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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

A multichannel, frequency-modulated, tunable Doppler backscattering and reflectometry system.

J C Hillesheim¹, W A Peebles, T L Rhodes

¹Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, California 90095-1547, USA. jchillesheim@physics.ucla.edu

The Review of Scientific Instruments

|September 4, 2009

Summary

This summary is machine-generated.

A new Doppler backscattering system measures plasma turbulence and velocity in fusion devices like DIII-D and NSTX. This technology aids in understanding complex plasma behavior for fusion energy research.

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic techniques

Background:

Understanding plasma turbulence is crucial for magnetic confinement fusion.
Previous methods had limitations in measuring localized turbulence and propagation velocity.

Purpose of the Study:

To design and test a novel multichannel Doppler backscattering system.
To measure localized intermediate wavenumber density fluctuations and propagation velocity.
To apply the system to DIII-D and NSTX fusion plasma devices.

Main Methods:

Utilized Doppler backscattering with microwave radiation near a plasma cutoff layer.
Employed Bragg backscattering for fluctuations with specific wavenumbers.
Used ray tracing simulations to determine scattering location and wavenumber.
Implemented frequency modulation and multiplication for a tunable microwave frequency array (53-78 GHz).

Main Results:

Successfully designed and tested a multichannel Doppler backscattering system.
Demonstrated capability to measure localized density fluctuations and turbulence propagation velocity.
Initial data acquisition from DIII-D plasmas.

Conclusions:

The developed system is a viable tool for diagnosing plasma turbulence in fusion devices.
Provides localized measurements of density fluctuations and propagation velocity.
Paves the way for advanced plasma control and understanding in fusion research.