Abstract
Existing theory of dynamic stabilization of MHD modes completely disagrees with experimental results obtained for the m=1 mode in a linear screw pinch with superimposed HF axial fields (Bz). Theory fails to describe the experimental stabilizing condition and the magnitude and structure of the dynamic force (Fexp) derived from it. There is some evidence that the discrepancy results from the fact that existing theory is linear in the sense that anharmonic coupling terms for different modes are neglected. Some arguments for a non-linearized treatment od dynamic stabilization of MHD modes are given. In the special case of dynamic stabilization of m=1 mode by Bz a model calculation shows that m=0 and m=1 mode coupling should be taken into account in the case omega s>> omega 1( omega s stabilizing frequency, omega 1 growth rate of the m=1 mode'. One anharmonic term in the m=1 equation of motion is approximately xi 0 xi 1, which agrees with the order of magnitude and the structure of Fexp.
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