Number of found documents: 516
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Infrared measurements in medium and long wavelength on COMPASS
Vondráček, Petr; Horáček, Jan; Pánek, Radomír; Gauthier, E.
2016 - English
The experimental study of radial profiles of parallel heat flux in the scrape-off layer (SOL) of the COMPASS tokamak shows a systematic discrepancy between medium (MWIR) and long (LWIR) wavelength infrared (IR) thermographic measurements. Significant temperature and heat flux overestimation is observed in the MWIR range, whilst the LWIR range is almost not affected. It is assumed to be caused by a presence of dust particles creating sub-pixel sized micro hot-spots. Significant inhomogeneity of the surface conditions across the limiter is observed, resulting in local disturbance of the derived heat flux profiles (decay length variation up to ~ few tens of percent). Influence of the inhomogeneously distributed micro hot-spots is suppressed using correction factors (the heat transmission coefficient α) for each pixel separately in the heat flux calculation. Procedure of the α coefficient estimation is described. Keywords: IR; MWIR; LWIR; Dust; COMPASS; SOL Available at various institutes of the ASCR
Infrared measurements in medium and long wavelength on COMPASS

The experimental study of radial profiles of parallel heat flux in the scrape-off layer (SOL) of the COMPASS tokamak shows a systematic discrepancy between medium (MWIR) and long (LWIR) wavelength ...

Vondráček, Petr; Horáček, Jan; Pánek, Radomír; Gauthier, E.
Ústav fyziky plazmatu, 2016

NEOSTEL Collimator Realization Detailed Optical Design.
Melich, Radek; Steiger, Lukáš; Václavík, Jan; Vít, T.
2016 - English
The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several parts:\n• Optical design and its tolerance analysis\n• Ghost image analysis\n• Stray light analysis\n• Mechanical design and FEM analysis Keywords: Alignment Collimator; NEOSTEL; Optical design Available at various institutes of the ASCR
NEOSTEL Collimator Realization Detailed Optical Design.

The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several ...

Melich, Radek; Steiger, Lukáš; Václavík, Jan; Vít, T.
Ústav fyziky plazmatu, 2016

METIS mirror M0 FM
Lédl, Vít; Melich, Radek; Vít, Tomáš
2016 - English
Scope of the document is to provide required test results with respect to the structure of M0 mirror, FM version. The mirror has a unique numbering M0-C19-22. Keywords: METSI M0 FM mirror Available at various institutes of the ASCR
METIS mirror M0 FM

Scope of the document is to provide required test results with respect to the structure of M0 mirror, FM version. The mirror has a unique numbering M0-C19-22.

Lédl, Vít; Melich, Radek; Vít, Tomáš
Ústav fyziky plazmatu, 2016

COMPARISON OF S-CO2 POWER CYCLES FOR NUCLEAR ENERGY
Veselý, L.; Dostál, V.; Entler, Slavomír
2016 - English
The supercritical carbon dioxide (S-CO2) is a possible cooling system for the new generations of nuclear reactors and fusion reactors. The S-CO2 power cycles have several advantages over other possible coolants such as water and helium. The advantages are the compression work, which is lower than in the case of helium, near the critical point and the S-CO2 is more compact than water and helium. The disadvantage is so called Pinch point which occurs in the regenerative heat exchanger. The pinch point can be eliminated by an arrangement of the cycle or using a mixture of CO2. This paper describes the S-CO2 power cycles for nuclear fission and fusion reactors. Keywords: S-CO2; power cycle; fusion Available at various institutes of the ASCR
COMPARISON OF S-CO2 POWER CYCLES FOR NUCLEAR ENERGY

The supercritical carbon dioxide (S-CO2) is a possible cooling system for the new generations of nuclear reactors and fusion reactors. The S-CO2 power cycles have several advantages over other ...

Veselý, L.; Dostál, V.; Entler, Slavomír
Ústav fyziky plazmatu, 2016

Evolution of Point-To-Plane Nanosecond Discharge in Deionized Water
Šimek, Milan; Pongrác, Branislav; Člupek, Martin; Babický, Václav; Lukeš, Petr
2016 - English
We employed techniques of time-resolved ICCD microscopy and spectroscopy to register basic morphologic and emission fingerprints of micro-discharges produced in deionized water. Fast risetime high-voltage pulses (duration of 5 ns and amplitude of ~110 kV) applied in a point-to-plane electrode geometry produced micro-discharges either periodically or in a single-shot regime. Time resolved ICCD images evidence typical streamer-like branched filamentary morphology while emission spectra show a broad-band continuum evolving during the first few nanoseconds followed by the well-known HI/OI atomic lines (tens of ns). Keywords: nanosecond discharge; water; ICCD imaging Available at various institutes of the ASCR
Evolution of Point-To-Plane Nanosecond Discharge in Deionized Water

We employed techniques of time-resolved ICCD microscopy and spectroscopy to register basic morphologic and emission fingerprints of micro-discharges produced in deionized water. Fast risetime ...

Šimek, Milan; Pongrác, Branislav; Člupek, Martin; Babický, Václav; Lukeš, Petr
Ústav fyziky plazmatu, 2016

Vývoj difuzoru slunečního záření.
Pintr, Pavel
2016 - Czech
Cílem projektu bylo vyrobit prototypy opticky vyhovujících víček pro senzory osvitu a připravit podklady pro výrobu. Na přesnosti čidla osvitu závisí přesnost teoreticky dosažitelné výroby fotovoltaické elektrárny a tím zjišťování její účinnosti a spolehlivosti. V průběhu projektu jsme se potýkali s nepřízní počasí.plánované 2 týdny na měření vyšly na deštivé období a tuto část projektu bylo třeba prodloužit. 1. V souladu s projektem bylo začato detailní analýzou dříve naměřených dat, které jsme dodali zpracovateli. Byla předpokládána příčina vadného chování. 2. Byly navrženo 6 variant optických difuzorů (modifikace víčka stávající krabičky), byla provedena simulace chování difuzoru a byla předána zpráva s protokoly o simulaci v programu Zemax. Výsledky jsem konzultoval se zpracovatelem a protože nebyl zcela jednoznačný kandidát na výsledný prototyp, rozhodli jsme se vyrobit 2 prototypy optických difuzorů. Výstupem byly CAD návrhy difuzoru ve formátu STEP7. Theoretically attainable productions of photovoltaic plants depend on the quality of solar sensors. We can determine an effeciency and reliability of photovoltaic plants with them. We introduce optical simulation of the original solution of solar sensor in software Optic Studio 15.5 Zemax. We propose new diffuser shape of solar sensor according to our analyse. We\ndescribe a development of first prototypes and their testing in the real conditions. Keywords: solar diffuser; optical analyse; pyranometer Available at various institutes of the ASCR
Vývoj difuzoru slunečního záření.

Cílem projektu bylo vyrobit prototypy opticky vyhovujících víček pro senzory osvitu a připravit podklady pro výrobu. Na přesnosti čidla osvitu závisí přesnost teoreticky dosažitelné výroby ...

Pintr, Pavel
Ústav fyziky plazmatu, 2016

Návrh konceptů řešení předsádky pro zařízení OptoNS.
Pintr, Pavel
2016 - Czech
Pro vyhodnocení detailů (tvar Taylorova kuželu) využívá firma Elmarco, a. s., komerční objektiv Nikon AF Nikkor 200 mm f/4D IF-ED. Tento systém je schopen zobrazit scénu v horizontální velikosti 33 mm, případně 23 mm. Nedokáže zachytit potřebný detail. V současné době je řešeno osvětlení pomocí LED čipu na provozním světelném toku 5500 lm a difuzorem. Ke zvýšení ostrosti hran je požadováno kolimované světlo. Pozadí by mělo být co nejvíce homogenní horizontálně (podél strunové elektrody). Osvětlení by mělo být vysoké kvůli potřebě krátkého expozičního času pro monitorování rychlých dějů. The company Elmarco uses a classical commercial objective with a focal length of 200 mm for a detection of shape of Taylor´s cone. This system displays a scene with the horizontal size of 23 mm and doesn´t show a scene with a required detail. The commercial solutions don´t exist for the long working distances of 550 mm. We prepared optical solutions of conversion\nlens and the one solution of a main objective. These optical solutions should fulfill required optical parameters. Keywords: optical design; objective; optimization Available at various institutes of the ASCR
Návrh konceptů řešení předsádky pro zařízení OptoNS.

Pro vyhodnocení detailů (tvar Taylorova kuželu) využívá firma Elmarco, a. s., komerční objektiv Nikon AF Nikkor 200 mm f/4D IF-ED. Tento systém je schopen zobrazit scénu v horizontální velikosti 33 ...

Pintr, Pavel
Ústav fyziky plazmatu, 2016

THE INVESTIGATION OF AN Al7075 ALLOY PREPARED BY SPARK PLASMA SINTERING OF MILLED POWDERS
Molnárová, O.; Málek, P.; Nemeth, G.; Kozlík, J.; Lukáč, František; Chráska, Tomáš; Cinert, Jakub
2016 - English
Atomized powder of an Al7075 alloy was high energy ball milled at room and cryogenic temperatures and compacted by spark plasma sintering (SPS) method. The influence of processing parameters on phase composition and microstructure was studied by X-ray diffraction, light and scanning electron microscopy. The mechanical properties were characterized by microhardness measurements. The atomized powder contained a large volume fraction of intermetallic phases located predominantly in continuous layers separating cells or dendrites in the interior of individual powder particles. Consolidation by SPS destroyed partially this morphology and replaced it by individual particles located at boundaries of original powder particles, at cell boundaries or arranged in chains in previous dendritic regions. High energy milling destroyed most intermetallic particles and enriched the matrix by solute atoms. The high deformation energy introduced into the powder during milling enhanced microhardness up to 220 HV. Consolidation of milled powders by SPS led to the formation of very fine-grained structure with the grain size even below 1 μm and with the fraction of high-angle boundaries about 0.9. Two main types of heterogeneously distributed precipitates were found. The irregularly shaped precipitates with a size about 1 μm seemed to encompass areas with rod like nano-precipitates in most samples. A drop in microhardness to 118HV was observed after SPS, predominantly due to a release of introduced deformation energy. Keywords: Cryo-milling; Spark plasma sintering; Ultrafine-grained materials; Milling Available at various institutes of the ASCR
THE INVESTIGATION OF AN Al7075 ALLOY PREPARED BY SPARK PLASMA SINTERING OF MILLED POWDERS

Atomized powder of an Al7075 alloy was high energy ball milled at room and cryogenic temperatures and compacted by spark plasma sintering (SPS) method. The influence of processing parameters on phase ...

Molnárová, O.; Málek, P.; Nemeth, G.; Kozlík, J.; Lukáč, František; Chráska, Tomáš; Cinert, Jakub
Ústav fyziky plazmatu, 2016

ATMOSPHERIC JET BASED ON SURFACE STREAMER DIELECTRIC BARRIER DISCHARGE
Šimek, Milan; Prukner, Václav
2016 - English
We designed novel axisymmetric atmospheric jet formed by effluents produced by surface streamers suitable for various applications. Filamentary streamers are produced by the amplitude-modulated AC surface dielectric barrier discharge. The SDBD-based jet makes use of the tangential injection of the working gas into a cylindrical chamber that induces a fast vortex flow through the discharge zone and expells excited/ionized/reactive species out of the discharge area through the axial orifice in the form of a jet spinning around its axis. The jet may be easily used to treat surfaces, expose biological samples or even be injected in liquids. Keywords: atmospheric pressure; jet; surface barrier discharge Available at various institutes of the ASCR
ATMOSPHERIC JET BASED ON SURFACE STREAMER DIELECTRIC BARRIER DISCHARGE

We designed novel axisymmetric atmospheric jet formed by effluents produced by surface streamers suitable for various applications. Filamentary streamers are produced by the amplitude-modulated AC ...

Šimek, Milan; Prukner, Václav
Ústav fyziky plazmatu, 2016

Measurement of camera spectral response
Melich, Radek; Václavík, Jan; Žídek, Karel
2016 - English
Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light beam from monochromator will be fed into perpendicular port. Sensor of the camera sensor will be therefore uniformly illuminated by diffused light from monochromator. Proposed FWHM of the monochromator is 15 nm as a trade-off between light intensity provided by monochromator and deformation of spectral characteristic (Picture XY). Diameter of the integrating sphere has to be larger than 100 mm to ensure uniform illumination over sensor area. Keywords: Camera spectral response Available at various institutes of the ASCR
Measurement of camera spectral response

Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light ...

Melich, Radek; Václavík, Jan; Žídek, Karel
Ústav fyziky plazmatu, 2016

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