A1 Beamline

Wide-angle X-ray Diffraction and Scattering

Beamline Specifications


1.5m CHESS Compact Undulator


General X-ray Diffraction, Reciprocal Space Mapping
4-circle goniometer, photon counting detector on 2-theta arm
Wide-Angle X-ray Scattering (WAXS)
momentum transfer range 0.1 - 20 A-1
Ultra-small Angle X-ray Scattering (USAXS)*
momentum transfer range 0.0002 to 0.1 A-1
X-ray Fluorescence Mapping
spatial resolution 30x30 μm2

Sample Environment:

cryostream from 100K to RT (upon request)


side-bounce diamond Laue (111) and (220) monochromators, vertical bendable x-ray mirror (focusing,harmonic rejection), micro-focusing capillaries

Photon Energy:

19.9 keV (0.62 Å) (fixed)
32.5 keV (0.39 Å) (fixed)

Energy Bandwidth  ΔE/E:

1 x 10-3 **


ADSC Quantum-210 CCD, Eiger 1M, Pilatus 100K, Andor Neo

Beam size at sample:

Max. size 1.0 (V) x 4.0 (H) mm2
30x30 μm2 using a focusing capillary

Total flux:

2.0 x 1012 [photons/sec] at 19.9 keV
2.3 x 1011 [photons/sec] at 32.5 keV

Focusing (capillary) 30x30μm2

0.8 x 1011 [photons/sec] at 19.9 keV
1.0 x 1010 [photons/sec] at 32.5 keV

 *separate data collection for WAXS and USAXS, USAXS only available for 19.9 keV
** high resolution mode ( ΔE < 1 eV) is available upon request

In addition, A1 is fully equipped for monochromatic macromolecular crystallography; features include a single-axis goniostat, Oxford Cryosystems cryocooler, high-resolution crystal viewing system with autocentering as well as click-to-center software, ALS-style BAM-2 crystal automounter which accepts multiple types of puck, and an ADSC Quantum-210 CCD detector. Standard beam sizes are 100 µm (using a collimator) and 20 µm (using a focusing capillary); custom capillaries producing smaller beams are available. Conveniences include computer-controlled crystal annealing and special illumination to enhance a sample’s visibility, using its intrinsic fluorescence. The ADX data collection GUI provides experimental control. Special illumination which enhances sample visibility by using intrinsic protein fluorescence is installed. Mail-in and remote data collection modes are available, and a high level of support is provided for both on- and off-site users.

Quantum 210 detector
Crystallography equipment: rotation stage in the center; a mounted crystal would be just behind the yellow tape (which holds the beamstop); cryostream at top left, also the crystal-viewing camera, which is mostly hidden behind the cryostream; detector at right; automounter out of view to the left. Beam enters from the left (collimator was not in place when this photo was taken).


More:  http://www.macchess.cornell.edu/macchess/mbeamlines/A1_station