donghua University
Forschungszentrum Jülich
Yueqiang Liu
Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi
A. Kirk
Culham Science Centre
N. Wang
Forschungszentrum Jülich
Huazhong University of Science and Technology
Y. Liang
Forschungszentrum Jülich
Donghua University
Chinese Academy of Sciences
D. Ryan
Culham Science Centre
University of York
W. Suttrop
Max-Planck-Gesellschaft
M. Dunne
Max-Planck-Gesellschaft
R. Fischer
Max-Planck-Gesellschaft
J. C. Fuchs
Max-Planck-Gesellschaft
B. Kurzan
Max-Planck-Gesellschaft
P. Piovesan
Consorzio Rfx
M. Willensdorfer
Max-Planck-Gesellschaft
F. C. Zhong
Donghua University
Nuclear Fusion
0029-5515 (ISSN) 1741-4326 (eISSN)
Vol. 56 12 Art. no. 126007- 126007Ämneskategorier
Fysik
Fusion, plasma och rymdfysik
DOI
10.1088/0029-5515/56/12/126007