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2D microwave imaging reflectometer electronics.

A G Spear1, C W Domier1, X Hu1

  • 1Electrical & Computer Engineering, University of California, Davis, California 95616, USA.

The Review of Scientific Instruments
|November 29, 2014
PubMed
Summary
This summary is machine-generated.

A new 2D microwave imaging reflectometer visualizes plasma electron density fluctuations on the DIII-D tokamak. This system uses multiple frequencies and optics to capture detailed 2D images of these critical plasma dynamics.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Microwave Diagnostics

Background:

  • Understanding electron density fluctuations is crucial for controlling plasma stability in fusion devices like tokamaks.
  • Previous diagnostic methods had limitations in spatial resolution and temporal coverage.

Purpose of the Study:

  • To develop and detail a 2D microwave imaging reflectometer system for visualizing electron density fluctuations.
  • To provide high-resolution, spatially resolved data on plasma behavior in the DIII-D tokamak.

Main Methods:

  • Utilizing a 2D microwave imaging reflectometer system with four simultaneous probe frequencies.
  • Employing large aperture optics to image reflections from density-dependent cutoff surfaces.
  • Processing in-phase (I) and quadrature (Q) reflectometer signals from receiver down conversion electronics.

Main Results:

  • Successful generation of 2D images of electron density fluctuations over an extended plasma region.
  • Demonstration of localized density fluctuations modulating plasma reflections near cutoff surfaces.
  • Detailed presentation of the control system, backplane, and computer control program.

Conclusions:

  • The developed 2D microwave imaging reflectometer system effectively visualizes electron density fluctuations.
  • The system provides valuable data for studying plasma dynamics and improving fusion reactor performance.
  • The detailed electronics and control system facilitate robust and reliable plasma diagnostics.