Level-0 trigger algorithms for the ALICE PHOS detector
Level-0 trigger algorithms for the ALICE PHOS detector
复制标题
DOI：
10.1016/j.nima.2010.11.111
复制
发表时间：
2011-02
影响因子：
1.4
通讯作者：
Dong Wang;Lijiao Liu;Guangming Huang;J. Kral;H. Muller;D. Røhrich;K. Ullaland;Yaping Wang;Z. Yin;Fan Zhang;D. Zhou
中科院分区：
文献类型：
--
作者：
Dong Wang;Lijiao Liu;Guangming Huang;J. Kral;H. Muller;D. Røhrich;K. Ullaland;Yaping Wang;Z. Yin;Fan Zhang;D. Zhou
PHOS的0级触发为p-p碰撞提供了最小偏置触发，并为p-p和Pb-Pb碰撞提供了1级触发信息。考虑了两种0级触发生成算法：直接比较算法和加权和算法。为了通过仿真研究触发算法，从触发电子学中提取简化的等效模型，推导出作为触发算法输入的模拟或信号的波形函数。仿真结果表明，与直接比较算法相比，加权和算法可以获得更高的触发效率和更精确的单通道能量信息。在1GeV下，加权和算法的采样率为40Msps（百万样本每秒），能量分辨率可达9.75MeV。加权和算法在采样率为40Msps时的时序性能优于两种算法在采样率为20Msps时的时序性能。0级触发器可以在800ns内传递到ALICE CTP，时间不确定性为2个LHC束交叉周期。
The PHOS level-0 trigger provides a minimum bias trigger for p–p collisions and information for a level-1 trigger at both p–p and Pb–Pb collisions. There are two level-0 trigger generating algorithms under consideration: the Direct Comparison algorithm and the Weighted Sum algorithm. In order to study trigger algorithms via simulation, a simplified equivalent model is extracted from the trigger electronics to derive the waveform function of the Analog-or signal as input to the trigger algorithms. Simulations shown that the Weighted Sum algorithm can achieve higher trigger efficiency and provide more precise single channel energy information than the direct compare algorithm. An energy resolution of 9.75MeV can be achieved with the Weighted Sum algorithm at a sampling rate of 40Msps (mega samples per second) at 1GeV. The timing performance at a sampling rate of 40Msps with the Weighted Sum algorithm is better than that at a sampling rate of 20Msps with both algorithms. The level-0 trigger can be delivered to ALICE CTP within 800ns with a timing uncertainty of 2 LHC bunch crossing cycles.