The Data Acquisition System of the KOTO Experiment and the RCE Platform Technology Upgrade

The KOTO experiment at J-PARC, Japan, aims to observe the rare neutral kaon decay mode K L → π 0 νν̅. After the first experimental run in May 2013 at a 24-kW beam power, the KOTO data acquisition (DAQ) system was upgraded in 2015 to provide efficient and reliable data collection at higher beam inten...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2017-06, Vol.64 (6), p.1338-1345
Main Authors: Su, Stephanie, Ameel, Jon, Beechert, Jacqueline, Campbell, Myron, Gee, Carolyn, Huff, Margaret, Micallef, Jessica, Robinson, Joshua, Rymph, Christopher, Schamis, Hanna, Taylor, Molly, Tecchio, Monica, Whallon, Nikola, Jia Xu, Sugiyama, Yasuyuki, Tajima, Yasuhisa, Bogdan, Mircea, Yau Wah
Format: Article
Language:English
Subjects:
Analog to digital conversion
Analog to digital converters
Clustering
Clusters
Compression
Compression algorithm
CP violation
Data acquisition
data acquisition (DAQ) system
Data acquisition systems
Data collection
Data compression
Data processing
Detectors
Engineering
event building
flash analog-to-digital converter (FADC)
Hardware
Infiniband
Lossless equipment
Mesons
Message passing
message passing interface (MPI) protocol
Modules
Neutrino sources
Nuclear Science & Technology
Packets (communication)
Photonics
Physics
RCE
reconfigurable clustering element (RCE) platform technology (RPT)
Technology
Upgrading
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Summary:The KOTO experiment at J-PARC, Japan, aims to observe the rare neutral kaon decay mode K L → π 0 νν̅. After the first experimental run in May 2013 at a 24-kW beam power, the KOTO data acquisition (DAQ) system was upgraded in 2015 to provide efficient and reliable data collection at higher beam intensities. Lossless data compression in the analog-to-digital converter modules was implemented to reduce the size of data packets, resulting in a threefold increase in data collection rate. A new software trigger on a 47-node cluster was designed to use Infiniband hardware with message passing interface protocol to establish a mesh network inside the computer clusters for parallel data processing. The upgrade to the KOTO DAQ system was commissioned in 2015 and successfully collected data with a beam intensity of up to 42 kW. In preparation for increasing beam intensities in future runs, the hardware trigger upgrades using the reconfigurable clustering element platform technology are under development.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2017.2694040