1. R Frey ESTB20111 Silicon-Tungsten Electromagnetic Calorimeter R&D Collaboration M. Breidenbach, D. Freytag, N. Graf, R. Herbst, G. Haller, J. Jaros, T. Nelson SLAC National Accelerator Center J. Brau, R. Frey, D. Strom, P. Radloff (grad student), undergraduates U. Oregon B. Holbrook, R. Lander, M. Tripathi, M. Woods (grad student) UC Davis KPiX readout chip downstream readout mechanical design and integration detector development readout electronics cable development bump bonding

2. What underlies this R&D R&D for electromagnetic calorimetry for future lepton collider detectors  e.g. the SiD design for the ILC Design is meant to implement the particle flow algorithm for reconstructing jets  Requires finely segmented and dense ECal Pixellated silicon and tungsten layers  Imaging calorimtery Also good for reconstructing photons, electrons, tau final states, etc R Frey ESTB20112

3. Silicon-Tungsten R&D and test beam module R Frey ESTB20113 15 cm silicon sensors  13 mm2 pixels 1024-channel KPiX readout chip  Bump-bonded to sensor  One digital output  Large dynamic range  Power pulsing R&D project goal: Produce full- depth (30 layer) module which uses appropriate technologies for a collider detector (and test it). (expect it to be ready ~ summer)

4. Parameters required for Beam Tests Beam parametersValueComments Particle TypeElectron/positron Energy1 GeV to maximum Rep Rate~ 10 HzExpect to use SLAC RF for timing Charge per pulseLow: 0,1,2 particles/pulseMean < 1 Energy Spread2% or better Bunch length rmsNot important Beam spot size, x-yas small as reasonably possible Others (emittance, …)N/A LogisticsRequirements Space requirements (H x W x L) 20cm x 20cm x 15cm plus stand, etc Duration of Test and Shift Utilization 1-2 weeks; can do 24/7 shifts Desired Calendar Dates Depends on readiness; mid-July to mid-Aug or mid-Sept to late Sept look best at this time 4R Frey ESTB2011