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PRC – CALICE Progress Report

PRC – CALICE Progress Report. Paul Dauncey, Imperial College London Representing the CALICE Collaboration. CALICE overview. CALICE is studying LC ECAL and HCAL as an integrated system Technical feasibility of detectors Simulation verification of prototype with real data

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PRC – CALICE Progress Report

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  1. PRC – CALICE Progress Report Paul Dauncey, Imperial College London Representing the CALICE Collaboration Paul Dauncey - CALICE/PRC

  2. CALICE overview CALICE is studying LC ECAL and HCAL as an integrated system • Technical feasibility of detectors • Simulation verification of prototype with real data • LC physics performance studies for jet energy reconstruction CALICE continues to attract new collaborators • Currently 138 physicists, 24 institutes, 8 countries, all regions New collaborators allow the project scope to increase too • Silicon-Tungsten ECAL • Tile HCAL; scintillating tiles with analogue readout • Fine-grained HCAL with digital readout; several options • RPCs, GEMs, small scintillating tiles Aim to have information for LC calorimetry TDR by mid 2006 • Driven by possible LC decision in 2005 Paul Dauncey - CALICE/PRC

  3. ECAL mechanics and silicon progress Silicon wafer (Prague) design; 66 diodes/wafer. 29 good wafers (out of 30) so far. Careful design of inter-pad regions needed to minimise dead space. First carbon fibre mechanical structure (France) and insert for prototype. Tungsten plates have thickness and density within tolerance; carbon fibre structure show good mechanical behaviour. 1.0 mm Paul Dauncey - CALICE/PRC

  4. ECAL electronics Very front end chip (Orsay) with 18 channels, CR-RC shaper and multiplexer. Prototype back from fabrication Sept; currently under test. PCB to hold chips and silicon wafers under design, production in 2003. Custom-builtVME readout board (UK); may also be used for HCAL readout. Aim for 1kHz peak rate. Under design, with first prototype mid 2003. Paul Dauncey - CALICE/PRC

  5. Tile HCAL tile-fibre developments Detailed study done of many combinations of scintillating tile, wavelength-shifting fibres and their mechanical coupling (DESY, Russia, Prague); detailed write-up available from V.Korbel. • Example of tile-fibre geometry dependence; varies from ~9 to ~25 p.e./MIP Paul Dauncey - CALICE/PRC

  6. Tile HCAL photodiodes and electronics Similarly detailed investigation of available photodetectors with 55 cm2 scintillator tiles. MIP peaks clearly separated from pedestals. • All tested in beam with satisfactory performance • None yet usable in high field • Several will be used in prototype to gain operation experience MEPHI, Si-PM, 11 mm2 pixel Hamamatsu, multianode PM, 55 mm2 pixel Hamamatsu,APD, 55 mm2 Hamamatsu,APD-array,11 mm2 pixel Paul Dauncey - CALICE/PRC

  7. Digital HCAL options Three digital HCAL options now being actively considered: • RPCs (Russia, Korea, US) • Scintillating tiles (US) • GEMs (US) Latter two possible due to new groups joining collaboration • More US groups asking to join these efforts in future Front-end electronics developments (France/Korea) • Simple Q-V “conditioner” circuit feeding FPGA directly • Could be used for any/all options Back-end electronics may be common to ECAL/HCAL • Reusing ECAL readout boards (UK) • Leads to common DAQ system Paul Dauncey - CALICE/PRC

  8. Digital HCAL: RPCs A lot of HEP experience; cheap easy to use, flexible pad size/shape. Glass resistive plates, anode pads outside gas gap; gives superior performance with e ~ 98% First custom RPC plane early 2003, prototype mid 2004 Clear signals seen in both avalanche and streamer mode Paul Dauncey - CALICE/PRC

  9. Digital HCAL: scintillating tiles Small scintillating tiles with wavelength-shifting fibre (NICADD) Hexagonal pad 2 cm/side; spray paint (not wrap) external surface for reflectivity Sigma groove also being studied • Ten layer module in 2003 • Prototype by late 2004 or 2005 Good MIP separation seen Paul Dauncey - CALICE/PRC

  10. Digital HCAL: GEMs GEM development (UTA); using GEM foils from CERN GEM foil (CERN) micrograph; hole size 75mm Prototype 1010 pad array. Each pad 11 cm2. Aim to install several layers in prototype in 2005. Paul Dauncey - CALICE/PRC

  11. Software simulation comparisons Need to verify simulation before optimising calorimeter design; significant disagreements between GEANT3/4, particularly p/n (UK) Before beam test data: • Compare GEANT3, GEANT4, Fluka • Determine most sensitive variables to vary in beam Using beam test data: • Tune simulation parameters to optimise description • Determine best simulation to use Paul Dauncey - CALICE/PRC

  12. Software reconstruction and EFLOW REPLIC; reconstruction program for calorimeters using full reconstruction (France) Charged pads Good reconstruction of number of photons/event Photons multiplicity/event FANAL photons Example of clean separation with narrow showers in silicon-tungsten; realistic EFA tests now feasible. Paul Dauncey - CALICE/PRC

  13. Beam test preparations Beam test with both ECAL and HCAL Test all HCAL options • Same Fe plates and mechanical structure Data taking in 2004/5 • O(102) configurations (HCAL  beam energies  particle types  preshower  incident angle …) • O(106) events per configuration • O(1TByte) of data total Paul Dauncey - CALICE/PRC

  14. Summary • Great amount of progress in many areas: • New collaborators: broadened scope of project • ECAL: mechanical and electrical, all on schedule • Tile HCAL: large optimisation program nearing completion • Digital HCAL: new options starting up, sharing common mechanics for beam test prototype installation • Software: simulation comparisons in place and mature reconstruction package available • Beam test is an essential part of the CALICE work • Technology feasibility, operational experience, simulation verification; all needed to verify basic calorimetry concept • We invite the PRC to recognise the importance of this part of the program Paul Dauncey - CALICE/PRC

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