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In the discharge of EAST tokamak,it is observed that(2,1) neoclassical tearing mode(NTM) is triggered by mode coupling with a(1,1) internal mode.Using singular value decomposition(SVD) method for soft X-ray emission and for electron cyclotron emission(ECE),the coupling spatial structures and coupling process between these two modes are analyzed in detail.The results of SVD for ECE reveal that the phase difference between these two modes equals to zero.This is consistent with the perfect coupling condition.Finally,performing statistical analysis of γ_(1/1),ζ_(1/1) and ω_(2/1),we find that γ_(1/1) more accurately represents the coupling strength than ζ_(1/1),and γ_(1/1) is also strongly related to the(2,1) NTM triggering,where γ_(1/1) is the width of(1,1) internal mode,ζ_(1/1) is the perturbed amplitude of(1,1) internal mode,and ω_(2/1) denotes the magnetic island width of(2,1) NTM.
In the discharge of EAST tokamak, it is observed that (2,1) neoclassical tearing mode (NTM) is triggered by mode coupling with a (1,1) internal mode. Using singular value decomposition (SVD) method for soft X-ray emission and for electron cyclotron emission (ECE), the coupling spatial structures and coupling process between these two modes are analyzed in detail. The results of SVD for ECE reveal that the phase difference between these two modes equals to zero. This is consistent with the perfect coupling condition .Finally, performing statistical analysis of γ_ (1/1), ζ_ (1/1) and ω_ (2/1), we find that γ_ (1/1) more accurately represents the coupling strength than ζ_ (1) (1/1) is the width of (1,1) internal mode, ζ_ (1/1) is the inverse of (1, 1) is the perturbed amplitude of (1,1) internal mode, and ω - (2/1) denotes the magnetic island width of (2,1) NTM.