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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 ...
Parallel Heat Flux Decay Length Study in the COMPASS Tokamak Using MWIR and LWIR Cameras
Vondráček, Petr; Horáček, Jan; Pánek, Radomír; Gauthier, E.
2014 - English
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.
Keywords:
Plasma diagnostics; infrared thermography; infrared camera; tokamak; near SOL
Fulltext is available at external website.
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 - English
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
Keywords:
U-probe; tokamak; COMPASS; plasma; Langmuir probes
Fulltext is available at external website.
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 - English
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.
Keywords:
tokamak; COMPASS; spectrometer HR 2000+
Fulltext is available at external website.
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 ...
Infrared Thermography on the COMPASS Tokamak
Vondráček, Petr; Horáček, Jan; Cahyna, Pavel; Pánek, Radomír; Uličný, J.
2013 - English
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.
Keywords:
Plasma diagnostics; infrared camera; tokamak
Fulltext is available at external website.
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 ...
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 - English
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.
Keywords:
Diagnostic lithium beam; Plasma diagnostics; tokamak
Fulltext is available at external website.
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 ...
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