CERN Accelerating science

Thesis
Report number	CERN-THESIS-2008-253
Title	ATLAS calorimetry: Trigger, simulation and jet calibration
Related title	ATLAS calorimetry: Trigger, simulation and jet calibration.
Author(s)	Weber, Pavel (Kirchhoff Inst. Phys.)
Publication	2008 - 160.
Thesis note	PhD : Heidelberg U. : 2008
Thesis supervisor(s)	Meier, Karlheinz
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Keywords	Calorimeter ; calibration ; jet ; trigger ; Level-1 trigger ; ATLAS ; Multi-Chip Module ; JES ; MCM ; jet calibration
Abstract	The Pre-Processor system of the ATLAS Level-1 Calorimeter Trigger performs complex processing of analog trigger tower signals from electromagnetic and hadronic calorimeters. The main processing block of the Pre-Processor System is the Multi-Chip Module (MCM). The first part of this thesis describes MCM quality assurance tests that have been developed, their use in the MCM large scale production and the results that have been obtained. In the second part of the thesis a validation of a shower parametrisation model for the ATLAS fast simulation package ATLFAST based on QCD dijet events is performed. A detailed comparison of jet response and jet energy resolution between the fast and the full simulation is presented. The uniformity of the calorimeter response has a significant impact on the accuracy of the jet energy measurement. A study of the calorimeter intercalibration using QCD dijet events is presented in the last part of the thesis. The intercalibration study is performed in azimuth angle phi and in pseudorapidity eta. The performance of the calibration methods including possible systematic and statistical effects is described.

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