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Opto-Electronics

Opto-Electronics. Cigdem Issever, Todd Huffman, Tony Weidberg 12.04.2005 UK-SLHC Meeting. Bandwidth Estimation for SLHC. Define a ‘readout unit’ like a stave. Assumptions: The granularity of the detector increases by a factor of 6. Occupancy increases by a factor of 10/6 = 1.66.

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Opto-Electronics

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  1. Opto-Electronics Cigdem Issever, Todd Huffman, Tony Weidberg 12.04.2005 UK-SLHC Meeting B. T. Huffman, University of Oxford

  2. Bandwidth Estimation for SLHC • Define a ‘readout unit’ like a stave. • Assumptions: • The granularity of the detector increases by a factor of 6. • Occupancy increases by a factor of 10/6 = 1.66. • The average L1 trigger rate is 100 kHz. • Reading out 6 upper (or lower) Modules: 3.4 (binary) – 4.6 (digital) GBits/sec with a safety factor of 2 • Current ID opto-electronic readout system can go up to 1.6 GBits/sec B. T. Huffman, University of Oxford

  3. Radiation Environment after 2500 fb-1 ~ 2.5 years SLHC Readout devices for strips must resist n x 1015cm-2 Current opto-electronic readout system was tested up to ~2 x 1014 cm-2. Fred Hartjes B. T. Huffman, University of Oxford

  4. Open Questions • How much fluence can the current devices tolerate: • Driver Chip and Phase-Locked-Loop-IC (GOL, QPLL used by LHCb) • VCSELs • Pin Diodes • What is the SEU cross section @ GBits/sec? • If current devices fail, • need to explore COTS or radiation hard devices. • OR place devices at radii where they can be operated. • Readout systems @ 2-3 GBits/sec? Gain from other group’s R&D efforts. B. T. Huffman, University of Oxford

  5. Current Activities & Short Term Plans • Received six pixel VCSELs from Taiwan  started to characterise them • Automating these measurements • Received Centronic pin diodes + Test Kit from B’ham  working • Plan to irradiate VCSELs & diodes up to O(10^15) protons cm-2 • Use n reactor at Ljubljana • How much are the devices activated? • Answers Wednesday. • Non-biased: irradiate, anneal,.. • Biased test will follow. • Planning SEU test board (GOL, VCSELs, QPLL, PIN) for GBits/sec operation of devices while irradiation • Collaboration with SMU (ATLAS LAr) B. T. Huffman, University of Oxford

  6. Current Activities & Short Term Plans • Fibre’s that are currently used for ATLAS will be irradiated up to 100MRad by Taiwan group. B. T. Huffman, University of Oxford

  7. Proposals in the works • EURYI proposal passed national hurdle • Would provide resources for most all tests and equipment ~3 years. • Manpower as well. • Writing a seed-corn proposal • 3 – years, similar resources as EUYI • Working with other UK groups • Complimentary projects • Other groups involved in sensors, Rad. Simulation etc. • At moment considering only testing/evaluation of new designs • Want to work closely with Design groups, have input, influence, obtain instruction on operation. • Cable design (optical and electrical) B. T. Huffman, University of Oxford

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