Procurement of a High-precision single-crystal diffractometer for the SINCRYS micro-focus material-science beamline

Description du marché

The Department of Chemistry at Aarhus University puts out to tender the purchase of the end-station components to establish the SINCRYS side-station at MAX IV Laboratory in Lund, Sweden. The side-station will be constructed at the existing DanMAX beamline that is located at the fourth sector of the 3.0 GeV ring at the MAX IV Laboratory. SINCRYS will be tailored to high-throughput small unit-cell crystallography, commonly used in or-ganic molecular crystals, inorganic materials, and hybrid organic-inorganic compounds. The energy range will be between 20.30 – 23.00 keV. The instrument aims to maximise flux in a 5 × 5 μm2 (full-width half-maximum, FWHM) beam at the sample position with a defocusing option up to 100 × 100 μm2 using an all-diamond lens transfocator. This facilitates a state-of-the-art instrument to study crystals in the range of 2 - 10 μm (or larger). SINCRYS will be situated in an already existing hutch between a shared optics hutch and the DanMAX experimental hutch. The inner dimensions of the hutch are 5.4 m by 2.7 m, however, the existing beam guide for DanMAX limits the inboard side’s accessibility. The downstream half (ap-proximately) of the experimental hutch is supposed to remain vacant to provide room for future in-strument updates. The tentative end-station layout is presented in Figure 1. Shown are the five major components, diffractometer, beam conditioning unit, detector positioning robot, sample changer robot, and support table. A compact diffractometer with 3-axis (Omega, Kappa & Phi) is necessary to thoroughly sample re-ciprocal space for small unit-cell systems while still allowing a short sample-to-detector distance. The beam characteristics of SINCRYS require a highly precise goniometer with a sphere-of-confusion of less than 200 nm (scanning axis Omega with remaining axes mounted and positioned). All axes need to be encoded as typical data collections require different scan combinations of Ome-ga, Kappa and Phi that must be processed altogether. A fast maximum rotation speed of the scan ax-is (Omega) is advantageous to allow for high-throughput data collections. Regarding the high-throughput operation principle, automatic sample changing, loading, centring, and data collection are prerequisite. Various detector positions will be required to make room not only for standard structure determina-tions but also allow for more sophisticated experiments. The detector, an EIGER2 X 4M CdTe (~15 kg), shall be mounted on a 6-axis robotic arm. The robot must be able to position the detector pre-cisely and accurately while carrying all peripherals (e.g. cooling-water tubes, mounting device) and auxiliaries (e.g. sensitive skin panels) necessary to mount and adequately protect the system. The sample changing robot shall be compatible with standard magnetic sample holder bases and shall be loaded from standardised pucks. No cooling of the pucks (e.g. liquid Nitrogen baths) is re-quired. The two robots will be working in proximity and with overlapping working areas making safety and collision measures essential. The control of all individual components (e.g. detector robot, diffractometer axes) must integrate in-to the MAX IV Tango/Sardana system, allow for individual motor positioning (detector robot, diffractometer axes & tools, sample changer) and automatic data acquisition.

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