title: A wide-aperture dynamically focusing sagittal monochromator for X-ray spectroscopy and diffraction.
abstract: A scanning dynamically focusing sagittal X-ray monochromator accepting 7 mrad of the fan from a 6 T wiggler is in routine use on beamline 16.5 (ultra-dilute spectroscopy) of the SRS at CCLRC Daresbury Laboratory, UK. The energy range covered is 7-27 keV, with a horizontal spot size of <1.1 mm FWHM. Measured monochromatic flux from a Si 220 crystal pair is 1 x 10(11) photons s(-1) (100 mA)(-1) at 9 keV. This level of flux, usually associated with an insertion device on a third-generation source, permits collection of EXAFS data on concentrations at or below 10 ppm.
authors.affiliation: CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK. r.l.bilsborrow@dl.ac.uk
authors.forename: R L
authors.initials: RL
authors.lastname: Bilsborrow
authors.forename: P A
authors.initials: PA
authors.lastname: Atkinson
authors.forename: N
authors.initials: N
authors.lastname: Bliss
authors.forename: A J
authors.initials: AJ
authors.lastname: Dent
authors.forename: B R
authors.initials: BR
authors.lastname: Dobson
authors.forename: P C
authors.initials: PC
authors.lastname: Stephenson
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008832:Microchemistry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012371:Robotics / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity; D013052:Spectrometry, X-Ray Emission / Q000295:instrumentation* / Q000379:methods; D017356:Synchrotrons / Q000295:instrumentation*; D014961:X-Ray Diffraction / Q000295:instrumentation* / Q000379:methods