Reduction effect of neutral density on the excitation of turbulent drift waves in a linear magnetized plasma with flow

Y. Saitou, A. Yonesu, S. Shinohara, M. V. Ignatenko, N. Kasuya, M. Kawaguchi, K. Terasaka, T. Nishijima, Y. Nagashima, Y. Kawai, M. Yagi, S. I. Itoh, M. Azumi, K. Itoh

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Abstract

The importance of reducing the neutral density to reach strong drift wave turbulence is clarified from the results of the extended magnetohydrodynamics and Monte Carlo simulations in a linear magnetized plasma. An upper bound of the neutral density relating to the ion-neutral collision frequency for the excitation of drift wave instability is shown, and the necessary flow velocity to excite this instability is also estimated from the neutral distributions. Measurements of the Mach number and the electron density distributions using Mach probe in the large mirror device (LMD) of Kyushu University [S. Shinohara, Plasma Phys. Control. Fusion 37, 1015 (1995)] are reported as well. The obtained results show a controllability of the neutral density and provide the basis for neutral density reduction and a possibility to excite strong drift wave turbulence in the LMD.

Original languageEnglish
Article number072301
JournalPhysics of Plasmas
Volume14
Issue number7
DOIs
Publication statusPublished - Aug 7 2007

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Saitou, Y., Yonesu, A., Shinohara, S., Ignatenko, M. V., Kasuya, N., Kawaguchi, M., Terasaka, K., Nishijima, T., Nagashima, Y., Kawai, Y., Yagi, M., Itoh, S. I., Azumi, M., & Itoh, K. (2007). Reduction effect of neutral density on the excitation of turbulent drift waves in a linear magnetized plasma with flow. Physics of Plasmas, 14(7), [072301]. https://doi.org/10.1063/1.2743030