基于硅光电倍增管对塑料闪烁光纤衰减长度及光产额的研究

Measurement of Attenuation Length and Light Yield of Plastic Scintillating Fiber with Silicon Photomultiplier

  • 摘要: 作为外靶实验终端(ETF)飞行时间探测的关键探测器,起始时间探测器需满足承受高计数率、高时间分辨和位置分辨等需求。塑料闪烁光纤(PSF)作为起始时间探测器改进方案的一种考虑,其衰减长度、光产额等性能参数将直接影响探测器的实际性能。本工作基于硅光电倍增管(SiPM)和PSF搭建相应的测试平台,系统研究了SiPM SensL MicroFC-SMA-30035和PSF Kuraray SCSF-78J的实际性能。结果表明:所选型号的SiPM具有优秀的单光子分辨能力,在所选工作电压范围内具有高增益及良好的增益线性,且具有较好的线性响应;光子在光纤中的衰减由两种成分组成,芯层光的有效衰减长度为547.4 cm,包层光的有效衰减长度为15.5 cm,光纤有效光产额约为552光子/mm,实际光产额约为968光子/mm。测试结果表明,采用该PSF结合SiPM读出的方式满足新型起始时间探测器的要求。

     

    Abstract: As a key detector for high accurate time-of-flight measurement at the external target facility (ETF), the start-time detector is required to have high count rate, high time resolution, and position resolution and so on. Plastic scintillating fiber (PSF) is regarded as an ideal option for the improved scheme, and its performance parameters such as attenuation length and light yield will directly affect the final performance of the detector. In this paper, a test platform based on PSF and silicon photomultiplier (SiPM) was built, and the performance of SiPM SensL MicroFC-SMA-30035 and PSF Kuraray SCSF-78J was studied systematically. The measurement results show that the selected SiPM has excellent single photon detection ability, high gain and good gain linearity within the operation voltage range, and it has good linear response to incident photon. The attenuation length was also investigated. The core layer of the fiber has an effective attenuation length of 547.4 cm, while the cladding layer of the fiber has a shorter-value of 15.5 cm. The effective light yield of the selected PSF is about 552 photon/mm, and the actual value is about 968 photon/mm. The test results show that the selected PSF coupled with SiPM for readout meets the requirements of a new start-time detector.

     

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