The StrECAL

• An important goal of Phase-I is to study the pion & muon production beam line’s performance so we can learn from this as we continue to Phase-II

• large uncertainties in
• low-momentum pion production in the backwards direction
• particle interactions that cause backgrounds

• The Straw Tracker + ECAL combination will measure particle fluxes at the 90-degree point

• to be fed back into beam line models and Geant4 simulations

• Also important to use Phase-I as a test bed for Phase-II detectors

• similar detector technologies used to help make design decisions