Number of found documents: 602
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Alternative Methods of Permeation Barriers Preparation
Veverka, Jakub; Matějíček, Jiří
2018 - English
Permeation barriers represent one of the crucial fields in materials development for thermonuclear fusion. Primary objective of the barriers is to suppress the permeation of hydrogen isotopes (mainly tritium) from future thermonuclear fusion facilities. Secondary objective is to reduce their retention in structural materials. Expected reactor conditions put high demands on the material, as well as on the final barrier quality. Key properties are tritium permeation reduction, absence of defects (especially cracks), high-temperature stability and corrossion resistance, and compatibility with structural materials (mostly ferritic-martensitic steels). Thin nitride layers, identified as promising permeation barriers, were prepared by diffusion-based nitridation and physical vapour deposition (PVD), and characterized. Keywords: Permeation barriers; Nitride layers; PVD coating; Permeation measurement Available at various institutes of the ASCR
Alternative Methods of Permeation Barriers Preparation

Permeation barriers represent one of the crucial fields in materials development for thermonuclear fusion. Primary objective of the barriers is to suppress the permeation of hydrogen isotopes (mainly ...

Veverka, Jakub; Matějíček, Jiří
Ústav fyziky plazmatu, 2018

Feedhorn Coating - research report
Václavík, Jan
2017 - English
The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT layer. The report contains the results and comments for future construction of similar types of devices. Keywords: cnt layer; metalization; vacuum evaporation Available at various institutes of the ASCR
Feedhorn Coating - research report

The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT ...

Václavík, Jan
Ústav fyziky plazmatu, 2017

Sub-Nanosecond Laser Induced Plasma as Water Window Radiation Source.
Vrbová, M.; Vrba, Pavel
2017 - English
Laser plasma created in a krypton gas puff target is studied as a source of radiation in the water window spectral range (lambda= 2.3 - 4.4 nm). The spatial development of the plasma induced by a sub-nanosecond Nd:YAG laser pulse focused on the gas puff target is modeled using 2d RMHD code Z*. Space-time distributions of plasma quantities, namely electron temperature, electron density, mass density and plasma expansion velocity were evaluated. Instantaneous spectra during the laser pulse and during plasma decay period are also calculated. Temporal evolutions of the krypton ions relative populations prove that ions from Kr21+ and Kr22+ are responsible for dominant spectral intensity emitted at a wavelength around lambda= 3 nm. Evaluated time resolved spectra are compared with time integrated spectra obtained experimentally. Keywords: RMHD simulations; gas puff; laser plasma water window sources Available at various institutes of the ASCR
Sub-Nanosecond Laser Induced Plasma as Water Window Radiation Source.

Laser plasma created in a krypton gas puff target is studied as a source of radiation in the water window spectral range (lambda= 2.3 - 4.4 nm). The spatial development of the plasma induced by a ...

Vrbová, M.; Vrba, Pavel
Ústav fyziky plazmatu, 2017

Deformation of thin self-standing mask at inhomogeneous irradiation.
Koláček, Karel; Schmidt, Jiří; Frolov, Oleksandr; Štraus, Jaroslav; Chalupský, Jaromír; Choukourov, A.
2017 - English
Flatness of the mask is one of key features influencing the quality of image. Among factors that can affect mask flatness belongs inhomogeneous illumination. This does not apply to lithography, but to experiments that use only discrete parts of mask e.g. for nanostructuring or other type of material research. It is shown that even single EUV laser shot (laser wavelength ~46.9 nm, pulse duration ~1.5 ns, focused pulse energy ~20 .mu.J, peak fluency 48 J/cm2) not only deforms the mask, but also changes mask-substrate distance. In our case two kinds of grids (one circular with rectangular windows 7.5x7.5 μm and bars 5 micro m (period 12.5x12.5 micro m), other rectangular with rectangular windows 3.2x1.2 μm and bars 0.8 micro m (period 4x2 micro m)) were attached to PMMA substrate and exposed to one or five superimposed focused laser shots. The mask (grid) deformation was inferred from the changes of diffraction pattern engraved into PMMA. Keywords: interaction of XUV radiation with solid surface; nanostructuring; nanopatterning; XUV diffraction Available at various institutes of the ASCR
Deformation of thin self-standing mask at inhomogeneous irradiation.

Flatness of the mask is one of key features influencing the quality of image. Among factors that can affect mask flatness belongs inhomogeneous illumination. This does not apply to lithography, but to ...

Koláček, Karel; Schmidt, Jiří; Frolov, Oleksandr; Štraus, Jaroslav; Chalupský, Jaromír; Choukourov, A.
Ústav fyziky plazmatu, 2017

The role of pre-ionization on EUV capillary laser profile.
Štraus, Jaroslav; Schmidt, Jiří; Koláček, Karel; Frolov, Oleksandr
2017 - English
The profile of EUV capillary laser beam was believed to be an annulus and a corresponding theory for its explanation was generally accepted. Nevertheless, our recent detailed observation shows, that the laser profile can be remarkably influenced by the parameters of pre-pulse, serving for working gas pre-ionisation before introduction the main current into the capillary. The examples of possible profile shapes and corresponding parameters are presented. Keywords: Pre-pulse; capillary XUV laser beam profile Available at various institutes of the ASCR
The role of pre-ionization on EUV capillary laser profile.

The profile of EUV capillary laser beam was believed to be an annulus and a corresponding theory for its explanation was generally accepted. Nevertheless, our recent detailed observation shows, that ...

Štraus, Jaroslav; Schmidt, Jiří; Koláček, Karel; Frolov, Oleksandr
Ústav fyziky plazmatu, 2017

Application of Electric Probes for Study of Structure of Thermal Plasma Jet.
Hurba, Oleksiy; Hrabovský, Milan
2017 - English
Thermal plasma at atmospheric pressure was investigated. Electric probes and doable probe used as relatively simple and efficient tool for diagnostic of structure of flow field in thermal plasma jet. Were defined plasma potential and boundaries of the conducting region and their changing for the diferent operating modes of plasma torch. Keywords: Electric probes; double probe; thermal; plasma jet Available at various institutes of the ASCR
Application of Electric Probes for Study of Structure of Thermal Plasma Jet.

Thermal plasma at atmospheric pressure was investigated. Electric probes and doable probe used as relatively simple and efficient tool for diagnostic of structure of flow field in thermal plasma jet. ...

Hurba, Oleksiy; Hrabovský, Milan
Ústav fyziky plazmatu, 2017

Simulace zbytkových optických vad objektivu Merz 124/1477
Rail, Zdeněk; Melich, Zbyněk; Šrajer, Bohdan
2017 - Czech
Tento objektiv byl na Ústavu fyziky plazmatu,v.v.i., Centru Toptec v Turnově restaurován. Během tohoto procesu jsme získali možnost objektiv na optické lavici přeměřit a vyčíslit jeho zbytkové optické vady. Objektiv byl vyroben kolem roku 1860-1870. This objective lens was renoved in the Institute of Plasma Physics, v.v.i. Center Toptec in Turnov. During the process we got a possibility to measure the objective lens on the optical bench and to evaluate its residual optical aberrations. The objective lens was manufactured in 1860-1870 years Keywords: Achromatic dublet; spherochromatic aberration; coma; dispersion curve of glass; B-F chromatic correction Available at various institutes of the ASCR
Simulace zbytkových optických vad objektivu Merz 124/1477

Tento objektiv byl na Ústavu fyziky plazmatu,v.v.i., Centru Toptec v Turnově restaurován. Během tohoto procesu jsme získali možnost objektiv na optické lavici přeměřit a vyčíslit jeho zbytkové optické ...

Rail, Zdeněk; Melich, Zbyněk; Šrajer, Bohdan
Ústav fyziky plazmatu, 2017

Optické parametry význačných refraktorů
Rail, Zdeněk; Jareš, Daniel; Pintr, Pavel; Vápenka, David
2017 - Czech
V tomto referátu publikujeme optické parametry několika historických dalekohledů, které jsme v literatuře a na webových stránkách získali. Data byla vložena do optického programu ZEMAX, v němž byly vyčísleny jejich zbytkové vady. In this paper we publish the optical parameters of several historic telescopes, which we have found in scientific literature or web pages. Data were inputed into the optical program ZEMAX, which evaluated their residual aberrations. Keywords: Achromatic objective lens; spherochromatic aberration; coma; residual chromatic aberration; Index of refraction; dispersion curve of glass Available at various institutes of the ASCR
Optické parametry význačných refraktorů

V tomto referátu publikujeme optické parametry několika historických dalekohledů, které jsme v literatuře a na webových stránkách získali. Data byla vložena do optického programu ZEMAX, v němž byly ...

Rail, Zdeněk; Jareš, Daniel; Pintr, Pavel; Vápenka, David
Ústav fyziky plazmatu, 2017

Vývoj řešení optického řešení Prototypu I
Pintr, Pavel
2017 - Czech
Zpráva popisuje vývoj řešení optické soustavy pro Prototyp I. Jedná se o vývoj kolimátoru laserového záření a vývoj freeform optiky pro tvorbu obdélníkového spotu. This report describes a development of optical solution for the Prototype I. There is a development of laser collimator in the firt part of this report. You can find a development of freeform optics in the second part of this report. Keywords: freeform; laserhead; mirror; NIR Available at various institutes of the ASCR
Vývoj řešení optického řešení Prototypu I

Zpráva popisuje vývoj řešení optické soustavy pro Prototyp I. Jedná se o vývoj kolimátoru laserového záření a vývoj freeform optiky pro tvorbu obdélníkového spotu....

Pintr, Pavel
Ústav fyziky plazmatu, 2017

Material design problems of plasma-chemical reactors for disposal perfluorinated compounds
Brožek, Vlastimil; Březina, Václav; Mastný, L.; Kubatík, Tomáš František; Živný, Oldřich
2017 - English
Reduction of perfluorinated gases emissions from semiconductor industry has recently introduced a serious problem from both technological and economic side. With respect to chemistry of the decomposition reactions the most effective abatement techniques developed up to now consists in the interaction of those gaseous pollutants with several types of plasmas. In the framework of Czech-Taiwanese bilateral project No. 17-10246J 'Decomposition of Perfluorinated Compounds and Fluorinated Ozone Depleting Substances' a new plasmochemical reactor design is to be solved. In this reactor the plasma abatement process consisting of interaction of the plasma generated by unique watter stabilized H-WSP plasma torch at temperatures ranging\nfrom 2000 K up to 25,000 K with the treated gases will be carried out. However, the main product generated in the reactor during the steam plasma abatement process is hydrogen fluoride which causes corrosion of almost every construction material. The aim pursued by the work presented is to search for the materials resistant to exposition of HF even at high temperatures. To investigate corrosion resistance of construction materials with thermal stability within temperature interval 2700-3000 °C titan nitride, boron nitride, and silicon carbide have been selected. The samples of those materials have been prepared by spark plasma sintering method and exposed to concentrated solution of hydrofluoric acid for which corrosion rates have been measured Keywords: perfluorinated compounds; thermal plasma torch; boron nitride; titanium nitride; silicon carbide Available at various institutes of the ASCR
Material design problems of plasma-chemical reactors for disposal perfluorinated compounds

Reduction of perfluorinated gases emissions from semiconductor industry has recently introduced a serious problem from both technological and economic side. With respect to chemistry of the ...

Brožek, Vlastimil; Březina, Václav; Mastný, L.; Kubatík, Tomáš František; Živný, Oldřich
Ústav fyziky plazmatu, 2017

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