MULTIPLE STATION BEAMLINE AT AN UNDULATOR X-RAY SOURCE

The undulator X-ray source is an ideal source for many applications: t he beam is brilliant, highly collimated in all directions, quasi-monoc hromatic, pulsed and linearly polarized. Such a precious source can fe ed several independently operated instruments by utilizing a downstrea m series of X-ray transparent monochromator crystals. Diamond in parti cular is an attractive monochromator as it is rather X-ray transparent and can be fabricated to a high degree of crystal perfection. Moreove r, it has a very high heat conductivity and a rather small thermal exp ansion so the beam X-ray heat load problem is easily overcome. We desc ribe a possible setup with three successive monochromators. Wk present data and analysis for focusing the beam in both the horizontal and ve rtical direction and discuss the focusing properties in both the Laue and Bragg geometry.