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Related Experiment Video

Updated: Jun 27, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

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Published on: September 26, 2014

Radial density profile measurement by using the multichannel microwave interferometer in GAMMA 10.

M Yoshikawa¹, T Matsumoto, Y Shima

¹Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan. yosikawa@prc.tsukuba.ac.jp

The Review of Scientific Instruments

|December 3, 2008

Summary

This study presents a multichannel microwave interferometer for measuring plasma electron density and fluctuations. The system successfully captures radial density profiles in a single plasma shot.

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Last Updated: Jun 27, 2026

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Area of Science:

Plasma Physics
Fusion Energy Research

Background:

Accurate measurement of plasma density is crucial for understanding fusion plasmas.
Existing methods may require multiple shots or complex setups.

Purpose of the Study:

To develop and demonstrate a novel multichannel microwave interferometer.
To enable single-shot radial plasma electron density and fluctuation measurements.

Main Methods:

Reconstruction of a multichannel microwave interferometer.
Utilized transmission horn repositioning and a Teflon lens.
Achieved radial profile measurements within a single plasma discharge.

Main Results:

Successfully measured the radial plasma electron density profile.
Successfully measured plasma density fluctuation spectra.
Demonstrated capability for single-shot measurements.

Conclusions:

The reconstructed interferometer system is effective for comprehensive plasma density diagnostics.
This advancement facilitates efficient data acquisition in fusion research.