【作者】 刘振安； 徐昊； 王大勇； 金大鹏； 富洪玉； 赵棣新； 过雅南；

【Author】 LIU Zhen’An;XU Hao;WANG Dayong;JIN Dapeng;FU Hongyu;ZHAO Dixin;GUO Yanan Inst. of High Energy physics, Beijing 100039

【机构】 北京中国科学院高能物理研究所；

【摘要】 本文介绍北京谱仪(BESⅢ)触发判选系统研制的模拟计算软件。通过该软件的模拟计算,为触发判选系统的设计提供依据,并检查整个系统是否满足物理实验对事例选择的要求。该软件可以根据给定的条件,自动产生漂移室(MDC)触发所需的径迹组合和飞行时间计数器(TOF)触发所需的击中组合及范围等数据。与硬件系统相对应,该软件由MDC触发、TOF触发、电磁量能器(EMC)触发、以及总触发(GLT)等部分组成。粒子在探测器中的响应数据经过触发模拟程序后,根据设定的条件,被标定为好事例或本底事例。该程序具有丰富的选项功能,以便对模拟效率等多项统计参数进行统计,图形功能可以直观的检查模拟过程的合理性和正确与否。该软件在BESⅢ触发系统的设计中得到应用,并在不断发展中。更多还原

【Abstract】 This paper describes a simulation software developed to provide baseline for the design ofBESⅢ trigger system. This program can be used to produce hit patterns for Track Segment Finding(TSF)and Track Finding(TF). Being fed with detector response data, it checks for and calculates number of a longand short tracks in Drift Chamber(MDC), calculates number of hits and looks for back to back hits in TOF,and also calculates the isolated clusters from continuous trigger cells formed by of 16 crystals and totalenergy and energy balance in Electromagnetic Calorimeter(EMC). Global Trigger(GLT) defines a triggertable of types with trigger conditions, and if a predefined type is satisfied a trigger output of L1 will beproduced for statistics. This software is proved working well in the preliminary design of BESⅢ triggersystem, and will be improved further.更多还原