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Click on the station names for more information
A-line was again rebuilt in 2001, both on the accelerator side of the shielding
wall and in the experimental hall. The
A1 station receives
half of the radiation from a 49 pole 0.8 T wiggler and is fixed in energy at
~13.1 keV with both
vertical and horizontal focusing.
A2 receives the other half of the wiggler beam via A3
which operates primarily as the optics room for A2. In certain instances A3 may be used as
an end station for an undulator run and will also (at the expense of A2 operation) allow
direct access to the 20 kW white beam (at 500 mA operation) 28 meters from the wiggler
source.
B and C lines use radiation from the CESR high-field dipole bend magnets.
B1 is
dedicated to diamond anvil-cell high pressure experiments using the National High Pressure
Facility. The
B1 hutch was expanded in 1995 and in the
past year the optics have been modified to provide better access and safety control of the
high power lasers in use at the station.
B2
can deliver either white beam or monochromatic bend magnet radiation.
The peak spectral intensity occurs at about 11 KeV, and monochromatic beam
has been used up to 35 KeV. Over the last few years, B2 has been used
for: angle-dispersive high pressure powder diffraction (ADXD), EXAFS,
fluorescence spectroscopy (including micro-science utilizing focusing
capillary optics), single crystal diffraction, and instrumentation
development. The monochromator has a simple, versatile design that
permits relatively quick change between white beam and several choices of
silicon and germanium crystals. For ADXD most users prefer germanium
(111) because it delivers the most flux at the standard energy, 25 KeV.
Over the last year (2004) ADXD experiments have gained in efficiency because
of the MAR 345 detector.
The old C1 and C2 stations were replaced by a new single larger
C1 x-ray hutch with a choice of x-ray optics. One
configuration is a side bounce monochromator to focus a wide energy range x-ray beam onto
a small spot. Alternately a double crystal monochromator feeds a 6-circle
diffractometer for precise scattering studies.
Last Update:
2006-09-21
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