Speakers
Mr
Chunhui Zhang
(Utrecht University)Prof.
Thomas Peitzmann
(Utrecht University/Nikhef)
Description
A compact high-granularity electromagnetic calorimeter prototype has been built to perform generic R&D for an upgrade proposal of a forward calorimeter (FoCal) in the ALICE experiment, which should have very good gamma/π0 discrimination capabilities. The prototype is a Si/W sampling calorimeter using CMOS sensors of the MIMOSA type with a pixel pitch of 30 micron and binary readout with a total of ~39 million pixels. We will report on performance studies of the prototype with test beams at DESY and CERN in a broad energy range. The results of the measurements demonstrate a very small Moliere radius (~11mm) and good linearity of the response. Also results on the detailed shower shape, both longitudinal and lateral, will be presented. We will compare the measurements to GEANT-based MC simulations, which additionally include a modelling of charge diffusion. The studies show the extremely high potential of this technology for future calorimeter development.
Primary author
Mr
Chunhui Zhang
(Utrecht University)
Co-authors
Dr
Elena Rocco
(Utrecht University)
Dr
Gert-Jan Nooren
(Utrecht University)
Mr
Hongkai Wang
(Utrecht University)
Dr
Macro van Leeuwen
(Utrecht University)
Prof.
Thomas Peitzmann
(Utrecht University/Nikhef)
Mr
Ton van den Brink
(Utrecht University)
