CHESS West
A1 Station

The A1 Station receives doubly-focused monochromatic x-ray beam from a new 49-pole west wiggler. Recently CHESS installed a white-beam collimating mirror in front of the monochromator to assist in reducing the heat-load on the monochromator crystal and to aid in focusing.  The small size of the beam at the focal position makes this station ideally suited for crystallography, small-angle scattering and fiber diffraction from extremely small specimens. The capabilities of this station are similar to those of the highly successful CHESS F1 station.

A1 station summary Source: e-s, 49 pole wiggler, 0.6 mrad into A1 Source size: FWHM (horizontal) = 3.61 mm, FWHM (vertical) = 1.07 mm Distance to source: ~28 m to center of A1 hutch Be windows: 0.040 inch Be and 0.02 inch Graphite before A1 hutch Cave slit sizes: Remotely adjustable in mono box Flux (250mA)(p/s): 5.0x1013 total flux, 7.5x1011 thru 200m collimator Focus Size: FWHM ~0.20 mm (vertical), ~1.00 mm (horizontal) Energy Resolution: ~20ev (at mono energy of 13.1 keV) Polarization: >88% linear   Monochromators: Horizontal focusing, 5.05° asymmetric cut Si(111)   Monochromatic Mirrors: Type Length Vertical Focus   E*c(keV-mrad) Rh coated Si 24 Inch Yes   67.0   Typical Experiments: Type Energy Range Equipment Setup Crystallography High res. scattering 13.1 keV 13.1 keV MacCHESS oscillation equipment Standard optical table & equipment

• Special A1 X-ray Optics
• Technical highlight on Macromolecular Crystallography at CHESS

Last Update: 2006-09-14