High precision phase difference calculation based on adaptive mixed-radix All-phase FFT for Tokamak plasma electron density measurement
Shuangbao Shu,
Jin Lai,
Yong Wang
et al.
Abstract:In many Tokamak devices, laser interferometers, such as HCN,
DCN, CO2, etc, are employed to measure the plasma electron density
by calculating the phase difference between the reference signal and
the detector signal. This paper proposes an adaptive All-phase fast
Fourier transform (Ap-FFT) method in the electronic density of the
plasma. And analyze the reasons why the multi-frequency measurement
phase is inaccurate. The proposed method can reduce the accuracy of
phase calculation by adjusting th… Show more
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