Techniques

What the modelled part of CSX is designed to do, as intent. First cut.

A technique is a portable Catalog Method; a Practice is how a facility adapts it. CSX's scattering legs reuse Methods already in the catalog's pending set, so they render unlinked and are carried pending until a technique enters scope (TECH-1).

Resonant soft X-ray scattering

CSX tunes the soft X-ray energy to an absorption edge and measures the scattered intensity through the TARDIS diffractometer, resolving electronic and magnetic order in reciprocal space.

Technique	Catalog method	Notes
Resonant soft X-ray scattering	resonant_scattering	RSXS on the TARDIS E6C; reuses the 4-ID resonant_scattering Method, in a soft X-ray regime (a Plan / settings difference)
Soft X-ray diffraction	diffraction	coherent soft X-ray diffraction through the TARDIS circles; reuses the 4-ID / 8-ID diffraction Method

Both need the grating monochromator (the incident energy), the TARDIS diffractometer, and the coherent detectors. The arm and sample circles select the momentum transfer.

Coherence and holography

CSX's defining quality is beam coherence: the FastCCD records coherent-scattering and holography patterns. This is carried as a beam-quality enabler and as settings on the scattering Methods above, not coined as its own Method; whether coherent soft X-ray scattering becomes a distinct catalog Method is an owner-scope decision (TECH-1).

Not modelled yet

The concrete acquisition recipes (energy maps, reciprocal-space scans, coherent / holography exposures) are not written yet; they join as the deployment approaches the point where CORA drives CSX. See Open questions for the world-facts to confirm first.