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Basic starting point

Basic starting point. New tracker layers on the timescale of the first 5 years of running are a sensible first step Contained in the volume from pixel layer 0 to 4 Need to use/reuse service space for pixels Questions for R&D Single layers or a complete replacement?

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Basic starting point

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  1. Basic starting point • New tracker layers on the timescale of the first 5 years of running are a sensible first step • Contained in the volume from pixel layer 0 to 4 • Need to use/reuse service space for pixels • Questions for R&D • Single layers or a complete replacement? • New sensor geometry and/or technology? • Small strips? • What features in the electronics to make first steps towards using these layers in L1? • Seeding vs correlation • Be on the road maps at the right levels and at timescales • To assist, already agreed CMS peer-review scheme • Main lines identified so far • Tracker & Trigger • Microelectronics and Power • Optoelectronics & data architectures • Merge at early stage into system(s) Fabrizio Palla INFN Pisa

  2. Cost & Power estimate for new Tracker • Pix Sys #1 : 3 layers • 330 mW/cm2 • High f pix400 SFr/cm2 • Pix Sys #2 : 2 layers • 130 mW/cm2 • Large pix100 SFr/cm2 • Pix Sys #3 : 3 layers • 45 mW/cm2 • Macro pix40 SFr/cm2 • Eta =1.4  Area = 18.3 m2 • Mechanics etc. not in costs! • Strip detector~25 mW/cm2 Fabrizio Palla INFN Pisa

  3. Power requires major effort & new ideas Chip voltages reduce with technology evolution, currents may (??), but number of channels will not Need to bring increased total currents through volumes which can’t expand Material budget should not increase R&D and qualification time is underestimated Reduce the number of module types Increase automation of assembly Large systems are hard to build Qualification must be taken seriously True industrial production is likely to be required Sensors are one of many issues Any new material technology must be large-scale commercial within ~5 years Electronic technology evolution will bring benefits and also more complexity and much difficult work Longer term R&D Fabrizio Palla INFN Pisa

  4. Is the right strategy R&D followed by request for complete new tracker? Alternative could be upgrade… ..by installation of modest protoype system at tp = to + 5y Less cost and lower risk Less substantial case for support needed More chance of resources, on short time scale Allows trial of components or devices, which may still evolve Technology investigations less popular with funding agencies than physics experiments Human time-scale Might be possible to react to LHC conditions, either machine, experiment or even discoveries or to convince reviewers & funders… May be complete pixel system replacement ??? Strategy Fabrizio Palla INFN Pisa

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