Counter differential rigid-rotation equilibrium of electrically non-neutral two-fluid plasma with finite pressure. (31st August 2021)

• Record Type: Journal Article
• Authors: Nakajima, Y.; Himura, H.; Sanpei, A.
• Is Part Of: Journal of plasma physics. Volume 87:Number 4(2021)
• Publication Date: 2021-08-31
• Subjects: strongly coupled plasmas -- plasma dynamics -- plasma confinement; Plasma (Ionized gases) -- Periodicals; 530.4405
• DOI: 10.1017/S0022377821000854
• Languages: English
• ISSNs: 0022-3778

Abstract

Abstract : We derive the two-dimensional counter-differential rotation equilibria of two-component plasmas, composed of both ion and electron ($e^-$ ) clouds with finite temperatures, for the first time. In the equilibrium found in this study, as the density of the $e^{-}$ cloud is always larger than that of the ion cloud, the entire system is a type of non-neutral plasma. Consequently, a bell-shaped negative potential well is formed in the two-component plasma. The self-electric field is also non-uniform along the $r$ -axis. Moreover, the radii of the ion and $e^{-}$ plasmas are different. Nonetheless, the pure ion as well as $e^{-}$ plasmas exhibit corresponding rigid rotations around the plasma axis with different fluid velocities, as in a two-fluid plasma. Furthermore, the $e^{-}$ plasma rotates in the same direction as that of $\boldsymbol {E \times B}$, whereas the ion plasma counter-rotates overall. This counter-rotation is attributed to the contribution of the diamagnetic drift of the ion plasma because of its finite pressure.