Tangential x-ray imaging crystal spectrometer on J-TEXT tokamak

Area of Science:

• Plasma Physics
• Fusion Energy Research
• X-ray Spectroscopy

Background:

• Accurate measurement of plasma properties like ion temperature and toroidal rotation velocity is critical for understanding and controlling fusion plasmas.
• The J-TEXT tokamak requires advanced diagnostic tools to probe these parameters effectively.

Purpose of the Study:

• To develop and implement a tangential X-ray Imaging Crystal Spectrometer (XICS) for the J-TEXT tokamak.
• To enable the measurement of ion temperature and plasma toroidal rotation velocity using XICS.

Main Methods:

• Utilized a spherically bent quartz crystal (2d = 4.913 Å) for spectral dispersion.
• Employed a multi-wire proportional counter for X-ray detection.
• Designed XICS for tangential observation (27°) of Ar XVII emission lines (3.94 Å-4.0 Å) with spatial resolution.

Main Results:

• Successfully developed a tangential XICS system for the J-TEXT tokamak.
• The system is capable of detecting Ar XVII resonance line and satellites.
• Achieved a spatial resolution of 3.1 cm in the vertical direction for plasma measurements.

Conclusions:

• The developed tangential XICS is a viable diagnostic tool for J-TEXT.
• This instrument provides essential data for ion temperature and toroidal rotation velocity measurements.
• The XICS contributes to advancing plasma diagnostics in fusion research.