【摘要】 BESⅢ-CsI(Tl)晶体量能器采用FADC的DAQ电子学读出系统．通过扫描信号幅度的分布寻找信号峰位．为了降低扫描时间窗内(3μs)的低能本底计数、提高能量分辨和降低无效计数率,除了传统的输出信号峰位(表征沉积能量)之外,我们引出另一个较粗的时间信息,即对应信号峰位的扫描步长数,其步长精度为50ns．本文将通过电子束流实验研究对这一时间信息的特点及如何利用时间信息进行详细的分析和讨论．更多还原

【Abstract】 The read out system of BESⅢ-CsI(Tl) calorimeter is based on FADC. The energy corresponds to the peak of signal waveform obtained by the scanning. In order to reduce the incoherent noise counts and improve the energy resolution a rough time information can also be fetched by counting the timing step number in FADC with a precision of 50ns besides the read out of energy information. The time information and the usage of this information in beam test are presented and discussed.更多还原