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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.

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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.

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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.