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A remote gain controlled and polarization angle tunable Doppler backward scattering reflectometer.

J Wen¹, Z B Shi¹, W L Zhong¹

¹Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

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|July 10, 2021

Summary

This study developed a remote control system for multichannel Doppler backward scattering (DBS) reflectometers, enhancing plasma diagnostics in fusion devices. The system enables precise control of quasi-optical components and amplifier gain for improved performance.

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Area of Science:

Plasma physics
Fusion energy research
Advanced diagnostic systems

Background:

High-performance plasma operation in fusion devices requires remote control of diagnostic systems.
Doppler backward scattering (DBS) reflectometry is a key diagnostic technique for plasma measurement.
Existing systems may lack efficient remote control capabilities for complex diagnostics.

Purpose of the Study:

To develop a comprehensive remote control system for multichannel DBS reflectometers.
To enhance the performance and reliability of plasma diagnostics in fusion devices.
To enable precise adjustment of optical and electronic components for optimal data acquisition.

Main Methods:

Development of a remote-controlled quasi-optical system featuring a tunable rotational polarizer.
Implementation of a remote intermediate frequency (IF) amplifier gain control system using microcontroller (MCU) technology.
Integration of Ethernet-based remote control and a local control interface for system management.

Main Results:

The developed system effectively combines microwave beams across a wide frequency range using the quasi-optical system.
The remote IF gain control system successfully regulates signal amplitude for each channel in real-time.
Preliminary experiments confirm the effectiveness and reliability of the remote-controlled multichannel DBS system.

Conclusions:

The developed remote control system significantly improves the operational capabilities of multichannel DBS reflectometers.
This advancement facilitates high-performance plasma operation and reliable data acquisition in fusion devices.
The system offers flexible control options, enhancing its applicability in various experimental setups.