Data acquisition system of the DEPFET detector for the Belle II experiment

Dmytro Levit, Igor Konorov, Boris Zhuravlev, Stephan Paul, Thomas Gessler, Soren Lange, David Munchow, Bjorn Spruck, Wolfgang Kuhn, Jingzhou Zhao, Zhen'An Liu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The upgrade of the Belle experiment and the KEKB accelerator aims to increase the experimental data set of the experiment by the factor 50. This will be achieved by increasing the luminosity of the accelerator which requires also a significant detector upgrade. A new pixel detector based on the DEPFET 1 technology is one of the detector upgrade requirements to handle the increased reaction rate and provide better vertex resolution. One of the features of the DEPFET detector is a long integration time of 20 μs. With the expected detector occupancy of about 2%, the detector will generate about 22 GB/s of data. A custom two-level read-out system consisting of Data Handling Hybrid and Online Selection Node is built to control the detector, process data and eventually reduce amount of data by one factor of magnitude. The DHH system synchronizes all detector modules to an external clock, provided by the clock and trigger distribution system of the experiment. It performs initial data processing that includes pixel remapping, sub-event building and cluster reconstruction. Then the data are further processed in the Online Selection Node and reduced by accepting only those hits which are associated to regions of interest pointed by other tracking detectors with better time resolution. The functionality, architecture and current state of the Belle II pixel detector readout system are discussed.

Original languageEnglish
Title of host publication2013 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479905348
DOIs
StatePublished - 2013
Externally publishedYes
Event2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013 - Seoul, Korea, Republic of
Duration: 27 Oct 20132 Nov 2013

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Conference

Conference2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
Country/TerritoryKorea, Republic of
CitySeoul
Period27/10/132/11/13

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