Tomography diagnostic of plasma radiated power on the spherical tokamak Globus-M

A diagnostic system for plasma radiated power tomography on Globus-M was upgraded with a new linear array based on silicon photodiodes. The hardware of the diagnostic system based on a 256-channel tangential matrix array and a 24-channel linear array is described. The algorithm for 2D tomographic re...

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Bibliographic Details
Published in:Review of scientific instruments 2018-08, Vol.89 (8), p.083509-083509
Main Authors: Sladkomedova, A. D., Alekseev, A. G., Bakharev, N. N., Gusev, V. K., Khromov, N. A., Kurskiev, G. S., Minaev, V. B., Patrov, M. I., Petrov, Yu. V., Sakharov, N. V., Shchegolev, P. B., Solokha, V. V., Telnova, A. Yu, Tolstyakov, S. Yu, Zabrodsky, V. V.
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Constraint modelling
Data analysis
Diagnostic systems
Emissivity
Fluid dynamics
Fluid flow
Linear arrays
Magnetohydrodynamics
Mathematical analysis
Matrix methods
Neutral beams
Photodiodes
Plasmas (physics)
Regularization
Regularization methods
Scientific apparatus & instruments
Tokamak devices
Tomography
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Summary:A diagnostic system for plasma radiated power tomography on Globus-M was upgraded with a new linear array based on silicon photodiodes. The hardware of the diagnostic system based on a 256-channel tangential matrix array and a 24-channel linear array is described. The algorithm for 2D tomographic reconstruction of plasma emissivity is presented. It uses the Tikhonov regularization method and anisotropic diffusion functional as a side constraint. Simulated plasma emissivity profiles were used to test and assess the capabilities of the developed algorithm. Data analysis was carried out in ohmic and neutral beam heated discharges to demonstrate the performance of the tomography diagnostic in plasmas with different parameters. The presented results illustrate the proper functioning of the tomography system that allowed to reveal and study various plasma phenomena, including magnetohydrodynamic mode.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5039801