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Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

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A next generation ultra short pulse reflectometry (USPR) diagnostic.

C W Domier¹, Y Zhu¹, J Dannenberg¹

¹Department of Electrical and Computer Engineering, University of California at Davis, Davis, California 95616, USA.

The Review of Scientific Instruments

|April 6, 2021

Summary

A new ultrashort pulse reflectometry (USPR) system enhances plasma diagnostics for fusion energy research. This advanced technique offers faster measurements and improved performance for magnetically confined fusion devices.

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Area of Science:

Plasma physics
Fusion energy research
Advanced diagnostics

Background:

Ultrashort Pulse Reflectometry (USPR) is a plasma diagnostic technique.
It relies on analyzing the propagation and reflection of ultrashort chirped pulses.
Existing systems have limitations in performance and application scope.

Purpose of the Study:

To develop a next-generation USPR system for compact, short-duration, magnetically confined fusion devices.
To significantly enhance diagnostic performance compared to previous systems.
To enable more precise and efficient plasma measurements.

Main Methods:

Development of a new USPR system operating in the 28-75 GHz range.
Replacement of upconverting mixers with high-power active multiplier chains for mm-wave chirp generation.
Implementation of custom time-of-flight electronics for faster measurements.
Integration of a field-programmable gate array (FPGA) for data acquisition and analysis.

Main Results:

The new system demonstrates a dramatic increase in performance.
Measurement time per channel is reduced by a factor of 3X.
The system is capable of generating higher power mm-wave transmitter chirps.

Conclusions:

The next-generation USPR system represents a significant advancement in plasma diagnostic capabilities.
This technology is well-suited for current and future compact fusion devices.
The enhanced performance and speed will accelerate fusion energy research.