The CRG BM25-SpLine Beamline is located at bending magnet 25 of the ESRF. The beamline, which is split in two branches, is devoted to XAS, XRD and HAXPES. The photon energy covered by both branches range between 5 and 45 keV. The beamline double crystal monochromator (DCM) uses two parallel Si(111) crystals in (+, -) configuration to produce a monochromatic exit beam parallel to the incident white X-ray beam. It accepts 2mrad of radiation from the bending magnet. The DCM has been recently upgraded. Several special features concerning the cooling of the first crystal, second crystal positioning and sagittal focusing mechanism has been improved. In this work a detailed description of the performed modifications is presented.

The authors are grateful to the SpLine staff for their valuable help and to the financial support from the Spanish MINECO and Consejo Superior de Investigaciones Cientificas under the Grant No MAT2011-23785, 2010 6 OE 013, ICTS-2007-02, MAT2005-25519-E, 2004 5 0E 292 and MAT2002-10806-E.

Paper presented at 11th International Conference on Synchrotron Radiation Instrumentation (SRI 2012), which took place in Lyon (France) during 9-13th July 2012.

Peer reviewed