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The m / n = 2/1 neoclassical tearing modes are first observed in HL-2A low density, low beta plasma with central electron cyclotron resonance heating. The neoclassical tearing modes (NTMs) are triggered by a sawtooth crash with m / n = 1/1 precursors, which are toroidal coupled with a small scale m / n = 2/1 mode. The time history of the island width is compared with the prediction of the NTM theory, showing a good agreement between theory and experiment.
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Xiao-Quan et al. (2010) studied this question.
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