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Precise measurement of betatron tune is required for good operating conditionof CSNS RCS. The fractional part of betatron tune is important and it can bemeasured by analyzing the signals of beam position from the appointed BPM.Usually these signals are contaminated during the acquisition process,therefore several power spectrum methods are used to improve the frequencyresolution. In this article classical and modern power spectrum methods areused. In order to compare their performance, the results of simulation data andIQT data from J-PARC RCS are discussed. It is shown that modern power spectrumestimation has better performance than the classical ones, though thecalculation is more complex.

Classical and modern power spectrum estimation for tune measurement in CSNS RCS