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Infrared imaging systems for wall protection in the W7-X stellarator (invited)

Authors :
Joris Fellinger
Yu Gao
Barbara Cannas
Tran Thanh Ngo
Didier Chauvin
Marc Gamradt
W XTeam
Christoph Biedermann
Adnan Ali
G. A. Wurden
Aleix Puig Sitjes
P. Drewelow
V. Moncada
Dag Hathiramani
Ralf König
M. W. Jakubowski
H. Greve
Thomas Sunn Pedersen
Fabio Pisano
Holger Niemann
A. Lorenz
W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society
Source :
Review of Scientific Instruments
Publication Year :
2018

Abstract

Wendelstein 7-X aims at quasi-steady state operation with up to 10 MW of heating power for 30 min. Power exhaust will be handled predominantly via 10 actively water cooled CFC (carbon-fiber-reinforced carbon) based divertor units designed to withstand power loads of 10 MW/m2 locally in steady state. If local loads exceed this value, a risk of local delamination of the CFC and failure of entire divertor modules arises. Infrared endoscopes to monitor all main plasma facing components are being prepared, and near real time software tools are under development to identify areas of excessive temperature rise, to distinguish them from non-critical events, and to trigger alarms. Tests with different cameras were made in the recent campaign. Long pulse operation enforces additional diagnostic design constraints: for example, the optics need to be thermally decoupled from the endoscope housing. In the upcoming experimental campaign, a graphite scraper element, in front of the island divertor throat, will be tested as a possible means to protect the divertor pumping gap edges during the transient discharge evolution.

Details

ISSN :
10897623
Volume :
89
Issue :
10
Database :
OpenAIRE
Journal :
The Review of scientific instruments
Accession number :
edsair.doi.dedup.....55832cba277e4aebbde8a679b6f0ea2f