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

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Název: Upgrade of Online Storage and Express-Reconstruction System for the Belle II Experiment
Autoři: Seokhee Park, Ryosuke Itoh, Diptaparna Biswas, Nils Braun, Markus Tobias Prim, Daniel Jacobi, Karim Trabelsi, Satoru Yamada, Soh Yamagata Suzuki, Mikihiko Nakao, Takuto Kunigo, Dmytro Levit
Přispěvatelé: HEP, INSPIRE
Zdroj: IEEE Transactions on Nuclear Science. 70:949-953
Informace o vydavateli: Institute of Electrical and Electronics Engineers (IEEE), 2023.
Rok vydání: 2023
Témata: Technology, ddc:600, physics-flagged events, accelerator, data acquisition, quality, monitoring, online-to-offline file transfer, Libraries, Servers, high energy physics instrumentation computing, BELLE, transport protocols, Belle II experiment, 7. Clean energy, Sockets, off-line, TCPIP, KEK-B, offline computing resource usage, semireal-time data quality monitoring, ring buffer, software-based high-level trigger system, transmission control protocol/internet protocol socket-based framework, online storage, online file size, physics-flagged data, data transfer, Internet, express-reconstruction system, high-energy physics, electron positron, Physics, Data acquisition, Detectors, ZeroMQ networking library, trigger, stability, HLT system, statistics, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], network, upgrade, electron-positron collisions, CPT, SuperKEKB accelerator, on-line, ROOT output file format
Popis: 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 (HLT) system and stored on online storage. After storing the data, the online storage sends the data to an express-reconstruction system for semireal-time data quality monitoring (DQM) and event display. The HLT system is built on the ZeroMQ networking library, but the online storage and express-reconstruction system are built on the ring buffer and transmission control protocol/internet protocol (TCP/IP) socket-based framework. To improve stability and future maintainability, we develop a 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 HLT results: for randomly sampled data and for physics-flagged data by the HLT system. The separate express-reconstruction system can process a larger number of statistics of physics-flagged events.
Druh dokumentu: Article
Conference object
ISSN: 1558-1578
0018-9499
DOI: 10.1109/tns.2023.3253517
Přístupová URL adresa: https://hal.science/hal-04174619v1
https://doi.org/10.1109/tns.2023.3253517
Rights: IEEE Copyright
Přístupové číslo: edsair.doi.dedup.....480bf3638b2b5de593f81bd9c4578d27
Databáze: OpenAIRE
Popis
Abstrakt: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 (HLT) system and stored on online storage. After storing the data, the online storage sends the data to an express-reconstruction system for semireal-time data quality monitoring (DQM) and event display. The HLT system is built on the ZeroMQ networking library, but the online storage and express-reconstruction system are built on the ring buffer and transmission control protocol/internet protocol (TCP/IP) socket-based framework. To improve stability and future maintainability, we develop a 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 HLT results: for randomly sampled data and for physics-flagged data by the HLT system. The separate express-reconstruction system can process a larger number of statistics of physics-flagged events.
ISSN:15581578
00189499
DOI:10.1109/tns.2023.3253517