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ATLAS VCSEL based links

ATLAS VCSEL based links. Ph. Farthouat, CERN. Purpose of this meeting. We are (have been) experiencing VCSELs failures in ATLAS Pixel/SCT, Lar , RPC LHCb is also reporting some failures This meeting is an attempt to: Give a complete picture of the use of VCSELs in ATLAS

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ATLAS VCSEL based links

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  1. ATLAS VCSEL based links Ph. Farthouat, CERN

  2. Purpose of this meeting ATLAS VCSEL based links – August 2010 • We are (have been) experiencing VCSELs failures in ATLAS • Pixel/SCT, Lar, RPC • LHCb is also reporting some failures • This meeting is an attempt to: • Give a complete picture of the use of VCSELs in ATLAS • Share information about failures in different sub-systems and the on-going analysis • Prepare coordinated actions/work in view of understanding and solving the problems

  3. VCSELs in ATLAS ATLAS VCSEL based links – August 2010

  4. Remarks ATLAS VCSEL based links – August 2010 • On-detector VCSELs of SCT and Pixel send light only when there are transmitting data • “on time” is a function of trigger rate and occupancy • All other VCSELs are on half of the time • TTC transmission (SCT/Pixel off detect.) • Gbit links using 8b10b (or similar) encoding for all the others • Detailed reports this afternoon for those failing and the on-detector SCT and Pixel

  5. Agenda ATLAS VCSEL based links – August 2010 Introduction and VCSELs in ATLAS VCSELsin LHCb VCSELs in the RPC VCSELs in the Lar On-detector SCT VCSELs Off-detector SCT/Pixel VCSELs On-detector Pixel VCSELs On-going analysis for the on-detector Pixel VCSELs Work in Taiwan and interactions with True-Light Discussion

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