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Forward and Backward Modelling of Spectroscopic Diagnostics in Fusion Plasmas
Tomeš, Matěj ; Seidl, Jakub (advisor) ; De Bock, Maarten (referee) ; Den Hartog, Daniel J. (referee)
Title: Forward and Backward Modelling of Spectroscopic Diagnostics in Fusion Plasmas Author: Matěj Tomeš Department: Department of Surface and Plasma Science Supervisor: Mgr. Jakub Seidl, Ph.D., Institute of Plasma Physics of the Czech Academy of Sciences Abstract: The thesis primarily focuses on developing forward and backward models for fusion diagnostics. It encompasses the development and application of these models for Thomson scattering, the inference of neon concentrations in JET's divertor and for synchrotron radiation. In the first chapter, the forward model of Thomson scattering designed for Cherab is detailed. This includes the development of a laser module intended for a wide range of applications, primarily to facilitate Thomson scattering simulations. An application example is provided by a comprehensive model of the Thomson scattering diagnostic used at the COMPASS tokamak. The model of the diagnostic is combined with experimentally obtained electron profiles to assess its performance. The second half of the chapter focuses on the development of a backward model for Bayesian inference of temperature profiles from measured Thomson scattering data. The effectiveness of this model is compared to the conventional approach based on least square error optimization, revealing clear advantages of...
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Evaluation of the Financial Situation of a Company and Proposals to its Improvement
Seidl, Jakub ; Kožoušek, Tomáš (referee) ; Karas, Michal (advisor)
This bachelor’s thesis is focused on evaluation of financial situation of industrial company and suggestions for improvement for this situation in years 2011 to 2016 in P-D Refractories CZ a.s. First chapter of this bachelor’s thesis is focused on goals, methods and processes. Second part is interested in information about company and theoretical solution for financial analysis. Third chapter includes already analysis and evaluation of the state of company. Last chapter gives own suggestions for improvement of the situation in P-D Refractories CZ a.s.
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A Draft of a Corporate Financial Plan
Seidl, Jakub ; Ing. Martin Liebl, MBA, LL.M., DBA (referee) ; Karas, Michal (advisor)
This master’s thesis is focused on a Draft of a Corporate Financial Plan for industrial company P-D Refractories CZ a.s. for years 2019 to 2022. First chapter of this master’s thesis is oriented in goals, methods and approaches of this thesis. Next part is aiming at theoretical solution for financial planning. Third chapter contains information about analyzed company, application of selected methods of strategic analysis and financial analysis including evaluation of the state of company and detection of potential deficiencies. Last chapter of this thesis is focused on suggestion, formation and evaluation of the financial plan for P-D Refractories CZ a.s. for next four years.
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Anomalous diffusion of plasma in tokamak edge region
Seidl, Jakub ; Krlín, Ladislav (advisor) ; Hrach, Rudolf (referee) ; Rohlena, Karel (referee)
Title: Anomalous diffusion of plasma in tokamak edge region Author: Jakub Seidl Tutoring institution: Institute of Plasma Physics AS CR, v.v.i. Supervisor: Doc. Ing. Ladislav Krlín, DrSc., IPP AS CR Consultant: RNDr. Radomír Pánek, Ph.D., IPP AS CR Abstract: This work provides brief introduction to the topic of plasma turbu- lence in tokamak edge region and several aspects of anomalous plasma diffusion are discussed. We use numerical code ESEL to model interchange turbulence and investigate properties of turbulent structures in different regimes of parallel trans- port. Means of experimental verification of the results are discussed. Results of the modelling are then used to interpret unexpected results experimentally obtained by electrostatic ball-pen probes on tokamak ASDEX Upgrade, mainly appearance of a 'bump' in power spectra of measured plasma potential. Next, we explain be- haviour of cross-correlation function of density signals measured by two spatially separated Langmuir probes in the vicinity of magnetic separatrix and we point out an ambiguity in interpretation of results of vorticity measurement made by set of floating Langmuir probes. In the last part, transport of plasma impurities by electrostatic turbulent potential is modelled. We identify reversal of radial particle velocity for particles with...
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A Draft of a Corporate Financial Plan
Seidl, Jakub ; Ing. Martin Liebl, MBA, LL.M., DBA (referee) ; Karas, Michal (advisor)
This master’s thesis is focused on a Draft of a Corporate Financial Plan for industrial company P-D Refractories CZ a.s. for years 2019 to 2022. First chapter of this master’s thesis is oriented in goals, methods and approaches of this thesis. Next part is aiming at theoretical solution for financial planning. Third chapter contains information about analyzed company, application of selected methods of strategic analysis and financial analysis including evaluation of the state of company and detection of potential deficiencies. Last chapter of this thesis is focused on suggestion, formation and evaluation of the financial plan for P-D Refractories CZ a.s. for next four years.
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Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
Seidl, Jakub ; Jiráková, Kateřina ; Adámek, Jiří ; Grover, Ondřej ; Horáček, Jan ; Hron, Martin ; Vondráček, Petr
We have identified two distinct types of turbulent fluctuations in COMPASS plasmas, the high-frequency edge oscillations and low-frequency SOL blobs. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of isat fluctuations is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL. This supports, together with turbulence spreading rate being positive in the near SOL but negative in the edge, the picture presented in [3] that most of the fluctuations that form a positive skewness in the edge region disappear around LCFS and new blobs are formed in the near SOL. Further, we cannot confirm the assumption that the blobs are generated randomly according to a Poisson process. Oscillations of all measured quantities, incl. radial particle flux, in the near SOL are peaked around ∼13 kHz. This seems to correspond to a poloidally rotating structure with a rather large poloidal wave-length ∼ 15 − 20 cm, that at least partly modulates blob generation. Nevertheless, we note that time separation of blobs becomes more random further in the SOL, possibly due to differences in their individual propagation. These observations hold for diverted plasmas, but the situation may be different in limited low-elongation plasmas where the radius of zero skewness was observed to be shifted significantly (several cm) inwards, compared to diverted configuration, and Gamma-like PDF is detected even inside the LCFS. Study of these plasmas is ongoing.
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Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
Seidl, Jakub ; Jiráková, Kateřina ; Adámek, Jiří ; Grover, Ondřej ; Horáček, Jan ; Hron, Martin ; Vondráček, Petr
In this work we study properties of turbulent structures in the scrape-off layer (SOL) and edge plasma of the COMPASS tokamak. Two distinct types of coherent oscillations are observed: a) broadband high frequency branch rotating in the electron diamagnetic direction, appearing mainly in the confined region but protruding also to the SOL b) low-frequency blobs rotating in an opposite poloidal direction, formed in the vicinity of the radius of zero electric field. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of fluctuations of the ion saturation current is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL and most of the fluctuations that form a positive skewness in the edge region disappear around LCFS.
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Evaluation of the Financial Situation of a Company and Proposals to its Improvement
Seidl, Jakub ; Kožoušek, Tomáš (referee) ; Karas, Michal (advisor)
This bachelor’s thesis is focused on evaluation of financial situation of industrial company and suggestions for improvement for this situation in years 2011 to 2016 in P-D Refractories CZ a.s. First chapter of this bachelor’s thesis is focused on goals, methods and processes. Second part is interested in information about company and theoretical solution for financial analysis. Third chapter includes already analysis and evaluation of the state of company. Last chapter gives own suggestions for improvement of the situation in P-D Refractories CZ a.s.
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Political behavior of the Andalusians
Seidl, Jakub ; Urban, Traian (advisor) ; Mejstřík, Martin (referee)
This study concerns the political behavior of the Andalusians and its reasons. In this autonomous community exists a traditional tendency to support the left-wing party PSOE. The object of this study is an analysis of this political trend and the aim is to explain why this phenomenon exists in the society. There is discovered the link between historical, sociopolitical and economical factors and the voting behavior of the Andalusians. The study is divided into a factographic and an analytical chapter. The first chapter includes a recapitulation of the results of autonomic elections and also there is an outline of the political behavior using the output of public opinion polls. These data are mentioned also in the next part of the study where are explained more deeply. The analytical chapter concerning the support of PSOE and its reasons is divided into parts following the character of the circumstanses affecting the political behavior. The first chapter is about historical factors, the second one about sociopolitical issues and the last one about economical factors. The main historical questions are the underdevelopment and poverty, the satisfaction paradox and the problem of latifundium. The sociopolitical factors include the political culture and nationalism and the chapter about economical...
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Anomalous diffusion of plasma in tokamak edge region
Seidl, Jakub ; Krlín, Ladislav (advisor) ; Hrach, Rudolf (referee) ; Rohlena, Karel (referee)
Title: Anomalous diffusion of plasma in tokamak edge region Author: Jakub Seidl Tutoring institution: Institute of Plasma Physics AS CR, v.v.i. Supervisor: Doc. Ing. Ladislav Krlín, DrSc., IPP AS CR Consultant: RNDr. Radomír Pánek, Ph.D., IPP AS CR Abstract: This work provides brief introduction to the topic of plasma turbu- lence in tokamak edge region and several aspects of anomalous plasma diffusion are discussed. We use numerical code ESEL to model interchange turbulence and investigate properties of turbulent structures in different regimes of parallel trans- port. Means of experimental verification of the results are discussed. Results of the modelling are then used to interpret unexpected results experimentally obtained by electrostatic ball-pen probes on tokamak ASDEX Upgrade, mainly appearance of a 'bump' in power spectra of measured plasma potential. Next, we explain be- haviour of cross-correlation function of density signals measured by two spatially separated Langmuir probes in the vicinity of magnetic separatrix and we point out an ambiguity in interpretation of results of vorticity measurement made by set of floating Langmuir probes. In the last part, transport of plasma impurities by electrostatic turbulent potential is modelled. We identify reversal of radial particle velocity for particles with...
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