Abstract
The undulator X-ray source is an ideal source for many applications: the beam is brilliant, highly collimated in all directions, quasi-monochromatic, pulsed and linearly polarized. Such a precious source can feed several independently operated instruments by utilizing a downstream series of X-ray transparent monochromator crystals. Diamond in particular is an attractive monochromator as it is rather X-ray transparent and can be fabricated to a high degree of crystal perfection. Moreover, it has a very high heat conductivity and a rather small thermal expansion so the beam X-ray heat load problem is easily overcome. We describe a possible setup with three successive monochromators. We present data and analysis for focusing the beam in both the horizontal and vertical direction and discuss the focusing properties in both the Laue and Bragg geometry.
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