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Collective Thomson scattering diagnostic at Wendelstein 7-X
D Moseev1, M Stejner2, T Stange1
1Max-Planck-Institut für Plasmaphysik, Greifswald and Garching, Germany.
The Review of Scientific Instruments
|February 3, 2019
Summary
A new Collective Thomson Scattering (CTS) diagnostic measures ion temperatures in Wendelstein 7-X plasma core using electron cyclotron resonance heating gyrotrons. This system shares a long transmission line, enabling crucial plasma physics research.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Diagnostic Technology
Background:
- Accurate ion temperature measurements are critical for understanding and controlling fusion plasmas.
- The Wendelstein 7-X stellarator requires advanced diagnostics for core plasma characterization.
- Existing methods may have limitations in plasma core accessibility or resolution.
Purpose of the Study:
- To introduce and detail the design, installation, and alignment of a Collective Thomson Scattering (CTS) diagnostic at Wendelstein 7-X.
- To enable in-situ ion temperature measurements within the plasma core.
- To validate the performance of the CTS system with initial experimental data.
Main Methods:
- Utilizing 140 GHz gyrotrons, typically for Electron Cyclotron Resonance Heating (ECRH), as the radiation source for CTS.
- Employing a shared quasi-optical transmission line exceeding 40 meters in length.
- Implementing precise alignment procedures for the diagnostic components within the experimental setup.
Main Results:
- Successful installation and alignment of the CTS diagnostic system.
- Acquisition of initial measurement data from the Wendelstein 7-X plasma core.
- Demonstration of the CTS diagnostic's capability for ion temperature profiling.
Conclusions:
- The Collective Thomson Scattering diagnostic is operational at Wendelstein 7-X.
- The shared transmission line design is feasible and effective.
- The CTS diagnostic provides valuable data for plasma core physics studies.
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