Dear Prof. Jones,
   At CHESS we don't have an experimental station setup specifically for
topography and rocking curve measurements, but I'm pretty sure it would
be straight-forward to do these measurements with existing equipment
once I understand a bit more about how you did the measurements at SRS.
    I am not discouraging you, but there may be a dediated topography
station available at another US source; maybe at Brookhaven or
Argonne.
    If you did the work at CHESS, to get the beam angular divergence down
to 1 arc second we'd use one or more beam expander (asymmetric)
crystals. The beam width (normal to the diffraction plane) could
easily being >6mm. In the diffraction plane the expander would blow
beam size up to >6mm.  We have the rotation/translation stages. What
did you use for a detector? We have lots of detectors but my guess is
you'd like spatial resolution like one has with film. So you'd need
file or an x-ray -> visible light converter and a camera to record the
images.
    As with all national light sources, you need to submit a proposal and
our run schedule needs to fit your needs (eg our next run is not until
Oct). I am at a workshop on Wed-Thurs. If you call me Friday, say 10AM
I will be at CHESS my office phone is xxx-xx-xxxx.
                      Ken