scholarly journals The Mercier Criterion in Reversed Shear Tokamak Plasmas

10.2172/7819 ◽  
1999 ◽  
Author(s):  
C. Kessel ◽  
M.S. Chance ◽  
S.C. Jardin
Keyword(s):  
Tokamak Plasmas ◽  
Reversed Shear

Destabilization and nonlinear interaction of tearing modes in tokamak plasmas with locally reversed shear

2020 ◽  
Vol 27 (11) ◽  
pp. 114501
Author(s):  
Y. C. Feng ◽  
X. Q. Wang ◽  
Y. Xu ◽  
H. F. Liu ◽  
J. Huang ◽  
...  
Keyword(s):  
Nonlinear Interaction ◽  
Tokamak Plasmas ◽  
Tearing Modes ◽  
Reversed Shear

Bifurcation and Relaxation of Radial Electric Field in Enhanced Reversed Shear Tokamak Plasmas

1999 ◽  
Vol 83 (19) ◽  
pp. 3840-3843 ◽  
Author(s):  
K. C. Shaing ◽  
A. Y. Aydemir ◽  
R. Hiwatari ◽  
W. A. Houlberg ◽  
Y. Ogawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Tokamak Plasmas ◽  
Reversed Shear

scholarly journals The Mercier criterion in reversed-shear tokamak plasmas

1999 ◽  
Vol 41 (11) ◽  
pp. 1379-1392 ◽  
Author(s):  
M S Chance ◽  
C Kessel ◽  
S C Jardin
Keyword(s):  
Tokamak Plasmas ◽  
Reversed Shear

Global kinetic-MHD simulations of downward-sweeping reversed shear Alfvén eigenmodes in tokamak plasmas

2021 ◽  
Vol 61 (11) ◽  
pp. 116037
Author(s):  
Wanling Ge ◽  
Jialei Wang ◽  
Feng Wang ◽  
Zheng-Xiong Wang
Keyword(s):  
Tokamak Plasmas ◽  
Mhd Simulations ◽  
Alfven Eigenmodes ◽  
Reversed Shear

Interaction between energetic-ions and internal kink modes in a weak shear tokamak plasma

2021 ◽  
Author(s):  
Xiaolong Zhu ◽  
Feng Wang ◽  
Wei Chen ◽  
Zhengxiong Wang
Keyword(s):  
Nonlinear Dynamics ◽  
Resonance Condition ◽  
Particle Interaction ◽  
Critical Value ◽  
Mode Frequency ◽  
Tokamak Plasma ◽  
Tokamak Plasmas ◽  
Energetic Ions ◽  
Kink Mode ◽  
Reversed Shear

Abstract Based on the conventional tokamak HL-2A-like parameters and profiles, the linear properties and the nonlinear dynamics of non-resonant kink mode (NRK) and non-resonant fishbone instability (NRFB) in reversed shear tokamak plasmas are investigated by using the global hybrid kinetic-magnetohydrodynamic (MHD) nonlinear code M3D-K. This work mainly focuses on the effect of passing energetic-ions on the NRK and NRFB instabilities, which is different from the previous works. It is demonstrated that the NRFB can be destabilized by the passing energetic-ions when the energetic-ion beta $\beta_h$ exceeds a critical value. The transition from NRK to NRFB occurs when the energetic-ion beta $\beta_h$ increases to above a critical value. The resonance condition responsible for the excitation of NRFB is interestingly found to be satisfied at $\omega_t+\omega_p\approx\omega$, where $\omega_t$ is the toroidal motion frequency, $\omega_p$ is the poloidal motion frequency and $\omega$ is the mode frequency. The nonlinear evolutions of NRFB's mode structures and Poincar\'{e} plots are also analyzed in this work and it is found that the NRFB can induce evident energetic-ion loss/redistribution, which can degrade the performance of the plasmas. These findings are conducive to understanding the mechanisms of NRFB-induced energetic-ion loss/redistribution through nonlinear wave-particle interaction.

Ion Heating Characteristics of Merging Spherical Tokamak Plasmas using the Improved Doppler Tomography Spectroscopy System

2014 ◽  
Vol 134 (9) ◽  
pp. 523-524
Author(s):  
Hideya Koike ◽  
Masanobu Annoura ◽  
Kento Nishida ◽  
Hiroshi Tanabe ◽  
Michiaki Inomoto ◽  
...  
Keyword(s):  
Spherical Tokamak ◽  
Tokamak Plasmas ◽  
Ion Heating ◽  
Doppler Tomography ◽  
Spectroscopy System
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