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Qingquan Yu, Sizheng Zhu
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 459-462
Magnetohydrodynamic Equilibrium And Stability | doi.org/10.13182/FST95-A11947128
Articles are hosted by Taylor and Francis Online.
The growth of m/n=2/1 tearing mode is studied numerically in a new kind of equilibrium magnetic configuration: a zeroth-order axisymmetric equilibrium field superposed with a small m/n=7/4 static helical field, where m and n are respectively the poloidal and toroidal mode numbers. The amplitude of the magnetic flux perturbation |φ2/1| is found to be reduced as the magnitude of the m/n=7/4 helical field increases. |φ2/1| can be reduced to zero when the m/n=7/4 magnetic island is large enough that it overlaps the q=2 flux surface. Oscillatory |φ2/1| is also excited with appropriate the magnitude of the m/n=7/4 helical field. These results are of practical interest for tokamak reactor design.