Journal ArticleDOI
Parallel equilibrium current effect on existence of reversed shear Alfvén eigenmodes
Huasheng Xie,Yong Xiao +1 more
TLDR
In this paper, a fast global eigenvalue code was developed to study the reversed shear Alfven eigenmode (RSAE) in tokamak plasmas.Abstract:
A new fast global eigenvalue code, where the terms are segregated according to their physics contents, is developed to study Alfven modes in tokamak plasmas, particularly, the reversed shear Alfven eigenmode (RSAE). Numerical calculations show that the parallel equilibrium current corresponding to the kink term is strongly unfavorable for the existence of the RSAE. An improved criterion for the RSAE existence is given for with and without the parallel equilibrium current. In the limits of ideal magnetohydrodynamics (MHD) and zero-pressure, the toroidicity effect is the main possible favorable factor for the existence of the RSAE, which is however usually small. This suggests that it is necessary to include additional physics such as kinetic term in the MHD model to overcome the strong unfavorable effect of the parallel current in order to enable the existence of RSAE.read more
Citations
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Journal ArticleDOI
Unconventional ballooning structures for toroidal drift waves
Huasheng Xie,Yong Xiao +1 more
TL;DR: In this article, a broad class of unconventional ballooning structures are found to localize at arbitrary poloidal positions or with multiple peaks in the pedestal of high confinement mode (H-mode) fusion plasmas.
Journal ArticleDOI
Toroidal Alfvén eigenmode driven by energetic electrons during high-power auxiliary heating on HL-2A
Liming Yu,W. Chen,X. T. Ding,Xiaoquan Ji,Z. B. Shi,B. S. Yuan,R. R. Ma,Shengqiu Chen,Y. G. Li,J. X. Li,Shaodong Song,Z. C. Yang,P. W. Shi,Min Jiang,Y. P. Zhang,M. Huang,W. Li,B. B. Feng,Y. Zhou,Rui Ma,X. M. Song,D. L. Yu,J.Y. Cao,B. Lu,Jiaqi Dong,Yi. Liu,W. L. Zhong,Longwen Yan,Qingwei Yang,M. Xu,Xuru Duan,Y. Liu +31 more
TL;DR: In this article, the Toroidal Alfven eigenmodes (TAEs) driven by energetic electrons have been observed first during high-power electron cyclotron resonant heating and neutral beam injection on HL-2A.
Journal ArticleDOI
Core-localized Alfvénic modes driven by energetic ions in HL-2A NBI plasmas with weak magnetic shears
W. Chen,Liming Yu,X.T. Ding,Huasheng Xie,Zhongbing Shi,Xiaoquan Ji,D.L. Yu,Y.P. Zhang,P.W. Shi,Y.G. Li,B.B. Feng,Min Jiang,W.L. Zhong,J.Y. Cao,X.M. Song,Min Xu,Yu-Hong Xu,Longwen Yan,Yi Liu,Qingwei Yang,Xuru Duan,Hl A Team +21 more
TL;DR: In this paper, the authors focus on the high-frequency RSAE (HFRSAE) and resonant kinetic ballooning mode (rKBM) in HL-2A NBI plasmas with weak magnetic shears.
Journal ArticleDOI
Beta induced Alfvén eigenmode driven by energetic ions on the HL-2A tokamak
P.W. Shi,W. Chen,Zhongbing Shi,Xuru Duan,Z.C. Yang,R. R. Ma,W.L. Zhong,Min Jiang,Liming Yu,A.S. Liang,Jie Wen,D.L. Yu,Yong Liu,Qingwei Yang +13 more
TL;DR: In this article, the results suggest that the BAEs are highly localized at the normalized radius of −0.26, and the radial mode structures have been detected by the multi-channel microwave reflectometer and soft x-ray arrays.
Journal ArticleDOI
Radially localized kinetic beta induced Alfven eigenmodes in tokamak plasmas
TL;DR: In this article, a fast global eigenvalue solving code was developed to find even and odd parity KBAEs radially localized at the rational surface with the presence of the kinetic effects, namely the finite ion Larmor radius effects.
References
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Journal ArticleDOI
Low-n shear Alfven spectra in axisymmetric toroidal plasmas
Chio-Zong Cheng,M. S. Chance +1 more
TL;DR: In this article, it was shown both analytically and numerically that the toroidicity not only breaks up the shear Alfven continuous spectrum, but also creates new discrete toroidic induced shear eigenmodes with frequencies inside the continuum gaps.
Journal ArticleDOI
Ideal magnetohydrodynamic theory of magnetic fusion systems
TL;DR: In this article, Ideal magnetohydrodynamic theory and its application to magnetic fusion systems are reviewed and the stability properties of such equilibria are investigated, including general stability properties and applications to those concepts of current fusion interest.
Journal ArticleDOI
Excitation of the toroidicity-induced shear Alfvén eigenmode by fusion alpha particles in an ignited tokamak
Guoyong Fu,J. W. Van Dam +1 more
TL;DR: In this article, the toroidicity-induced shear Alfven eigenmode was found to be destabilized by fusion alpha particles in an ignited tokamak plasma.
Journal ArticleDOI
Kinetic theory of low-frequency Alfvén modes in tokamaks
TL;DR: The kinetic theory of low-frequency Alfven modes in tokamaks is presented in this paper, with the inclusion of both diamagnetic effects and finite core-plasma ion compressibility.
Journal ArticleDOI
Theoretical Interpretation of Alfvén Cascades in Tokamaks with Nonmonotonic q Profiles
TL;DR: Alfv\'en spectra in a reversed-shear tokamak plasma with a population of energetic ions exhibit a quasiperiodic pattern of primarily upward frequency sweeping as mentioned in this paper.