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Addressing VCSEL Failures in ATLAS: Meeting Summary - August 2010

This meeting focused on the persistent failures of VCSELs (Vertical-Cavity Surface-Emitting Lasers) used in the ATLAS experiment at CERN, with implications for sub-systems such as Pixel/SCT, Lar, and RPC. Information was shared regarding these failures and ongoing analyses across different systems, including LHCb reports. The goal was to develop coordinated actions to understand and resolve these issues. The agenda covered various topics including the use of on-detector and off-detector VCSELs, transmission methods, and collaboration efforts in Taiwan.

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Addressing VCSEL Failures in ATLAS: Meeting Summary - August 2010

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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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