CMS Hadronic Endcap Calorimeter Upgrade Studies for SLHC "P-Terphenyl Deposited Quartz Plate Calorimeter Prototype"

WOS: 000276679200005The Large Hadron Collider (LHC) is going to start taking data with 10(33) cm(-2) s(-1) luminosity, and reach the designed value of 10(34) cm(-2) s(-1) in 2013. The LHC luminosity will continue to improve each year, reaching to 10(35) cm(-2) s(-1) in 2023. We call this high luminosity era the Super-LHC (SLHC). Hadronic Endcap (HE) calorimeters of the CMS experiment cover the pseudorapidity range of 1.4 < eta < 3 on both sides of the CMS detector, contributing to superior jet and missing transverse energy resolutions. As the integrated luminosity of the LHC increases, the scintillator tiles used in the CMS Hadronic Endcap calorimeter will lose their efficiency. The CMS collaboration plans to substitute Quartz plates for the scintillator tiles of the original design. Various tests have proved Quartz to be radiation hard, but the light produced by Quartz comes from Cerenkov process, which yields drastically fewer photons than scintillation. To increase the light collection efficiency, we propose to treat the Quartz plates with radiation hard wavelength shifters, p-terphenyl or 4% gallium doped zinc oxide. The test beam studies revealed a substantial light collection increase on pTp or ZnO:Ga deposited Quartz plates. We constructed a 20 layer calorimeter prototype with pTp coated plates, and tested the hadronic and the electromagnetic capabilities at the CERN H2 area. Here we report the results of these test beams as well as radiation damage studies performed on p-Terphenyl.U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-FG02-91ER-40664]; University of IowaManuscript received September 13, 2009; revised November 17, 2009. Current version published April 14, 2010. This work was supported by the U.S. Department of Energy (DE-FG02-91ER-40664).; The authors would like to thank CERN H2, and Fermilab Meson beam test, and Indiana University Cyclotron facilities. The authors especially would like to thank Eileen Hahn from Fermilab Thin Film laboratory for her amazing efforts on pTp, and ZnO:Ga depositions. The authors are indebted to our CMS HCAL Collaborators D. Green, J. Freeman, and A. Skuja for their support and encouragement, the QUARKNET students for their help during the construction of the prototypes. The authors would also like to thank the University of Iowa Office of Vice-President of Research, for its support