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Kyungjin Kim,Yong-Su Na,Hyun-Seok Kim,M. Maraschek,E. Poli,J. Stober,H. Zohm,F. Felici,O. Sauter,Y.S. Park,L. Terzolo,ASDEX Upgrade team,TCV Team 한국물리학회 2016 Current Applied Physics Vol.16 No.8
An integrated numerical system is established to model time-dependent behavior of the neoclassical tearing mode (NTM) in a tokamak which solves the modified Rutherford equation (MRE) by coupling with plasma transport, equilibrium, heating and current drive. The MRE is formulated in a simple form to be well-suited for time-dependent simulations including a predictive purpose for the feedback controller design by coupling the electron cyclotron effect self-consistently. In particular the electron cyclotron heating (ECH) effect is newly included to the MRE in addition to the electron cyclotron current drive (ECCD) effect to investigate their impact to stabilize the NTM. The integrated numerical system is applied to experiments for benchmarking in which NTMs are stabilized by ECCD and by ECH at ASDEX Upgrade and TCV, respectively. The impact of ECCD and ECH on stabilizing NTMs is identified in the simulations.
Classen, I G J,Lauber, Ph,Curran, D,Boom, J E,Tobias, B J,Domier, C W,Luhmann Jr, N C,Park, H K,Garcia Munoz, M,Geiger, B,Maraschek, M,Van Zeeland, M A,da Graç,a, S Published jointly by The Institute of Physics and 2011 Plasma physics and controlled fusion Vol.53 No.12
<P>Detailed measurements of the 2D mode structure of Alfvén instabilities in the current ramp-up phase of neutral beam heated discharges were performed on ASDEX Upgrade, using the electron cyclotron emission imaging (ECEI) diagnostic. This paper focuses on the observation of reversed shear Alfvén eigenmodes (RSAEs) and bursting modes that, with the use of the information from ECEI, have been identified as beta-induced Alfvén eigenmodes (BAEs). Both RSAEs with first and second radial harmonic mode structures were observed. Calculations with the linear gyro-kinetic code LIGKA revealed that the ratio of the damping rates and the frequency difference between the first and second harmonic modes strongly depended on the shape of the <I>q</I>-profile. The bursting character of the BAE type modes, which were radially localized to rational <I>q</I> surfaces, was observed to sensitively depend on the plasma parameters, ranging from strongly bursting to almost steady state.</P>