Speaker
Didier Chauvin
(CEA de Cadarache DSM/IRFM)
Description
The Wendelstein 7-X fusion device at Max-Planck-Institut für Plasma Physik (IPP) in Greifswald produced its first hydrogen plasma on 3rdrd February 2016. This marks the start of scientific operation. Wendelstein 7-X is to investigate this configuration’s suitability for use in a power plant. In order to allow for an early integral test of the main systems needed for plasma operation (magnet system, vacuum, plasma heating, control and data acquisition, etc), the divertor units and most of the carbon tiles covering the wall protection elements will be installed after the first operational phase OP1.1. For the later operation phases, the convective plasma heat fluxes will be distributed over a much larger area provided by the divertor target plates. An important diagnostic for W7-X will be thermography systems monitoring the surface temperature of the divertor target plates by collecting and processing infrared (IR) and visible (VIS) light from the divertor region of the plasma. For this purpose the company Thales SESO has been assigned to design, build, test, deliver and install 2 first prototypes of IRVIS (InfraRed-VISible) endoscope systems for the divertor of the W7-X Stellarator. Thermography is part of the operational and protective divertor diagnostics and has to detect signals indicating anomalous operation scenarios. The design of the horizontal and vertical target plates and the baffles in the divertor should keep the local power load below 10 MW/m2. The current design of IRVIS endoscope is composed of four major elements: In-Vessel optical system (Cassegrain telescope system), ex-vessel optics (including dichroitic beam splitters, re-imaging optics and detectors), a cooled vacuum housing and an in-vessel shutter including drive and calibration equipment. The system is designed to operate under heavy-duty conditions. Design, integration, tests and manufacturing progress will be explicitly described in this paper.
Co-authors
Axel Lorenz
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Dag Hathiramani
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Denis Fappani
(Thales SESO SAS, 530, rue Frédéric Joliot 13593 Aix-en-Provence Cedex 3, France)
Didier Chauvin
(CEA de Cadarache DSM/IRFM, 13108 Saint-Paul-lez-Durance, France)
Gwenn Pallier
(Thales SESO SAS, 530, rue Frédéric Joliot 13593 Aix-en-Provence Cedex 3, France)
Hartmut Jenzsch
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Joris Fellinger
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Maciej Krychowiak
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Marc Gamradt
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Marcin Jakubowski
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Ralf Konig
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Thibault Dufour
(Thales SESO SAS, 530, rue Frédéric Joliot 13593 Aix-en-Provence Cedex 3, France)
Thomas Sunn Pedersen
(W7-X, Max-Planck Institut, Wendelsteinstrasse 1 -17489 Greifswald, Germany)
Uwe Lippmann
(Fraunhofer IOF, Institut für Angewandte Optik und Feinmechanik, Albert-Einstein-Str. 7 07745 Jena, Germany)
