The ONSEN Data Reduction System for the Belle II Pixel Detector

Geßler, Thomas; Kühn, W.; Lange, J. S.; Liu, Zhenan; Münchow, D.; Spruck, B.; Zhao, J.

doi:10.1109/tns.2015.2414713

Cited by 23 publications

(18 citation statements)

References 11 publications

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“…The data from 5 half ladders are multiplexed on-line by the FPGA-based sub-event builder, Data Handling Concentrator (DHC). The sub-events are distributed to the Online Selection Nodes (ON-SEN) [13]. The FPGA-based ONSEN system performs on-line data reduction based on the tracks reconstructed in the outer detectors.…”

Section: Data Read-out and Data Reductionmentioning

confidence: 99%

DEPFET Pixel Detector for Belle II

Levit¹

2016

Proceedings of 54th International Winter Meeting on Nuclear Physics — PoS(BORMIO2016)

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The Belle II detector is a general-purpose spectrometer which is being built at the asymmetric electron-positron collider SuperKEKB in Japan. The experiment aims at more precise measurement of the Standard Model contribution and overconstraining of the unitarity triangle in the B and D meson decays. The 2-layer active pixel detector based on the novel DEPFET technology is the innermost detector in the experiment and a part of the vertex detector which consists of pixel detector and double-sided silicon strip detector. The pixel detector provides excellent spacial resolution of around 10 µm and low material budget resulting in 0.21% X 0 /layer. The detector is used to measure the precise position of the primary decay vertex. The energy loss in the detector may also be used for the identification of the incident particles.

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Section: Data Read-out and Data Reductionmentioning

confidence: 99%

DEPFET Pixel Detector for Belle II

Levit¹

2016

Proceedings of 54th International Winter Meeting on Nuclear Physics — PoS(BORMIO2016)

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“…The digitized data of the PXD are collected by Data Handling Hybrid (DHH) and DHH Concentrator (DHHC) modules [7] and forwarded to ATCA-based modules called as ONline SElector Node (ONSEN) [8]. Inside the ONSEN system, data 0018-9499 © 2015 IEEE.…”

Section: Belle II Daq Systemmentioning

confidence: 99%

Data Acquisition System for the Belle II Experiment

Yamada

Itoh

Nakamura

et al. 2015

IEEE Trans. Nucl. Sci.

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The Belle II experiment, a new generation B-factory experiment at KEK to search for new physics beyond the standard model, is scheduled to start in 2017. The maximum trigger rate is expected to reach as high as 20 kHz with the raw event size of more than 1 MB and we set the designed trigger rate to 30 kHz for the data acquisition (DAQ) system. This requirement for the data acquisition is a big challenge. The Belle II DAQ system is a synchronous system based on a pipelined trigger flow control. Data from all subdetectors except for the Pixel Detector (PXD) digitized by the front-end are transferred to unified readout modules (COPPER) via a high speed optical link (Belle2link). The data are then collected by the readout PCs via Ethernet and the event building is performed in multiple steps. The built events are fed into High Level Trigger (HLT) to perform a software trigger. For processing data of the PXD, an FPGA-based readout system (ONSEN) is used. ONSEN performs a data reduction by exploiting expected hit positions of charged tracks reconstructed by the HLT. In order to test the full functionality of our DAQ design, we developed a down-scaled version of the Belle II DAQ system. The system was used in the combined beam test of Silicon Vertex Detector (SVD) and PXD in the DESY test beam performed in January of 2014. A slow control and real time data monitoring system were also implemented in this test. All components of this complex readout chain successfully cooperated to collect the beam data.Index Terms-Belle II, data acquisition.

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“…Upon occurence of a low-level trigger signal, all subdetectors besides the pixel detector are read out, events are built and fed to the high-level trigger. Simultaneously, the pixel-detector data is read out and stored on a buffer node [10]. The high-level trigger performs a full reconstruction of the event excluding pixel data.…”

Section: The Belle II Detectormentioning

confidence: 99%

Vertexing and Tracking SW at Belle II

Schlüter¹

2015

Proceedings of the 23rd International Workshop on Vertex Detectors — PoS(Vertex2014)

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Belle II is a B factory experiment aiming to start physics data taking in 2017. It is currently being set up at the SuperKEKB accelerator at the KEK facility in Tsukuba (Japan), an asymmetric e + e − collider which aims to achieve an unprecedented instantaneous luminosity of 8 • 10 35 Hz/cm 2. This forty-fold increase over predecessor experiments is achieved by employing a novel nanobeam scheme. Originally developed for the now-defunct SuperB experiment, this scheme allows a significant increase in luminosity at only modest increases of beam currents. Challenges for the vertex detector result from increased data and background rates. At full luminosity, physics data will be recorded at a rate of 30 kHz. The radiation-hard DEPFET-sensors of the innermost layer of the vertex detector will be read out employing a novel data-reduction scheme using selective detector read out based on online reconstruction of event data. Belle II uses a software framework in which data handling is unified between various data processing modules. In this way, tasks can be divided flexibly and the same software framework can be used for a diversity of tasks ranging from the high-level trigger to final processing of plots for publications. Tracking and vertexing modules are currently under development and we will discuss their features.

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The ONSEN Data Reduction System for the Belle II Pixel Detector

Cited by 23 publications

References 11 publications

DEPFET Pixel Detector for Belle II

DEPFET Pixel Detector for Belle II

Data Acquisition System for the Belle II Experiment

Vertexing and Tracking SW at Belle II

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