MICROFOCUSING EXPERIMENTS ON A 2ND GENERATION SOURCE. T. Kikegawa and O. Shimomura Photon Factory, National Laboratory for High Energy Physics, 1-1 Oho Tsukuba, Ibaraki 305, Japan

At the Photon Factory new experimental stations, BL-18C and BL-13B2, have been constructed for high pressure studies using diamond-anvil cells (DAC). Two different focusing optics are exclusively designed for an angle dispersive X-ray powder diffraction experiment with an Imaging Plate as a two-dimensional detector. BL-18C, a bending-magnet beamline, is equipped with a computer-controlled fixed-exit double crystal monochromator and a pair of cylindrical mirrors. The monochromator consists of a pair of Si(111) flat crystals with (+n,-n) configuration. The Pt-coated fused quartz mirrors can focus an X-ray beam to about 0.08 mm x 0.03 mm in the Kirkpatric-Baez optics with a cutoff energy of about 25 keV.

A simple focusing optics is adopted for BL-13B2, the end station of the multipole wiggler beamline. The design is strongly restricted by the space problem; i.e. no extra space for further optical components on the existing beamline. Thus inside the experimental hutch only a curved crystal monochromator of the Johann geometry (Matsushita & Hashizume, 1983; Takeshita, 1995) is installed at 33m from the source point. An asymmetically cut Si(220) curved crystal monochromator is commissioned to obtain demagnified images of the syncrotron radiation source. The focus size is approximately 0.10mm in horizontal direction at the focus point 1.5m from the monochromator with the energy of 30keV.

The high pressure studies with DAC are carried out in both experimental stations. However, experiments at simultaneous high pressures and high temperatures are performed using a carbon dioxide laser heating device in BL-13B2.

References: Matsushita, T. and Hashizume, H. Handbook on Synchrotron Radiation, edited. by E.E.Koch (North-Holland, 1983), 1, 261 Takeshita, K (1995) Rev.Sci. Instrum. 66(2), 2234-2240.