Measurement of helium-like and hydrogen-like argon spectra using double-crystal X-ray spectrometers on EAST
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
- National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026 (China)
- Hefei Science Center, Chinese Academy of Sciences, Hefei 230031 (China)
A two-crystal assembly was deployed on the tangential X-ray crystal spectrometer to measure both helium-like and hydrogen-like spectra on EAST. High-quality helium-like and hydrogen-like spectra were observed simultaneously for the first time on one detector for a wide range of plasma parameters. Profiles of line-integrated core ion temperatures inferred from two spectra were consistent. Since tungsten was adopted as the upper divertor material, one tungsten line (W XLIV at 4.017 Å) on the short-wavelength side of the Lyman-α line (Lα1) was identified for typical USN discharges, which was diffracted by a He-like crystal (2d = 4.913 Å). Another possible Fe XXV line (1.85 Å) was observed to be located on the long-wavelength side of resonance line (w), which was diffracted from a H-like crystal (2d = 4.5622 Å) on the second order. Be-like argon lines were also observable that fill the detector space between the He-like and H-like spectra.
- OSTI ID:
- 22596459
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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