학술논문
First Results from an Event Synchronized -- High Repetition Thomson Scattering System at Wendelstein 7-X
Document Type
Working Paper
Author
Damm, Hannes; Pasch, Ekkehard; Dinklage, Andreas; Baldzuhn, Jürgen; Bozhenkov, Sergey; Brunner, Kai Jakob; Effenberg, Florian; Fuchert, Golo; Geiger, Joachim; Harris, Jeffrey; Knauer, Jens; Kornejew, Petra; Kremeyer, Thierry; Krychowiak, Maciej; Schilling, Jonathan; Schmitz, Oliver; Scott, Evan; Winters, Victoria; Team, the Wendelstein 7-X
Source
Subject
Language
Abstract
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.
Comment: 11 pages, 5 figures, To be published as proceeding to the 3rd European Conference on Plasma Diagnostics 2019 in Lisbon in the Proceedings Section of the Journal of Instrumentation (JINST)
Comment: 11 pages, 5 figures, To be published as proceeding to the 3rd European Conference on Plasma Diagnostics 2019 in Lisbon in the Proceedings Section of the Journal of Instrumentation (JINST)