Model

The developer's index into where SIX content lives, the new loose families this first soft X-ray deployment introduces, and the record of what is deliberately deferred. First cut.

SIX is a descriptor-and-docs scaffold today, reverse-engineered from the beamline's profile collection: it exists as the descriptor and docs below, not yet as registered events or integration scenarios. This page points to where each piece lives, and records the scope decisions that are CORA's to make (kept off the staff Open questions, which carry only world-facts).

Kind	Where	Notes
Beamline descriptor	deployments/six/beamline.yaml	the device walk with bound PVs; source of the generated Source page
Site descriptor	deployments/nsls2/site.yaml	the NSLS-II facility surface; SIX added to its beamline list, with a RIXS Practice
Extraction provenance	NSLS2/six-profile-collection	the startup/*.py device classes the descriptor was curated from
Catalog Family	catalog/catalog.yaml	GratingMonochromator + Manipulator graduated (earned by CSX + ESM); SpectrometerArm stays loose at n=1 (below)
Catalog Method	catalog/catalog.yaml	none added; the RIXS Method is not yet coined (TECH-1)
Equipment Assets	not yet registered	the Inventory is the planned shape; no scenario registers SIX Assets yet
Trust / governance	not yet instantiated	see Governance

New loose families

SIX is CORA's first soft X-ray beamline, a new optics, detector, and sample-environment regime. It introduced three device classes no hard X-ray catalog Family covered. Two have since graduated: GratingMonochromator became a catalog Family once CSX (NSLS-II 23-ID) earned the soft X-ray PGM, and Manipulator once ESM (NSLS-II 21-ID) earned the UHV sample manipulator (the Monochromator and SampleManipulator here bind them). Only SpectrometerArm remains loose at n=1 (SIX only) and graduates nothing until a second RIXS beamline earns it.

Family	Presents (when graduated)	What it is	Status
GratingMonochromator	Positioner	the soft X-ray plane-grating monochromator (PGM): premirror at a fixed-focus c-value plus an interchangeable grating, no Bragg crystal	graduated (SIX + CSX, MONO-1)
SpectrometerArm	confirm (Sensor or Positioner)	the meters-long energy-dispersive RIXS arm (bridge truss + optics chamber + detector chamber)	loose at n=1; earns at a 2nd RIXS / dispersive-arm beamline (RIXS-1)
Manipulator	Positioner	the UHV cryostat sample manipulator (x/y/z/theta)	graduated (SIX + ESM, SAMPLE-1)

The catalog Monochromator is deliberately not stretched to cover the PGM: its note describes a crystal / multilayer Bragg monochromator, and a plane-grating mono has no Bragg crystal, selects energy by grating pitch and translation, and takes its resolution from the exit slit, so GratingMonochromator is a distinct Family rather than a settings variant. Likewise SpectrometerArm is distinct from the catalog EnergyDispersiveSpectrometer (a point Sensor, not a multi-chamber dispersive arm).

Deliberately not here yet

• The RIXS-camera Family question. The RIXS camera does on-detector single-photon centroiding and isolinear curvature correction, a photon-counting regime distinct from an integrating-frame area detector. It is modelled here as the catalog Camera with that behavior carried as a note; whether the photon-counting pipeline warrants its own Family is RIXS-2, deferred (a Camera-with-settings is the lower-risk first cut).

• The EPU polarization DOF. The elliptically-polarizing undulator adds a phase (polarization) axis beyond gap. It binds the catalog InsertionDevice with the polarization carried as a setting; whether the EPU phase warrants a distinct family is deferred until a second EPU beamline (SRC-1).

• The legacy end-station PGM. The profile collection carries a discarded second monochromator instance (Mono:2 / espgm) and a dead PGMjoe class; only the live Mono:1 PGM is modelled.

• The RIXS Method. Whether RIXS enters CORA's catalog is an owner decision; the Practice renders unlinked, pending (TECH-1).

• The simulated devices and full asset-tree scenarios. No test_six_*.py registers the SIX asset tree, and no vendor Models are bound. Those land when the design firms and the team approves.

• Operations and experiment views. A runbook and live experiment view for a beamline CORA does not yet drive would be invention; see the note on the index.

The 2-BM Model page shows the by-kind index a fully-modelled deployment carries.