R&D FOR HIGHLY GRANULAR CALORIMETERS

1. R&D FOR HIGHLY GRANULAR CALORIMETERS Roman Pöschlon behalf of the CALICE Collaboration Motivation – Precisionphysicsat future lepton colliders W, Z separation in the ILD concept Unravelling the origin of electroweaksymmetrybreaking - Need excellent jet energy resolution to separate e.g. W and Z boson in their hadronic decays - 3%/Ejet-4%/Ejetwhich is two times better than at LEP or SLC - Physics goals at future lepton collider requires highly granular calorimeters Large R&D program of CALICE Collaboration Different technologies under one roof • Construction of prototypes • Technological challenges • SiPM, power pulsedelectronics • - (Combined) beam tests with prototypes • since 2004 at CERN, DESY and Fermilab Hadron calorimeters Steel or tungsten as absorber Scintillator as active medium or Glass RPCs a active medium RPCsallow for realisation of detection volume with ~480000 calorimetriccells in 1m3 World record!!!! Electromagneticcalorimeters Tungsten as absorber Silicon or scintillator as active medium 0.18x.0.18x0.2 m3 of detection volume equippedwithup to 10000 cells Analysis of beam test data and simulation studies Hadron showers in greatdetail Different stages of a hadron shower Countingtrack segments Secondaries Primaryparticle 2nd Interaction 1st Interaction 4D reconstruction – Time structure of hadron showers Particleseparation