Analysis and modeling of anomalous scattering in the AXAF HETGS

John E. Davis; Herman L. Marshall; Daniel Dewey; Mark L. Schattenburg

doi:10.1117/12.331288

19 November 1998 Analysis and modeling of anomalous scattering in the AXAF HETGS

John E. Davis, Herman L. Marshall, Daniel Dewey, Mark L. Schattenburg

Proceedings Volume 3444, X-Ray Optics, Instruments, and Missions; (1998) https://doi.org/10.1117/12.331288
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Tests of the High-Energy Transmission Grating Spectrometer (HETGS) for the Advanced X-Ray Astrophysics Facility (AXAF) showed anomalous scattering of monochromatic radiation. The grating resolving power (E/dE) is of the order 1000, but test designed to search for small-angle scattering by the gratings showed events with significant deviations from the dispersed grating orders and concentrated along the dispersion direction. In this paper, we present a general overview of grating scatter as a result of fluctuations in the grating bar geometry. The grating scatter observed at the AXAF-X-Ray Calibration Facility is shown to be consistent with what one expects from scatter due to deviations in the grating bar geometry form perfect bars. For the purposes of modeling, a rectangular bar mode is adopted and bar parameters are deduced via fitting the model to the scattering data. The correlations deduce from this model lead to a simple physical picture of grating bar fluctuations where a small fraction of the bars, e.g., 1 in 200 are leaning.

Citation Download Citation

John E. Davis, Herman L. Marshall, Daniel Dewey, and Mark L. Schattenburg "Analysis and modeling of anomalous scattering in the AXAF HETGS", Proc. SPIE 3444, X-Ray Optics, Instruments, and Missions, (19 November 1998); https://doi.org/10.1117/12.331288

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