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Team improves spectral analysis and measurement of X-ray crystal spectroscopy for future fusion reactors

Spectral analysis and measurement of X-ray crystal spectroscopy improved for future fusion reactors
Inverted rotation velocity and ion temperature profiles by XCS compared with Charge Exchange Recombination Spectroscopy (XCRS). Credit: Lin Zichao

A research team led by Prof. Lyu Bo from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences has improved the diagnostic accuracy of X-ray Crystal Spectroscopy (XCS) and investigated a series of fusion reactor-related spectral lines on tungsten (W) and xenon (Xe) at the Experimental Advanced Superconducting Tokamak (EAST).

Rotation velocity and ion temperature profiles are fundamental to various physics studies. Currently, XCS on EAST can provide local radial profiles of the above parameters by analyzing argon (Ar) spectra with a newly developed inversion technique. However, as plasma parameters increase, Ar spectra will be insufficient for diagnostic purposes in the future.

The researchers conducted extensive research on the W spectra based on XCS, which enables the measurement of core plasma rotation velocity and ion temperature for fusion reactors. By optimizing the wavelength observation range of the diagnostic system, developing an inversion method for the W impurity radiation profile, and using in-situ intensity calibration techniques, the researchers obtained multiple related to W impurity.

Furthermore, one of the key physical and currently facing fusion research is how to control the W impurity concentration within an acceptable range. Physical experiments focused on W impurity control were performed on the EAST facility. The above method allowed for the direct observation of the mitigating effect of radiofrequency core heating on impurity accumulation.

Spectral analysis and measurement of X-ray crystal spectroscopy improved for future fusion reactors
Left: Typical spectral lines measured by the XCS on EAST. Right: The impurity density profiles of W44+. Credit: Lin Zichao

In addition, a feasibility study was conducted to measure the high-parameter plasma ion temperature and rotation velocity by analyzing the Xe spectral profiles. First, the feasibility was confirmed by the atomic physics simulation program. Then, Xe spectral lines consistent with theoretical predictions were measured for the first time in the EAST physics experiment, allowing the determination of ion temperature and other ionization parameters through Xe impurity spectral line analysis.

These studies were published in the journals Plasma Science and Technology, Physics of Plasmas, Nuclear Fusion, and Review of Scientific Instruments.

Overall, this work contributes to the advancement of plasma physics research, enhances the XCS diagnostic capabilities on EAST, and provides valuable insights into the XCS diagnostics of plasma in 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 15 June 2024 from https://phys.org/news/2023-06-team-spectral-analysis-x-ray-crystal.html
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