A divertor scraper observation system for the Wendelstein 7-X stellarator

Journal Article · 06 August 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5035078 · OSTI ID:1467276

Wurden, G. A.  ^[1]; Fellinger, J. ^[2]; Biedermann, C. ^[2]; Drewelow, P.  ^[2]; Ford, O.  ^[2]; Gamradt, M. ^[2]; Greve, H. ^[2]; Herold, F. ^[2]; Jakubowski, M.  ^[2]; Jenzsch, H. ^[2]; Niemann, H. ^[2]; Puig Sitjes, A. ^[2]

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1. Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
2. Max-Planck-Institute für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany

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 then compared.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Commission (EC)
• Contributing Organization: W7-X Team
• Grant/Contract Number: AC52-06NA25396; 633053
• OSTI ID: 1467276
• Alternate ID(s): OSTI ID: 1463041
• Report Number(s): LA-UR-17-31225
• Journal Information: Review of Scientific Instruments, Vol. 89, Issue 10; Conference: High Temperature Plasma Diagnostics ; 2018-04-16 - 2018-04-16 ; San Diego, California, United States; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)Copyright Statement
• Country of Publication: United States
• Language: English