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The OXS is situated in front of Mirror Module B. The OXS concept separates the processes of energy dispersion and imaging. The large mosaic panel of flat crystals in front of the telescope acts as a narrow bandpass filter and as a mirror. Each pixel in the reflected field of fiew of the telescope satisfies a specific Bragg angle on the crystal and, therefore, each pixel in the detector can be identified with a particular energy. Scans which involve repositioning of the telescope axis and the angle between the crystal panel and the telescope axis (45 +/- 15 deg.) yield either the spectrum of a point source or energy resolved images of an extended source. Multilayer (ML) structures will be deposited on the polished surfaces of the LiF and Si crystals to allow simultaneous measurements of the Fe L and other prominent lines in the energy range below the C K-edge.
During observations with the OXS, the source is located approximately 90 deg. from the pointing direction of the other instruments. Furthermore, to ensure a proper theta-2 theta scan, the satellite will be moving during the observation. Current expectations are that each OXS observation will consist of approximately 10 successive pointings separated by <10 arcmin, each of about 10 ksec duration.
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