Data Flow and High Level Trigger of Belle II DAQ System
Data Flow and High Level Trigger of Belle II DAQ System
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DOI：
10.1109/tns.2013.2273091
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
R. Itoh;T. Higuchi;M. Nakao;S. Suzuki;S. Lee
中科院分区：
文献类型：
--
作者：
R. Itoh;T. Higuchi;M. Nakao;S. Suzuki;S. Lee
贝儿二号实验是在升级后的加速器SuperKEKB上进行的新一代B工厂实验。加速器的亮度预计将比以前的KEKB高40倍以上，平均1级触发速率估计将达到30 kHz，总原始数据大小约为1.1 Mbytes，导致数据吞吐量≥ 30 Gbytes/sec。为了管理这一巨大的数据流，贝儿II DAQ系统设计为使用大量CPU执行多步数据简化，这些CPU在从探测器读出模块到高级触发器场的各种DAQ组件中实现。本文介绍了贝儿II数据采集系统中高级触发器场的数据流设计和体系结构。
The Belle II experiment is a new generation B-factory experiment at the upgraded accelerator SuperKEKB. The luminosity of the accelerator is expected to be more than 40 times higher than that of the previous KEKB, and the average Level 1 trigger rate is estimated to become up to 30 kHz with a total raw data size of ~ 1.1 Mbytes resulting in a data throughput of ≥ 30 Gbytes/sec. In order to manage this huge data flow, the Belle II DAQ system is designed to perform a multi-step data reduction using a large number of CPUs implemented in various DAQ components from the detector readout modules to the High Level Trigger farm. In this article, the design of the data flow and the architecture of the High Level Trigger farm in the Belle II DAQ system is reported.