Aug 4 – 8, 2015
America/Detroit timezone

Real Time Tracker Based Upon Local Hit Correlation Circuit for Silicon Strip Sensors

Aug 6, 2015, 5:00 PM
Koessler (Michigan League)


Michigan League


Niklaus Lehmann (Lawrence Berkeley National Lab. (US))


ATLAS is a general purpose experiment at the LHC at CERN. For the planned high luminosity upgrade of the LHC, a significant performance improvement of the ATLAS detector is required, including a new tracker and a new trigger system that makes use of charged track information early on. The current ATLAS baseline is to seed the lowest trigger level with calorimeter and muon information only, but exploration of real time track correlation as will be presented in this talk is nevertheless of interest, as the upgraded trigger design has not yet been finalized. For this, a new readout scheme in parallel with conventional readout, called the Fast Cluster Finder (FCF), was included in the latest prototype of the ATLAS strip detector readout chip, the ABC130. The FCF is capable of finding hits within 6 ns and transmitting the found hit information synchronously every 25 ns. Using the FCF together with external correlation logic makes it possible to look for pairs of hits consistent with tracks from the interaction point above a transverse momentum threshold. A correlator logic finds correlations between two closely spaced parallel sensors, a "doublet", and can generate information used as input to a lowest level trigger decision. Such a correlator logic was developed as part of a demonstrator and was successfully tested in an electron beam. The results of this test beam experiment proved the concept of the real time track vector processor with FCF.
Oral or Poster Presentation Oral

Primary author

Niklaus Lehmann (Lawrence Berkeley National Lab. (US))


Carl Haber (Lawrence Berkeley National Lab. (US)) Haichen Wang (Lawrence Berkeley National Lab. (US)) Lorenzo Pirrami (University of Applied Science Western Switzerland (CH)) Mauricio Garcia-Sciveres (Lawrence Berkeley National Lab. (US)) Sergio Diez Cornell (Deutsches Elektronen-Synchrotron (DESY))

Presentation materials