R&D FOR HIGHLY GRANULAR CALORIMETERS

Roman Pöschl on behalf of the CALICE Collaboration

- Need excellent jet energy resolution to separate e.g. W and Z boson in their hadronic decays- 3%/Ejet-4%/Ejet which is two times better than at LEP or SLC- Physics goals at future lepton collider requires highly granular calorimeters

W, Z separation in the ILD concept

Large R&D program of CALICE Collaboration

Hadron showers in great detail

Motivation – Precision physics at future lepton colliders

Different stages of a hadron shower

Counting track segments

Particle separation4D reconstruction – Time structure of hadron showers

Unravelling the origin of electroweak symmetry breaking

Analysis of beam test data and simulation studies

Electromagnetic calorimeters

Tungsten as absorberSilicon or scintillator as active medium0.18x.0.18x0.2 m3 of detection volume equipped with up to 10000 cells

Different technologies under one roof

Hadron calorimeters

Steel or tungsten as absorberScintillator as active medium orGlass RPCs a active mediumRPCs allow for realisation of detectionvolume with ~480000 calorimetric cells in 1m3 World record!!!!

- Construction of prototypes- Technological challenges - SiPM, power pulsed electronics- (Combined) beam tests with prototypes since 2004 at CERN, DESY and Fermilab

Primary particleSecondaries

1st Interaction2nd Interaction