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Abstract

On Tore Supra, five far infrared (FIR) retro-reflected channels have been installed to double the existing traversing ones, in order to increase the spatial resolution of the electron and current density measured by the interfero-polarimeter diagnostic.
The new channel geometries are similar to those of the intended ITER polarimeter and have been designed for long pulse plasma operation. Inside the tokamak, the beams are reflected on edge-cooled retro-reflectors. During the 2003-2004 TS campaign, a prototype and reference plan mirrors had been exposed to plasma. After their removals, quantitative SIMS deposit analysis estimate the thickness of the carbon up to 700 nm and FIR measurements confirmed that the surface changes were too small to modify the reflectivity of the mirrors.
The transport of the FIR beams by mirrors to the detectors is then discussed. Ray tracings through plasma and mirrors have been done to rightly design and position the windows, the detectors and the separation grids and minimize the misalignment effects.
First results of both interferometric and polarimetric reflected channel signals show a good consistency with the traversing ones and allow resolving more accurately the profiles.

Additional information

Authors: GIL C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ELBEZE D, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BERAUD A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ECHARD B, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);PATTERLINI J C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);PHILIP J, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);TOULOUSE L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LIPA M, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LITNOVSKY A, Institut für Plasmaphysik Forschungszentrum Juelich GmbH, Juelich (DE)
Bibliographic Reference: An article published in: Fusion Engineering and Design (2007), online edition
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.sciencedirect.com/science/journal/09203796
Record Number: 200719036 / Last updated on: 2007-04-02
Category: PUBLICATION
Original language: en
Available languages: en