title: Plasma tomographic reconstruction from tangentially viewing camera with background subtraction.
abstract: 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.
authors: Optical Research Center, University Southampton, Southampton, United Kingdom.
authors: M
authors: M
authors: Odstrčil
authors: Institute of Plasma Physics ASCR, Association EUROATOM/PPP.CR Prague, Czech Republic.
authors: J
authors: J
authors: Mlynář
authors: Institute of Plasma Physics ASCR, Association EUROATOM/PPP.CR Prague, Czech Republic.
authors: V
authors: V
authors: Weinzettl
authors: Institute of Plasma Physics ASCR, Association EUROATOM/PPP.CR Prague, Czech Republic.
authors: P
authors: P
authors: Háček
authors: Max-Planck-Institut für Plasmaphysik, Garching, Germany.
authors: T
authors: T
authors: Odstrčil
authors: Department of Applied Physics, Ghent University, B-9000 Ghent, Belgium and Association EURATOM - Belgian State, Laboratory for Plasma Physics, Koninklijke Militaire School Ecole Royale Militaire, B-1000 Brussels, Belgium.
authors: G
authors: G
authors: Verdoolaege
authors: Institute of Plasma Physics ASCR, Association EUROATOM/PPP.CR Prague, Czech Republic.
authors: M
authors: M
authors: Berta
authors: Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Association EUROATOM/HAS, Budapest, Hungary.
authors: T
authors: T
authors: Szabolics
authors: Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Association EUROATOM/HAS, Budapest, Hungary.
authors: A
authors: A
authors: Bencze