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Electric Probe Diagnostic of Supersonic Thermal Plasma Jet
Hurba, Oleksiy; Hrabovský, Milan
2014 - anglický
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
Klíčová slova:
thermal plasma; electric probes
Dokument je dostupný na externích webových stránkách.
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 ...
Parallel Heat Flux Decay Length Study in the COMPASS Tokamak Using MWIR and LWIR Cameras
Vondráček, Petr; Horáček, Jan; Pánek, Radomír; Gauthier, E.
2014 - anglický
A comprehensive study of a parallel heat flux in a tokamak scrape-off layer (SOL) has been performed in the COMPASS tokamak recently. Specially shaped high field side (HFS) limiter was used to estimate a heat flux radial decay length for small limiter radial misalignment. Long wavelength IR microbolometer and medium wavelength IR InSb camera were used for this purpose. This paper compares results obtained by the means of both cameras and demonstrates observation of very narrow heat flux decay length close to the last closed flux surface (LCFS) independantly on used camera.
Klíčová slova:
Plasma diagnostics; infrared thermography; infrared camera; tokamak; near SOL
Dokument je dostupný na externích webových stránkách.
Parallel Heat Flux Decay Length Study in the COMPASS Tokamak Using MWIR and LWIR Cameras
A comprehensive study of a parallel heat flux in a tokamak scrape-off layer (SOL) has been performed in the COMPASS tokamak recently. Specially shaped high field side (HFS) limiter was used to ...
Properties of Filamentary Structures in Different Regimes of Plasma Confinement on the COMPASS Tokamak
Kovařík, Karel; Ďuran, Ivan; Stöckel, Jan; Adámek, Jiří; Spolaore, M.; Vianello, N.
2014 - anglický
A complex electrostatic-magnetic probe diagnostic, called U-probe, has been installed on the tokamak COMPASS recently. Probe composes of two identical towers. Each tower houses radialy separated 3 sets of 3D coils, a triple probe and a rake of six single Langmuir probes. We present measurements of electric and magnetic properties of the filamentary structures in the scrape off layer plasmas during different regimes of plasma confinement on COMPASS tokamak
Klíčová slova:
U-probe; tokamak; COMPASS; plasma; Langmuir probes
Dokument je dostupný na externích webových stránkách.
Properties of Filamentary Structures in Different Regimes of Plasma Confinement on the COMPASS Tokamak
A complex electrostatic-magnetic probe diagnostic, called U-probe, has been installed on the tokamak COMPASS recently. Probe composes of two identical towers. Each tower houses radialy separated 3 ...
The Absolute Sensitivity Measurements of Spectra in Near IR Range at the COMPASS Tokamak
Naydenkova, Diana; Stöckel, Jan; Weinzettl, Vladimír
2014 - anglický
The new impurity survey spectrometer HR 2000+ is used for registration of the most intense spectral lines in the 654–1085 nm near IR range with spectral resolution 0.23 nm and temporal resolution from 4 ms to discharge duration at the COMPASS tokamak. The procedure of the absolute calibration of the spectrometer is described and technical issues and experimental limitations connected with its operation are discussed here. The measured spectra are interpreted and results are discussed.
Klíčová slova:
tokamak; COMPASS; spectrometer HR 2000+
Dokument je dostupný na externích webových stránkách.
The Absolute Sensitivity Measurements of Spectra in Near IR Range at the COMPASS Tokamak
The new impurity survey spectrometer HR 2000+ is used for registration of the most intense spectral lines in the 654–1085 nm near IR range with spectral resolution 0.23 nm and temporal resolution ...
Analysis and synthesis of optical performance of given material
Kovačičinová, Jana; Pintr, Pavel
2014 - anglický
Development of measurement process of optical performance of given material
Klíčová slova:
measurement; optical performance
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Analysis and synthesis of optical performance of given material
Development of measurement process of optical performance of given material
Infrared Thermography on the COMPASS Tokamak
Vondráček, Petr; Horáček, Jan; Cahyna, Pavel; Pánek, Radomír; Uličný, J.
2013 - anglický
This contribution describes a new slow infrared camera obtained by the COMPASS tokamak at IPP Prague. We focus on the camera limitations affecting the experimental data (temporal and spatial smoothing, time shift). Data time deconvolution used to correct the effect of the long response time of the camera detector is described. The second part of the contribution is devoted to the physic basis for the design of a new fast IR camera system planned for installation in COMPASS during the next year.
Klíčová slova:
Plasma diagnostics; infrared camera; tokamak
Dokument je dostupný na externích webových stránkách.
Infrared Thermography on the COMPASS Tokamak
This contribution describes a new slow infrared camera obtained by the COMPASS tokamak at IPP Prague. We focus on the camera limitations affecting the experimental data (temporal and spatial ...
METIS – Design report - mirrors
Lédl, Vít; Melich, Radek; Psota, Pavel; Steiger, Lukáš; Vít, Tomáš; Kovačičinová, Jana
2013 - anglický
The presented study shows results from the mechanical design of M1 and M2 mirrors for METIS/ICOR. The study compares the material properties of different materials, which are often used for manufacturing of
Klíčová slova:
METIS; lightweighted mirrors; low microroughness
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
METIS – Design report - mirrors
The presented study shows results from the mechanical design of M1 and M2 mirrors for METIS/ICOR. The study compares the material properties of different materials, which are often used for ...
New Detection System for Fast Density Measurements Using the Lithium Beam on the COMPASS Tokamak
Háček, Pavel; Berta, M.; Stöckel, Jan; Weinzettl, Vladimír; Anda, G.; Bencze, A.; Zoletnik, S.
2013 - anglický
The lithium beam diagnostic at COMPASS is designed for measurements of the edge plasma density profile and fluctuations and edge plasma current fluctuations. The principle of the diagnostic is detection of light coming from collisionally excited Li atoms — beam emission spectroscopy (BES) - and a direct detection of the ionized part of the beam (atomic beam probe — ABP). For slow density measurements a charged coupled device (CCD) camera has been installed and is already working. For fast twodimensional density profile and density fluctuation measurements an array of avalanche photodiode detectors (APDs) will be used. The two-dimensional resolution of the measurement will be possible using fast poloidal deflection and chopping of the beam. Apart from routine density profile measurement, the diagnostic will be capable of investigating the turbulent structures in the edge plasma by cross-correlating the signals coming from poloidally deflected virtual beams.
Klíčová slova:
Diagnostic lithium beam; Plasma diagnostics; tokamak
Dokument je dostupný na externích webových stránkách.
New Detection System for Fast Density Measurements Using the Lithium Beam on the COMPASS Tokamak
The lithium beam diagnostic at COMPASS is designed for measurements of the edge plasma density profile and fluctuations and edge plasma current fluctuations. The principle of the diagnostic is ...
Planar acoustic metamaterials with the active control of acoustic impedance using a piezoelectric composite actuator
Nováková, Kateřina; Mokrý, P.; Václavík, J.; Marton, P.; Cernik, M.; Psota, Pavel; Doleček, Roman; Lédl, Vít
2013 - anglický
In the Paper, there are presented methods for a precise active control of the acoustic impedance of large planar structures, e.g glass plates or shells, by means of distributed flexible piezoelectric composite actuators which are connected to passive or active electronic shunt circuits. Design of tunable acoustic metamaterials is realized using Finite Element Method simulations and their acoustic properties are evaluated using acoustic transmission loss measurements. Static and dynamic displacements of the metamaterials produced by electric voltage are measured using Digital Holographic Interferometry. We believe that deep understanding of presented systems should result in future applications that improve the quality of everyday life.
Klíčová slova:
Planar acoustic metamaterials; Active control of acoustic impedance; Piezoelectric composite actuator
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Planar acoustic metamaterials with the active control of acoustic impedance using a piezoelectric composite actuator
In the Paper, there are presented methods for a precise active control of the acoustic impedance of large planar structures, e.g glass plates or shells, by means of distributed flexible piezoelectric ...
Design and Preliminary Results of the COMPASS Power Supplies Filters
Havlíček, Josef; Zajac, Jaromír
2013 - anglický
The COMPASS tokamak uses rectifying thyristor converters as Power Supplies for the major slow coils circuits. 24-pulse thyristor converter is used for Toroidal Field circuit and 12-pulse converters are used for Magnetizing, Equilibrium and Shaping Field circuits. A noise generated by the switching of the converters negatively influences diagnostics measuring the plasma. The article describes design phase and some preliminary results of the filters for the Power Supplies
Klíčová slova:
COMPASS tokamak; magnetic field; plasma
Dokument je dostupný na externích webových stránkách.
Design and Preliminary Results of the COMPASS Power Supplies Filters
The COMPASS tokamak uses rectifying thyristor converters as Power Supplies for the major slow coils circuits. 24-pulse thyristor converter is used for Toroidal Field circuit and 12-pulse converters ...
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