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Improved filters for angular filter refractometry
P V Heuer1, D Haberberger1, S T Ivancic1
1University of Rochester Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1299, USA.
The Review of Scientific Instruments
|February 11, 2024
Summary
This study introduces an improved angular filter refractometry design using a stochastic pixel pattern to reduce diffraction. A novel technique with paired filters resolves density gradient sign degeneracy in plasma diagnostics.
Area of Science:
- Plasma physics
- Optical diagnostics
Background:
- Angular filter refractometry (AF) measures line-integrated density gradients in plasma.
- Current AF methods struggle with diffraction and density gradient sign degeneracy.
Purpose of the Study:
- To present an improved AF design minimizing diffraction.
- To introduce a technique for resolving density gradient sign ambiguity.
Main Methods:
- Developed a novel AF with a stochastic pixel pattern and sinusoidal radial profile.
- Implemented a dual-AF system on separate probe beam branches.
- Validated techniques using synthetic diagnostics and OMEGA EP laser data.
Main Results:
- The stochastic pattern significantly reduced unwanted diffraction effects.
- The paired AF technique successfully broke density gradient degeneracy.
- Demonstrated the effectiveness of both advancements in real-world plasma conditions.
Conclusions:
- The improved AF design enhances data accuracy in plasma density measurements.
- The dual-AF technique provides a robust solution for resolving gradient ambiguities.
- These advancements offer significant improvements for optical diagnostics in plasma research.
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