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A 60-GHz interferometer with a local oscillator integrated antenna array for divertor simulation experiments on GAMMA

J Kohagura¹, M Yoshikawa¹, X Wang²

¹Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.

The Review of Scientific Instruments

|December 3, 2016

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We developed a novel 60-GHz interferometer using a local oscillator integrated antenna array (LIA) for simpler, uniform local oscillator (LO) signal distribution. This new system simplifies microwave diagnostics by replacing expensive components with integrated circuits.

Area of Science:

Plasma Physics
Microwave Diagnostics
Fusion Energy Research

Background:

Conventional microwave diagnostics (interferometry, reflectometry, electron cyclotron emission) rely on complex LO signal distribution via optics.
Existing systems often require expensive high-frequency sources (e.g., 60-GHz) and waveguide transmission lines.

Purpose of the Study:

To introduce a novel 60-GHz interferometer system featuring a local oscillator integrated antenna array (LIA).
To simplify and improve the uniformity of local oscillator (LO) signal supply to receiver arrays in microwave diagnostics.

Main Methods:

Development of an eight-channel receiver array (LIA) incorporating a frequency quadrupler integrated circuit for each channel.
Utilizing a single 15-GHz LO source and coaxial cable transmission for LO signal distribution.

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Application of the new interferometer system to measure electron line-averaged density in the D-module of the GAMMA 10/PDX tandem mirror device.

Main Results:

The LIA enables a simplified and uniform LO supply to the receiver array.
Eliminates the need for expensive 60-GHz sources, LO optics, and waveguide transmission lines.
Successfully applied to measure electron density in a fusion plasma experiment.

Conclusions:

The local oscillator integrated antenna array (LIA) offers a cost-effective and efficient solution for LO signal distribution in microwave diagnostics.
This innovation facilitates advanced plasma measurements in devices like the GAMMA 10/PDX tandem mirror.
The LIA system represents a significant advancement in the design of microwave diagnostic systems for fusion research.