Developments in optics and performance at BL13-XALOC, the macromolecular crystallography beamline at the ALBA synchrotron.

ABSTRACT: BL13-XALOC is currently the only macromolecular crystallography beamline at the 3 GeV ALBA synchrotron near Barcelona, Spain. The optics design is based on an in-vacuum undulator, a Si(111) channel-cut crystal monochromator and a pair of KB mirrors. It allows three main operation modes: a focused configuration, where both mirrors can focus the beam at the sample position to 52 µm × 5.5 µm FWHM (H × V); a defocused configuration that can match the size of the beam to the dimensions of the crystals or to focus the beam at the detector; and an unfocused configuration, where one or both mirrors are removed from the photon beam path. To achieve a uniform defocused beam, the slope errors of the mirrors were reduced down to 55 nrad RMS by employing a novel method that has been developed at the AL

SUBMITTER: Juanhuix J 

PROVIDER: S-EPMC4073956 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature