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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Time Calibration and Response of the Hadronic ATLAS Tile Calorimeter
 Divíšek, Martin ; Davídek, Tomáš (advisor) ; Rybář, Martin (referee)
The performance of the Tile Calorimeter is heavily dependent on the proper calibra- tion of the detector response with respect to energy of the incident particles and the time of their arrival into the detector. A sophisticated calibration system is put in place to ensure the quality of the data yielded by the calorimeter. In our thesis, we describe improvements we have made to the processing software for the laser calibration and time monitoring of the detector. An analysis of their impact on the data quality improvements carried out during the reprocessing of detector data in 2022 is also included. Reprocessed data has been used to establish a time resolution estimate of the detector for 2022, as well as a more detailed performance breakdown on a per-layer basis. Since their development, our software modifications are seeing use during routine data quality verification (such as during the 2023 data reprocessing) as well as searches for long-lived heavy exotics at the LHC. 1
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Time calibration of the ATLAS Tile Calorimeter
 Divíšek, Martin ; Davídek, Tomáš (advisor) ; Faltová, Jana (referee)
Following the end of the maintenance period for the ATLAS detector in LHC, CERN, a series of calibrations have to be performed to ensure the quality of measured data. This thesis details the work done on time calibrations of the Tile Hadronic Calorimeter. The Tile Calorimeter uses multiple time calibration methods; these include calibration via laser (a precise light input sent to the detector's photomultipliers), and splash events analysis (measuring the overall response to high-energy particles traversing the length of the calorimeter). Several available sets of laser and splash data were analysed to determine necessary adjustments to the internal electronics and appropriate software going forward. As of April 2022, we have been able to calibrate roughly two thirds of the calorimeter, and will continue calibration once we can acquire additional data. 1
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3 Divíšek, Michal
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