NIFS-014

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Author(s): K. Urata, T. Hatori and T. Amano Title: Current Bubble Formation by Nonlinear Coupling of Resisitive Tearing Modes Date of publication: Feb. 1990 Key words: tearing mode, mode coupling, chaotic magnetic field, and clump Abstract: The current bubble means a helical duct with low current density invading the inner high current region of current carrying toroidal plasmas. It is a non-turbulent analogue of the MHD clump. The numerical simulations show that it appears right after the absorption of a small magnetic island into the chaotic layer in the separatrix region of a large magnetic island.

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