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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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A frequency-modulated continuous-wave reflectometer for the Lithium Tokamak Experiment.

S Kubota¹, R Majeski², W A Peebles¹

¹Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

The Review of Scientific Instruments

|June 3, 2017

Summary

This summary is machine-generated.

A new frequency-modulated continuous-wave reflectometer on the Lithium Tokamak Experiment (LTX) accurately measures electron density profiles. Advanced data analysis techniques improve profile reconstruction and minimize signal artifacts for better plasma diagnostics.

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Area of Science:

Plasma Physics
Fusion Energy Research
Microwave Diagnostics

Background:

Accurate electron density measurements are crucial for understanding and controlling plasma behavior in fusion devices.
Previous diagnostic methods faced limitations in resolution and susceptibility to noise and artifacts.

Purpose of the Study:

To describe the frequency-modulated continuous-wave (FMCW) reflectometer diagnostic on the Lithium Tokamak Experiment (LTX).
To detail the data analysis methods for electron density profile determination.
To enhance the accuracy and reliability of plasma density measurements.

Main Methods:

Utilized an FMCW reflectometer operating in the 13.1-33.5 GHz range for electron densities of 0.21-1.4×10^13 cm^-3.
Implemented an optimized source frequency sweep to minimize signal variations from dispersive transmission lines.
Employed radar imaging for clutter removal and a weighted least-squares algorithm (POLAN) for profile reconstruction.

Main Results:

Achieved time resolution down to 8 μs for electron density profiles.
Successfully minimized artifacts in reflectometer signals through optimized design and data processing.
Demonstrated improved accuracy of reconstructed profiles through radar imaging and POLAN analysis.

Conclusions:

The developed FMCW reflectometer and analysis techniques provide reliable electron density profiles for LTX.
The methods presented offer best practices for minimizing signal artifacts in reflectometry.
Results were validated against Thomson scattering and interferometer measurements, confirming diagnostic accuracy.