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Simultaneous imaging/reflectivity measurements to assess diagnostic mirror cleaning
C H Skinner1, C A Gentile, R Doerner
1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA. cskinner@pppl.gov
The Review of Scientific Instruments
|November 7, 2012
Summary
A new method assesses mirror cleaning for ITER, ensuring plasma operations. It combines imaging and reflectivity tests to detect damage, even with hazardous materials like beryllium.
Area of Science:
- Materials Science
- Plasma Physics
- Optical Engineering
Background:
- Maintaining mirror reflectivity is crucial for ITER's plasma operations.
- Diagnostic mirrors require effective cleaning methods to ensure performance.
- Hazardous materials like beryllium necessitate safe handling and assessment techniques.
Purpose of the Study:
- To develop and validate a technique for assessing the efficacy of mirror cleaning methods.
- To detect surface damage on mirrors after cleaning processes.
- To ensure the suitability of cleaning methods for hazardous materials used in ITER.
Main Methods:
- Combined microscopic imaging and multi-spectral reflectivity measurements (RGB and specific wavelengths).
- Application to laser cleaning of single crystal molybdenum mirrors.
- Testing on mirrors coated with carbon or beryllium films (150-420 nm thick).
Main Results:
- The developed method effectively assesses mirror cleaning efficacy.
- Surface damage on mirrors can be detected using this technique.
- The method is suitable for hazardous materials like beryllium within a vacuum chamber.
Conclusions:
- The combined imaging and reflectivity measurement technique is a practical solution for ITER mirror maintenance.
- This method ensures diagnostic mirror performance and operational reliability.
- Safe and effective cleaning protocols for hazardous materials can be validated using this approach.
