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Interaction of tokamak plasma with selected fusion materials
Klevarová, Veronika ; Janeček, Miloš (advisor) ; Horáček, Jan (referee)
Title: Interaction of tokamak plasma with selected fusion materials Author: Veronika Klevarová Department: Department of Physics of Materials Supervisor: Doc. RNDr. Miloš Janeček, CSc. Supervisor's e-mail address: Milos.Janecek@mff.cuni.cz Abstract: The following work is devoted to structural analysis and study of relevant physical properties of materials with perspective use for the first wall and as construction materials of the tokamak device, prior to their interaction with the high-temperature plasma in Compass-D tokamak. The theoretical part contains an introduction to the interaction of tokamak plasma with fusion materials, including a description of the processes taking place during the plasma discharge (such as implantation, erosion, particles traveling in the tokamak vacuum vessel, redeposition, co-deposition with tritium etc.) and selection of appropriate fusion materials. The experimental part consists of structural analysis of selected materials by optical and scanning electron microscopy. Analysis of the structure revealed the presence of oxide layers in some samples prepared by the technology of plasma spraying; which was probably caused by sample preparation in the ambient air. Qualitative elemental analysis of the samples was performed by electron dispersive X-ray spectroscopy (EDS) in SEM....
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Materiály pro fúzní aplikace a jejich interakce s tokamakovým plazmatem
Klevarová, Veronika ; Janeček, Miloš (advisor) ; Šíma, Vladimír (referee)
Title: Materials for fusion applications and their interaction with tokamak plasma Author: Veronika Klevarová Department: Department of Physics of Materials Supervisor: doc. RNDr. Miloš Janeček, CSc., Department of Physics of Materials Abstract: Tungsten represents a perspective option in the context of fusion devices first-wall materials. In the first part of this work, set of tungsten samples with variable grain size was prepared by spark plasma sintering. Specimens were exposed to steady state deuterium plasma beam and high energy heat pulses, simulating thus the normal operation in the tokamak. As a consequence of the exposure, samples surfaces were roughened, as-prepared grains were recovered and in some cases cracks were formed. Moreover, post-irradiation analysis of the damaged samples revealed activation of in-grain slip systems within the loaded surfaces. Threshold grain diameter for this mechanism was determined to be between 5.5 - 6.6 μm at the particular loading conditions. However, damaged features showed to depend more on the fabrication parameters than on the grain diameter. Synergistic effects of simultaneous loading were proven to be important since those reduced the heat propagation within the volume of the tested samples. In the second part of this thesis, introduction to plasma-surface...
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Interaction of tokamak plasma with selected fusion materials
Klevarová, Veronika ; Janeček, Miloš (advisor) ; Horáček, Jan (referee)
Title: Interaction of tokamak plasma with selected fusion materials Author: Veronika Klevarová Department: Department of Physics of Materials Supervisor: Doc. RNDr. Miloš Janeček, CSc. Supervisor's e-mail address: Milos.Janecek@mff.cuni.cz Abstract: The following work is devoted to structural analysis and study of relevant physical properties of materials with perspective use for the first wall and as construction materials of the tokamak device, prior to their interaction with the high-temperature plasma in Compass-D tokamak. The theoretical part contains an introduction to the interaction of tokamak plasma with fusion materials, including a description of the processes taking place during the plasma discharge (such as implantation, erosion, particles traveling in the tokamak vacuum vessel, redeposition, co-deposition with tritium etc.) and selection of appropriate fusion materials. The experimental part consists of structural analysis of selected materials by optical and scanning electron microscopy. Analysis of the structure revealed the presence of oxide layers in some samples prepared by the technology of plasma spraying; which was probably caused by sample preparation in the ambient air. Qualitative elemental analysis of the samples was performed by electron dispersive X-ray spectroscopy (EDS) in SEM....
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