High flux beamline (BL40XU) was designed to use very high X-ray flux in var
ious 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 h
orizontally and vertically by these two mirrors, the X-ray is introduced in
to the experimental hutch. At the sample position, the focused beam size is
250 tm (horizontal) x 40 mum (vertical) (FWHM) and the flux is estimated t
o be 1 x 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 fram
ing rate of the fast CCD camera is 290 frame/s (with frame size of 640 x 48
0 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 e
xperiments that require high X-ray flux have been carried out. (C) 2001 Els
evier Science B.V. All rights reserved.