CALICE: Status report

1
CALICE Status report

• Paul Dauncey, Imperial College
• for Birmingham, Cambridge Manchester, UCL

• Outline
• CALICE and the ECAL
• Aims of CALICE beam test
• UK involvement
• Schedule

2
CALICE Collaboration

• Around 150 people from 7 countries 15 UK
• Spokesman - Jean-Claude Brient
• Steering Board Chair - Rolf-Dieter Heuer
• Both ECAL and HCAL groups involved
• UK involved in SiW ECAL side two strands
• Technical prototype single layer mechanical
  structure, TESLA TDR design. No UK involvement.
• Physics prototype 30 layer beam test module,
  10k channels, not TESLA mechanical structure. UK
  will bid to do the readout for this. Beam test in
  2003/4.

3
Issues for SiW ECAL

• Silicon-Tungsten ECAL is expensive
• Mainly cost of many layers of silicon wafers
• Must be justified by energy flow argument
• Says good spatial resolution is needed to
  understand hadronic jet structure and so optimise
  jet resolution.
• Verification of this will take a lot of work
• Reconstruction algorithms, etc. (Neural nets?)
• Need accurate simulation of hadronic showers
• Studies also needed to optimise design
• Compromise between resolution and cost

4
Aims of CALICE beam test

• The major aim of the beam test is
• Verify/tune hadronic simulation
• Thought to require substantial work
• Other aims are
• Verify/tune electromagnetic simulation
• Probably in much better agreement
• Investigate performance of calorimeters
• Number of layers, cell resolution, etc.
• Cross check against simulation studies

5
Beam test will be large effort

• UK hoped to piggy-back some extra longer-term RD
  on top of major aims
• UK groups interested in readout electronics
• Initial ideas for TESLA-like readout
  untriggered bunch train structure, data reduction
  on-detector, etc.
• BUT
• Fast pre-amp chip (not a UK responsibility) will
  not be developed in time available
• No TESLA-like version in time for beam test
• Have to reduce the RD scope of the readout

6
UK bid

• Very basic readout system for 10k channels
• Nothing to do with TESLA RD
• May include HCAL readout as service to CALICE
• Simpler system so easier schedule
• Significantly cheaper in equipment and TD effort!
• Concentrate more on major aim of beam test
• Freed-up UK effort available for reconstruction
  algorithm development and ECAL optimisation
• Critical issue to justify ECAL expense in a few
  years UK better placed to have influence

7
Schedule

• Beam test scheduled for late 2003 or early 2004
• Location as yet undecided DESY? Fermilab??
  Russia???
• CERN financial situation another complicating
  factor
• UK proposal to PPRP for May meeting
• Assume open presentation at that time
• May take two meetings before final approval
• Leaves 18 months to build system
• We thing this is sufficient given simplicity of
  reduced design