Beamline I11 at Diamond is the latest facility that has recently become operational for high resolution powder diffraction experiments. We present the design, key specifications and the hardware of this new beamline which receives an intense and highly collimated x-ray beam generated by an in-vacuum undulator. With the simple optics (a double-crystal monochroma-tor, harmonic rejection mirrors and slits), a high purity beam of low energy-bandpass x-rays in the range 5-30 keV is delivered at the sample. The heavy duty diffraction instrument is designed to have the flexibility to house a variety of sample environments and to have two detection systems to collect high quality diffraction data, i.e. multi-analysing crystals (MAC) for high angular resolution experiments and a fast position sensitive detector for time-resolved studies.

We have obtained results using the high resolution mode in the commissioning phase, in-cluding beam performance characteristics, powder diffraction peaks and profiles and resolu-tion function data from high quality SRM standards (Si_640c and LaB₆_660a). In addition, the first results obtained from mineralogical samples are given to demonstrate the capability of this new instrument.

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1. New powder diffraction beamline (BL-I11) at Diamond