XFM¶
X-ray Fluorescence Microprobe at NSLS-II, beamline 4-BM: a scanning-XRF microprobe that rasters a sample through a focused bending-magnet beam and reads element maps on a multi-element silicon-drift detector, with a Maia continuous-mapping array. This page describes how CORA would model and run XFM; the model is reverse-engineered from public configuration, not yet confirmed by XFM staff.
| Property | Value |
|---|---|
| Asset | XFM (root Asset, tier = Unit, parent_id = None) |
| Facility | NSLS-II (bound via facility_code = "nsls2", FacilityKind = Site) |
| Sector | Sector 4 (PV namespace XF:04BM*; the endstation zone is XF:04BMC) |
| Institution | Brookhaven National Laboratory (context; not modeled as an Asset or Facility) |
| Status | Reverse-engineered from public config (design-phase scaffold) |
| Source | 4-BM bending magnet (not an insertion device) |
How CORA would land on XFM
These pages describe how CORA would model, govern, and conduct XFM, the fifteenth NSLS-II beamline after FXI, HXN, BMM, SRX, SIX, CHX, CSX, XPD, ESM, SMI, IXS, SST, ISS, and FMX. They are not a survey of the beamline's current software. The hardware facts are read from public NSLS-II open source (the NSLS2/xfm-profile-collection bluesky / ophyd startup files), which is endstation-only: the raster stage and detectors carry real PVs, but the bending-magnet source, the monochromator, the focusing optic, and the shutters are not in the profile and are carried confirm with no PV (Open questions). This is a design-phase scaffold: the descriptor and these docs, with scenarios deferred.
The defining shape: scanning XRF, pure reuse¶
XFM is a scanning X-ray fluorescence microprobe: it rasters a sample through a focused spot and reads the fluorescence spectrum at each point to build element maps, with a Maia array for fast continuous (fly-scan) mapping. It is CORA's second scanning-XRF beamline, after 2-ID, and a pure-reuse deployment: it coins no Family and graduates nothing. The multi-element silicon-drift detectors reuse EnergyDispersiveSpectrometer, the raster stage LinearStage, the scaler I0 channels FluxMonitor, and the bending-magnet source the loose Beam PhotonBeam supply (the 2-BM / BMM precedent). XFM is the second consumer of the pending scanning_fluorescence_microscopy Method (2-ID was first), which strengthens but does not coin it (the energy_scan deferral discipline). It is a genuinely thin model: the public profile exposes only the endstation, so the optics are carried confirm-only.
The beamline¶
Along the beam, in order:
- Source: the bending-magnet source and the front-end / photon shutters, then the optics, the monochromator, the focusing optic, and the beam-defining slits (the optics carried confirm-only).
- Sample: the UTS raster scanning stage.
- Detector: the Xspress3 silicon-drift fluorescence detector, the Maia continuous-mapping array, and the scaler flux channels.
Cutting across all three:
- Controls: the scaler-counted raster, the Maia fly-scan, and the seam with the floor.
The cross-cutting reference view is the Inventory.
Techniques¶
Techniques: the scanning XRF mapping XFM runs (and the XANES leg it could), and why the Method stays pending.
Governance¶
Governance: who may act at XFM and the trust shape CORA applies; CORA brings its own per-Actor authority.
Model¶
Model: the developer's by-kind index into where each CORA aggregate's XFM content lives, and why XFM graduates nothing.