Drift kinetic effects on plasma response in high beta spherical tokamak experiments

Nuclear Fushion

article

Zhirui Wang¹  Jong-Kyu Park¹  Jonathan E. Menard¹  Yueqiang Liu²  Stanley M. Kaye¹  Stefan Gerhardt¹ 

[1] Princeton Plasma Physics Laboratory Princeton;General Atomics

关键词: kinetic effects;    plasma response;    spherical tokamak;    NSTX;   

DOI  :  10.1088/1741-4326/aa8e08

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The highβplasma response to rotating n=1external magnetic perturbations is numerically studied and compared with the National Spherical Torus Experiment (NSTX). The hybrid magnetohydrodynamic(MHD)-kinetic modeling shows that drift kinetic effects are important in resolving the disagreement of plasma response between the ideal MHD prediction and the NSTX experimental observation when plasma pressure reaches and exceeds the no-wall limit (Troyonet al1984Plasma Phys. Control. Fusion26209). Since the external rotating fields and high plasma rotation are presented in the NSTX experiments, the importance of the resistive wall effect and plasma rotation in determining the plasma response is also identified, where the resistive wall suppresses the plasma response through the wall eddy current. The inertial energy due to plasma rotation destabilizes the plasma. The complexity of the plasma response in this study indicates that MHD modeling, including comprehensive physics, e.g. the drift kinetic effects, resistive wall and plasma rotation, are essential in order to reliably predict the plasma behavior in a high beta spherical tokamak device.

【 授权许可】

Unknown