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Bandwidth Estimation for SLHC Readout Units: Challenges and Current Research Insights

This document discusses bandwidth estimation for readout units, specifically in the context of the SLHC. It defines a readout unit and outlines key assumptions regarding detector granularity, occupancy, and average L1 trigger rates. The presentation highlights the current limitations of opto-electronic readout systems, particularly in radiation environments, and raises pertinent questions regarding device durability against fluence. Current activities include characterizing newly acquired VCSELs and plans for testing radiation resistance of various components. Future proposals aim to secure resources and collaboration for effective testing and design evaluation.

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Bandwidth Estimation for SLHC Readout Units: Challenges and Current Research Insights

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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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