A research team led by Prof. Lyu Bo from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences has made significant advancements in the diagnostic accuracy of X-ray Crystal Spectroscopy (XCS). They conducted experiments at the Experimental Advanced Superconducting Tokamak (EAST) to investigate fusion reactor-related spectral lines on tungsten (W) and xenon (Xe).
The measurement of rotation velocity and ion temperature profiles is crucial for plasma physics studies. While XCS on EAST can currently analyze argon (Ar) spectra to provide local radial profiles of these parameters, it becomes insufficient as plasma parameters increase in the future.
The research team focused on improving the diagnostic capabilities of XCS for fusion reactors by conducting extensive research on the spectra of tungsten (W) impurities. They optimized the wavelength observation range, developed an inversion method for W impurity radiation profiles, and used in-situ intensity calibration techniques to obtain multiple spectral lines related to W impurity.
Furthermore, the researchers performed physical experiments on the EAST facility to address the challenge of controlling the concentration of W impurities within acceptable limits. They directly observed the mitigating effect of radiofrequency core heating on impurity accumulation.
In addition, the researchers conducted a feasibility study on analyzing xenon (Xe) spectral profiles to measure high-parameter plasma ion temperature and rotation velocity. They confirmed the feasibility through atomic physics simulation programs and measured Xe spectral lines consistent with theoretical predictions in EAST experiments. This allowed for the determination of ion temperature and other ionization parameters through Xe impurity spectral line analysis.
The results of these studies were published in prestigious journals such as Plasma Science and Technology, Physics of Plasmas, Nuclear Fusion, and Review of Scientific Instruments.
This groundbreaking work not only advances plasma physics research but also enhances the diagnostic capabilities of XCS on EAST. It provides valuable insights into the XCS diagnostics of plasma in the context of fusion reactor scenarios.
More information:
Zichao Lin et al, Inversion techniques to obtain local rotation velocity and ion temperature profiles for the x-ray crystal spectrometer on EAST, Plasma Science and Technology (2023). DOI: 10.1088/2058-6272/acc503
Z. C. Lin et al, Preliminary observation of tungsten-impurity suppression using on-axis ECRH by X-ray crystal spectroscopy in EAST, Physics of Plasmas (2023). DOI: 10.1063/5.0131596
Dian Lu et al, Observations of xenon spectra on the EAST x-ray crystal spectrometer for high-temperature plasma diagnostics, Nuclear Fusion (2023). DOI: 10.1088/1741-4326/acbdae
Dian Lu et al, Design consideration of an x-ray imaging crystal spectrometer for China Fusion Engineering Test Reactor, Review of Scientific Instruments (2021). DOI: 10.1063/5.0040527
Liang He et al, Measurement of tungsten impurity spectra with a two-crystal X-ray crystal spectrometer on EAST, Plasma Science and Technology (2020). DOI: 10.1088/2058-6272/ab84ee
Citation:
Team improves spectral analysis and measurement of X-ray crystal spectroscopy for future fusion reactors (2023, June 27)
retrieved 27 June 2023
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