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Laser-driven hard X-ray source for imaging applications
Lamač, Marcel ; Nejdl, Jaroslav (advisor)
With the advent of high-power lasers in recent decades, a unique source of hard X-ray radiation has become availible. This source of collimated, broadband, femtosecond, incoherent and hard X-ray radiation is produced when a focused laser with intensity above 10^18 W/cm^2 collides with a gas target. The strong electric field of the laser pulse ionizes the gas and interacts with the plasma generating a strong plasma wake wave. This space charge separation inside the target generates longitudal electric fields of the order of 100 GV/m. This resulting electrostatic wakefield accelerates the electrons to relativistic velocities and causes them to travel in oscillatory motion behind the laser pulse, producing hard and collimated X-ray radiation. This thesis is focused on a theoretical evaluation and an experimental design of this laser-plasma X-ray source. Furthermore, we consider the source's unique properties for novel imaging applications.
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Diagnostics of relativistic electron beams from laser accelerators
Bratko, Maroš ; Nejdl, Jaroslav (advisor) ; Kozák, Martin (referee)
Since the rise of high-energy particle physics in the 20th century, demands for radio-frequency particle accelerators have been increasing, leading to facili- ties occupying tens of square kilometers, requiring massive infrastructure, and having a very high cost. A promising alternative is laser wakefield acceleration, commonly referred to as LWFA, which is based on the interaction of intense laser pulse with the plasma. This technology produces accelerating fields four orders of magnitude larger than radio-frequency particle accelerators, greatly reducing its size. To evaluate the quality, stability, and reliability of the LWFA, properties of electron bunches emerging from the accelerator have to be inves- tigated. The most important properties of electron bunches include the bunch charge, i.e. number of electrons in the bunch, energy distribution, divergence, bunch size, beam emittance, and pointing stability. This thesis is focused on the tools and detectors necessary for measuring these properties. 1
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Laser-driven hard X-ray source for imaging applications
Lamač, Marcel ; Nejdl, Jaroslav (advisor) ; Kozák, Martin (referee)
With the advent of high-power lasers in recent decades, a unique source of hard X-ray radiation has become availible. This source of collimated, broadband, femtosecond, incoherent and hard X-ray radiation is produced when a focused laser with intensity above 10^18 W/cm^2 collides with a gas target. The strong electric field of the laser pulse ionizes the gas and interacts with the plasma generating a strong plasma wake wave. This space charge separation inside the target generates longitudal electric fields of the order of 100 GV/m. This resulting electrostatic wakefield accelerates the electrons to relativistic velocities and causes them to travel in oscillatory motion behind the laser pulse, producing hard and collimated X-ray radiation. This thesis is focused on a theoretical evaluation and an experimental design of this laser-plasma X-ray source. Furthermore, we consider the source's unique properties for novel imaging applications.
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Výběr nového dodavatele ve firmě INVEST TEL AUTO s.r.o.
Hasmanová, Alena ; Fiala, Petr (advisor) ; Nejdl, Jaroslav (referee)
Cílem diplomové práce je aplikace modelů vícekriteriálního rozhodování na reálný rozhodovací problém ve firmě INVEST TEL AUTO s.r.o. V praktické části je pomocí několika metod vícekriteriálního hodnocení variant nejprve vybrána nejvhodnější automobilová značka, poté je pomocí metod spojitého vícekriteriálního rozhodování navržena skladba první objednávky vozů vybrané automobilové značky.
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