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DHCAL Prototype Construction



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DHCAL Prototype Construction Jos Repond Argonne National Laboratory Linear Collider Workshop Stanford University March 18 22 2005 Digital Hadron Calorimeter Fact Particle Flow Algorithms improve energy resolution compared to calorimeter measurement alone Assumption Confusion term is the dominant contribution to jet energy resolution Particles in jets Fraction of energy Measured with Resolution 2 Charged 65 Tracker Negligible Photons 25 ECAL with 15 E 0 072 Ejet Neutral Hadrons 10 ECAL HCAL with 50 E 0 162 Ejet Confusion Minimize confusion term High segmentation Technical implementation Required for 30 E 18 E 0 242 Ejet Maximize segmentation of calorimeter readout 1 bit resolution on readout preserves energy resolution for hadrons Resistive Plate Chambers RPCs Gas Electron Multipliers GEMs DHCAL R D Goal Prototype section 1 m3 to contain most of hadronic showers 40 layers with 20 mm steel plates as absorber Lateral readout segmentation 1 cm2 Longitudinal readout segmentation layer by layer Gas Electron Multipliers GEMs and Resistive Plate Chambers RPCs evaluated Motivation for construction and beam tests Validate RPC approach technique and physics Validate concept of the electronic readout Measure hadronic showers with unprecedented resolution Validate MC simulation of hadronic showers Compare with results from Analog HCAL Comparison of hadron shower simulation codes by G Mavromanolakis Why different active media Scintillator GEMs RPCs Technology Proven SiPM Relatively new Relatively old Electronic readout Analog multi bit or Semi digital few bit Digital single bit Digital single bit Thickness total 8mm 8 mm 8 mm Segmentation 3 x 3 cm2 1 x 1 cm2 1 x 1 cm2 Pad multiplicity for MIPs Small cross talk Measured at 1 27 Measured at 1 6 Sensitivity to neutrons low energy Yes Negligible Negligible Recharging time Fast Fast Slow 20 ms cm2 Reliability Proven Sensitive Proven glass Calibration Challenge Depends on efficiency Not a concern high efficiency Assembly Labor



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