Design and fabrication of a multi-purpose soft x-ray array diagnostic system for KSTAR

Area of Science:

• Plasma physics
• Fusion energy research
• Diagnostic instrumentation

Background:

• Accurate measurement of plasma parameters is crucial for fusion energy research.
• Existing diagnostic systems may lack multi-functionality or require complex operation.
• Understanding impurity transport and radiation power is essential for plasma confinement.

Purpose of the Study:

• To develop a versatile soft x-ray diagnostic system for comprehensive plasma analysis.
• To enable in-situ measurement of electron temperature, Ar impurity transport, and radiation power.
• To integrate a remotely controlled filter system for flexible data acquisition.

Main Methods:

• Development of a multi-purpose soft x-ray array diagnostic system.
• Implementation of a remotely controlled filter wheel with three filter options.
• Utilizing beryllium (Be) filters for electron temperature profiling.
• Employing Ar Ross filters (CaF(2) and NaCl) for argon impurity transport analysis.
• Configuring the system as a bolometer by removing filters for total radiation power measurement.

Main Results:

• Successful development of a system capable of measuring 2D x-ray emissivity profiles.
• Demonstrated capability to determine electron temperature profiles using differential Be filters.
• Validated method for assessing Ar impurity concentration transport with Ar Ross filters.
• Established the system's functionality as a bolometer for total radiation power measurements.

Conclusions:

• The developed soft x-ray diagnostic system offers a multi-functional approach to plasma characterization.
• This versatile instrument enhances the ability to study electron temperature, impurity transport, and radiation losses.
• The system provides a valuable tool for fusion research, improving plasma diagnostics and understanding.