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Refactoring of the data quality monitoring system in the Belle II vertex detector
Bártík, Jáchym ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
This bachelor thesis deals with refactoring of a part of the Data Quality Monitoring (DQM) code for the Belle II vertex detector. In the second part of the thesis, monitoring of vertex detector half-shells movement over time is implemented. After summarizing the basic information about the Belle II experiment, its vertex detector and the basf2 software system, we will describe the functional behaviour of the data quality monitoring modules. We analyze the code of the TrackDQM and AlignDQM modules and fix several errors. As a part of refactoring, we divide the calculations into several simpler parts and significantly reduce the code duplication. Finally, we add histograms of residuals from the half-shells, which we evaluate on real data, fit and display as a function of time. The contribution of this work is a code that is easier to maintain and extend, as well as free of some obvious bugs. Another result is a discovery of periodical movements of vertex detector half-shells, the understanding of which can lead to improvement of detector alignment. 1
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Validation of silicon detector simulations for the Belle II experiment
Fajt, Lukáš ; Kvasnička, Peter (advisor) ; Drásal, Zbyněk (referee)
Title: Validation of silicon detector simulations in the Belle II experiment Author: Lukáš Fajt Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Peter Kvasnička, Institute of Particle and Nuclear Physics Abstract: This bachelor thesis deals with testing of simulations for planned combined Belle II PXD and SVD testbeam at DESY, Germany. This testbeam is going to study the function of a setup of six detectors, two DEPFET pixel detectors and four strip detectors, which corresponds to the actual arrangement of the internal detector of the newly built experiment Belle II in KEK, Japan. For the purpose of testing a new module in the basf2 Belle II software framework was developed. This module should also be used in the future for analysis of experimental data from the testbeam and to compare the results with simulations. In addition to the theoretical knowledge about the Belle II experiment, silicon detectors and basf2, experience with experi- mental work in the clean room at IPNP was obtained. The theoretical part of this work reviews the physical motivation of the experiment as well as the arrangement and operation of the Belle II detector. In the second part we discuss silli- con detectors with an emphasis on DEPFET detectors. We then describe the Belle II software framework, basf2,...
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Use of kinematic-constrained decays in the alignment of the Belle II detector.
Kaplan, Martin ; Kodyš, Peter (advisor) ; Kvasnička, Peter (referee)
This thesis is a Monte Carlo study of several distinct samples and some of their combinations for track-based alignment of tracking detectors at the Belle II experiment. Simultaneous alignment of drift chamber layers, vertex detector sensors including their deformation parameters and vertex detector half-shells is performed using a set of linear constraints. Samples of muon tracks from cosmic rays, muon pairs from the e+ e− → µ+ µ− process with and without the inter- action point vertex constraint and muon pairs from the kinematic-constrained J/Ψ → µ+ µ− decay are studied. Performance of certain combinations of sam- ples in the alignment procedure of the tracking detectors is analyzed. One combination of samples is identified as a suitable sample for the alignment of the real detector, which started its operation in spring 2019 and thus the results of this thesis present a first comprehensive analysis of systematic and statistical errors associated with a realistic scenario of the Belle II detector. 1
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Refactoring of the data quality monitoring system in the Belle II vertex detector
Bártík, Jáchym ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
This bachelor thesis deals with refactoring of a part of the Data Quality Monitoring (DQM) code for the Belle II vertex detector. In the second part of the thesis, monitoring of vertex detector half-shells movement over time is implemented. After summarizing the basic information about the Belle II experiment, its vertex detector and the basf2 software system, we will describe the functional behaviour of the data quality monitoring modules. We analyze the code of the TrackDQM and AlignDQM modules and fix several errors. As a part of refactoring, we divide the calculations into several simpler parts and significantly reduce the code duplication. Finally, we add histograms of residuals from the half-shells, which we evaluate on real data, fit and display as a function of time. The contribution of this work is a code that is easier to maintain and extend, as well as free of some obvious bugs. Another result is a discovery of periodical movements of vertex detector half-shells, the understanding of which can lead to improvement of detector alignment. 1
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Use of kinematic-constrained decays in the alignment of the Belle II detector.
Kaplan, Martin ; Kodyš, Peter (advisor) ; Kvasnička, Peter (referee)
This thesis is a Monte Carlo study of several distinct samples and some of their combinations for track-based alignment of tracking detectors at the Belle II experiment. Simultaneous alignment of drift chamber layers, vertex detector sensors including their deformation parameters and vertex detector half-shells is performed using a set of linear constraints. Samples of muon tracks from cosmic rays, muon pairs from the e+ e− → µ+ µ− process with and without the inter- action point vertex constraint and muon pairs from the kinematic-constrained J/Ψ → µ+ µ− decay are studied. Performance of certain combinations of sam- ples in the alignment procedure of the tracking detectors is analyzed. One combination of samples is identified as a suitable sample for the alignment of the real detector, which started its operation in spring 2019 and thus the results of this thesis present a first comprehensive analysis of systematic and statistical errors associated with a realistic scenario of the Belle II detector. 1
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Simulation of noise in the Belle II strip vertex detector
Gruberová, Zuzana ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
Title: Simulation of noise in the Belle II strip vertex detector Author: Zuzana Gruberová Institute: Institute of Particle and Nuclear Physics Supervisor: RNDr. Peter Kvasnička, Institute of Particle and Nuclear Physics Abstract: This bachelor thesis describes the development of strip noise simulation for the Belle II strip vertex detector (SVD). The overview part of the thesis describes the Belle II experiment and its detector system. The next part summarizes the basic princi- ples of semiconductor detectors with a focus on electronic noise. This section is followed by a more detailed description of Belle II SVD, its noise characteristics and simulation methods. The methods part introduces basic concepts of noise simulation using ma- chine learning methods, in particular, artificial neural networks. The experimental part describes the development and implementation of a production noise generator, and dis- cusses the performance, precision, and alternative solutions. Keywords: particle physics, Belle II, strip detector, noise, simulation, neural network 1
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Tests of Silicon detectors for the ATLAS detector upgrade
König, Vít ; Doležal, Zdeněk (advisor) ; Kvasnička, Peter (referee)
Title: Tests of Silicon detectors for the ATLAS detector upgrade Author: Vít König Department: Institute of Particle and Nuclear Physics Supervisor: doc. RNDr. Zdeněk Doležal, Dr., IPNP Abstract: This thesis is focused on the testing of prototypes of strip silicon detectors for the modernization of ATLAS detector on ATLAS Upgrade. These tests take place at the Department of Silicon Detectors at the Institute of Particle and Nuclear Physics. The main focus of this work is the description of tests of Front-end parameters of the detector using the calibration charge and laser. The first chapter of this thesis briefly describes, how the experiment in particle physics works, and summarizes the basic facts about the ATLAS detector and its upgrading. The second chapter describes the physical properties of semiconductors that are needed to understand the principle of particle detection by silicon detectors. It also describes how to read and process information from the detector. The third and fourth chapters describe the testing of FE parameters of the detector, done itself by the author of this work. Conclusions from these measurements will serve to further tests of strip silicon detectors for ATLAS Upgrade. Keywords: ATLAS Upgrade, laser tests, Front-end elektronic, strip silicon detector
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Tests of Silicon detectors for the ATLAS detector upgrade
Janitorová, Lýdia ; Doležal, Zdeněk (advisor) ; Kvasnička, Peter (referee)
Nowadays, the detector ATLAS is modernized to ATLAS Upgrade. The Insti- tute of Particle and Nuclear Physics contributes to it by testing and production of silicon detection modules, which will be used for this purpose. This thesis is focused on the development of methods of accurate assembling of detection mo- dules, especially to verify that the chips are properly glued to the hybrid using the ConoScan 4000 metrological station. One of the measurement outputs are three coordinates of the corners of the chips. To achieve higher accuracy, instead of determining the coordinate z of the chip relative to the ConoScan reference system, the height was determined relative to the hybrid. For each chip, the angle of rotation was determined in the individual planes. To verify the reproducibility of the measurement by ConoScan, 50 identical measurements of the hybrid profile were scanned, from which the processed results are plotted in histograms. Better results can be achieved by selecting a smaller scanning step of ConoScan along the x and y axes. 1
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Simulation of Belle II physics events and performance tests of reconstruction software
Kandra, Jakub ; Kvasnička, Peter (advisor) ; Řezníček, Pavel (referee)
This thesis is about the alignment of vertex semiconductor detectors of the Belle II experiment. It is divided into several sections. The first part introduces the Belle II experiment as a new generation B- factory, with its ambitious plans of data taking and physical analysis. The second part follows with a more detailed description of Belle II detector and software tools designed for their alignment and calibration. The central part of the thesis describes physical processes used for calibration of the vertex detector, connected with the search of an optimal solution for run-time monitoring and calibration of the detector. We also tested the effect of misalignment on the Belle II tracking software. The following part gives results of the study of misalignment effects on physical observables related to analysis of selected physical channels. The last part describes the development of a data quality monitoring tool for the tracking system. The tools has to provide a run-time diagnostic of misalignment and miscalibration by monitoring the precision and accuracy of reconstruction of physical observables. Powered by TCPDF (www.tcpdf.org)
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