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A combination of scintillator, wavelength shifting (WLS) fiber, and siliconphotomultiplier (SiPM) shows excellent performance in the `$K_{L}$ and $\mu$detector (KLM)' of the Belle II experiment. We describe the R&D for a similardetection technology with a new scintillator and SiPM, which can be implementedfor a muon detector for the proposed CEPC experiment and the upgrade of KLM inBelle II. The R&D contains the study of the performance of a new scintillatorwith a length of 150 cm, the NDL SiPM with a sensitive surface of 3 mm $\times$3 mm or the Hamamatsu MPPC with a sensitive surface of 1.3 mm $\times$ 1.3 mm,the construction of a detector strip, and the methods to achieve excellentlight collection. The cosmic ray tests show good photon collections by NDL SiPMor MPPC, efficiencies well above 90% with a threshold of 8 p.e., and timeresolutions of better than 1.7 ns for the hits at the far end of a scintillatorstrip. The performance shows a good option for an excellent muon detector forCEPC and the possible upgrade of Belle II KLM.

Design and test for muon detectors based on extruded scintillator and SiPM