Upgrade of Online Storage and Express-Reconstruction System for the Belle II Experiment

The Belle II experiment started to take data of electron-positron collisions provided by the SuperKEKB accelerator, with all subdetectors from March 2019. The collected data are selected by a software-based high-level trigger system and stored on online storage. After storing the data, the online st...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2023-06, Vol.70 (6), p.1-1
Main Authors: Park, Seokhee, Itoh, Ryosuke, Biswas, Diptaparna, Braun, Nils, Prim, Markus Tobias, Jacobi, Daniel, Trabelsi, Karim, Yamada, Satoru, Suzuki, Soh Yamagata, Nakao, Mikihiko, Kunigo, Takuto, Levit, Dmytro
Format: Article
Language:English
Subjects:
Compression
Data acquisition
Data collection
data transfer
Detectors
high-energy physics
Internet
IP (Internet Protocol)
Libraries
Maintainability
Physics
Reconstruction
Servers
Sockets
Storage
TCP (protocol)
TCP/IP (protocol)
TCPIP
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Summary:The Belle II experiment started to take data of electron-positron collisions provided by the SuperKEKB accelerator, with all subdetectors from March 2019. The collected data are selected by a software-based high-level trigger system and stored on online storage. After storing the data, the online storage sends the data to an express-reconstruction system for semi-real-time data quality monitoring and event display. The high-level trigger system is built on the ZeroMQ networking library, but the online storage and express-reconstruction system are built on the ring buffer and TCP/IP socket-based framework. To improve the stability and future maintainability, we develop the new online storage and express-reconstruction system using the ZeroMQ library. The new systems have a few additional improvements. First, the online storage supports the ROOT output file format with compression. This reduces the online file size, necessary network bandwidth for the online-to-offline file transfer, and offline computing resource usage. Second, two types of express-reconstruction systems are prepared based on the high-level trigger results; for randomly sampled data and for physics-flagged data by the high-level trigger system. The separate express-reconstruction system can process a larger number of statistics of physics-flagged events.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2023.3253517