1. 6 Mar 2002Readout electronics1 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. 6 Mar 2002Readout electronics2 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. 6 Mar 2002Readout electronics3 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. 6 Mar 2002Readout electronics4 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. 6 Mar 2002Readout electronics5 Beam test will be large effort UK hoped to piggy-back some extra longer-term R&D 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 R&D scope of the readout

6. 6 Mar 2002Readout electronics6 UK bid Very basic readout system for 10k channels –Nothing to do with TESLA R&D –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. 6 Mar 2002Readout electronics7 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