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CHESS West
C1 Station
The old C line stations, C1 and C2, have a long and successful history as the primary
EXAFS hutches for CHESS. In particular, the C2 "workhorse" monochromator has
been optimized for energy step scanning in ranges between 6 and 35 keV. We are currently
in the process of completely rebuilding the C line, creating a single large station with
many new capabilities. The C2 monochromator will be relocated to B2 (a space slightly
larger then C2) where it will continue to provide x-rays for EXAFS and near-edge
spectroscopies. Both the B2 and C hutches will have improved gas handling and toxic
venting.
The scientific capabilities of C-line will shift and beams for a much broader range of
experiments will become available. The new C-line hutch will be a spacious facility with a
mission that includes both monochromatic high-resolution 4-circle diffraction and
continuous energy range, focused beam data collection using the latest methods in
diffraction and absorption spectroscopy. The x-ray optics, which are housed in a new
vacuum coffin, will include both a highly flexible double bounce monochromator with
sagittal focusing and a large side diffraction focusing monochromator (see photo below).
Either system can be used with a mirror for vertical focusing and/or harmonic rejection.
The station is white-beam capable, equipped with both a large 4-circle diffractometer, and
a "floatable" precision optical table used for mounting experiments that
intercept the side bounce focused beam.
The side bounce horizontal crystal bender. The triangular crystal is supported by a
water-cooled copper block.
|
C1
station summary |
|
Source: |
e-s,
Hard bend magnet HB5West, 6 mrad (horizontal) into C1 |
Source size:
|
FWHM (horizontal) = 1.86 mm, FWHM (vertical) = 1.39 mm |
|
Distance to
source: |
14.5 m to center of hutch |
|
Be windows: |
0.030 inch into hutch |
|
Cave slit sizes: |
0 to 60 mm (horizontal), 0.25 to 3.0mm (vertical) |
|
White Beam: |
1 horizontal mrad |
| |
|
Monochromators: |
Double-bounce (with high resolution 4-bounce capability or side
bounce) |
|
Crystals |
Sag. Focus. |
Energy
(keV) |
 |
 |
/2 |
/3 |
|
Si
(111) |
Yes |
5-40 |
1.3 |
0.008 |
0.093 |
|
Si
(111) |
Yes (4 bounce) |
12-24 |
0.13 |
0.008 |
0.093 |
|
Si(400) |
Yes |
8-50 |
0.25 |
0.036 |
0.009 |
| |
|
Monochromatic Mirrors: |
|
Type |
Length |
Vertical Focus |
|
E* c(keV-mrad) |
|
Rh
coated Si |
24 inches |
Yes |
|
67.0 |
|
Au coated Si |
9 inches |
No |
|
80 |
|
Quartz |
9 inches |
No |
|
33 |
|
Float Glass |
9 inches |
No |
|
30 |
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Typical Experiments: |
|
Type |
Energy Range |
Equipment Setup |
|
Typography |
|
Optical Table |
|
High Res. Anom. Scattering |
5-50 keV |
6-circle Diffractometer |
|
Inelastic Scattering |
|
Inelastic Spectrometer |
|
Magnetic Circular Dichroism |
|
X-ray Polarimeter |
|
Monochromatic Crystallography |
|
Optical Table |
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Last Update:
2006-09-21
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