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Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements

W7-X Team; Perseo, Valeria; Gradic, Dorothea; König, Ralf; Ford, Oliver P.; Killer, Carsten; Grulke, Olaf; Ennis, David A.; Gantenbein, Gerd; Huber, Martina; Illy, Stefan; Jelonnek, John; Kobarg, Thorsten; Lang, Rouven; Leonhardt, Wolfgang; Mellein, Daniel; Papenfuß, Daniel; Scherer, Theo; Thumm, Manfred; Wadle, Simone; Weggen, Jörg

Abstract (englisch):
In the last decade, Coherence Imaging Spectroscopy (CIS) has shown distinctive results in measuring ion flow velocities in the edge of magnetically confined plasma devices. Its 2D spatially resolved measurement capabilities and its high optical throughput are ideal for investigating the impurity behavior in the complex 3D magnetic island topology edge of Wendelstein 7-X (W7-X). However, a highly precise and stable calibration method is required for a reliable diagnostic operation. A new level of precision and stability has been achieved for the two CIS systems installed at W7-X with the use of a new calibration source, a continuous tunable laser commercially available only since 2015. A specific prototype model was successfully adapted to the challenging requirements of W7-X, granting high accuracy (±0.01 pm) and flexibility (spectral range: 450–650 nm) in the wavelength calibration required for measuring low-Z impurity ion flow velocities. These features opened up new investigation possibilities on temperature stability and wavelength response of the CIS components, allowing to fully characterize and validate the W7-X systems. The CIS diagnostic was operational throughout the last W7-X experimental campaign. ... mehr

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DOI: 10.1063/1.5126098
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2020
Sprache Englisch
Identifikator ISSN: 0034-6748, 1089-7623
KITopen-ID: 1000117800
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Erschienen in Review of scientific instruments
Band 91
Heft 1
Seiten Article: 013501
Projektinformation EUROfusion (EU, H2020, 633053)
Nachgewiesen in Web of Science
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