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Optimized collection optic design for divertor Thomson scattering diagnostics in KSTAR.

G H Park^1,2, H J Kim¹, J H Lee^1,2

¹KSTAR Research Center, Korea Institute of Fusion Energy, Daejeon 34113, South Korea.

The Review of Scientific Instruments

|July 29, 2024

Summary

Optimizing collection optics for KSTAR’s tungsten divertor Thomson scattering diagnostics is crucial. The study compares Cooke-triplet and double-Gaussian designs to improve electron temperature and density measurements.

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Area of Science:

Plasma physics
Fusion energy research
Optical engineering

Background:

KSTAR tokamak transitioned to tungsten divertor tiles.
Accurate electron temperature and density measurements are vital for fusion research.
Previous diagnostic designs faced limitations with stray light and spatial constraints.

Purpose of the Study:

To optimize the collection optic design for KSTAR's divertor Thomson scattering diagnostics.
To enhance electron temperature and density profile measurements in the new tungsten divertor.
To mitigate stray light issues inherent in the KSTAR divertor environment.

Main Methods:

Investigated two collection optic designs: Cooke-triplet and double-Gaussian.
Utilized ray tracing analysis to evaluate optical performance.
Focused on diagnostics for electron temperature (1-100 eV) and electron density (1x10^18-1x10^19 m^-3).

Main Results:

Presented ray tracing analysis for both Cooke-triplet and double-Gaussian optic designs.
Identified performance characteristics of each design under KSTAR divertor conditions.
Determined the optimal collection optic design for improved diagnostic accuracy.

Conclusions:

The choice of collection optic design significantly impacts the performance of divertor Thomson scattering diagnostics.
An optimized design is essential for reliable electron temperature and density measurements in the KSTAR tungsten divertor.
Further development focuses on the superior performing design for future KSTAR operations.