SLHC Meeting - Frascati 24 Nov 2005 Fabrizio Palla INFN Pisa1
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)
SLHC Meeting - Frascati 24 Nov 2005 Fabrizio Palla INFN Pisa2
Pixel Systems 1-3 : Costs & Power .vs. eta (barrel/disks)
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
18000
0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
eta
Po
we
r [W
att
s]
Co
sts
[K
SF
r]Costs
Power
Pix Sys #1 : 3 layers 330 mW/cm2
High pix 400 SFr/cm2
Pix Sys #2 : 2 layers 130 mW/cm2
Large pix 100 SFr/cm2
Pix Sys #3 : 3 layers 45 mW/cm2
Macro pix 40 SFr/cm2
• Eta =1.4 Area = 18.3 m2
• Mechanics etc. not in costs!
• Strip detector ~25 mW/cm2
Cost & Power estimate for new Tracker
SLHC Meeting - Frascati 24 Nov 2005 Fabrizio Palla INFN Pisa3
Longer term R&D
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
SLHC Meeting - Frascati 24 Nov 2005 Fabrizio Palla INFN Pisa4
Strategy
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 ???