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Updated: Jun 7, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Optimization studies of the ITER low field side reflectometer.

S J Diem¹, J B Wilgen, T S Bigelow

¹Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6169, USA. diemsj@ornl.gov

The Review of Scientific Instruments

|November 2, 2010

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Microwave reflectometry on ITER will monitor plasma density, turbulence, and transitions using O-mode and X-mode systems. This advanced diagnostic system is crucial for understanding fusion plasma behavior and optimizing reactor performance.

Area of Science:

Plasma Physics
Fusion Energy
Diagnostic Techniques

Background:

ITER requires advanced diagnostics for real-time plasma monitoring.
Microwave reflectometry is a key technique for measuring electron density profiles and fluctuations.

Purpose of the Study:

To detail the design and optimization of the ITER microwave reflectometry system.
To outline its capabilities for measuring core and edge plasma parameters.

Main Methods:

Utilizing O-mode (15-155 GHz) and X-mode (55-220 GHz) reflectometry systems.
Employing HE11 mode launchers with Gaussian beam propagation assumptions.
Conducting optimization studies with the GENRAY ray-tracing code for antenna coupling.

Main Results:

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Last Updated: Jun 7, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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Defined frequency ranges for core and edge measurements.
Investigated optimum launcher size and placement for effective coupling.
Established the system's capability for measuring density profiles, fluctuations, ELM transients, and L-H transitions.

Conclusions:

The ITER reflectometry system is designed for comprehensive plasma diagnostics.
Optimization studies ensure effective measurement of critical plasma parameters.
This system is vital for ITER's operational success and fusion energy research.