ID14 QUADRIGA, A BEAMLINE FOR PROTEIN CRYSTALLOGRAPHY AT THE ESRF

The ESRF undulator beamline ID14 'Quadriga' is dedicated to monochroma tic macromolecular crystallography. Using two undulators with 23 mm an d 42 mm periods and a minimum gap of 16 mm installed on a high-beta se ction, it will provide high-brilliance X-ray beams at around 13.5 keV as well as a wide tuneability between 6.8 and 40 keV. Based on the Tro ika concept, this beamline has four simultaneously operating experimen tal stations: three side stations: EH1, EH2 and EH3, using thin diamon d crystals, and an end station, EH4, with a fast-scan double-crystal m onochromator. Station EH3 has a K-diffractometer, and an off-line Weis senberg camera with a large 80 x 80 cm active area combined with a 204 8 x 2048 CCD detector. During data collection the image plates are pla ced and removed by a robot located inside the hutch using a cassette s ystem. After data collection the image plates are scanned with an off- line drum scanner. Station EH4 is designed for MAD applications, inclu ding Xe K-edge anomalous experiments, and is equipped with a 2048 x 20 48 CCD detector on a pseudo 2 theta arm. A common graphical user inter face and a database will be available to cover all aspects of data col lection, including strategy optimization. First results on the perform ance of the optics elements and initial crystallographic results are p resented.