Персона: Хуснутдинов, Радмир Ильдарович
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Development of a tomographic reconstruction method for axisymmetric D(alpha)emission profiles in the ITER plasma boundary
A tomographic method for reconstructing the axially symmetric D(alpha)emission profile in the ITER scrape-off layer and divertor from D(alpha)intensity measurements in the fields of view (FoV) of Vis/IR TV and Divertor Impurity Monitor diagnostics is under development. The method takes into account the strong background signal due to stray light from divertor produced by reflections from the metal wall of the vacuum chamber. The method allows to filter out the reflections in D(alpha)signals measured in the main chamber. The accuracy of this method is tested within the framework of a synthetic diagnostic, which uses the Raysect and Cherab numerical codes for ray-tracing simulations. The D(alpha)emission profiles, simulated with the SOLPS and OEDGE codes, are used as synthetic experimental data. Uncertainty in light reflection properties of the first wall (FW) is the major factor affecting the accuracy of the D(alpha)emission reconstruction. The dependence on the uncertainty in the FW surface roughness and on the ratio of diffusive to specular reflection of the error in recovering useful D(alpha)signals (the direct light without reflections) in the FoV of the ITER main chamber H-alpha and Visible Spectroscopy Diagnostic is obtained.
Assessing global beryllium erosion via tomographic reconstruction of 3D beryllium emission profiles in ITER
MODELLING OF SPUTTERING RATE OF THE TOKAMAK FIRST WALL BY HYDROGEN ISOTOPES ATOMS IN THE NEAR-WALL PLASMA МОДЕЛИРОВАНИЕ СКОРОСТИ РАСПЫЛЕНИЯ ПЕРВОИ СТЕНКИ ТОКАМАКА АТОМАМИ ИЗОТОПОВ ВОДОРОДА В ПРИСТЕНОЧНОИ ПЛАЗМЕ
Modification of SXB Method for Hydrogen in ITER Main Chamber
© 2019, Pleiades Publishing, Ltd.A modification of the SXB method, used for evaluating the atom/ion flux from the tokamak first wall into plasma using the observed wavelength-integrated spectral line intensity, is proposed. The modification allows, using the high-resolution spectroscopy data, to estimate — in real time measurements — the fluxes of atomic and molecular hydrogen from the first wall of the tokamak main chamber into plasma without measurements of molecular spectra. The modified SXB method is tested by comparing the results with the SOLPS code simulations for six modelled types of the SOL plasma profiles in ITER. The proposed modification is motivated by the fact that the hydrogen molecular spectra will not be used for ITER operation diagnostics because of difficulties of their interpretation.
Generalization of Modified SXB Method for Hydrogen to the Case of Isotope Mixture
Computer Tomography on Divertor Impurity Monitor for ITER with Minimizing Errors in a Logarithmic Scale
© 2021 The Japan Society of Plasma Science and Nuclear Fusion ResearchThe computer tomography for divertor impurity monitor, which measures plasma emissions in the divertor region, for ITER has been conducted using a ray-tracing technique. We have attempted four different solution methods for the inversion problem and compared the results. The solution methods which minimize errors in logarithmic scale had better performance than the methods which minimize errors in linear scale. This is likely due to the fact that the values in the emission profile vary in a wide range of orders of magnitude. The accuracy of the reconstruction has been investigated by changing discharge conditions and the number of field-of-views used. The deterioration in accuracy was most noticeable when the emission profile was reconstructed using only two field-of-views. In addition, the accuracy deteriorated, making the estimation more challenging, under discharge conditions with low emission intensity because of the wider range of emission intensity under such conditions.