Abstract
The separate and synergistic effects of both the electron cyclotron current drive (ECCD) and poloidal shear flow on the tearing mode are investigated numerically by using two-dimensional compressible magnetohydrodynamics equations in slab geometry. For the misaligned ECCD, effects of radial and poloidal misalignments have been compared emphatically. It is found that the suppression effect of ECCD is weakened with the increase of malposed ratio and it is more sensitive to the radial misalignment. The stability effect of shear flow is not positively related to the flow shear; the effects of starting moment of ECCD and shear flow are similar but not identical. The synergistic stability effect of ECCD and shear flow is more effective than ECCD or shear flow acts alone on the tearing mode without considering the “flip” instability. Furthermore, the combinatorial stability effect is more obvious when ECCD has a radial misalignment as a result of the continuous poloidal shift of magnetic island.
Highlights
Tearing mode instability is one of the most significant magnetohydrodynamics (MHD) instabilities associated with energy conversion and plasma transport process in various magnetic confinement device including Tokamak-type.1–7 As the growing of magnetic islands, hot particles are lost more from the machine so that disruptions can be triggered
The toroidal rotation behavior and momentum transport have been examined in neutral beam injection (NBI) heated plasmas with and without electron cyclotron resonance heating (ECRH) and current drive (ECCD) in ASDEX Upgrade (AUG),61,62 DIII-D,63 JT-60U64 and TCV (Ref. 65)
The separate and synergistic effects of electron cyclotron current drive (ECCD) and shear flow on the tearing mode are studied without considering the “flip” instability
Summary
Tearing mode instability is one of the most significant magnetohydrodynamics (MHD) instabilities associated with energy conversion and plasma transport process in various magnetic confinement device including Tokamak-type. As the growing of magnetic islands, hot particles are lost more from the machine so that disruptions can be triggered. Borgogn, and Comisso et al. researched the magnetic island evolution under the action of ECCD based on the reduced resistive MHD plasma model. They found that the island can be completely annihilated when the driven current is applied to a small magnetic island, but it is followed by a spatial phase shift of the island due to the “flip” instability. The toroidal rotation behavior and momentum transport have been examined in NBI heated plasmas with and without electron cyclotron resonance heating (ECRH) and current drive (ECCD) in ASDEX Upgrade (AUG), DIII-D,63 JT-60U64 and TCV (Ref. 65). We first present a model of reduced resistive MHD and the initial condition and some parameters during the simulation, and report on the numerical results of the single and synergistic effects of ECCD and shear flow
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