Turbulence simulation taking account of inhomogeneity of neutral density in linear devices

Naohiro Kasuya, S. Abe, Makoto Sasaki, Inagaki Shigeru, T. Kobayashi, M. Yagi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

It is important to consider a combination of inhomogeneities, which drive and/or damp instabilities in magnetized plasmas. The inhomogeneity of neutral particle density is taken into account for analyzing turbulent states in linear devices by combining two kinds of simulations in this research. One is a simulation for 2D profiles of neutral particles and the other is that for resistive drift wave turbulence. Radial and axial profiles of neutral particles are calculated by the Monte Carlo method with a configuration of linear device PANTA. The ratio for ionization of neutral particles depends on the electron temperature, and the higher temperature in the operation range makes the neutral density smaller near the center of the plasma. Then, the radial profile of the ion-neutral collision frequency is set by introducing these neutral density profiles into resistive drift wave turbulence simulations. Smaller ion-neutral collision frequency makes the instabilities more unstable, and its inhomogeneity enhances mean electrostatic potential formation. The eigenmode structure is changed with the inhomogeneous ion-neutral collision frequency, and convective derivative nonlinearity generates the azimuthal flow near the center of the plasma. Two roles of the neutral particles on the turbulence, the direct change in linear instabilities and formation of background flows, become clear.

Original languageEnglish
Article number012314
JournalPhysics of Plasmas
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

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neutral particles
inhomogeneity
turbulence
profiles
simulation
collisions
ions
Monte Carlo method
nonlinearity
electron energy
electrostatics
ionization
configurations

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Turbulence simulation taking account of inhomogeneity of neutral density in linear devices. / Kasuya, Naohiro; Abe, S.; Sasaki, Makoto; Shigeru, Inagaki; Kobayashi, T.; Yagi, M.

In: Physics of Plasmas, Vol. 25, No. 1, 012314, 01.01.2018.

Research output: Contribution to journalArticle

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