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Simplified plan view of the Fermi chopper spectrometer. The letters G, F, C, S, and D dcnote the guide, filter, chopper, sample and detectors respectively; M1 and M2 are the monochromator crystals and RC is the (oscillating) radial collimator. Incident wavelengths between 0.23 and 0.61 nm are obtained by modifying the Bragg diffraction angle of the double monochromator, as suggested by the dashed lines in the figure. The guide is continued to additional instruments downstream.
