摘要
根据带电粒子在薄层气隙中能量沉积的原理,用Landau函数拟合MRPC信号幅度谱比用高斯拟合可以给出更准确的幅度谱峰位,对所有pad的雪崩信号上限采用了统一的标准.通过研究pad的幅度谱峰位和雪崩信号比例与时间分辨的关系,给出了在测量时间有限的情况下MRPC的时间分辨要达到合格标准时MRPC雪崩信号幅度谱必须达到的指标.
According to the theory of energy deposition of charged particles in a thin gaseous medium,the Landau function is better than the Gauss function at fitting and to finding the peak of amplitude spectra of MRPC.A uniform standard was used to determine the upper limit of the avalanche signals on all pads.The relationships among the peak and the avalanche ratio of the amplitude spectrum and the time resolution of a big amount of pads was studied.The requirements for the amplitude spectrum were given to make sure that the time resolution meets the requirement when measurement time is limited.
基金
国家自然科学基金重大国际合作项目(10620120286)
中国科学院知识创新工程重要方向项目(KJCX2-YW-A14)
国家重点基础研究发展(973)计划(2008CB817707)资助
