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<b>Sheared-Flow Modes in Toroidal Geometry</b>

<p>J.L.V. Lewandowski, Z. Lin, W.W. Lee, and T.S. Hahm</p>

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<b>Date of PPPL Report:</b> October 1999
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<b>Accepted for publication in:</b> Physics of Plasmas</p>
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Using a Fourier-Bessel representation for the fluctuating (turbulent) electrostatic potential, an equation governing the sheared-flow modes in toroidal geometry is derived from the gyrokinetic Poisson equation, where both the adiabatic and non-adiabatic responses of the electrons are taken into account. It is shown that the principal geometrical effect on sheared-flow modes of the electrostatic potential is due to the flux-surface average of 1/<I>B</I>, where <I> B </I> is the magnetic field strength.

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