Optimization of soft X-ray tomography on the COMPASS tokamak
Author:
Imríšek Martin1, Mlynář Jan1, Löffelmann Viktor1, Weinzettl Vladimír1, Odstrčil Tomáš2, Odstrčil Michal3, Tomeš Matěj1
Affiliation:
1. Institute of Plasma Physics ASCR v.v.i., Faculty of Mathematics and Physics, Charles University in Prague, Za Slovankou 3, 18200 Praha 8, Czechia 2. Max-Planck-Institut für Plasmaphysik, Technische Universität Munchen, Boltzmannstraße 2, D-85748 Garching, Germany 3. Optoelectronic Research Center, University of Southampton, University Rd, Southampton SO17 1BJ, United Kingdom of Great Britain and Northern Ireland
Abstract
Abstract
The COMPASS tokamak is equipped with the soft X-ray (SXR) diagnostic system based on silicon photodiode arrays shielded by a thin beryllium foil. The diagnostic is composed of two pinhole cameras having 35 channels each and one vertical pinhole camera with 20 channels, which was installed recently to improve tomographic inversions. Lines of sight of the SXR detectors cover almost complete poloidal cross section of the COMPASS vessel with a spatial resolution of 1-2 cm and temporal resolution of about 3 μs. Local emissivity is reconstructed via Tikhonov regularization constrained by minimum Fisher information that provides reliable and robust solution despite limited number of projections and ill-conditionality of this task. Improved border conditions and numerical differentiation matrices suppressing artifacts in reconstructed radiation were implemented in the code. Furthermore, a fast algorithm eliminating iterative processes was developed, and it is foreseen to be tested in real-time plasma control.
Publisher
Walter de Gruyter GmbH
Subject
Waste Management and Disposal,Condensed Matter Physics,Safety, Risk, Reliability and Quality,Instrumentation,Nuclear Energy and Engineering,Nuclear and High Energy Physics
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