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Upgrading a high-throughput spectrometer for high-frequency (<400 kHz) measurements
T Nishizawa1, M D Nornberg1, D J Den Hartog1
1University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
The Review of Scientific Instruments
|December 3, 2016
Summary
An upgraded spectrometer for charge exchange recombination spectroscopy can now resolve faster fluctuations. This improvement, achieved by adjusting amplifier settings and modeling signal processing, enhances data accuracy for fusion plasma research.
Area of Science:
- Plasma Physics
- Spectroscopy
- Fusion Energy Research
Background:
- Charge exchange recombination spectroscopy (CXRS) is crucial for diagnosing fusion plasmas.
- Previous CXRS systems on the Madison Symmetric Torus (MST) had limitations in resolving fast temporal fluctuations.
- Accurate measurement of photon counts is essential for reliable plasma parameter determination.
Purpose of the Study:
- To upgrade the CXRS spectrometer on the MST to resolve faster emission fluctuations.
- To improve the accuracy of photon counting rate measurements in dynamic plasma conditions.
- To quantify and minimize uncertainties in the CXRS diagnostic signal processing.
Main Methods:
- Increased the cutoff frequency of the transimpedance amplifier based on signal processing simulations.
- Modeled each stage of the diagnostic's signal processing to quantify uncertainty.
- Scanned filtering frequencies and calibrated photon counting rates using a DC light source.
Main Results:
- The upgraded spectrometer can resolve emission fluctuations up to 400 kHz.
- Modeling demonstrated that uncertainties in photon counting rate can be calculated.
- Calibration with a DC light source effectively addressed additional variations in measurements.
Conclusions:
- The spectrometer upgrade significantly enhances the temporal resolution of CXRS measurements on the MST.
- The developed modeling approach provides a method for quantifying and managing signal processing uncertainties.
- These advancements contribute to more precise plasma diagnostics in fusion research.
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