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Estimation of Radiation Effects in the Front-End Electronics of an ILC Electromagnetic Calorimeter

Estimation of Radiation Effects in the Front-End Electronics of an ILC Electromagnetic Calorimeter. V. Bartsch , M. Postranecky, M. Warren, M. Wing University College London. Geometry. magnet. ECAL, 30 slabs stacked on top each other, in z direction 25 slabs next to each other

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Estimation of Radiation Effects in the Front-End Electronics of an ILC Electromagnetic Calorimeter

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  1. Estimation of Radiation Effects in the Front-End Electronics of an ILC Electromagnetic Calorimeter V. Bartsch, M. Postranecky, M. Warren, M. Wing University College London

  2. Geometry magnet ECAL, 30 slabs stacked on top each other, in z direction 25 slabs next to each other extends to |eta|=1.1 HCAL very frontend electronics (VFE) based on ASICs frontend electronics (FE) based on FPGAs, 1 FPGA/slab

  3. Single Event Upsets (SEUs) critical energy ( depend on angle and entry point of the incident particle and its energy at each point of the volume) sensitive volume (can be guessed by irradiating with different ions with a different linear energy transfer, plus guessing the dephts of the device => Weibull fit which gives the cross sectional area of the sensitive region per node) • look for particles which deposit much charge in small area • p, p, n

  4. Physics processes • other physics processes like ttbar, WW and Bhabhar scattering also studied but small in terms of SEUs • pair production as another machine background studied but focussed on the very forward region

  5. Event generation • device simulation in both cases done with MOKKA using the TESLA geometry model

  6. energy spectrum at the FPGAs • only n, p, p deposit enough energy for SEUs • not every event causes a SEU

  7. some FPGAs’ SEU cross sections • cross sections for SEU to occur vary for each FPGA • values can be found in literature • SEU rate in ECAL FPGAs small, but needs to be considered in choice of FPGA D. Gingrich et al., IEEE Transactions on Nuclear Science, Vol. 50, No. 2, 2003

  8. additional studies • studies are based on the generated MC samples for the SEU study, for the further studies all generated particles have been used • occupancy for the barrel ECAL: 0.002 • needs to be considered in the DAQ for the ECAL combined with occupancy resulting from noise • ECAL radiation damage studies: • expected fluence: 2x106 (1 MeV n eq.)/(cm2*year) • expected radiation: 0.13 Rad/year • fluence and radiation dose small enough not to cause damage to the FPGAs

  9. conclusion • gg machine background and QCD physics background main contributor to protons, pions and neutrons crossing the ECAL • Single Event Upset rate small for the ECAL FPGAs at the Linear Collider • needs to be considered though for the final choice of the FPGA type

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