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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

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System Validation Experiments for Obtaining Tracer Laser-Induced Fluorescence Data at Elevated Pressure and

Jason Hartwig¹, Gaurav Mittal², Kamal Kumar³

¹1 Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, USA.

Applied Spectroscopy

|November 23, 2017

Summary

This study validates experimental systems for high-pressure, high-temperature diagnostics. It quantifies factors affecting tracer measurements, ensuring reliable photophysical data and laser diagnostics.

Keywords:

Acetone LIF absorption laser-induced fluorescence photolysis pyrolysis

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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Area of Science:

Physical Chemistry
Spectroscopy
Laser Diagnostics

Background:

Accurate photophysical data and laser diagnostics require validated experimental systems.
High-pressure and high-temperature environments introduce complexities in data acquisition.
Uncertainty in data interpretation can arise from various experimental artifacts.

Purpose of the Study:

To present system validation experiments for static or flow systems.
To qualify systems for gathering tracer photophysical data and conducting laser diagnostics.
To establish design/operation limits and reduce uncertainty in high-pressure/temperature experiments.

Main Methods:

Quantified effects of tracer absorption at cell walls, stratification, photolysis, and pyrolysis.
Assessed adequacy of mixing, seeding, and reabsorption of laser light.
Utilized acetone as a tracer with 282 nm excitation in high-pressure/temperature conditions.

Main Results:

Acetone showed a 10% fluorescence signal decrease over 36,000 shots at 127.4 mJ/cm².
Photolysis was negligible below 1000 shots; pyrolysis and mixing issues mitigated by 100 ms residence time.
Tracer number density alteration due to thermal destruction was <0.5% with optimized residence time.

Conclusions:

The presented validation experiments effectively qualify systems for demanding conditions.
Identified and quantified key factors influencing tracer measurement accuracy.
Results provide a basis for reliable high-pressure/temperature photophysical data and laser diagnostics.