Yes (60)
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Korektor komy D. M. Maksutova
Rail, Zdeněk; Jareš, Daniel; Vápenka, David
2015 - Czech
Nejjednodušším korektorem komy paraboloidického zrcadla je jednočočkový meniskový korektor Maksutova. Tento korektor, umístěný do sbíhavého svazku paraboloidu, opravuje komu a zároveň zachovává stigmatičnost systému na optické ose. Je snadno vyrobitelný a zvětšuje zorné pole paraboloidu třikrát. The simpliest coma corrector of the paraboloidal mirror is a singlet-meniscus of Maksutov. This corrector placed into converging beam of a paraboloidal mirror corrects coma and saves stigmatic image of the system on its optical axis. The corrector can be easily to built and enlarges the field of view about three times.
Keywords:
Paraboloidal mirror; Coma corrector; Seydel sums; Abbe Sine Condition; Aplanatic system
Fulltext is available at external website.
Korektor komy D. M. Maksutova
Nejjednodušším korektorem komy paraboloidického zrcadla je jednočočkový meniskový korektor Maksutova. Tento korektor, umístěný do sbíhavého svazku paraboloidu, opravuje komu a zároveň zachovává ...
Fyzikálně astronomické úvahy
Oupický, Pavel
2015 - Czech
Referát je zaměřen na problematické oblasti fyziky a fyzikálně astronomické úvahy The paper is oriented on the problem parts of physic and astronomy physical
Keywords:
Radiation; antimatter; gravitation; atoms; neutrinos; big bang etc
Fulltext is available at external website.
Fyzikálně astronomické úvahy
Referát je zaměřen na problematické oblasti fyziky a fyzikálně astronomické úvahy
The paper is oriented on the problem parts of physic and astronomy physical
Poisson Equation Solver Parallelisation for Particle-in-Cell Model
Podolník, Aleš; Komm, Michael; Dejarnac, Renaud; Gunn, J. P.
2014 - English
Numerical simulations based on PIC technique like the SPICE2 model developed at IPP ASCR are often used in tokamak plasma physics to investigate the interaction of edge plasma with plasma-facing components. The SPICE2 model has been parallelised with the exception of the Poisson equation solver which considerably slows down the simulations. It is now being upgraded to a parallelised version to be efficient enough to perform more demanding tasks like the ITER tokamak baseline scenario edge plasma whose conditions like high density (up to 1020 m−3) and low temperature (1–2 eV) result in simulations taking several months to compute. Performance and scaling are compared for different cases in order to choose the optimal candidate for aforementioned applications.
Keywords:
plasma; tokamak; ITER
Fulltext is available at external website.
Poisson Equation Solver Parallelisation for Particle-in-Cell Model
Numerical simulations based on PIC technique like the SPICE2 model developed at IPP ASCR are often used in tokamak plasma physics to investigate the interaction of edge plasma with plasma-facing ...
Thermal Coatings for Glass Industry
Chráska, Pavel; Neufuss, Karel
2014 - English
A new type of plasma torch with combined stabilization of electric arc by water vortex and gas flow is presented. This hybrid water/gas stabilization offers the possibility of adjusting plasma jet parameters within a wide range from high-enthalpy low-density plasmas typical for liquid stabilized torches to lower enthalpy higher density plasmas generated in gas stabilized torches. Moreover, gas flow in the cathode part protects a cathode tip and thus a consumable graphite cathode used in water-only stabilized plasma torches could be replaced by a fixed tungsten cathode. Examples of hybrid WSP torch utilization for high temperature application are given.
Keywords:
glass melts; high temperature loading; glass forming tools; service life; coatings
Fulltext is available at external website.
Thermal Coatings for Glass Industry
A new type of plasma torch with combined stabilization of electric arc by water vortex and gas flow is presented. This hybrid water/gas stabilization offers the possibility of adjusting plasma jet ...
THERMAL AND MECHANICAL PROPERTIES OF TUNGSTEN COMPACTS PREPARED BY SPS
Nevrlá, Barbara; Vilémová, Monika; Matějíček, Jiří
2014 - English
Tungsten is a promising candidate material for use in the tokamak device aimed at future production of nuclear fusion power. Here, tungsten is intended for the application in the part called first wall,with the function of a heat-resistant plasma facing armor.In the present work,two fractions of tungsten powder (2 and 4 μm) were used to prepare two consolidated samples by spark plasma sintering (SPS),using a combination of pressure,temperature and electric power.This sintering technique produces samples of near theoretical density which is positive for the application.Tungsten compacts were then studied to determine some basic thermal and mechanical properties, namely thermal conductivity using the laser-flash method and hardness by Vickers test.The measurements were focused on thermal conductivity of the compacts because high thermal conductivity is crucial for the material of tokamak first wall,loaded by high heat flux from the plasma.High hardness is desirable for good resistance
Keywords:
spark plasma sintering; tungsten; thermal properties
Fulltext is available at external website.
THERMAL AND MECHANICAL PROPERTIES OF TUNGSTEN COMPACTS PREPARED BY SPS
Tungsten is a promising candidate material for use in the tokamak device aimed at future production of nuclear fusion power. Here, tungsten is intended for the application in the part called first ...
Study of Alfven Eigenmodes in Tokamak COMPASS
Markovič, Tomáš; Stöckel, Jan; Seidl, Jakub; Melnikov, A.; Medvedev, S.
2014 - English
Having both MHD and kinetic character plasma Alfven eigenmodes are signicant not only on the eld basic plasma research, but also on the eld of magnetic connement fusion. An introduction to basic physical principles of Alfven eigenmodes under MHD approximation is provided. Presented results of recent experiments on COMPASS suggest occurrence of toroidal Alfven eigenmodes in this tokamak, which is further supported by preliminary linear MHD code simulations, althought more studies will have to be conducted in the future to further investigate presented modes therein.
Keywords:
Alfven eigenmodes; tokamak; COMPASS
Fulltext is available at external website.
Study of Alfven Eigenmodes in Tokamak COMPASS
Having both MHD and kinetic character plasma Alfven eigenmodes are signicant not only on the eld basic plasma research, but also on the eld of magnetic connement fusion. An introduction to basic ...
Plasma Boundary Reconstruction using Fast Camera on the COMPASS Tokamak
Háček, Pavel; Berta, Miklós; Stöckel, Jan; Weinzettl, Vladimír; Budai, C.; Szabolics, T.; Bencze, A.
2014 - English
Determination of the plasma boundary is an important task for safe operation of the tokamak and diagnostic systems as well as for correct interpretation of the measured data. Magnetic reconstruction codes routinely used to determine the shape of the plasma have a number of limitations which can make the reconstruction problematic. Recently, it has been demonstrated on several devices that it is possible to provide independent measurement of the plasma boundary by observation of the visiblelight emission using fast framing cameras. In the presented work, a single fast camera on the COMPASS tokamak was used for reconstruction of the optical plasma boundary, assuming a toroidally symmetric visible-light emission profile located in the edge of plasma. As a first result, application of the method on D-shaped COMPASS shot 7145 and its comparison with magnetic reconstruction from the EFIT code is given. Both methods show good agreement with average difference 0.5 cm.
Keywords:
plasma; tokamak; COMPASS
Fulltext is available at external website.
Plasma Boundary Reconstruction using Fast Camera on the COMPASS Tokamak
Determination of the plasma boundary is an important task for safe operation of the tokamak and diagnostic systems as well as for correct interpretation of the measured data. Magnetic reconstruction ...
On the Character of the Motion of Runaway Electrons in a Time Dependent Magnetic Field from 3D MHD Code JOREK
Papřok, Richard; Krlín, Ladislav
2014 - English
In our paper we describe our new particle tracking code and we present results of our simulations of trajectories of runaway electrons in a time dependent magnetic feld computed by non-linear 3D MHD code JOREK for the case of pellet injection on Tore Supra tokamak. We show that the character of the resulting motion is not a simple difusion process but rather a sum of a stable motion on the same radius and phases of rapid changes of radial position.
Keywords:
magnetic field; tokamak; plasma
Fulltext is available at external website.
On the Character of the Motion of Runaway Electrons in a Time Dependent Magnetic Field from 3D MHD Code JOREK
In our paper we describe our new particle tracking code and we present results of our simulations of trajectories of runaway electrons in a time dependent magnetic feld computed by non-linear 3D MHD ...
Properties of Novel Hybrid Water-Gas DC Arc Plasma Torch
Chráska, Tomáš; Hrabovský, Milan; Glanc, Aleš; Mušálek, Radek; Medřický, Jan
2014 - English
A new type of plasma torch with combined stabilization of electric arc by water vortex and gas flow is presented. This hybrid water/gas stabilization offers the possibility of adjusting plasma jet parameters within a wide range from high-enthalpy low-density plasmas typical for liquid stabilized torches to lower enthalpy higher density plasmas generated in gas stabilized torches. Moreover, gas flow in the cathode part protects a cathode tip and thus a consumable graphite cathode used in water-only stabilized plasma torches could be replaced by a fixed tungsten cathode. Examples of hybrid WSP torch utilization for high temperature application are given.
Keywords:
Water-Gas; Plasma Torch
Fulltext is available at external website.
Properties of Novel Hybrid Water-Gas DC Arc Plasma Torch
A new type of plasma torch with combined stabilization of electric arc by water vortex and gas flow is presented. This hybrid water/gas stabilization offers the possibility of adjusting plasma jet ...
Electric Probe Diagnostic of Supersonic Thermal Plasma Jet
Hurba, Oleksiy; Hrabovský, Milan
2014 - English
This paper describes how electric probes can be used as relatively simple and efficient tool for investigation of structure of flow field in thermal plasma jet at the low pressure. A boundary of plasma jet between nozzle of plasma torch and ambient air was investigated by means of array of moving electric probes. Were defined boundaries of the conducting region and their change with pressure change
Keywords:
thermal plasma; electric probes
Fulltext is available at external website.
Electric Probe Diagnostic of Supersonic Thermal Plasma Jet
This paper describes how electric probes can be used as relatively simple and efficient tool for investigation of structure of flow field in thermal plasma jet at the low pressure. A boundary of ...
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