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First results from an event synchronized—high repetition Thomson scattering system at Wendelstein 7-X

W7-X Team; Damm, Hannes; Pasch, Ekkehard; Dinklage, Andreas; Baldzuhn, Juergen; Bozhenkov, S.A.; Brunner, Kai Jakob; Effenberg, Florian; Fuchert, Golo; Geiger, Joachim; Harris, Jeffrey H.; Knauer, Jens; Kornejew, Petra; Kremeyer, Thierry; Krychowiak, Maciej; Schilling, Jonathan; Schmitz, Oliver; Scott, Evan R.; Winters, Victoria R.; Gantenbein, Gerd; Huber, Martina; ... mehr

Abstract (englisch):
The Wendelstein 7-X Thomson scattering diagnostic was upgraded to transiently achieve kilohertz sampling rates combined with adjustable measuring times. The existing Nd:YAG lasers are employed to repetitively emit "bursts", i.e. multiple laser pulses in a short time interval. Appropriately timing bursts in the three available lasers, up to twelve evenly spaced consecutive measurements per burst are possible. The pulse-to-pulse increment within a burst can be tuned from 2 μs to 33. ms (500 kHz-30 Hz). Additionally, an event trigger system was developed to synchronize the burst Thomson scattering measurements to plasma events. Exemplary, a case of fast electron density and temperature evolution after cryogenic H2 pellet injection is presented in order to demonstrate the capabilities of the method.

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Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 1748-0221
KITopen-ID: 1000119984
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in Journal of Instrumentation
Verlag IOP Publishing
Band 14
Heft 9
Projektinformation EUROfusion (EU, H2020, 633053)
Bemerkung zur Veröffentlichung 3rd European Conference on Plasma Diagnostics (ECPD2019)
Vorab online veröffentlicht am 20.09.2019
Externe Relationen Abstract/Volltext
Nachgewiesen in Dimensions
Web of Science
Scopus
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