Number of found documents: 539
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Investigation of nanosecond pulsed corona-like discharge generated in deionized water.
Pongrác, Branislav; Šimek, Milan; Babický, Václav; Člupek, Martin; Lukeš, Petr
2017 - 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. Keywords: Underwater discharge; nanosecond pulsed discharge; time-resolved emission spectroscopy; time-resolved ICCD imaging Available at various institutes of the ASCR
Investigation of nanosecond pulsed corona-like discharge generated 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.

Pongrác, Branislav; Šimek, Milan; Babický, Václav; Člupek, Martin; Lukeš, Petr
Ústav fyziky plazmatu, 2017

ADHESION OF BIOCOMPATIBLE TiNb COATING
Kolegar, T.; Matoušek, M.; Vilémová, Monika; Starý, V.
2017 - English
Preparation of a coating with a high quality requires good adhesion of the film to the substrate. The paper deals with the adhesion of biocompatible TiNb coating with different base materials. Several materials such as titanium CP grade 2, titanium alloys Ti6Al4V and stainless steel AISI 316L were measured. Testing samples were made in the shape of small discs. Those samples were coated with a TiNb layer by using the PVD method (magnetron sputtering). Onto the measured layer of TiNb an assistant cylinder was stuck using a high strength epoxy adhesive E1100S. The sample with the assistant cylinder was fixed into a special fixture and the whole assembly underwent pull-off testing for adhesion. The main result of this experiment was determining the strength needed to peel the layer and morphology and size of the breakaway. As a result, we will be able to determine the best base material and conditions where the coating will be remain intact with the base material. Keywords: PVD coating; Adhesion; Biocompatible materials; Pull-off test; Titanium; Niobium Available at various institutes of the ASCR
ADHESION OF BIOCOMPATIBLE TiNb COATING

Preparation of a coating with a high quality requires good adhesion of the film to the substrate. The paper deals with the adhesion of biocompatible TiNb coating with different base materials. Several ...

Kolegar, T.; Matoušek, M.; Vilémová, Monika; Starý, V.
Ústav fyziky plazmatu, 2017

Nanosecond discharge in deionized water: morphology, propagation velocity and optical emission during initial phase.
Šimek, Milan; Pongrác, Branislav; Babický, Václav; Člupek, Martin; Lukeš, Petr
2017 - English
In this work, we have explored micro-discharges produced in deionized liquid water by applying fast-rising positive HV pulses of nanosecond duration (pulses of ~80 kV in amplitude and of 5 ns in duration, either with the repetition rate of 1 Hz or in a single-shot regime) in a point-to-plane electrode geometry. Keywords: Underwater discharge; nanosecond pulsed discharge; time-resolved emission spectroscopy; time-resolved ICCD imaging Available at various institutes of the ASCR
Nanosecond discharge in deionized water: morphology, propagation velocity and optical emission during initial phase.

In this work, we have explored micro-discharges produced in deionized liquid water by applying fast-rising positive HV pulses of nanosecond duration (pulses of ~80 kV in amplitude and of 5 ns in ...

Šimek, Milan; Pongrác, Branislav; Babický, Václav; Člupek, Martin; Lukeš, Petr
Ústav fyziky plazmatu, 2017

Reflectivity of a mirror in XUV spectral region (46.9 nm).
Schmidt, Jiří; Koláček, Karel; Štraus, Jaroslav; Frolov, Oleksandr; Prukner, Václav; Melich, Radek; Psota, Pavel; Sobota, Jaroslav; Fořt, Tomáš
2017 - English
A focusing mirror as an optical element is used in our applications that require light collection (e.g. for laser ablation studies). A knowledge of the mirror reflectivity is important for determination of focused laser pulse energy, or for determination of local fluencies near the laser focus. The reflectivity of our spherical focusing mirror with(/without) multi-layer coating was measured. Reflection coefficients of this mirror in a long period of time are also reported. Further, the incidence-angle dependence of the XUV reflectivity of flat mirrors is presented as well. Keywords: Reflectivity of multilayer mirror in XUV range; aging of multilayer mirrors Available at various institutes of the ASCR
Reflectivity of a mirror in XUV spectral region (46.9 nm).

A focusing mirror as an optical element is used in our applications that require light collection (e.g. for laser ablation studies). A knowledge of the mirror reflectivity is important for ...

Schmidt, Jiří; Koláček, Karel; Štraus, Jaroslav; Frolov, Oleksandr; Prukner, Václav; Melich, Radek; Psota, Pavel; Sobota, Jaroslav; Fořt, Tomáš
Ústav fyziky plazmatu, 2017

Preparation of spheroidized and nano-structural spinels by the SPPS method
Brožek, Vlastimil; Lukáč, František; Medřický, Jan; Mušálek, Radek; Mašláni, Alan; Mastný, L.; Brodil, R.
2017 - English
Solution Precursor Plasma Spraying (SPPS) method, using hybrid water-stabilised plasma torch (WSP®-H), is presented in this study. Precursor, in a form of a solution of inorganic salts, is injected into the plasma jet, where the temperature can reach up to 25 000 K and a series of reactions lead to the formation of spherical sub-micrometric sized particles. The complete process of evaporating the liquid, crystallization, thermic decomposition, melting and recrystallization takes place in few milliseconds before the particles solidify. Melted nanoparticles can be either directly collected in order to obtain ultrafine powders or deposited onto a substrate to form micro-splats and continuous polycrystalline, and often partially amorphous, coatings. The possibility of continuous and discontinuous changes of stoichiometric composition in tetrahedral and octahedral configurations were analysed for the deposits of MgAl2O4, CoAl2O4 and CoFe2O4 spinels. Furthermore, thin colourful coatings of ruby and modified cobalt oxides were deposited onto ceramic and metallic substrates. Keywords: Solution plasma spraying; suspension plasma spraying; spinels; ferrites; ruby; nanoparticles Available at various institutes of the ASCR
Preparation of spheroidized and nano-structural spinels by the SPPS method

Solution Precursor Plasma Spraying (SPPS) method, using hybrid water-stabilised plasma torch (WSP®-H), is presented in this study. Precursor, in a form of a solution of inorganic salts, is injected ...

Brožek, Vlastimil; Lukáč, František; Medřický, Jan; Mušálek, Radek; Mašláni, Alan; Mastný, L.; Brodil, R.
Ústav fyziky plazmatu, 2017

Maksutovovy soustavy z Turnova
Rail, Zdeněk; Melich, Zbyněk; Jareš, Daniel; Pintr, Pavel; Vápenka, David
2017 - Czech
Tento referát popisuje vývoj a výrobu optických soustav, u kterých byl použit meniskový korektor Maksutova jako vstupní člen. Řada těchto vysoce kvalitních systémů byla v Turnově vyráběna od sedmdesátých let na několika pracovištích. V naší práci presentujeme zkušenosti s optickým designem, výrobou a konstrukcí meniskových dalekohledů a komor. This paper deals of a design and a manufacture of optical systems with the entrance meniscus corrector of Maksutov. Many of these high performance systems have been manufactured in several workshops in Turnov since Seventies. We present our experience with the optical design, manufacture and construction of the meniscus telescopes and cameras in this article. Keywords: Catadioptric system; meniscus corrector; spherochromatic aberration; spherical aberration; coma; astigmatism; Petzval´s curvature; MTF curve; glass dispersion curve Available at various institutes of the ASCR
Maksutovovy soustavy z Turnova

Tento referát popisuje vývoj a výrobu optických soustav, u kterých byl použit meniskový korektor Maksutova jako vstupní člen. Řada těchto vysoce kvalitních systémů byla v Turnově vyráběna od ...

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

Double pulse capillary discharge assessment for nitrogen soft X-ray laser.
Hübner, Jakub; Nevrkla, M.
2017 - English
The work examines possibilities of capillary discharge pinching plasma driven by combination of two electric current pulses ("pedestal" slow exponentially damped sinus t1/4 > 200 ns, peak current Ipeak < 50 kA and fast triangular pulse with a rise time about 38 ns, Ipeak > 60 kA) to obtain the maximum possible gain at wavelength l = 13.4 nm (hydrogen-like nitrogen recombination scheme). The optimal initial density ρ0 (or pressure) and start time tstart of second triangular pulse (second pulse start at peak current Ipeak of the first pulse) were determined for two capillary radii (0.5 and 1 cm) and four current peaks of the first pulse (20, 30, 40 and 50 kA).\n Keywords: capillary discharge; XUV laser; pinch dynamics; nitrogen recombination schema; ablation Available at various institutes of the ASCR
Double pulse capillary discharge assessment for nitrogen soft X-ray laser.

The work examines possibilities of capillary discharge pinching plasma driven by combination of two electric current pulses ("pedestal" slow exponentially damped sinus t1/4 > 200 ns, peak current ...

Hübner, Jakub; Nevrkla, M.
Ústav fyziky plazmatu, 2017

XUV Spectra from High Current Nitrogen Z-Pinch Capillary Discharge.
Vrba, Pavel; Vrbová, M.
2017 - English
We have performed computer modeling of the pinching plasma of capillary discharge using the 1d NPINCH code, that considers ablation of the capillary wall. At high currents we have observed that, the ablation has significant effect on the plasma electron temperature evolution and on the rate of pinch decay. To estimate the emitted spectra in XUV range, the FLYCHK code was used as a post processor. The capillary wall ablation represents the principal obstacles of recombination pumping during pinch decay.\n Keywords: MHD and RMHD simulations of high current capillary discharge; Z-pinches; water window radiation; capillary wall ablation Available at various institutes of the ASCR
XUV Spectra from High Current Nitrogen Z-Pinch Capillary Discharge.

We have performed computer modeling of the pinching plasma of capillary discharge using the 1d NPINCH code, that considers ablation of the capillary wall. At high currents we have observed that, the ...

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

Microwave reflectometry for density profile and turbulence measurements on the COMPASS tokamak.
Bogár, Ondrej; Bílková, Petra; Böhm, Petr; Hron, Martin; Pánek, Radomír; Silva, A.; Zajac, Jaromír; Varavin, Mykyta
2017 - English
Microwave reflectometry is an established radar technique to acquire various scientific results in plasma fusion research. Fast electron density profile measurements are crucial for the study of fusion plasmas and the operation of fusion devices. Operation capability and first results of the reflectometry on the COMPASS tokamak are presented in this contribution. Keywords: plasma; tokamak; COMPASS Fulltext is available at external website.
Microwave reflectometry for density profile and turbulence measurements on the COMPASS tokamak.

Microwave reflectometry is an established radar technique to acquire various scientific results in plasma fusion research. Fast electron density profile measurements are crucial for the study of ...

Bogár, Ondrej; Bílková, Petra; Böhm, Petr; Hron, Martin; Pánek, Radomír; Silva, A.; Zajac, Jaromír; Varavin, Mykyta
Ústav fyziky plazmatu, 2017

Evaluation of selected parameters of a LIBA2000 glass melt according to ISO 12123.
Václavík, Jan
2016 - English
Measurement of refractive indices of samples, specifically refractive indicies nd, ne and Abbe numbers for spectral lines d and e. Assesment of refractive index variation, internal spectal transmitance and amount of striae in samples.\n Keywords: glass melt; ISO 12123; striae; refractive index; inhomogeneity Available at various institutes of the ASCR
Evaluation of selected parameters of a LIBA2000 glass melt according to ISO 12123.

Measurement of refractive indices of samples, specifically refractive indicies nd, ne and Abbe numbers for spectral lines d and e. Assesment of refractive index variation, internal spectal ...

Václavík, Jan
Ústav fyziky plazmatu, 2016

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