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The polarimeter system for ITER features 10 viewing chords covering almost the full poloidal cross section of the plasma in a fan-like arrangement. The 10 laser beams all enter the plasma via 150 mm diam penetrations through the diagnostic plug at the low-field side. Small retroreflectors at the high-field side mirror the laser beams back towards the penetrations at the low-field side. Extensive feasibility calculations have led to the conclusion that the optimum wavelength for the polarimeter is around 100 mu m. At this wavelength counterproductive effects like refraction and electron cyclotron absorption are negligibly small. However, the anticipated Faraday rotation angles are still very large, such that several important plasma parameters can be measured within the requirements set by the ITER team. In this article the status of the conceptual design of the polarimeter system for ITER will be presented.

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Authors: DONNÉ A J H, FOM-Rijnhuisen, Association EURATOM-FOM, Nieuwegein (NL);EDLINGTON T, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);JOFFRIN E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);KOSLOWSKI H R, Forschungszentrum Jülich GmbH, Jülich (DE);NIESWAND C, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);SEGRE S E, INFM, II Universitá di Roma, Frascati (IT);STOTT P E, JET Joint Undertaking, Abingdon (GB);WALKER C, ITER Joint Central Team, Garching (DE)
Bibliographic Reference: An article published in: Review of Scientific Instruments, Volume 70, pp. 726-729 (1999)
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Record Number: 200719160 / Last updated on: 2007-05-21
Original language: en
Available languages: en