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Opto Working Group Summary

Opto Working Group Summary. F. Vasey , T. Flick. Opto WG. WG meeting at TWEPP is the 2 nd of the year, after a first WG meeting in spring Topics of interest: Performance of the optical links in the various systems Plans for upgrades R&D projects

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Opto Working Group Summary

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  1. Opto Working GroupSummary F. Vasey, T. Flick

  2. Opto WG • WG meeting at TWEPP is the 2nd of the year, after a first WG meeting in spring • Topics of interest: • Performance of the optical links in the various systems • Plans for upgrades • R&D projects • This year some of these topics were to be addressed in the optoelectronics and poster sessions on Thursday, and were not repeated during the WG. • Opto session details: • https://indico.cern.ch/sessionDisplay.py?sessionId=19&confId=120853#20110928

  3. Agenda • Current and future systems • Environmental tests

  4. Agenda • Current and future systems • Environmental tests

  5. 1. LHCb Status As of Sept 2011, 1.8% of VCSELs died (and replaced) Silicon Tracker (IT+TT) most affected (2000 VCSELs) 1 – 2 deaths per month • Decision: Death rate is ‘acceptable’ • Regular repairs during technical stops – detectors are accessible • New batch of spares purchased from vendor • no further action planned Ken Wyllie, CERN

  6. LHCb Upgrade plans • Triggerlessreadout: zero-suppression at front-end • Use GBT + Versatile Link: ~ 11,000 data links + TTC/Slow-control Ken Wyllie, CERN

  7. 2. CMS Tracker Jan Troska, CERN

  8. CMS Tracker Jan Troska, CERN

  9. 3. CMS E-Cal Improvement A.Singovski University of Minnesota

  10. CMS E-Cal • Running very well, only some minor issues have been observed and are under study • Instability of some data and trigger links: loss of sync, timeout, etc. were fixed by decreasing GOH laser bias current • 14 cases in 2011 (some new) • Both EE and EB • Bias current down to 16-22 (default = 32) • More or less uniform over the year not directly linked to LHC luminosity • In two cases: EE-7, TT3 and EB-12, TT15 decrease of laser bias current was not sufficient. The problem in both cases was fixed by the additional attenuator A.Singovski University of Minnesota

  11. 4. present HCAL optolinks work very well For upgrade: Use GBT chipset and commercial receivers at off-detector side and… Eric Hazen, BU

  12. 5. Atlas Tony Weidberg, Oxford

  13. Agenda • Current and future systems • Environmental tests

  14. 1. Irradiation Tests by CERN VTx VRx Jan Troska, CERN

  15. 2. Links at low Temperatures • Goal is to develop an optical data link system for the LBNE LArTPC. • The challenge lies in the transmitting side in the LAr cryostat: • What about functionality and reliability  Testing • Tests done using liquid nitrogen is used (LN2, 77 K) instead of liquid argon (LAr, 89 K) due to the cost. TiankuanLiu, SMU

  16. Tests performed • Test of different parts: fibres, connectors, laser diodes, drivers, serializer, FPGAs, resistors, capacitors by using a LN2 bath. Power through fibres Temperature Curve FP Laser operation I/V and L/I Laser driver @ 77K Basically the components can work at low temperatures… … but there is still a long way and Systematic studies are required to address reliability issues TiankuanLiu, SMU

  17. Summary • Open reports about operational experience and progress • Running systems either experience minor or very severe problems. ATLAS SCT/Lar VCSEL problems seem to be under control. Thanks to very open reports, lessons are being shared. • Several systems have major upgrade plans: • Medium term: LHCb and CMS-HCAL • Opto WG @ TWEPP is good to touch base. The attendance was larger than in the past years. The time was short, but sufficient to allow some discussion. Together with the spring WG mini-workshop, it offers a good and regular forum for information exchange and discussion.

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