A1Facility Description
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
200µm collimator |
| Focus Size: |
FWHM ~0.20 mm (vertical), ~1.00 mm (horizontal) |
| Energy Resolution: |
12.68keV (0.987 A) |
| Polarization: |
>88% linear |
| Monochromators: |
Horizontal focusing 5.05°
asymmetric cut Si(111) |
| Monochromatic Mirrors |
| Type |
Length |
Vertical Focus |
E*θ°(keV-mrad) |
| Rh coated Si |
24 inch |
Yes |
67.0 |
| Typical Experiments |
| Type |
Energy Range |
Equipment Setup |
| Crystallography |
12.68 keV (0.978 A) |
MacCHESS oscillation equipment |
| High res. scattering |
12.68 keV |
Standard optical table & equipment |
● Special A1 and F1
x-ray optics
●
Technical highlight on Macromolecular
Crystallography at CHESS
