The Belle II Pixel Detector Data Acquisition and Reduction System

	The Belle II Pixel Detector Data Acquisition and Reduction System
	Spruck, B; Gessler, T; Kuhn, W; Lange, JS; Lin, HC; Liu, ZA; Munchow, D; Xu, H; Zhao, JZ;林海川; Liu ZA(刘振安)
刊名	IEEE TRANSACTIONS ON NUCLEAR SCIENCE
	2013
卷号	60 期号:5 页码:3709-3713
关键词	Data acquisition field programmable gate arrays high energy physics instrumentation computing
英文摘要	The upcoming Belle II experiment is designed to work at a luminosity of 8 x 10(35) cm(-2) s(-1), 40 times higher than its predecessor. The pixel detector of Belle II with its similar to 8 million channels will deliver ten times more data than all other sub-detectors together. A data rate of 22 Gbytes/s is expected for a trigger rate of 30 kHz and an estimated pixel detector occupancy of 3%, which is by far exceeding the specifications of the Belle II event builder system. Therefore a realtime data reduction of a factor >30 is needed. A hardware platform capable of processing this amount of data is the ATCA based Compute Node (CN). Each CN consists of an xTCA carrier board and four AMC/xTCA daughter boards. The carrier board supplies the high bandwidth connectivity to the other CNs via Rocket-IO links. In the current prototype design, each AMC board is equipped with a Xilinx Virtex-5 FX70T FPGA, 4 GB of memory, Gbit Ethernet and two bi-directional optical links allowing for a bandwidth of up to 12.5 Gbits/s. IPMI control of mother and daughter board is foreseen. One ATCA shelf containing 10 mother boards/40 daughter boards is sufficient to process the data from the 40 front end boards. The data reduction on the CN is done in two steps. First, the event data delivered by the front end electronics via optical links is stored in memory until the high level trigger (HLT) decision has been made. The HLT rejects >2/3 of these events. In a second step, pixel data of positively triggered events is reduced with the help of regions of interest (ROI), calculated by the HLT from projecting trajectories back to the pixel detector plane. The design allows additional ROI inputs computed from hit cluster properties or tracklets from the surrounding silicon strip detector. The final data reduction is achieved by sending only data within these ROIs to the main event builder.
学科主题	Engineering; Nuclear Science & Technology
收录类别	SCI
WOS记录号	WOS:000325827700044
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224239]
专题	高能物理研究所_实验物理中心
推荐引用方式 GB/T 7714	Spruck, B,Gessler, T,Kuhn, W,et al. The Belle II Pixel Detector Data Acquisition and Reduction System[J]. IEEE TRANSACTIONS ON NUCLEAR SCIENCE,2013,60(5):3709-3713.
APA	Spruck, B.,Gessler, T.,Kuhn, W.,Lange, JS.,Lin, HC.,...&赵京周.(2013).The Belle II Pixel Detector Data Acquisition and Reduction System.IEEE TRANSACTIONS ON NUCLEAR SCIENCE,60(5),3709-3713.
MLA	Spruck, B,et al."The Belle II Pixel Detector Data Acquisition and Reduction System".IEEE TRANSACTIONS ON NUCLEAR SCIENCE 60.5(2013):3709-3713.