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Modifications to the synthetic aperture microwave imaging diagnostic.

K J Brunner¹, J C Chorley¹, N A Dipper¹

¹Department of Physics-Durham University, South Road, Durham DH1 3LE, United Kingdom.

The Review of Scientific Instruments

|December 3, 2016

Summary

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The synthetic aperture microwave imaging diagnostic, crucial for plasma research, has been enhanced for 2D Doppler back-scattering and pitch angle measurements. This upgraded system is now operational on multiple fusion experiments.

Area of Science:

Plasma physics
Fusion energy research
Microwave diagnostics

Background:

The synthetic aperture microwave imaging diagnostic has been operational on the Mega Ampere Spherical Tokamak (MAST) experiment since 2011.
It has successfully provided the first 2D images of B-X-O mode conversion windows.
The diagnostic demonstrated the feasibility of 2D Doppler back-scattering (DBS) experiments.

Purpose of the Study:

To modify and enhance the synthetic aperture microwave imaging diagnostic.
To enable new measurement capabilities including pitch angle profile measurements and O and X mode separation.
To facilitate continuous acquisition of 2D DBS data.

Main Methods:

Utilizing field programmable gate arrays (FPGAs) for data processing.

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Implementing modifications based on operational experience from MAST.

Installing and configuring the enhanced diagnostic on the National Spherical Torus Experiment Upgrade (NSTX-U).

Main Results:

The enhanced diagnostic enables pitch angle profile measurements.
It allows for O and X mode separation.
Continuous acquisition of 2D DBS data is now possible.

Conclusions:

The modifications have significantly improved the capabilities of the synthetic aperture microwave imaging diagnostic.
The enhanced diagnostic is a valuable tool for fusion plasma research, now operational on both MAST and NSTX-U.
The system's advancements support detailed plasma diagnostics for future fusion energy development.