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Improved motional Stark effect signal processing using fast Fourier transform spectral analysis.

M A Makowski1, B S Victor2

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A new Fast Fourier Transform (FFT) method enhances the Motional Stark Effect (MSE) system's frequency response tenfold. This advanced FFT technique improves polarization angle measurements in plasma diagnostics.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Data Analysis

Background:

  • The Motional Stark Effect (MSE) diagnostic is crucial for measuring plasma polarization angles in fusion devices.
  • Conventional analog lock-in amplifiers limit the frequency response of MSE systems.
  • Improving the frequency response is essential for analyzing dynamic plasma behavior.

Purpose of the Study:

  • To develop and validate a Fast Fourier Transform (FFT) based method for the MSE system.
  • To significantly enhance the frequency response compared to traditional analog lock-in methods.
  • To accurately determine polarization angles using FFT analysis of MSE signals.

Main Methods:

  • Implemented an FFT-based signal processing technique for MSE data.
  • Utilized rigorously derived analytic expressions to fit FFT spectral components.
  • Sampled the photo-multiplier tube detector output at 500 kHz.
  • Performed FFTs with as few as 100 data points.

Main Results:

  • Achieved a frequency response improvement of approximately a factor of 10 over analog lock-in methods.
  • The FFT method's frequency response is limited by fundamental measurement properties, reaching up to 5 kHz.
  • Accurately obtained amplitudes and phases of the 2f1 and 2f2 photo-elastic modulator frequencies.
  • Demonstrated a frequency response of 5 kHz for the DIII-D MSE system.

Conclusions:

  • The FFT-based method offers a substantial advancement in MSE system performance.
  • This technique provides a faster and more accurate way to measure plasma polarization angles.
  • The FFT method overcomes the limitations of low-pass filters found in analog systems.