Speaker
Dr
Francesca Nessi-Tedaldi
(ETH Zurich, Switzerland)
Description
An electromagnetic sampling calorimeter prototype has been developed to satisfy the requirements for running at the CERN Large Hadron Collider after the planned High-Luminosity upgrade (HL-LHC).
An innovative design, with wavelength-shifting (WLS) fibers running along the chamfers of each calorimeter cell, minimizes the mechanical complexity. The resistance to radiation has been optimised by minimizing the light path, by adopting Cerium Fluoride crystals as active medium and by aiming at Cerium-doped quartz for the WLS fibers, as its luminescence excitation wavelength matches well the CeF3 emission.
At the Beam Test Facility in Frascati, Italy, electrons with an energy of up to 491 MeV have allowed us to obtain first performance results on a prototype channel of 24 mm x 24 mm transversal cross section, using Kuraray WLS fibers. At the SPS-H4 beam line at CERN, electrons with energies of up to 150 GeV have then been used for an in-depth study of the energy resolution and of the impact-point dependence of response, and agreement is found with detailed GEANT4 simulations. A further beam test, where Cerium-doped quartz fibers have been adopted for wavelength-shifting, gives an energy resolution matching expectations. First tests of the timing performance, an aspect which is crucial for pileup mitigation at the HL-LHC, yield a resolution better than 100 ps using SiPMs, when the fast Cherenkov component from the fibers is exploited.
A matrix of 5 x 3 channels has been built and has been exposed to high-energy electrons from the CERN SPS to study the impact angle dependence of energy resolution and response up to ~15 deg. Its granularity and sampling fraction have been optimised for optimum pileup rejection. Transverse dimensions of 17 mm x 17 mm, 12 samplings of 6 mm Tungsten and 6 mm CeF3 for a total of 25 radiation lengths, and a readout using Avalanche Photodiodes have been adopted.
Primary author
Dr
Francesca Nessi-Tedaldi
(ETH Zurich, Switzerland)
Co-authors
Dr
Alessio Ghezzi
(Università di Milano Bicocca and INFN Milano, Italy)
Dr
Andrea Marini
(ETH Zurich, Switzerland)
Prof.
Anna Vedda
(Università di Milano Bicocca and INFN Milano)
Dr
Arabella Martelli
(Università di Milano Bicocca and INFN Milano, Italy)
Prof.
Botjo Betev
(ETH Zurich, Switzerland)
Dr
Chiara Rovelli
(INFN Sezione di Roma, Italy)
Mr
Christian Haller
(ETH Zurich, Switzerland)
Dr
Daniel Meister
(ETH Zurich, Switzerland)
Prof.
Daniele del Re
(Università la Sapienza and INFN - Roma, Italy)
Mr
Fabio Pellegrino
(INFN Sezione di Roma, Italy)
Mr
Federico Vazzoler
(Università degli Studi e INFN Trieste, Italy)
Dr
Francesca Cavallari
(INFN Sezione di Roma, Italy)
Dr
Francesco Micheli
(ETH Zurich, Switzerland)
Dr
Francesco Pandolfi
(ETH Zurich, Switzerland)
Dr
Francesco Santanastasio
(Università la Sapienza and INFN - Roma, Italy)
Prof.
Giovanni Organtini
(Università la Sapienza and INFN - Roma, Italy)
Dr
Giulia D'Imperio
(Università la Sapienza and INFN - Roma, Italy)
Prof.
Giuseppe Della Ricca
(Università degli Studi e INFN Trieste, Italy)
Prof.
Guenther Dissertori
(ETH Zurich, Switzerland)
Dr
Ioan Dafinei
(INFN Sezione di Roma, Italy)
Mr
James Faulkner
(Texas Tech University, USA)
Dr
Livia Soffi
(Università la Sapienza and INFN - Roma, Italy)
Dr
Lorenzo Bianchini
(ETH Zurich, Switzerland)
Mr
Lubomir Djambazov
(ETH Zurich, Switzerland)
Mr
Luca Brianza
(Università di Milano Bicocca and INFN Milano, Italy)
Prof.
Marcella Diemoz
(INFN Sezione di Roma, Italy)
Dr
Marco Peruzzi
(ETH Zurich, Switzerland)
Mr
Massimo Nuccetelli
(INFN Sezione di Roma, Italy)
Dr
Mauro Donegà
(ETH Zurich, Switzerland)
Dr
Mauro Fasoli
(Università di Milano Bicocca and INFN Milano, Italy)
Mr
Michael Droege
(ETH Zurich, Switzerland)
Mrs
Milena Quittnat
(ETH Zurich, Switzerland)
Mrs
Myriam Schoenenberger
(ETH Zurich, Switzerland)
Prof.
Nadia Pastrone
(INFN Torino, Italy)
Dr
Norberto Chiodini
(Università di Milano Bicocca and INFN Milano, Italy)
Prof.
Nural Akchurin
(Texas Tech University)
Dr
Paolo Meridiani
(INFN Sezione di Roma, Italy)
Mr
Pier Trapani
(INFN Torino, Italy)
Dr
Pietro Govoni
(Università di Milano Bicocca and INFN Milano, Italy)
Prof.
Rahatlou Shahram
(Università la Sapienza and INFN - Roma, Italy)
Dr
Riccardo Paramatti
(Università la Sapienza and INFN - Roma, Italy)
Mr
Robert Becker
(ETH Zurich, Switzerland)
Dr
Simone Gelli
(Università la Sapienza and INFN - Roma, Italy)
Mr
Simone Pigazzini
(Università di Milano Bicocca and INFN Milano, Italy)
Mr
Thomas Klijnsma
(ETH Zurich, Switzerland)
Prof.
Tommaso Tabarelli de Fatis
(Università di Milano Bicocca and INFN Milano, Italy)
Mr
Urs Horisberger
(ETH Zurich, Switzerland)
Mrs
Valeria Monti
(INFN Torino, Italy)
Mr
Vieri Candelise
(Università degli Studi e INFN Trieste, Italy)
Dr
Werner Lustermann
(ETH Zurich, Switzerland)
