Publicação
Commissioning of the TileCal ATLAS hadronic calorimeter with cosmic rays and the LHC single beam
| Resumo: | After commissioning, the LHC at CERN will begin operations and its experiments will be ready for collecting data. One of the experiments is ATLAS which includes the TileCal hadronic calorimeter as one of its sub-detectors. The main purpose of TileCal is to measure the energy and direction of the hadronic jets produced by the proton-proton collisions in LHC. In this thesis, TileCal will be introduced in context to LHC and ATLAS. The commissioning of TileCal, namely in what concerns its time and energy response will be presented. The timing studies used LHC’s single beam and resulted in a correction to the light velocity in the clear fibers of the LASER calibration system. This velocity was estimated to be 18.6±2.01cm ns¹. The energy response studies validated the track reconstruction algorithm (TileMuonFitter) using both Monte Carlo and cosmic muon real data. This algorithm was used to optimize the energy response uniformity of TileCal and also for verifying the Cs system energy scale correction between 2008 and 2009 data. New developments for the algorithm were shown to improve the consistency between the energy loss measured in the calorimeters and the momentum difference measured between the Inner Detector and Muon Spectrometer issue. |
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| Autores principais: | Ribeiro, Nuno Miguel Pinto Figueiredo Raimundo |
| Assunto: | TileCal Certificação Muões cósmicos Tempo Energia Teses de mestrado - 2009 |
| Ano: | 2009 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | After commissioning, the LHC at CERN will begin operations and its experiments will be ready for collecting data. One of the experiments is ATLAS which includes the TileCal hadronic calorimeter as one of its sub-detectors. The main purpose of TileCal is to measure the energy and direction of the hadronic jets produced by the proton-proton collisions in LHC. In this thesis, TileCal will be introduced in context to LHC and ATLAS. The commissioning of TileCal, namely in what concerns its time and energy response will be presented. The timing studies used LHC’s single beam and resulted in a correction to the light velocity in the clear fibers of the LASER calibration system. This velocity was estimated to be 18.6±2.01cm ns¹. The energy response studies validated the track reconstruction algorithm (TileMuonFitter) using both Monte Carlo and cosmic muon real data. This algorithm was used to optimize the energy response uniformity of TileCal and also for verifying the Cs system energy scale correction between 2008 and 2009 data. New developments for the algorithm were shown to improve the consistency between the energy loss measured in the calorimeters and the momentum difference measured between the Inner Detector and Muon Spectrometer issue. |
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