论文标题
J-PARC E16实验的Run-0a中的数据采集系统
Data acquisition system in Run-0a for the J-PARC E16 experiment
论文作者
论文摘要
J-PARC E16是一个实验，通过系统测量核中媒介媒介的光谱变化来检查强子质量的起源。 $ e^{+} e^{ - } $对向量介子衰减的测量将提供正常核密度中手性对称性的部分恢复的信息。为了解决脉搏堆积并从10 MHz的反应速率的背景中实现$ e^{\ pm} $的良好区分，数据采集（DAQ）系统使用APV25和DRS4的波形采样芯片。触发率和数据速率预计分别为1 kHz和130--330 MIB/S。开发了用于APV25和DRS4的DAQ系统，在该系统中，事件通过公共触发器和标签数据进行了同步。第一个名为Run-0a的Beam中的委托于2020年6月进行了大约1/4的设计设置。 DAQ在Run-0a中的触发速率为300 Hz，主瓶颈是APV25的大数据大小。 DAQ系统的进一步优化将改善性能。
J-PARC E16 is an experiment to examine the origin of hadron mass through a systematic measurement of spectral changes of vector mesons in nuclei. The measurement of $e^{+}e^{-}$ pairs from the decay of vector mesons will provide the information of the partial restoration of the chiral symmetry in a normal nuclear density. To resolve a pulse pile-up and achieve good discrimination of $e^{\pm}$ from the background of a reaction rate of an order of 10 MHz, the data acquisition (DAQ) system uses waveform sampling chips of APV25 and DRS4. The trigger rate and data rate are expected to be 1 kHz and 130--330 MiB/s, respectively. The DAQ system for readout of APV25 and DRS4 were developed, where events were synchronized by common trigger and tag data. The first commissioning in beam, called Run-0a, was performed in June 2020 with about 1/4 of the designed setup. The DAQ worked with a trigger rate of 300 Hz in the Run-0a and the main bottleneck was a large data size of APV25. Further optimization of the DAQ system will improve the performance.
