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- W2028786908 abstract "A two channel multicrystal spectrometer of Bragg geometry was constructed for measurements of absolute photon fluxes of ASDEX Upgrade plasmas in the wavelength range from 0.5 up to 26 Å. The calibration of the spectrometer was done by an ab initio calculation using the absolute reflection data from literature of four crystals. The calibration was validated by the direct comparison with other absolute calibrated diagnostics at the ASDEX Upgrade as well as by using the impurity transport code STRAHL. The absolute impurity concentrations of elements from N up to Cu have been extracted. O and F appear to be main impurity components after C, which is routinely measured by an independent diagnostic. Despite the significantly lower concentration of Ar, it contributes measurably to Zeff and can account for main plasma impurities as well. Other impurities either have never been seen or appear only sporadically (like Fe and Cu) and normally do not contribute significantly to the plasma radiation in the soft x-ray range." @default.
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- W2028786908 date "2001-11-01" @default.
- W2028786908 modified "2023-09-25" @default.
- W2028786908 title "Measurement of spurious impurity concentrations in ASDEX Upgrade by x-ray spectroscopy" @default.
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- W2028786908 doi "https://doi.org/10.1063/1.1405792" @default.
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