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Updated: Mar 7, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

Published on: April 16, 2017

Note: Improved heater design for high-temperature hollow cathodes.

M S McDonald¹, A D Gallimore², D M Goebel³

¹Spacecraft Engineering Department, Naval Research Laboratory, Washington, DC 20375, USA.

The Review of Scientific Instruments

|March 3, 2017

Summary

This summary is machine-generated.

A new rhenium-boron nitride heater design reliably ignites lanthanum hexaboride (LaB6) hollow cathodes. This durable heater shows no filament degradation after hundreds of hours, even at high operating temperatures.

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Last Updated: Mar 7, 2026

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Area of Science:

Materials Science
Plasma Physics
Vacuum Technology

Background:

Thermionic cathodes require specialized heaters for operation.
Existing heater designs face limitations in durability and temperature resistance.
Lanthanum hexaboride (LaB6) hollow cathodes demand high operating temperatures.

Purpose of the Study:

To present an improved heater design for thermionic cathodes.
To evaluate the performance and durability of a rhenium-boron nitride heater.
To compare the new design with existing cathode heater technologies.

Main Methods:

Fabrication of a heater using a rhenium filament within a boron nitride ceramic sleeve.
Testing the heater's performance with a lanthanum hexaboride (LaB6) hollow cathode.
Operating the heater under vacuum with an inert gas discharge.

Main Results:

The rhenium-boron nitride heater reliably and repeatably ignited the LaB6 hollow cathode.
No noticeable filament degradation was observed over hundreds of hours of operation.
The heater materials (boron nitride and rhenium) possess high decomposition and melting points suitable for high-temperature applications.

Conclusions:

The developed heater design is simple to fabricate and highly durable.
The rhenium-boron nitride heater is an attractive option for high-temperature LaB6 hollow cathode applications.
This design overcomes limitations of current state-of-the-art cathode heaters.