15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

8.31 A Divertor Scraper Observation System for Wendelstein 7-X

17 Apr 2018, 16:00
1d 2h
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Glen Wurden (Los Alamos National Laboratory) Joris Fellinger (Max Planck Institute for Plasma Physics) Peter Drewelow (Max Planck Institute for Plasma Physics) Oliver Ford (Max Planck Institute for Plasma Physics) Marc Gamradt (Max Planck Institute for Plasma Physics) Henry Greve (Max Planck Institute for Plasma Physics) Marcin Jakubowski (Max Planck Institute for Plasma Physics) Hartmut Jenzsch (Max Planck Institute for Plasma Physics) Holger Niemann (Max Planck Institute for Plasma Physics) Aleix Puig Sitjes (Max Planck Institute for Plasma Physics) The W7-X Team (Max Planck Institute for Plasma Physics)

Description

A graphite element, called a scraper [1], will be installed in 2018 on the Wendelstein 7-X stellarator in the throat of the divertor (at two out of ten potential toroidal locations). We have designed, built, and calibrated a new infrared/visible imaging endoscope system to enable detailed observations of the plasma interactions and heat loads at one of the scrapers, and the neighboring divertor surfaces. The new endoscope uses a shuttered, pinhole-protected, pair of 90° off-axis 218 mm focal length aluminum parabolic mirrors in vacuum, and two flat turning metal mirrors, to send light to a sapphire window 1.4 meters away, beyond which we have co-located telephoto lens-based mid-infrared and visible cameras. The camera field of view covers the entire 650 mm length of the scraper, and includes locations monitored by thermocouples and Langmuir probes embedded in some of the scraper tiles. Detailed design, assembly tests, installation, and comparison of predicted (ZEMAX) and actual optical test performance will be discussed.
[1] A. Lumsdaine, et al., IEEE Transactions on Plasma Science (Volume: 44, Issue: 9, pg. 1738-1744, Sept. 2016 )

Primary author

Glen Wurden (Los Alamos National Laboratory)

Co-authors

Joris Fellinger (Max Planck Institute for Plasma Physics) Peter Drewelow (Max Planck Institute for Plasma Physics) Oliver Ford (Max Planck Institute for Plasma Physics) Marc Gamradt (Max Planck Institute for Plasma Physics) Henry Greve (Max Planck Institute for Plasma Physics) Marcin Jakubowski (Max Planck Institute for Plasma Physics) Hartmut Jenzsch (Max Planck Institute for Plasma Physics) Holger Niemann (Max Planck Institute for Plasma Physics) Aleix Puig Sitjes (Max Planck Institute for Plasma Physics) The W7-X Team (Max Planck Institute for Plasma Physics)

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