Plasma tomographic reconstruction from tangentially viewing camera with background subtraction

0435638 - ÚFP 2015 RIV US eng J - Journal Article
Odstrčil, M. - Mlynář, Jan - Weinzettl, Vladimír - Háček, Pavel - Odstrčil, T. - Verdoolaege, G. - Berta, M. - Szabolics, T. - Bencze, A.
Plasma tomographic reconstruction from tangentially viewing camera with background subtraction.
Review of Scientific Instruments. Roč. 85, č. 1 (2014), 013509-013509. ISSN 0034-6748. E-ISSN 1089-7623
R&D Projects: GA ČR GAP205/10/2055
Institutional support: RVO:61389021
Keywords : X-ray tomography * edge turbulence * tokamak * NSTX * TCV * COMPASS
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 1.614, year: 2014
http://scitation.aip.org/content/aip/journal/rsi/85/1/10.1063/1.4862652

Light reflections are one of the main and often underestimated issues of plasma emissivity reconstruction in visible light spectral range. Metallic and other specular components of tokamak generate systematic errors in the optical measurements that could lead to wrong interpretation of data. Our analysis is performed at data from the tokamak COMPASS. It is a D-shaped tokamak with specular metallic vessel and possibility of the H-mode plasma. Data from fast visible light camera were used for tomographic reconstruction with background reflections subtraction to study plasma boundary. In this article, we show that despite highly specular tokamak wall, it is possible to obtain a realistic reconstruction. The developed algorithm shows robust results despite of systematic errors in the optical measurements and calibration. The motivation is to obtain an independent estimate of the plasma boundary shape.
Permanent Link: http://hdl.handle.net/11104/0239443