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Figure 4
The spatial resolution performance of the spectrometer. (a) Images of the detector plane from −40 µm to +40 µm FOV at selected positions, with the HFM set in the optical path. The incident photon energies are selected to be 284 eV ± 23.7 meV. (b) Images of the detector plane from −500 µm to +500 µm FOV at selected positions, with the Wolter mirrors set in the optical path. The labels in each panel of (a) and (b) indicate the deviation of the source center position from the theoretical center position. (c) Histograms of the detector plane, with the HFM set in the optical path. (d) Histograms of the detector plane, with the Wolter mirrors set in the optical path. (e) The resolution limit of the Wolter mirror (blue line) and the HFM (orange line) as a function of horizontal position. The dashed line represents the highest resolution achievable under the current limitations of the detector.

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RADIATION
ISSN: 1600-5775
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