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The beamline

The CDI beam path, area by area. CORA models the beamline as one root Asset (CDI) with the devices nested below it; this page is the human walk, the Inventory is the flat reference.

CDI runs from the in-vacuum undulator through a first-optics hutch into an endstation where a KB mirror pair focuses the coherent beam onto the sample and the far-field diffraction pattern is recorded. Two enclosures carry it:

  9-ID-A  (optics hutch / FOE)              9-ID-C  (endstation)
  ----------------------------------        --------------------------------------
  IVU18 -> HDCM / DMM -> VPM / HPM          KB nanofocus -> BCU -> sample (Gon)
           white-beam / branch slits        towers          Eiger2 / Merlin
  • Source (9-ID-A): the IVU18 undulator and the storage-ring readback, then the optics, the silicon double-crystal monochromator and the double-multilayer monochromator, the vertical and horizontal pre-mirrors, the white-beam and branch slits, the attenuator foils, the master energy, and the upstream beam diagnostics. This page is generated from the descriptor.
  • Sample (9-ID-C): the KB nanofocusing mirror pair that forms the coherent spot, the beam-conditioning unit that trims it just before the sample, the sample goniometer, the endstation positioning towers, and the endstation diagnostic cameras.
  • Detector (9-ID-C): the Eiger2 and Merlin photon-counting area detectors that record the far-field coherent-diffraction pattern.
  • Controls: the motion controllers and the timing seam, where the CDI profile collection's missing trigger box is the headline question.

Each device binds a catalog Family and a verified EPICS PV; none binds a vendor Model (part numbers are not in the public config). The one detail to flag is that the 09IDB branch zone (the BranchSlit and the quadrant BeamPositionMonitor) may be a distinct enclosure (ENC-1); it is folded into the optics hutch here. The loose families are the BeamPositionMonitor, shared with other deployments and held for gate-review, and the StorageRing machine-state supply.