The first experimental results from W divertor utilizing x-ray imaging crystal spectrometer on KSTAR

Area of Science:

• Plasma physics
• Atomic spectroscopy
• Fusion energy research

Background:

• The Korea Superconducting Tokamak Advanced Research (KSTAR) utilizes advanced diagnostic tools for plasma analysis.
• Accurate measurement of high-Z ion charge states is crucial for understanding plasma behavior in fusion devices.

Purpose of the Study:

• To demonstrate the capability of the X-ray Imaging Crystal Spectrometer (XICS) for multi-state ion measurement.
• To report initial experimental results from KSTAR following the installation of full Tungsten (W) tiles in the lower divertor.

Main Methods:

• Utilizing the X-ray Imaging Crystal Spectrometer (XICS) with a fixed spectrometer configuration.
• Measuring spectral lines from highly charged ions of Argon (Ar) and Tungsten (W).
• Analyzing spectral data to identify and quantify different atomic states (e.g., Ar16+, Ar17+, W43+, W44+).

Main Results:

• XICS effectively measured multiple atomic states of Ar and W ions without reconfiguring the spectrometer.
• Observed spectral lines were well-separated within the detector's boundary, confirming measurement accuracy.
• First experimental data obtained with the newly installed full W tiles in the KSTAR lower divertor were successfully acquired.

Conclusions:

• The XICS is a versatile instrument capable of measuring various atomic states in tokamak plasmas.
• The results validate the performance of XICS in the KSTAR environment, especially with the new divertor configuration.
• This work provides baseline spectroscopic data for future studies on Tungsten transport and plasma-wall interactions in KSTAR.