The trigger system for the MEG II experiment

The trigger system for the MEG II experiment
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MEG II 实验的触发系统

DOI:
10.1016/j.nima.2022.167736
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发表时间:
2023
期刊:
NIM A
影响因子:
--
通讯作者:
Marco Francesconi et. al.
Marco Francesconi et. al.
中科院分区:
--
文献类型:
--
作者:
小野雅弥;鴻巣明日香;菊地泰生;小野雅弥;小野雅弥・吉賀豊司;Marco Francesconi et. al.

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为了将μ→ e γ衰变的电流灵敏度提高一个数量级,Paul Scherrer Institute的MEG II实验于2021年完成了整合阶段,所有探测器在随后的束流时间内成功运行。2021年早些时候,为实验读数而开发的WaveDAQ集成触发和数据采集(TDAQ)系统已完全投入使用。MEG II TDAQ系统接收来自探测器的近9000个通道,是迄今为止最大的WaveDAQ部署,证明了整体设计的可扩展性,从台式设置到各种较小规模的实验。我们将描述MEG II触发系统如何利用在线水平的信号事件特性,将实验目标处的1007 μ子衰变降低到10 Hz事件率。触发系统执行光子簇射的量热重建,然后在600 ns的硬延迟时间内将时间和方向与正电子候选者进行比较。2021年部署的线上重建首次发布,实现了2. 4%的光子能量分辨率在信号能量为52。子粒子间符合时间分辨率为0.8MeV,符合时间分辨率为0.2ns。
Intending to improve the current sensitivity on μ→ e γ decay by one order of magnitude, the MEG II experiment at Paul Scherrer Institute completed the integration phase in 2021 with all detectors successfully operated throughout the subsequent beamtime. Earlier in 2021, the WaveDAQ integrated Trigger and Data Acquisition (TDAQ) system, developed for the readout of the experiment, was completely commissioned. Receiving almost 9000 channels from the detectors, the MEG II TDAQ system is the largest WaveDAQ deployment so far, proving the scalability of the overall design, from bench-top setup through various smaller-size experiments. We will describe how MEG II trigger system reduces the∼ 1 0 7 muon decays at the experiment target down to a 10 Hz event rate by exploiting the signal event characteristics at the online level. The trigger system performs the calorimetric reconstruction of the photon shower and then compares the timing and direction with positron candidates within a 600 ns hard latency time. The first release of the online reconstruction, deployed in 2021, achieved a 2. 4% photon energy resolution at the signal energy of 52. 8 MeV and a∼ 2 ns coincidence time resolution among the child particles.
使用MEG II实验液氙伽马射线探测器时间校准计数器评估时间分辨率
DOI: --
发表时间: 2022
期刊:
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DOI: --
发表时间: 2022
期刊:
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