Effect of electron temperature anisotropy on TEM in reversed-field-pinch plasmas

Yao，Y.1; Liu，T. C.1; Liu，S. F.1; Zhu，K. E.1; Kong，W.2; Li，J. C.3; Dong，J. Q.4

2022-08-01

10.1088/1741-4326/ac6f67

NUCLEAR FUSION   Impact Factor & Quartile

0029-5515

1741-4326

For the first time in the reversed-field-pinch configuration, trapped electron mode (TEM) with anisotropies of electron temperature and its gradient is studied by solving the gyrokinetic integral eigenmode equation. Detailed numerical analyses indicate that TEM is enhanced by the anisotropy with temperature in the direction perpendicular to the magnetic field that is higher than that in the direction parallel to the magnetic field when the latter is kept constant. However, the enhancement is limited, such that TEM is weakened and even stabilized when the anisotropy is higher than a critical value, due to strong Landau damping. In comparison with the isotropic case, the lower Landau damping with the higher parallel electron temperature makes TEM instability easier to excite, which expands the TEM unstable region in the diagram of density and temperature scale lengths. In addition, it is found that the electron temperature gradient in the perpendicular direction offers a stronger driving force on TEM instability than that in the parallel direction. The overall effects of the temperature gradients of electrons and ions, magnetic shear, safety factor and density gradient on TEM in the presence of the anisotropies are presented in detail.

anisotropies of electron temperature and its gradient gyrokinetic theory reversed-field-pinch plasmas trapped electron mode

SCI ; EI

English

Others

WOS:000813918400001

20222712328409

Anisotropy ; Damping ; Magnetic fields ; Magnetoplasma ; Safety factor ; Shear flow ; Thermal gradients ; Tokamak devices

Fusion Reactors:621.2 ; Fluid Flow, General:631.1 ; Thermodynamics:641.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Accidents and Accident Prevention:914.1 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Plasma Physics:932.3

PHYSICS

2-s2.0-85133419427

Scopus

1.School of Physics,Nankai University,Tianjin,300071,China
2.College of Science,Civil Aviation University of China,Tianjin,300300,China
3.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
4.Southwestern Institute of Physics,Chengdu,610041,China

Yao，Y.,Liu，T. C.,Liu，S. F.,et al. Effect of electron temperature anisotropy on TEM in reversed-field-pinch plasmas[J]. NUCLEAR FUSION,2022,62(8).

Yao，Y..,Liu，T. C..,Liu，S. F..,Zhu，K. E..,Kong，W..,...&Dong，J. Q..(2022).Effect of electron temperature anisotropy on TEM in reversed-field-pinch plasmas.NUCLEAR FUSION,62(8).

Yao，Y.,et al."Effect of electron temperature anisotropy on TEM in reversed-field-pinch plasmas".NUCLEAR FUSION 62.8(2022).