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 ???