Abstract
A cylindrical plasma model is discussed in the low magnetic shear limit where FLR effects are relevant. Two regimes of the drift frequency are found. When FLR effects are large, they dominate finite-beta phenomena, producing cut-off of the main tearing mode independent of plasma pressure gradient. With small FLR, a smooth transition to the zero Larmor radius approximation is discussed. In both regimes, overstable modes with small growth rate and frequency characterized by the ion drift frequency are found, but the theory is less reliable in these cases.
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