On the radial eigenmode structure of drift wave instability with inhomogeneous damping in cylindrical plasmas

Naohiro Kasuya, Makoto Sasaki, Satoshi Abe, Masatoshi Yagi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Plasma flows can be driven by turbulent stresses from excited modes in magnetized plasmas. Our recent numerical simulation of resistive drift wave turbulence in a linear device has shown that the radial inhomogeneity of the neutral density affects azimuthal flow generation by changing the phase structure of the most unstable eigenmodes. Eigenmode analyses show that the mode structure has a complex Bessel-type function shape in the central region of the plasma, and the imaginary part arises from the radial inhomogeneity of the damping term caused by ion-neutral collisions. The amplitude of turbulent stress is proportional to the inhomogeneity under a marginally stable condition. Global structural formation is an important factor for determining the plasma turbulent state, and this result clearly shows that several kinds of radial background distributions, the plasma and neutral densities in this case, can influence the global structures.

Original languageEnglish
Article number024501
Journaljournal of the physical society of japan
Volume87
Issue number2
DOIs
Publication statusPublished - Jan 1 2018

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cylindrical plasmas
inhomogeneity
damping
shape functions
magnetohydrodynamic flow
plasma density
turbulence
collisions
ions
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

On the radial eigenmode structure of drift wave instability with inhomogeneous damping in cylindrical plasmas. / Kasuya, Naohiro; Sasaki, Makoto; Abe, Satoshi; Yagi, Masatoshi.

In: journal of the physical society of japan, Vol. 87, No. 2, 024501, 01.01.2018.

Research output: Contribution to journalArticle

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