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Silicon detector response and its simulation
Martausová, Lýdia ; Kodyš, Peter (advisor) ; Řezníček, Pavel (referee)
The ATLAS experiment is currently undergoing a modernization, called the ATLAS Upgrade. Nowadays, simulations are an important part of planning new detectors and their modernization. They help us optimize their design before production and later verify the results obtained from the experiment. This work is focused on the simulation of edge eects on a silicon strip detector using a framework Allpix2 . In the beginning, we had no information, that any edge eects or even any irregular eects, is possible to simulate in Allpix2 . We rst veried that in the case of a simple irregular electric eld. We had at our disposal measurements performed at the Institute of Particle and Nuclear Physics, with which we compared the simulation. The signal obtained from the edge strip has dierent behaviour and is wider than the other strips. Therefore, we extended the electric eld of the edge strip in the simulation and modied it in various ways. 1
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Tests of Semiconductor Detectors for ATLAS Upgrade
Martaus, Marek ; Kodyš, Peter (advisor) ; Rybář, Martin (referee)
The semiconductor detectors of ATLAS experiment at CERN are exposed to high radiation for a long time, which reduces their efficiency. They need to be replaced and, if necessary, modernized. Nowadays, the entire Large Hadron Collider is planned to improve. Its luminosity will increase. During this shut- down, the detectors of ATLAS experiment will also be upgraded. This thesis is focused on strip detectors of a new inner detector of ATLAS experiment called ITk. For the correct interpretation of the measured results, it is important to know the detector's response. Test of detector response is, therefore, an important part of the process of developing. In this thesis, we focused on detectors' edges, where we assumed a different shape of the electric field, which may cause a different response. We chose the laser test because it is a position-sensitive measurement. 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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Tests of Semiconductor Detectors in Prague Laboratory
Krásny, Peter ; Kodyš, Peter (advisor) ; Carli, Ina (referee)
This thesis is focused on the usage of silicon semiconductor detectors in ATLAS experiment and automation of safe cooling and heating processes needed during the tests performed on detectors at a given tem- perature. The tests take place in the freezer environment with the place of interest where the detector is to be placed required to stay dry throughout the entire test. This is secured by monitoring the temperature and rela- tive humidity of the environment using Interlock device with sensors and by automatic calculation of the dew point temperature without any supply of nitrogen commonly used in other set ups of the tests. Both cooling and heating processes are being prepared to be fully automatized, reducing the amount of manual handling required to minimum which helps to maintain the conditions and safe run of the test. 1
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Beta Source Tests of Semiconductor Detectors ITk for ATLAS Upgrade
Kovanda, Ondřej ; Kodyš, Peter (advisor) ; Scheirich, Daniel (referee)
Beta Source Tests of Semiconductor Detectors ITk for ATLAS Upgrade Abstract: The ATLAS experiment is due to undergo a major upgrade for the High Luminosity phase of the LHC operation. In particular, the current tracking system (ID) will be replaced by full-silicon ITk. IPNP laboratories are involved in R&D of SCT detector modules for ITk. Low-temperature β-source tests of the R0 FR 5 module prototype were the main focus of this thesis. After testing the cooling cycle, 11 threshold scans were performed on two ABC130 chips, yielding the median collected charge ranging between 2.9 ± 0.2 fC and 3.1 ± 0.2 fC for chip #6 at SNR from 16.0 ± 1.0 at 24 ◦ C to 22.7 ± 1.5 at −15 ◦ C. No trend with temperature was observed outside the error bars. The results are in accordance with previous similar measurements. Question of fitting the median collected charge in various units was adressed and equivalence of the fits was determined. The ability of IPNP laboratories to perform low-temperature β-source tests was proven.
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Simulation and Tests of Strip Semiconductor Detectors for ATLAS Upgrade
Theiner, Ondřej ; Kodyš, Peter (advisor) ; Řezníček, Pavel (referee)
Together with the ongoing works on preparations of High-Luminosity LHC, there is a need to enhance the performance of various experiments on the collider as well. This is also the case of the experiment ATLAS and its subdetectors such as Inner Detector which will be completely replaced by new all-silicon Inner Tracker (ITk). This thesis deals with computer simulations of silicon strip detec- tors for ATLAS Upgrade ITk. For this purpose, we are using framework AllPix2 . It enables to simulate everything from the interaction of the particle with silicon, charge propagation in electric and magnetic fields, charge collection, up to signal digitization. We focused mostly on three aspects in the simulations. The first is a precise characterization of used detectors, the second is a simulation of a test beam measurements and the third one is a simulation of test measurements with a radioactive beta source. We also discussed the possibility of simulation of test measurements with a laser. These simulations are important not only because they help us to better understand processes happening inside the detector, but they are also used as a validation of testing measurements. As a result of this, we are able to point out the effects of the experimental setup (or detector itself) which have an impact on measured...
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Automation of Semiconductor Detector Tests for ATLAS Upgrade
Martaus, Marek ; Kodyš, Peter (advisor) ; Řezníček, Pavel (referee)
After many years of operation of a Large Hadron Collider, it is necessary to modernize it. The next upgrading will also include an ATLAS detector upgrade. This work is devoted to the development of workflows of testing the silicon strip detectors used in the new ATLAS inner detector. The laser testing method was chosen for the needs of this work. In the first chapters of this work, the reader will learn about the principle of semiconductor detectors, their testing and use in ATLAS. The fourth chapter is devoted to the description of used equipment. The fifth chapter shows the results of the module testing. Discussion of measured results is devoted to chapter six. 1
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Tests of Semiconductor Detectors for ATLAS Upgrade
Theiner, Ondřej ; Kodyš, Peter (advisor) ; Řezníček, Pavel (referee)
Together with the planned upgrade of the Large Hadron Collider at CERN, a lot of experiments on the LHC will have to be improved as well. This is also the case of the ATLAS experiment. This thesis focuses on laser testing of silicon strip detectors which will be part of the Inner Tracker in the improved ATLAS Upgrade experiment. The first two parts of the thesis describe the ATLAS Up- grade experiment and summarise the basic theory behind silicon strip detectors. The third and the main part of the thesis is dedicated to experimental part of my work, which consisted of the actual laser testing of silicon strip detectors. The fourth chapter discusses the results of my measurements. All the tests presented in this thesis were performed in the laboratory of the Institute of Particle and Nuclear Physics in Prague. Besides having performed the measurements of de- tection properties of strip detectors, several ROOT macros for automatization of these measurements were written.
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Tests of Semiconductor Detectors for ATLAS Upgrade
Sýkora, Martin ; Kodyš, Peter (advisor) ; Mikeštíková, Marcela (referee)
This thesis is focused on beta source tests of prototypes of ITk Strip modules at IPNP in Prague in the framework of the ATLAS Upgrade project. New expe- rimental apparatus will allow comparison of beta source test results with other testing methods including laser or test beam. I participated in the assembly of the whole apparatus, script development for a number of automated measurements using specialized ITSDAQ software and ROOT. Finally, summary of obtained properties of tested end-cap R0 DAQload with mini sensor is provided based on beta source tests and characterization of the readout chip. The resulting collec- ted charge value corresponds to 3.1 fC and together with often referred quantity signal-to-noise ratio, which equals 35, it is one of the most important results of the thesis. The experimental arrangement including overall analysis of results will be usable for the future production phase of the project. 1
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Tests of Silicon detectors for the ATLAS detector upgrade
Mészárosová, Lucia ; Doležal, Zdeněk (advisor) ; Kodyš, Peter (referee)
The main goal of this bachelor thesis is to describe upcoming experiment ATLAS Upgrade and to compare it with present ATLAS, to describe upcoming tests of detectors and our own tests of prototypes of strip silicon detectors for the ATLAS Upgrade. Thesis is divided into three chapters. The first chapter is dedicated to the research facility CERN, specifically the present detector ATLAS, its inner detector and strip silicon detectors. In the next part there is characterized planned detector ATLAS Upgrade and again its inner detector and strip detectors. In the end of this part there is a tabular comparison of ATLAS and ATLAS Upgrade. The last chapter deals with the testing of detectors, at first routine testing of detectors in the past for ATLAS and planned routine tests for ATLAS Upgrade, and finally there are described our own tests of prototype the strip silicon detectors in FZÚ AV ČR supervised by Ing. Marcela Mikeštíková, Ph.D.
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