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Imaging interferometers for analysis of Thomson scattered spectra
1Plasma Research Laboratory, Australian National University, Canberra, Australian Capital Territory 0200, Australia.
The Review of Scientific Instruments
|December 3, 2008
Summary
High-efficiency imaging polarization interferometers offer advantages for Thomson scattering spectral analysis. Designs using crystal polarizing beamsplitters provide low-loss, wide-field imaging for fusion plasma diagnostics.
Area of Science:
- Plasma Physics
- Optical Engineering
Background:
- Thomson scattering is a key diagnostic for measuring plasma properties.
- Existing spectral analysis methods can have efficiency limitations.
Purpose of the Study:
- To present designs for high-efficiency imaging polarization interferometers.
- To assess configurations for Thomson scattering spectral analysis on the JT-60U system.
Main Methods:
- Utilizing high-efficiency crystal polarizing beamsplitters (displacement and angle).
- Designing systems with low-loss complementary passbands and simple imaging.
- Employing optical fiber bundles to transfer light to an intensified CCD camera.
Main Results:
- Achieved low-loss complementary passbands and wide field of view.
- Enabled compact multicolor or dispersive systems due to small optical delays.
- Designs are suitable for broadband Thomson scattered light analysis.
Conclusions:
- Imaging polarization interferometers present an efficient approach for Thomson scattering spectral analysis.
- The developed designs offer practical advantages for fusion plasma diagnostics.
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