Abstract
Two graphite divertor elements called scrapers have been installed on the Wendelstein 7-X stellarator in the throat of the magnetic island divertor. To diagnose one, we have designed, built, calibrated, and installed 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 nearby divertor surfaces. The new system uses a shuttered pinhole-protected pair of 90° off-axis 228 mm focal length aluminum parabolic mirrors, and two flat turning metal mirrors, to send light to a sapphire vacuum window 1.6 meters away, beyond which we have co-located telephoto lens-based infrared and visible cameras. The back-to-back off-axis parabolas serve to cancel out most aberrations, enabling the use of off-the-shelf commercial optics outside of the vessel. For the infrared, we use a 3-5 μm 1-megapixel FLIR SC8303HD camera and for the visible, a 5-megapixel CMOS PCO 5.5 edge camera. A short 1-m quartz pickoff fiber is used to send 200-1100 nm light to a compact spectrometer, also located in the same iron shield box as the cameras. The camera field of view covers the 700 mm length of the scraper, and includes locations monitored by thermocouples and Langmuir probes embedded in some of the scraper tiles. Predicted and actual optical test performances of the overall system are compared.
Highlights
Two graphite divertor elements called scrapers have been installed on the Wendelstein 7-X stellarator in the throat of the magnetic island divertor
The camera field of view covers the 700 mm length of the scraper, and includes locations monitored by thermocouples and Langmuir probes embedded in some of the scraper tiles
The second campaign of Wendelstein 7-X began in August 2017, with a primary purpose of testing newly installed test divertor hardware,1 designed for handling heat loads from magnetic islands, in 10 locations
Summary
The second campaign of Wendelstein 7-X began in August 2017, with a primary purpose of testing newly installed test divertor hardware, designed for handling heat loads from magnetic islands, in 10 locations (two per module, with fivefold symmetry). It was recognized for long pulses that during the transition from low to high beta, as the magnetic islands change shape, changing energy and particle fluxes could overload and possibly damage the pumping duct gap region. This could be simulated in short discharges, using a special magnetic configuration.. The upper scraper in module 5 can be seen in the right-side upper foreground in Fig. 1, along with horizontal and vertical targets of the upper divertor, extending away into the background
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