Skip to main content
News   |   Events   |   Safety   |   CHESS-U>   |   InSitμ   |   MacCHESS   |   CLASSE

X-RAY RUNS: Apply for Beamtime

2017  Nov 1 - Dec 21

2018  Feb 7 - Apr 3
2018  Proposal/BTR deadline: 12/1/17

2018  Apr 11 - Jun 4
2018  Proposal/BTR deadline: 2/1/18

 A1      A2      B1      C1      D1      F1      F2      F3      G1      G2      G3    

 

Wide-angle X-ray Diffraction and Scattering

A1 Beamline Specifications
Source: 1.5 m undulator, CCU design
Techniques: 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)
Optics: 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 **
Detector: 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)
30x30 μm2
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.

Figure 1

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/a1_beamline.html