Using a novel diagnostic, cascades of high frequency modes have been observed in the core plasma of the ASDEX Upgrade tokamak. Their mode numbers obey the relation m0ex0ex=0ex0exn+1, with n up to 23. The appearance of cascades is always related to a region of low shear, which is ascribed to previous (m,n)0ex0ex=0ex0ex(1,1) mode activity and leads to the instability of tearing modes with high mode numbers. The destabilization and stabilization of modes resulting in the cascade process can be reproduced by a simple quasilinear model.
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Hallatschek et al. (1998) studied this question.
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