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Phased array Doppler reflectometry at Wendelstein 7-X.

T Windisch1, S Wolf2, G M Weir1

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This summary is machine-generated.

A new phased array Doppler reflectometry system on the Wendelstein-7X stellarator allows rapid microwave beam steering without mechanical parts. This enables faster plasma measurements for improved fusion energy research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Stellarator technology

Background:

  • Wendelstein-7X (W7-X) stellarator is a leading fusion energy experiment.
  • Doppler reflectometry is crucial for diagnosing plasma properties.
  • Conventional systems have limitations in beam steering speed.

Purpose of the Study:

  • To introduce and characterize a novel passive phased array Doppler reflectometry system for W7-X.
  • To evaluate the system's capability for rapid, non-mechanical microwave beam steering.
  • To present initial measurement results from the OP1.2a campaign.

Main Methods:

  • Installation of a passive phased array antenna system on W7-X.
  • Characterization of the antenna's design and electromagnetic properties.
  • Utilizing the phased array for microwave beam steering in the plane perpendicular to the magnetic field (±25°).
  • Data acquisition during the OP1.2a experimental campaign.

Main Results:

  • Successful installation and characterization of the phased array system.
  • Demonstration of microwave beam steering on short time scales (±25°) without mechanical components.
  • Acquisition of first measurement data from the W7-X plasma during OP1.2a.

Conclusions:

  • The phased array Doppler reflectometry system offers advanced capabilities for W7-X plasma diagnostics.
  • Rapid beam steering enhances the potential for dynamic plasma profile measurements.
  • The system is a valuable addition to W7-X diagnostic tools for fusion research.