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Beamline Overview
The Advanced Photon Source (APS) is located at Argonne National Laboratory in the greater Chicago area. The APS is a 7 GeV third generation synchrotron source with a nominal circulating current of 100 mA. DND-CAT is located at sector 5 and operates 3 separate beamlines: two on a bending magnet source, 5BM-C and 5BM-D; and one on an Undulator A insertion device source. The insertion device line has three separate experimental enclosures: 5ID-B, 5ID-C, and 5ID-D.
The insertion device line has a Si-111 monochronometer and a pair of horizontal focusing mirrors. The uncollimated, unfocused beam is about 1 mm × 2.5 mm (V/H) with a flux of about 1x1013 ph/s. With focusing the beam size is reduced to 1 mm × 0.6 mm. There are five sets of collimating slits downstream of the mirrors, which are used to create a pinhole geometry SAXS camera with very little parasitic scattering. The last experimental enclosure on the insertion device line is 5ID-D. It is used primarily for studying polymer scattering in the small and wide angle regions and is in use for approximately 50% of the available beam time. See Figure 1 below for a cartoon of the beam layout.