کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1828724 1027437 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance of multi-crystal Bragg X-ray spectrometers under the influence of angular misalignments
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
پیش نمایش صفحه اول مقاله
Performance of multi-crystal Bragg X-ray spectrometers under the influence of angular misalignments
چکیده انگلیسی

X-ray beams have long been analyzed by series of Bragg reflections from crystals arranged in various configurations. The dependence of reflectivity and selected wavelength on the beam's incidence angle makes proper crystal alignment crucial, particularly as the number of crystals increases. A list of possible misalignments and a method for calculating their effects on the selected wavelengths, output beam positions, and throughputs are presented here. The following goes beyond the DuMond diagram to include rolls and rotation axis misalignments. These are described for a single crystal, and a ray-tracing method is derived for multiple crystals assuming that the misalignment angles are small. The angles are classified by their lowest-order term. Reflectivities for each ray are calculated by the equations of plane-wave dynamical diffraction theory. Then, as a practical application, sample calculations are discussed for the (+--+)(+--+) four-crystal monochromator being designed for beamline I20 at the Diamond Light Source.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 589, Issue 1, 21 April 2008, Pages 118–131
نویسندگان
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