高时间分辨MRPC的位置灵敏读出方法

Spatial Resolution Measurement of a Position-Sensitive MRPC with High Time Resolution

根据MRPC工作机制和高时间分辨的特性,研制一种位置灵敏MRPC原型及读出方法．该探测器具有10个220μm气隙,有效探测面积为20cm×20cm．前端电子学采用专用ASIC芯片,具有快时间响应和输入电荷-输出信号宽度的转换功能．采取同时读取信号传输时间差和感应信号分布的方法实现两维读出．对该探测器性能的束流测试结果显示:沿着读出条方向及其垂直方向的位置分辨分别为 4．5mm和1．6mm,其时间分辨达到63ps,探测效率>95％．

A position-sensitive MRPC prototype with high time resolution was developed. This MRPC has 10×220μm gaps with the active area of 20cm×20cm. A front-end electronics based on NINO ASIC was used. The NINO ASIC can transform the input charge to the width of output signal for the Time-Over-Threshold （TOT） measurement by using High Performance TDC （HPTDC）. With the difference of transmit time and distribution of pins amplitude, we can get the two-dimension position information. The beam test result shows a spatial resolution of 4.5mm along the readout pads and 1.6mm perpendicular to the readout pads, respectively. The time resolution is about 63ps and the detection efficiency is over 95%.