First results of the silicon telescope using an 'artificial retina' for fast track finding

Conference · Wed Jul 01 04:00:00 EDT 2015

DOI:https://doi.org/10.1109/ANIMMA.2015.7465644· OSTI ID:22531420

Neri, N. ^[1]; Abba, A.; Caponio, F.; Geraci, A.; Grizzuti, M.; Lusardi, N. ^[2]; Citterio, M.; Coelli, S.; Fu, J.; Monti, M.; Petruzzo, M. ^[3]; Bedeschi, F.; Ninci, D.; Piucci, A.; Spinella, F.; Walsh, J. ^[4]; Cenci, R.; Marino, P.; Morello, M. J.; Stracka, S. ^[5] ; Punzi, G. ^[6]; Tonelli, D. ^[7]; Ristori, L. ^[4]

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1. Istituto Nazionale di Fisica Nucleare - INFN, Sezione di Milano, Milano (Italy)
2. INFN Milano and Politecnico di Milano, Milano (Italy)
3. INFN Milano, Milano (Italy)
4. INFN Pisa, Pisa (Italy)
5. INFN Pisa and Scuola Normale Superiore di Pisa, Pisa (Italy)
6. INFN Pisa and Universita di Pisa, Pisa (Italy)
7. CERN, Geneva (Switzerland)

We present the first results of the prototype of a silicon tracker with trigger capabilities based on a novel approach for fast track finding. The working principle of the 'artificial retina' is inspired by the processing of visual images by the brain and it is based on extensive parallelization of data distribution and pattern recognition. The algorithm has been implemented in commercial FPGAs in three main logic modules: a switch for the routing of the detector hits, a pool of engines for the digital processing of the hits, and a block for the calculation of the track parameters. The architecture is fully pipelined and allows the reconstruction of real-time tracks with a latency less then 100 clock cycles, corresponding to 0.25 microsecond at 400 MHz clock. The silicon telescope consists of 8 layers of single-sided silicon strip detectors with 512 strips each. The detector size is about 10 cm x 10 cm and the strip pitch is 183 μm. The detectors are read out by the Beetle chip, a custom ASICs developed for LHCb, which provides the measurement of the hit position and pulse height of 128 channels. The 'artificial retina' algorithm has been implemented on custom data acquisition boards based on FPGAs Xilinx Kintex 7 lx160. The parameters of the tracks detected are finally transferred to host PC via USB 3.0. The boards manage the read-out ASICs and the sampling of the analog channels. The read-out is performed at 40 MHz on 4 channels for each ASIC that corresponds to a decoding of the telescope information at 1.1 MHz. We report on the first results of the fast tracking device and compare with simulations. (authors)

• Research Organization: Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
• OSTI ID: 22531420
• Report Number(s): ANIMMA--2015-IO-381
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
COMPARATIVE EVALUATIONS
DATA ACQUISITION
IMAGE PROCESSING
IMAGES
LAYERS
MHZ RANGE
PARTICLE TRACKS
PATTERN RECOGNITION
READOUT SYSTEMS
SAMPLING
SI SEMICONDUCTOR DETECTORS
SWITCHES
TELESCOPE COUNTERS