|
|
The spectroscopy study of focused short-wavelength laser-matter interactions
Burian, Tomáš ; Juha, Libor (advisor) ; Čuba, Václav (referee) ; Klír, Daniel (referee)
Title: The spectroscopy study of focused short-wavelength laser-matter interactions Author: Tomas Burian Department: Department of Surface and Plasma Science Supervisor: Ing. Libor Juha, CSc., Department of Radiation and Chemical Physics, Institute of Physics of the Czech Academy of Sciences, Prague Abstract: This thesis is focused on processes occurring during and immediately after an interaction of intense short-wavelength laser pulses with matter. Extreme states of matter (warm dense matter - WDM and hot dense matter - HDM), induced by EUV/SXR/X-ray lasers of two kinds, i.e., free-electron lasers (FEL) and plasma-based lasers, were investigated by emission spectroscopy over various spectral ranges and mass spectroscopic techniques. Absorption/transmission experiments revealed an effect of saturable absorption of soft X-ray laser radiation in aluminium WDM. Then, an ionisation potential depression (IPD) in dense plasmas was investigated by means of X-ray emission spectroscopy. Results obtained with the X-ray FEL-produced plasma exhibit very good agreement with computer simulations considering the Ecker-Kröll model. Analysis of optical emission spectra (OES) supports the key role played by fast recombination processes in the ablation plume created by focused short-wavelength laser beams on the solid target...
|
|
|
Relativistic effects in plasma produced with sub-nanosecond 3-TW laser
Krása, J. ; Klír, Daniel ; Řezáč, Karel ; Cikhardt, Jakub ; Krůs, Miroslav ; Velyhan, Andriy ; Pfeifer, Miroslav ; Dostál, Jan ; Dudžák, Roman ; Krupka, Michal ; Kaufman, J. ; Pisarczyk, T. ; Kalinowska, Z. ; Chodukowski, T.
This contribution deals with observations of relativistic electrons produced in a laser plasma interaction experiment at the PALS laser system operated at the Institute of Plasma Physics in Prague. The PALS laser is a near-infrared 3-TW iodine laser designed to deliver irradiance on target of 1016 Wcm2- in≈300 ps pulses at the wavelength of 1.315 μm. Various foils of 6 500 μm in thickness were irradiated with Iλ2 ≈5×1016 W cm-2 μm2 Under these conditions we have observed relativistic electrons expanding into the vacuum with maximum energy going beyond 4 MeV. The relativistically accelerated forward electrons escaping from the rear target surface were observed with the use of electron energy analysers. The observed electron energy spectra indicate that the applied laser intensity was increased by the thermal and relativistic self-focusing. The application of a unique femtosecond interferometry technique allowed us to observe bunches of thermal electrons occurring in the plasma expanding against the focused laser beam.
|
|
|
Plasma diagnostics using neutral lithium beam on the COMPASS tokamak
Háček, Pavel ; Stöckel, Jan (advisor) ; Glosík, Juraj (referee) ; Klír, Daniel (referee)
The doctoral thesis presents the diagnostic neutral lithium beam on the COMPASS tokamak in Prague. The technical part describes the system for injection of accelerated lithium beam into the COMPASS tokamak and the respective detection systems for beam emission spectroscopy. The physical part describes the analysis of measured spectroscopic data, with particular emphasis on density fluctuations in the edge plasma. Detailed analysis of turbulent structures outside of the confined plasma region is presented, as well as investigations of the ELM instabilities during high confinement mode plasma operation. The thesis also presents the development and proof-of-concept measurements of a new and unique diagnostic method - atomic beam probe. The method uses detection of the ionized part of the beam for current density profile measurements in the plasma edge.
|
|
|
Corpus Mysticum as a Relation between the Eucharist and the Church in the Work of Henri de Lubac
Klír, Daniel ; Brož, Prokop (advisor) ; Mohelník, Tomáš (referee)
Anglická anotace Name of Bachelor Thesis: Corpus Mysticum as a Relation between the Eucharist and the Church in the Work of Henri de Lubac Author: Ing. Daniel Klír, Ph.D. Faculty: Catholic Theological Faculty, Charles University in Prague Department: Department of Dogmatic and Fundamental Theology Thesis supervisor: Th.Lic. Prokop Brož, Th.D. Keywords: Body of Christ, Eucharist, Church, Middle Age, Henri de Lubac Abstract: The major concern of this bachelor thesis is the relation between the Eucharist and the Church in the work of Henri de Lubac. The thesis is divided into three chapters. The first chapter presents a brief summary of the life and work of Henri de Lubac. The second chapter delineates the origin and the basic evolution of the collocation corpus mysticum in the Middle Age. During this period, corpus mysticum signified firstly the sacramental body (9th century) and then, few centuries later, it started to signify the body, which is the Church (from 12th century). This change in the meaning of the expression in question was initiated by the Berengarian controversy. The third chapter explains the precise mean-ing of the relevant terms and texts which are important for the relation between the Eucharist and the Church. It concentrates on throwing more light on the change which took place in the...
|
guest ::
RSS feed.