X-ray crystal spectrometer upgrade for ITER-like wall experiments at JET

Area of Science:

• Plasma Physics
• Spectroscopy
• Fusion Energy Research

Background:

• The Joint European Torus (JET) tokamak recently installed an ITER-like wall, featuring beryllium in the main chamber and tungsten in the divertor.
• Understanding tungsten impurity accumulation is critical for optimizing plasma performance and operational stability in fusion devices.

Purpose of the Study:

• To detail the upgrades made to the high-resolution X-ray crystal spectrometer at JET.
• To enhance the measurement of tungsten impurity concentrations within the tokamak plasma.
• To support plasma parameter calculations and spectral analysis for fusion research.

Main Methods:

• Upgrading the high-resolution X-ray crystal spectrometer system.
• Developing methods for precise spectral analysis of tokamak plasma.
• Calibrating the spectrometer's sensitivity for accurate impurity concentration determination.

Main Results:

• The upgraded spectrometer is optimized for measuring tungsten impurity concentrations.
• Detailed procedures for spectral analysis and plasma parameter calculation are established.
• Spectrometer sensitivity determination is described, crucial for quantitative impurity measurements.

Conclusions:

• The upgraded X-ray crystal spectrometer significantly improves the capability to monitor tungsten impurities at JET.
• This advancement aids in understanding plasma-wall interactions and impurity transport in fusion devices.
• The work provides essential data for the operational optimization of fusion reactors.