【摘要】 利用BC408塑料闪烁体直接耦合R2490-05高抗磁光电倍增管，组成双层飞行时间探测器．通过2GeV的π-束流测量，结果表明其本征时间分辨（标准偏差）≤50ps．利用该探测单元组成的飞行时间探测器系统，以其时间性能、结构、技术成熟和价格的优势，可以应用到τ-c工厂的带电粒子鉴别系统上．更多还原

【Abstract】 We have studied the performance of a doublelayer TOF unit, which is made of two BC408 scintillators coupled direchy with high antimagnetic R2490-05 PMTs. The experimental results using a 2GeV π- beam show that its time resolution is less than 50ps. With the good bine resolution, simple construction, mature technique and low price, the TOF detector composed of the unit studied herein is capable to be applied in the PID system in the τ-c factory.更多还原