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

plasma response

ASDEX-Upgrade

Författare

L. Li

Donghua University

Forschungszentrum Jülich

Ministry of Education China

Yueqiang Liu

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

A. Kirk

Culham Lab

N. Wang

Forschungszentrum Jülich

Huazhong University of Science and Technology

Y. Liang

Institute of Plasma Physics Chinese Academy of Sciences

Forschungszentrum Jülich

Donghua University

D. Ryan

Culham Lab

University of York

W. Suttrop

Max Planck-institutet

M. Dunne

Max Planck-institutet

R. Fischer

Max Planck-institutet

J. C. Fuchs

Max Planck-institutet

B. Kurzan

Max Planck-institutet

P. Piovesan

Consorzio Rfx

M. Willensdorfer

Max Planck-institutet

F. C. Zhong

Donghua University

Nuclear Fusion

0029-5515 (ISSN)

Vol. 56 Art. no. 126007- 126007

Ämneskategorier

Fysik

Fusion, plasma och rymdfysik

DOI

10.1088/0029-5515/56/12/126007