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Abstract
The Tile Calorimeter, covering the central region of theATLAS experiment up to pseudorapidities of ±1.7, is a sampling devicebuilt with scintillating tiles that alternate with iron plates. The light iscollected in wave-length shifting (WLS) fibers and is read out withphotomultipliers. In the characteristic geometry of this calorimeter thetiles lie in planes perpendicular to the beams, resulting in a very simpleand modular mechanical and optical layout. This paper focuses on theprocedures applied in the optical instrumentation of the calorimeter, whichinvolved the assembly of about 460,000 scintillator tiles and 550,000 WLSfibers. The outcome is a hadronic calorimeter that meets the ATLASperformance requirements, as shown in this paper.
Highlights
General features of the optical instrumentation and readoutThe layout of the readout cells in the Barrel and Extended Barrel calorimeters, together with the properties of the optical components used in equipping the modules, are crucial factors in determining the instrumentation procedures and the quality obtained
Source tubes of them bear directly on the specifications of the optical system and on the quality of the optical instrumentation: they are the photoelectron yield and the uniformity of the response from individual tiles and fibers within a readout cell
The LB modules were mechanically assembled at JINR (Dubna, Russia) and transported to CERN, where the optical instrumentation was performed with personnel contributed by several institutes
Summary
The layout of the readout cells in the Barrel and Extended Barrel calorimeters, together with the properties of the optical components used in equipping the modules, are crucial factors in determining the instrumentation procedures and the quality obtained.
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