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

Wendelstein 7-X Team

doi:10.1088/1748-0221/14/09/C09037

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

Wendelstein 7-X Team

Power Exhaust and Particle Control

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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.

Original language	English
Article number	C09037
Journal	Journal of Instrumentation
Volume	14
Issue number	9
DOIs	https://doi.org/10.1088/1748-0221/14/09/C09037
State	Published - Sep 20 2019

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
Horizon 2020 Framework Programme	633053
H2020 Euratom	2014-2018, 2019-2020

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1748-0221/14/09/C09037

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title = "First results from an event synchronized-high repetition Thomson scattering system at Wendelstein 7-X",

abstract = "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.",

author = "{Wendelstein 7-X Team} and H. Damm and E. Pasch and A. Dinklage and J. Baldzuhn and Bozhenkov, {S. A.} and Brunner, {K. J.} and F. Effenberg and G. Fuchert and J. Geiger and Harris, {J. H.} and J. Knauer and P. Kornejew and T. Kremeyer and M. Krychowiak and J. Schilling and O. Schmitz and Scott, {E. R.} and V. Winters",

note = "Publisher Copyright: {\textcopyright} 2019 Max Planck Institute for Plasma Physics. Published by IOP Publishing Ltd on behalf of Sissa Medialab.",

year = "2019",

month = sep,

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doi = "10.1088/1748-0221/14/09/C09037",

language = "English",

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T1 - First results from an event synchronized-high repetition Thomson scattering system at Wendelstein 7-X

AU - Wendelstein 7-X Team

AU - Damm, H.

AU - Pasch, E.

AU - Dinklage, A.

AU - Baldzuhn, J.

AU - Bozhenkov, S. A.

AU - Brunner, K. J.

AU - Effenberg, F.

AU - Fuchert, G.

AU - Geiger, J.

AU - Harris, J. H.

AU - Knauer, J.

AU - Kornejew, P.

AU - Kremeyer, T.

AU - Krychowiak, M.

AU - Schilling, J.

AU - Schmitz, O.

AU - Scott, E. R.

AU - Winters, V.

PY - 2019/9/20

Y1 - 2019/9/20

N2 - 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.

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

Abstract

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UN SDGs

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