Blade-type X-ray beam position monitors for SPring-8 undulator beamlines

The X-ray beam position monitors had been designed and installed for SPring -8 insertion device beamlines. These monitors are being utilized for photon beam diagnostics. The beam from the standard undulator in SPring-8 has the total power of 11 kW and the power density of 470 kW/mrad(2), typically. E ach monitor has four CVD diamond blades coated with metal for detector head s. We have already introduced three styles of monitors to match various ins ertion devices in SPring-8. A standard style, or a fixed-blade style, is us ed mainly for a standard in-vacuum undulator beamlines. A horizontal-blade- drive style and a four-blade-drive style are used for beamlines of a wiggle r and a twin helical undulator that have wide power distributions, and for figure-8 undulators that have asymmetric power distributions, respectively. This report describes the design and the structure of these monitors and t he beam-tests for the photon beam diagnostics in detail. (C) 2001 Published by Elsevier Science B.V.