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The beamline

The part of 2-ID CORA models today, as areas you can jump to: the source spine and the 2-ID-D microprobe endstation, plus the controls that drive them. Design-phase.

2-ID is the Sector 2 hard X-ray microprobe beamline: one insertion-device source feeding more than one experiment hutch. This scaffold models the 2-ID-D hutch, the scanning fluorescence microprobe, and the source optics it draws on. The sister station(s) and the upstream optics-hutch detail are deferred and flagged TOPO-1 (see Model), the same way the 32-ID scaffold modelled only 32-ID-C.

The modelled beamline divides into two kinds of thing. Along the beam, in order, sit the stations: the Source that delivers, conditions, and focuses the beam, the Sample stage that rasters the specimen through the focused spot, and the Detector that records the fluorescence at each point. Cutting across them are the Controls that drive the hardware. The stations are containment trees of apparatus (Asset.parent_id); controls relate to that apparatus sideways, by controller_id.

Stations

  • Source: the Sector 2 undulator and the monochromator that selects the scanning energy (both upstream and shared across the sector), then the Fresnel zone plate in 2-ID-D that focuses the beam to the scanning spot. The zone plate carries the zp_z focus axis EAA's autofocus loop drives. Whether the source optics serve more than one hutch is the open TOPO-1 question.
  • Sample: the sample-scanning stack in 2-ID-D, the raster axes the sample moves through the focused spot on (a 2D fly raster or a 1D step scan).
  • Detector: the energy-dispersive fluorescence detector that records an X-ray spectrum at each scan point, from which element maps are fit downstream.

Shared

  • Controls: the APS EPICS control stack and the Bluesky scan path, and the autofocus and drift-correction loop CORA's Conductor takes over from EAA. Device handles are not yet on file (CTRL-1).
  • Resources: the continuously-available supplies a run needs (photon beam, cooling water); carried in the descriptor, with no operations page yet in this design phase.

Reference

The cross-cutting view that spans every area:

  • Inventory: the full planned CORA Asset model for the modelled part (every device by parent_id, with Families and pending confirmations). The hutch PSS permit signal is an APS facility signal, not yet named (see Open questions).