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CHESS East
F1 Station
F1
Facility Description
F1 is a doubly focused x-ray station with capability to safely handle
biohazard materials at the BL2 level. Radiation from a 24-pole 1.2 Tesla wiggler magnet is
equally shared between the F1 and F2 stations. A white beam vertical focusing
mirror
has been installed upstream of the F1 and F2 monochromators to collimate the
beam and reduce the heat-loading on the monochromator optics by not reflecting
unwanted higher energies. The horizontally focusing monochromator is located 20 meters from the
source and a vertically focusing mirror is located 0.68
m downstream of this to further focus the beam for F1. The focused beam has a 1
mrad horizontal and a 0.4
mrad vertical divergence. The
working focal point is generally another 4 to 6 meters beyond the focusing crystal. It is
not possible to bring white beam into F1.
The station is particularly suitable for diffraction from small specimens because of the
very high intensity available in the focused beam. Although the station was designed with
a contiguous BL2 facility to enhance the capability for macromolecular diffraction, it
should also be a premier station for general x-ray scattering.
Equipment assigned to the station includes an optical table that can precisely align
a diffractometer, protein crystal camera, etc. The table is equipped with air
pads in order to reposition the table on the floor when a major energy change is
required. An oscillation camera for protein crystallography is also available
with a nitrogen cryo-system. The F1 beam is currently tuned to Br
absorption edge to facilitate single-wavelength anomalous diffraction (SAD)
phasing. Other pieces of equipment, such as a 6-circle diffractometer, can be
accommodated for special needs.
The F1 hutch is part of a larger BL2 biohazards handling facility. The other
parts include a control room area, a room with a laminar flow hood for sample mounting equipped with HEPA filters, a
conventional crystal mounting room and a room where computer facilities are
available.
F1 hutch
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F1 station summary |
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Source: |
e+s,
24 pole wiggler, 1.0 mrad into F1 |
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Source size: |
FWHM (horizontal) = 3.76 mm, FWHM (vertical) = 0.944 mm |
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Distance to
source: |
25 m to center of hutch |
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Be windows: |
0.050 inch Be and 0.03 inch Graphite before F1 hutch |
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Flux (200mA)(p/s): |
3.0x1011
thru 300 m collimator |
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Focus Size: |
0.2 mm (vertical), 2.00 mm (horizontal) |
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Monochromators: |
Horizontal bent Si(111), asymmetrically cut with water cooled Cu
Block |
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Monochromatic Mirrors: |
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Type |
Length |
Vertical Focus |
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E* c(keV-mrad) |
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Rh
coated Si |
24 Inch |
Yes |
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67.0 |
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Typical Experiments: |
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Type |
Energy Range |
Equipment Setup |
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Crystallography
High res.
scattering
Small-angle scattering |
13.5 keV
13.5 keV |
Standard MacCHESS equipment
Standard optical
table & equipment |
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Unique Features:
Biohazard level 2 facility with Laminar Flow Cabinet |
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Last Update:
2006-09-21
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