The ONSEN Data Reduction System for the Belle II Pixel Detector

	The ONSEN Data Reduction System for the Belle II Pixel Detector
	Gessler, T; Kuhn, W; Lange, JS; Liu, ZA; Munchow, D; Spruck, B; Zhao, JZ; Zhao JZ(赵京周)
刊名	IEEE TRANSACTIONS ON NUCLEAR SCIENCE
	2015
卷号	62 期号:3 页码:1149-1154
关键词	Data acquisition field programmable gate arrays high energy physics instrumentation computing
英文摘要	We present an FPGA-based online data reduction system for the pixel detector of the future Belle II experiment. The occupancy of the pixel detector is estimated at 3%. This corresponds to a data output rate of more than 20 GB/s after zero suppression, dominated by background. The Online Selection Nodes (ONSEN) system aims to reduce the background data by a factor of 30. It consists of 33 MicroTCA cards, each equipped with a Xilinx Virtex-5 FPGA and 4 GiB DDR2 RAM. These cards are hosted by 9 AdvancedTCA carrier boards. The ONSEN system buffers the entire output data from the pixel detector for up to 5 seconds. During this time, the Belle II high-level trigger PC farm performs an online event reconstruction, using data from the other Belle II subdetectors. It extrapolates reconstructed tracks to the layers of the pixel detector and defines regions of interest around the intercepts. Based on this information, the ONSEN system discards all pixels not inside a region of interest before sending the remaining hits to the event builder system. During a beam test with one layer of the pixel detector and four layers of the surrounding silicon strip detector, including a scaled-down version of the high-level trigger and data acquisition system, the pixel data reduction using regions of interest was exercised. We investigated the data produced in more than 20 million events and verified that the ONSEN system behaved correctly, forwarding all pixels inside regions of interest and discarding the rest.
学科主题	Engineering; Nuclear Science & Technology
类目[WOS]	Engineering, Electrical & Electronic ; Nuclear Science & Technology
收录类别	SCI ; EI
WOS记录号	WOS:000356458000042
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228419]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Gessler, T,Kuhn, W,Lange, JS,et al. The ONSEN Data Reduction System for the Belle II Pixel Detector[J]. IEEE TRANSACTIONS ON NUCLEAR SCIENCE,2015,62(3):1149-1154.
APA	Gessler, T.,Kuhn, W.,Lange, JS.,Liu, ZA.,Munchow, D.,...&赵京周.(2015).The ONSEN Data Reduction System for the Belle II Pixel Detector.IEEE TRANSACTIONS ON NUCLEAR SCIENCE,62(3),1149-1154.
MLA	Gessler, T,et al."The ONSEN Data Reduction System for the Belle II Pixel Detector".IEEE TRANSACTIONS ON NUCLEAR SCIENCE 62.3(2015):1149-1154.