Speakers
Dr
Ugur Akgun
(University of Iowa)Prof.
Yasar Onel
(University of Iowa)
Description
Due to an expected increase in radiation damage in LHC, we propose to transform CMS Hadronic EndCap calorimeters to radiation hard quartz plate calorimeters. Quartz is proved to be radiation hard by the radiation damage tests with electron, proton, neutron and gamma beams. However, the light produced in quartz comes from Cerenkov process, which yields drastically fewer photons than scintillation. To increase the light collection efficiency we pursue two separate methods: First method; is to use wavelength shifting (WLS) fibers, which have been shown to collect efficiently the Cerenkov light generated in quartz plates. A quartz plate calorimeter prototype with WLS fibers has been constructed and tested at CERN to show that this method is feasible. Second proposed solution is to treat the quartz plates with radiation hard wavelength shifters, p-terphenyl, doped zinc oxide, or doped CdS. Another calorimeter prototype has been constructed with p-terphenyl deposited quartz plates, and showed superior calorimeter capabilities.
Here, the test beam, bench tests as well as the Geant4 simulation results of these calorimeter prototypes are reported. We also outline the future directions on these possible upgrade scenarios for the CMS HE calorimeter.
Author
Dr
Ugur Akgun
(University of Iowa)
Co-author
Prof.
Yasar Onel
(University of Iowa)
