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The combination of finite-ion-Larmor-radius effects and surface stabilization by contact with a lateral wall or with a line-tied cold-plasma blanket can stabilize interchange modes at low plasma beta (beta=plasma pressure/magnetic pressure) in axisymmetric mirror devices. This is illustrated analytically in a simple one-dimensional radial model and numerically with a two-dimensional stability code for anisotropic mirror plasmas and parameters appropriate to the TRW symmetric tandem mirror experiment [Phys. Fluids 28, 1503 (1985)].
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Caponi et al. (1987) studied this question.
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