Plasma and Fusion Research
Volume 5, S2051 (2010)
Regular Articles
- Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla 92093, USA
Abstract
We present a study of the role of zonal flows in relaxation and transport in a reduced model of collisionless ITG turbulence. A fundamentally new constituent in the relaxation dynamics is revealed, namely that ion and electron guiding center motion togather necessitate a radial flux of polarization charge, which in turn exerts a dynamical friction on phase space density evolution. This effect then enters the evolution of δf2 and the transport dynamics, as described by a Lenard-Balescu type equation. The underlying physics is similar to that which follows from conservation of potential vorticity, albeit now for a phase space fluid, and is not simple shearing or wave packet modulation. Consequences for zonal flow momentum balance are discussed.
Keywords
drift wave, zonal flow, granulation, polarization charge, collisionless dynamical friction, momentum theorem
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References
- [1] P. H. Diamond et al., Plasma Phys. Control. Fusion 47, R35 (2005).
- [2] K. Itoh et al., Phys. Plasmas 13, 055502 (2006).
- [3] Charnery et al., J. Geophys. Res. 66, 83 (1961).
- [4] G. K. Vallis, Atmospheric and Oceanic Fluid Dynamics (Cambridge University Press, Cambridge, 2006).
- [5] P. H. Diamond et al., Plasma Phys. Control. Fusion 50, 124018 (2008).
- [6] I. B. Bernstein et al., Phys. Rev. 108, 546 (1957).
- [7] T. H. Dupree, Phys. Fluids 15, 334 (1972).
- [8] T. H. Dupree, Phys. Fluids 25, 277 (1982).
- [9] H. L. Berk et al., Phys. Fluids 13, 980 (1970).
- [10] H. Biglari et al., Phys. Rev. Lett. 61, 1716 (1988).
- [11] H. Biglari et al., Phys. Fluids 31, 2644 (1988).
This paper may be cited as follows:
Yusuke KOSUGA and Patrick H. DIAMOND, Plasma Fusion Res. 5, S2051 (2010).