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arxiv: 1907.00492 · v2 · pith:CXATYKR7 · submitted 2019-06-30 · physics.plasm-ph

First Results from an Event Synchronized -- High Repetition Thomson Scattering System at Wendelstein 7-X

Hannes Damm , Ekkehard Pasch , Andreas Dinklage , J\"urgen Baldzuhn , Sergey Bozhenkov , Kai Jakob Brunner , Florian Effenberg , Golo Fuchert
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Joachim Geiger Jeffrey Harris Jens Knauer Petra Kornejew Thierry Kremeyer Maciej Krychowiak Jonathan Schilling Oliver Schmitz Evan Scott Victoria Winters the Wendelstein 7-X Team
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classification physics.plasm-ph
keywords burstscatteringthomsoneventlasersmeasurementssystemwendelstein
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The Wendelstein 7-X (W7-X) Thomson scattering (TS) 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 burst 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 ms to 33.3 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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