Techniques

What CORA would run at CHX: coherent-scattering techniques, each a Catalog Method. CHX is the second coherent beamline CORA models, after APS 8-ID, and it follows 8-ID's deferral exactly.

CHX's techniques are coherent-scattering, new to CORA's imaging- and spectroscopy-heritage catalog. As at 8-ID, the Methods below render unlinked and are carried pending until the owner-scope decision (TECH-1) brings them into the catalog.

Technique	Catalog method	Notes
XPCS	xpcs	coherent-speckle intensity time series on the Eiger, gated by the Zebra / fast shutter (TIMING-1); Method not yet in catalog
Small-angle scattering	small_angle_scattering	static SAXS/WAXS on the same detectors; a Plan setting over the same chain
Grazing-incidence scattering	small_angle_scattering	GISAXS: the same scattering Method with the beam steered onto a surface by the GrazingIncidenceMirror (GI-1)
Alignment	alignment	beam, mirror, transfocator, and slit tuning; reuses the existing Method

All three scattering techniques need the sample stack and the coherent detectors; the fast shutter and Zebra (TIMING-1) gate the exposure.

Why the Methods stay deferred

8-ID opened the question of whether the XPCS and small-angle-scattering Methods enter CORA's catalog (TECH-1), and main deliberately left them pending: the concrete acquisition recipes (correlation time series, frame rates, exposures) join as the deployment approaches the point where CORA drives the beamline. CHX reinforces the case for both Methods at a second facility without coining either, the same earn-the-abstraction discipline the deferred scanning (HXN) and energy_scan (BMM) Capabilities follow. Because the defining Methods are not in the catalog, CHX records no Practice in the NSLS-II Site, exactly as 8-ID records none at APS; the binding lands when the Method does.

The correlation analysis itself (the g2 / multi-tau computation that turns the frame series into dynamics) is ComputePort work, not a beamline Method.