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Realization of a gas puff imaging system on the Wendelstein 7-X stellarator

W7-X Team 1; Terry, J. L. ; Stechow, A. von; Baek, S. G.; Ballinger, S. B.; Grulke, O.; Sehren, C. von; Laube, R.; Killer, C.; Scharmer, F.; Brunner, K. J.; Knauer, J.; Bois, S.
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

A system for studying the spatiotemporal dynamics of fluctuations in the boundary of the W7-X plasma using the “Gas-Puff Imaging” (GPI) technique has been designed, constructed, installed, and operated. This GPI system addresses a number of challenges specific to long-pulse superconducting devices, such as W7-X, including the long distance between the plasma and the vacuum vessel wall, the long distance between the plasma and diagnostic ports, the range of last closed flux surface (LCFS) locations for different magnetic configurations in W7-X, and management of heat loads on the system’s plasma-facing components. The system features a pair of “converging–diverging” nozzles for partially collimating the gas puffed locally ≈135 mm radially outboard of the plasma boundary, a pop-up turning mirror for viewing the gas puff emission from the side (which also acts as a shutter for the re-entrant vacuum window), and a high-throughput optical system that collects visible emission resulting from the interaction between the puffed gas and the plasma and directs it along a water-cooled re-entrant tube directly onto the 8 × 16 pixel detector array of the fast camera. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000174312
Frei zugänglich ab 02.09.2025
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 10.09.2024
Sprache Englisch
Identifikator ISSN: 0034-6748, 1089-7623
KITopen-ID: 1000174312
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Review of Scientific Instruments
Verlag American Institute of Physics (AIP)
Band 95
Heft 9
Seiten Art.-Nr.: 093517
Projektinformation EUROfusion (EU, EU 9. RP, 101052200)
Vorab online veröffentlicht am 01.09.2024
Nachgewiesen in Scopus
Web of Science
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