Diamond double-crystal monochromator in Bragg geometry installed on BL-11XU at SPring-8

We present here the feature of the diamond double-crystal monochromator in Bragg geometry installed on a standard undulator beamline at SPring-8. The crystal was manufactured by Sumitomo Electric Industries, Ltd., whose size was 8.6 mm (w) x 3.5 mm. (l) x 0.35 mm. (t) for the first crystal and 10 mm . (w) x 4.7 mm (l) x 0.39 mm (t) for the second. The feature of the monochr omator was tested by rocking curve measurements as a function of the total power and of the energy that impinged on the crystal. As a result, no signi ficant increase of the full-width at half-maximum was observed up to a tota l power of 330 W on the first crystal. We discuss the experimental results with the comparison to the calculated FWHM with use of the beamline paramet ers. (C) 2001 Elsevier Science B.V. All rights reserved.