Author: "Naydenkova, D.I." / Database: Academic Search Index - Searchworks@Jio Institute Digital Library Search Results

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Author: Weinzettl, V., Naydenkova, D.I., Sestak, D., Vlcek, J., Mlynar, J., Melich, R., Jares, D., Malot, J., Sarychev, D., and Igochine, V.
Subjects: *PLASMA spectroscopy, *TOMOGRAPHY, *TRANSPORT theory, *TOKAMAKS, *PLASMA diagnostics, *TURBULENCE, *MAGNETIC fields
Abstract: Abstract: The integrated spectroscopic system for visible plasma radiation, soft X-ray, and bolometric measurements has been designed for the COMPASS tokamak. This diagnostic allows tomographic reconstruction at a few microseconds time base and features an improved spatial resolution about 1cm in the pedestal region, where the highest gradient of plasma pressure drives turbulent structures and their propagation towards the wall. In combination with other developed diagnostics on COMPASS, it represents an ideal tool for a measurement and characterization of these radiating plasma structures, which are responsible for an extremely high particle/energy transport across magnetic field. The design of the new integrated multi-channel spectroscopic diagnostics is reviewed and corresponding technical challenges are described. Additionally, the methods, which will be used for data processing, are briefly mentioned and target physics is discussed. [ABSTRACT FROM AUTHOR]
Published: 2010
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Author: Weinzettl, V., Panek, R., Hron, M., Stockel, J., Zacek, F., Havlicek, J., Bilkova, P., Naydenkova, D.I., Hacek, P., Zajac, J., Dejarnac, R., Horacek, J., Adamek, J., Mlynar, J., Janky, F., Aftanas, M., Bohm, P., Brotankova, J., Sestak, D., and Duran, I.
Subjects: *PLASMA diagnostics, *TOKAMAKS, *FUSION reactors, *TRANSPORT theory, *PARTICLE beams, *MICROWAVES, *NUCLEAR engineering
Abstract: Abstract: The COMPASS tokamak, a divertor device with clear H-mode and ITER-relevant geometry, has been re-installed in IPP Prague after its transport from CCFE in UK. The first plasma was achieved in December 2008. Many new diagnostic tools with both high temporal and spatial resolutions have been developed to address the scientific programme of COMPASS focused on H-mode physics and pedestal investigations. In the paper, an overview of existing and in near future planned diagnostics (magnetic, spectroscopy, microwave, probe and beam/particle) on COMPASS is given including their basic technical specifications and achievements. [Copyright &y& Elsevier]
Published: 2011
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Author: Šesták, D., Weinzettl, V., Bílková, P., Böhm, P., Aftanas, M., Naydenkova, D.I., Stöckel, J., Ďuran, I., and Walsh, M.J.
Subjects: *TOKAMAKS, *OPTICAL engineering, *SIGNAL processing, *THOMSON scattering, *LASERS in physics, *ELECTRON temperature, *ELECTRON distribution, *PLASMA diagnostics
Abstract: Abstract: The paper generally outlines a design of new multichannel optical diagnostics for the COMPASS (COMPact ASSembly) tokamak. The final design of a port plug for a multispectral diagnostic tool is introduced and its evolution taking into consideration spatial and other technical restrictions is reviewed. A similar solution of both focusing optics and optical signal diversion will be used for a new Thomson scattering (TS) system, which is specified in the second part of the article. Main parameters of the TS system, such as laser energy and regions of observation, were determined with respect to both electron temperature and density profiles and required ultrahigh spatial resolution at the plasma edge. [Copyright &y& Elsevier]
Published: 2009
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