Number of found documents: 602
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Výzkumná zpráva Projekt MidFree 2. etapa
Beneš, Jiří; Karabyn, Vasyl; Matoušek, Ondřej; Špína, Michal
2018 - Czech
Výzkumná zpráva popisující tvorbu inženýrského modelu k predikci možností potlačení problematických povrchových struktur. Research report describing the creation of an engineering model to predict possibilities of suppressing problematic surface structures. Keywords: vibration analysis; MSF simulation Available at various institutes of the ASCR
Výzkumná zpráva Projekt MidFree 2. etapa

Výzkumná zpráva popisující tvorbu inženýrského modelu k predikci možností potlačení problematických povrchových struktur....

Beneš, Jiří; Karabyn, Vasyl; Matoušek, Ondřej; Špína, Michal
Ústav fyziky plazmatu, 2018

Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
Seidl, Jakub; Jiráková, Kateřina; Adámek, Jiří; Grover, Ondřej; Horáček, Jan; Hron, Martin; Vondráček, Petr
2018 - English
We have identified two distinct types of turbulent fluctuations in COMPASS plasmas, the high-frequency edge oscillations and low-frequency SOL blobs. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of isat fluctuations is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL. This supports, together with turbulence spreading rate being positive in the near SOL but negative in the edge, the picture presented in [3] that most of the fluctuations that form a positive skewness in the edge region disappear around LCFS and new blobs are formed in the near SOL. Further, we cannot confirm the assumption that the blobs are generated randomly according to a Poisson process. Oscillations of all measured quantities, incl. radial particle flux, in the near SOL are peaked around ∼13 kHz. This seems to correspond to a poloidally rotating structure with a rather large poloidal wave-length ∼ 15 − 20 cm, that at least partly modulates blob generation. Nevertheless, we note that time separation of blobs becomes more random further in the SOL, possibly due to differences in their individual propagation. These observations hold for diverted plasmas, but the situation may be different in limited low-elongation plasmas where the radius of zero skewness was observed to be shifted significantly (several cm) inwards, compared to diverted configuration, and Gamma-like PDF is detected even inside the LCFS. Study of these plasmas is ongoing. Keywords: plasma; tokamak; turbulence Fulltext is available at external website.
Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak

We have identified two distinct types of turbulent fluctuations in COMPASS plasmas, the high-frequency edge oscillations and low-frequency SOL blobs. The transition region is localized in the near ...

Seidl, Jakub; Jiráková, Kateřina; Adámek, Jiří; Grover, Ondřej; Horáček, Jan; Hron, Martin; Vondráček, Petr
Ústav fyziky plazmatu, 2018

Využití holografie pro měření a charakterizaci povrchu
Kaván, František
2018 - Czech
Tento výzkum je zaměřen na využití digitální holografie pro měření tvaru optických a jiných ploch. Pro první experimenty jsme použili standardní metodu dvojvlnné holografické interferometrie. Ta posloužila jako reference. Hlavním zaměřením je však Frequency Sweeping Digital Holography (FSDH) neboli skenovací digitální holografie, která využívá plynule přeladitelných DFB laserových diod. Přesnost této metody lze dále vylepšit spojením měření z více vlnových délek - více diod. Při spojení je možno pomocí této metody dosáhnout přesnosti až 2 µm. This research focuses on the use of digital holography for measuring the shape of optical and other surfaces. For the first experiments, we used a standard double-wave holographic interferometry method. This served as a reference. However, the main focus is Frequency Sweeping Digital Holography (FSDH), or scanning digital holography, which utilizes fluently translatable DFB laser diodes. The accuracy of this method can be further improved by combining measurements from multiple wavelengths - multiple diodes. When combined, this method can achieve accuracy of up to 2 μm. Keywords: holography; measurement Fulltext is available at external website.
Využití holografie pro měření a charakterizaci povrchu

Tento výzkum je zaměřen na využití digitální holografie pro měření tvaru optických a jiných ploch. Pro první experimenty jsme použili standardní metodu dvojvlnné holografické interferometrie. Ta ...

Kaván, František
Ústav fyziky plazmatu, 2018

Realizace tenkých vrstev na optických komponentech
Budasz, Jiří
2018 - Czech
Zpráva se zabývá realizací tenkých vrstev na optických elementech určených pro funkční vzorky a prototypy. Popisuje rovněž zátěžové testování soustav vrstev na vzorcích. The report describes the realisation of the thin films coatings at the optical elements used for prototyping. It involves the testing of the coatings at sample substrates as well. Keywords: High reflective coatings; testing; laser Available at various institutes of the ASCR
Realizace tenkých vrstev na optických komponentech

Zpráva se zabývá realizací tenkých vrstev na optických elementech určených pro funkční vzorky a prototypy. Popisuje rovněž zátěžové testování soustav vrstev na vzorcích....

Budasz, Jiří
Ústav fyziky plazmatu, 2018

Effect of sintering temperature on microstructure and mechanical properties of AE42 magnesium alloy prepared by spark plasma sintering
Minárik, P.; Lukáč, František; Cinert, Jakub; Šašek, S.; Král, R.
2018 - English
Magnesium alloy AE42 was prepared by powder metallurgy technique of spark plasma sintering. The effect of sintering parameters, particularly sintering temperature, on the microstructure and mechanical strength was investigated. The gas-atomized powder was sintered at four temperatures in the temperature range of 400-550 °C. It was found that mechanical strength of the sintered samples was significantly affected by several microstructural features. Application of relatively high load during sintering caused deformation of the individual particles and consequent recrystallization depending on the processing temperature resulted in the release of internal strain and in grain growth. As a result, the evolution of the mechanical strength as a function of the sintering temperature was significantly affected by residual stress, grain size and coarsening of secondary phase particles. Keywords: Magnesium; Mechanical properties; Microstructure; Spark plasma sintering Available at various institutes of the ASCR
Effect of sintering temperature on microstructure and mechanical properties of AE42 magnesium alloy prepared by spark plasma sintering

Magnesium alloy AE42 was prepared by powder metallurgy technique of spark plasma sintering. The effect of sintering parameters, particularly sintering temperature, on the microstructure and mechanical ...

Minárik, P.; Lukáč, František; Cinert, Jakub; Šašek, S.; Král, R.
Ústav fyziky plazmatu, 2018

OLGA – efficient full wave code for the coupling of LH grills
Preinhaelter, Josef; Hillairet, J.; Urban, Jakub
2018 - English
The full wave code OLGA, for determining the coupling of a single row lower hybrid launcher (waveguide grills) to the plasma, is extended to handle multirow multijunction active passive structures (like the C3 and C4 launchers on TORE SUPRA) by implementing the scattering matrix formalism. The extended code is still computationally fast because of the use of (i) 2D splines of the plasma surface admittance in the accessibility region of the k-space, (ii) high order Gaussian quadrature rules for the integration of the coupling elements and (iii) utilizing the symmetries of the coupling elements in the multiperiodic structures. The extended OLGA code is benchmarked against the ALOHA-1D, ALOHA-2D and TOPLHA codes for the coupling of the C3 and C4 TORE SUPRA launchers for several plasma configurations derived from reflectometry and interferometery. Unlike nearly all codes (except the ALOHA-1D code), OLGA does not require large computational resources and can be used for everyday usage in planning experimental runs. In particular, it is shown that the OLGA code correctly handles the coupling of the C3 and C4 launchers over a very wide range of plasma densities in front of the grill. Keywords: lower hybrid waves; coupling; large multirow multijunction grills; tokamak; full-wave Fulltext is available at external website.
OLGA – efficient full wave code for the coupling of LH grills

The full wave code OLGA, for determining the coupling of a single row lower hybrid launcher (waveguide grills) to the plasma, is extended to handle multirow multijunction active passive structures ...

Preinhaelter, Josef; Hillairet, J.; Urban, Jakub
Ústav fyziky plazmatu, 2018

Collimator - test readiness review
Budasz, Jiří; Kaván, František; Kredba, Jan; Lédl, Vít; Mach, Marek; Pleštil, Jan; Psota, Pavel; Steiger, Lukáš; Tomka, David; Václavík, Jan; Veselý, Martin
2018 - English
This document describes the test procedure applicable to the overall functional test of the NEOSTED collimator.\nThe test to be performed according to this procedure are to demonstrate the compliance of the above item to the requirements specified in the applicable document as part of the overall verification program. The test results shall be collected in a Test Report. Keywords: collimator; PLC system; telescope; interferometry Available at various institutes of the ASCR
Collimator - test readiness review

This document describes the test procedure applicable to the overall functional test of the NEOSTED collimator.\nThe test to be performed according to this procedure are to demonstrate the compliance ...

Budasz, Jiří; Kaván, František; Kredba, Jan; Lédl, Vít; Mach, Marek; Pleštil, Jan; Psota, Pavel; Steiger, Lukáš; Tomka, David; Václavík, Jan; Veselý, Martin
Ústav fyziky plazmatu, 2018

Technical manual - neosted SOT test bench
Steiger, Lukáš
2018 - English
The purpose of this document is to provide basic set of rules and instructions that allows using and maintaining of the NEOSTED SOT test bench (BB).\nFurther detailed informations and proper references about individual parts of the BB system can be found in [AD-2, AD-3]. Keywords: test bench; optical testing; collimator; neosted Available at various institutes of the ASCR
Technical manual - neosted SOT test bench

The purpose of this document is to provide basic set of rules and instructions that allows using and maintaining of the NEOSTED SOT test bench (BB).\nFurther detailed informations and proper ...

Steiger, Lukáš
Ústav fyziky plazmatu, 2018

Vývoj procesu mytí a příprava povrchu před depozicí
Budasz, Jiří
2018 - Czech
Zpráva popisuje vývoj mycího postupu substrátů pro výrobu superodrazných zrcadel. Zahrnuje také vývoj procesu ošetření povrchu ve vakuu. The report deals with a development of cleaning precedure of substrates used for producing high reflective mirrors. It involves pre-deposition treatment of the surface in vacuum chamber. Keywords: High reflective coatings; cleaning; pre-deposition treatment Available at various institutes of the ASCR
Vývoj procesu mytí a příprava povrchu před depozicí

Zpráva popisuje vývoj mycího postupu substrátů pro výrobu superodrazných zrcadel. Zahrnuje také vývoj procesu ošetření povrchu ve vakuu....

Budasz, Jiří
Ústav fyziky plazmatu, 2018

Electric probe measurements in the anode area of a DC arc plasma torch at low pressure
Ondáč, Peter; Mašláni, Alan; Hrabovský, Milan
2018 - English
We measured radial profiles of the electric field, plasma electrical potential and electron temperature in the hot anode area of a hybrid water-argon DC arc plasma torch with an external anode. The measurements were made under different values of the ambient pressure, during the restrike mode with a constricted anode arc attachment or during a supersonic mode with a diffuse anode arc attachment. The results provide first experimental data on plasma electrical potential in that anode area. Keywords: plasma; arc; anode; low pressure; electric probes Available at various institutes of the ASCR
Electric probe measurements in the anode area of a DC arc plasma torch at low pressure

We measured radial profiles of the electric field, plasma electrical potential and electron temperature in the hot anode area of a hybrid water-argon DC arc plasma torch with an external anode. The ...

Ondáč, Peter; Mašláni, Alan; Hrabovský, Milan
Ústav fyziky plazmatu, 2018

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