Design of practical alignment device in KSTAR Thomson diagnostic

Area of Science:

• Plasma physics
• Fusion energy research
• Optical diagnostics

Background:

• Accurate electron temperature and density measurements are crucial for tokamak fusion devices.
• The KSTAR tokamak's Thomson scattering diagnostic system previously lacked a dedicated alignment detection system.
• Existing alignment fibers in the optical collection modules were insufficient for precise alignment verification.

Purpose of the Study:

• To develop and present a novel alignment detection device for the KSTAR Thomson scattering system.
• To address the limitations of previous alignment methods in ensuring precise optical alignment.
• To enhance the accuracy of electron temperature and density measurements in tokamak experiments.

Main Methods:

• Development of an alignment detection device utilizing two distinct filters: a narrow bandpass filter for the laser and a broad filter for the Thomson scattering signal.
• Integration of four alignment detection devices into the KSTAR Thomson scattering system.
• Design focused on verifying alignment between the laser path and the collection optics' object field.

Main Results:

• Successful development of four alignment detection devices for the KSTAR Thomson scattering system.
• The developed device effectively distinguishes between laser and Thomson scattering wavelengths using specific filters.
• The devices are prepared for testing in KSTAR experiments in 2016.

Conclusions:

• The newly developed alignment detection device is a significant advancement for KSTAR's Thomson scattering diagnostics.
• This system is expected to improve the reliability and accuracy of plasma measurements.
• The successful development paves the way for enhanced fusion energy research through precise diagnostics.