2024-03-29T05:47:57Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00000827
2022-12-19T03:41:56Z
75:121:122
9:10:11
Single-fluid stability of stationary plasma equilibria with velocity shear and magnetic shear
Miura, Akira
3204
450
plasma Alfven waves
plasma drift waves
plasma instability
Tokamak devices
By using incompressible single-fluid equations with a generalized Ohm’s law neglecting the electron inertia, a linear eigenmode equation for a magnetic field perturbation is derived for stationary equilibria in a slab geometry with velocity and magnetic shears. The general eigenmode equation contains a fourth-order derivative of the perturbation in the highest order and contains Alfvén and whistler mode components for a homogeneous plasma. The ratio of the characteristic ion inertia length to the characteristic inhomogeneity scale length is chosen as a small parameter for expansion. Neglecting whistler mode in the lowest order, the eigenmode equation becomes a second-order differential equation similar to the ideal magnetohydrodynamic eigenmode equation except for the fact that the unperturbed perpendicular velocity contains both electric and ion diamagnetic drifts. A sufficient condition for stability against the Kelvin–Helmholtz instability driven by shear in the ion diamagnetic drift velocity is derived and then applied to tokamaks.
journal article
American Institute of Physics
2009-10
application/pdf
Physics of plasmas
10
16
102107
AA10987555
1070664X
https://repository.dl.itc.u-tokyo.ac.jp/record/827/files/PP_16_10_102107.pdf
eng
info:doi/10.1063/1.3247873
http://doi.org/10.1063/1.3247873
© 2009 American Institute of Physics