Autor: Kravtsov, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Possible accuracy of the Cotton-Mouton polarimetry in a sheared toroidal plasma
Autorzy:: Kravtsov, , Y. A.
Chrzanowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/146672.pdf
Data publikacji:: 2011
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: diagnostics plasma
Cotton-Mouton effect
complex polarization angle
Opis:: The Cotton-Mouton effect in the sheared plasma with helical magnetic lines is studied, using the equation for the complex amplitude ratio (CAR). A simple model for helical magnetic lines in plasma of toroidal configuration is suggested. Equation for CAR is solved perturbatively, treating the shear angle variations as a small perturbation, caused by the spiral form of the magnetic lines. It is shown that the uncertainty of the polarization measurements in the toroidal plasma with a spiral form of the magnetic lines does not exceed 1.0–2.0%, which determines the limiting accuracy of the Cotton-Mouton polarimetry. It is furthermore pointed out that the method of a priori subtraction of the “sheared” term may significantly improve the accuracy of the Cotton-Mouton polarimetry.
Źródło:: Nukleonika; 2011, 56, 2; 175-177
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A new method of determining the parameters of thermonuclear plasma on the basis of multichannel polarimetric measurements
Autorzy:: Chrzanowski, J.
Kravtsov, Y.A.
Powiązania:: https://bibliotekanauki.pl/articles/148759.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: angular variables
gradient method
plasma diagnostics
plasma polarimetry
polarimetric data inversion
Opis:: A gradient method has been proposed as an effective procedure to reconstruct real parameters of tokamak plasma by means of multichannel polarimetric measurements. High efficiency of the suggested procedure is illustrated by numerical calculations performed for a given plasma model taking into account the poloidal component of magnetic field. Polarization state of electromagnetic wave traditionally is characterized by azimuthal – ψ and ellipticity – χ angles. Evolution of these parameters along the ray is described by the equations of angular variables technique (AVT) introduced in previous works of the present authors. Numerical simulations have approved that the gradient procedure provides acceptable accuracy of inversion already after several iterations.
Źródło:: Nukleonika; 2013, 58, 2; 281-285
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Localized plasma polarimetry based on the phenomenon of normal mode conversion
Autorzy:: Kravtsov, , Y. A.
Bieg, B.
Powiązania:: https://bibliotekanauki.pl/articles/146670.pdf
Data publikacji:: 2011
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: plasma
polarimetry
mode conversion
Opis:: A new geometry of microwave polarimetric measurements is presented, which realizes a localized plasma polarimetry based on the phenomenon of electromagnetic mode conversion. Such a conversion takes place in the tokamak plasma, in the vicinity of the point where the microwave beam is orthogonal to one of the helical magnetic lines. In distinction to the traditional plasma polarimetry, which deals with the line averaged plasma parameters, the new methodology allows for a measurement of the local values of plasma parameters near the point of orthogonality. This methodology was shown to be very efficient in studies of the solar radio emission and polarization properties of radio waves passing through the Earth ionosphere. In the following the theory of electromagnetic mode conversion is described and conditions of its applicability are analyzed. It is shown that localized polarimetric measurements of plasma parameters in the geometry of the international thermonuclear experimental reactor (ITER) device would require very high electron densities Ne, exceeding 1017 cm–3, i.e. thousand times higher than those envisaged in the ITER project.
Źródło:: Nukleonika; 2011, 56, 2; 171-174
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Unconventional procedure for inversion of polarimetric data: numerical calculation for a simple model of toroidal plasma
Autorzy:: Chrzanowski, J.
Kravtsov, , Y. A.
Mazon, D.
Powiązania:: https://bibliotekanauki.pl/articles/147712.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Cotton-Mouton effect
Faraday effect
gradient method
Opis:: A gradient method is proposed for inversion of polarimetric data for tokamak plasma. It is assumed that the electron density and the normalized magnetic profile along the ray are known from experiments (scattering and magnetic measurements) in the spirit of the EFIT approach. Under these assumptions the maximum value of the electron density and maximum value of the magnetic field may be estimated by the gradient method. It is shown that with this method it is possible to achieve accuracy of about 0.1% already after 3-4 iterations.
Źródło:: Nukleonika; 2012, 57, 1; 37-41
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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