Present status of high flux beamline (BL40XU) at SPring-8

High flux beamline (BL40XU) was designed to use very high X-ray flux in various experiments. The X-ray source of BL40XU is a helical undulator and the fundamental radiation can be altered from 8 to 17 keV by changing its gap. Two water-cooled mirrors are located in the optics hutch. After focusing horizontally and vertically by these two mirrors, the X-ray is introduced into the experimental hutch. At the sample position, the focused beam size is 250 μm (horizontal)×40 μm (vertical) (FWHM) and the flux is estimated to be 1×10 ¹⁵ photon/s. As a detector, a fast CCD camera combined with an X-ray image intensifier with a short-decay phosphor is installed. The framing rate of the fast CCD camera is 290 frame/s (with frame size of 640×480 pixels, 10 bits) and up to 5000 frame/s is achieved by reducing the size of the frame. BL40XU was open for public use from April 2000, and various experiments that require high X-ray flux have been carried out.