CSX

The Coherent Soft X-ray scattering beamline at NSLS-II, and CORA's second soft X-ray deployment. This page walks the operational core CORA models today. It is a reverse-engineered first cut, not yet a running model.

Property	Value
Asset	CSX (root Asset, tier = Unit, parent_id = None)
Facility	NSLS-II (bound via facility_code = "nsls2", FacilityKind = Site)
Sector	Sector 23 (the 23-ID-1 branch; PV namespace XF:23ID*; not a registered Asset)
Status	First cut, reverse-engineered, design-phase (descriptor + docs; scenarios deferred)
Source	Two elliptically-polarizing undulators on the canted SR:C23-ID straight
Control stack	NSLS-II EPICS / ophyd (the same floor as the other NSLS-II beamlines); handles bound from the profile collection, carried confirm

First cut, and confirm-pending by intent

This scaffold was reverse-engineered from the beamline's own bluesky profile collection (NSLS2/csx-profile-collection). EPICS PVs are real and verified against the startup/csx1 files; vendor part numbers, serials, and physical positions are not in the profile collection and are open questions. Every value is carried as confirm until CSX staff verify it. What CORA needs the team to confirm is on Open questions.

What CSX consolidates

CSX is the consolidation of the soft X-ray regime that SIX opened. It earns abstractions rather than minting them:

• It graduates GratingMonochromator. CSX's VLS-PGM (200-2200 eV) is the second soft X-ray plane-grating monochromator after SIX's, which earns the rule-of-three: GratingMonochromator becomes a catalog Family in this deployment (see Model). The grating line density and energy range are a per-Asset settings difference, not a Family split.
• It reuses the Diffractometer Assembly. Its TARDIS endstation is an in-vacuum hkl E6C diffractometer; its circles bind the catalog Goniometer Family and the composed Assembly(Diffractometer), a third hkl diffractometer after 4-ID and 8-ID (now in a soft X-ray, in-vacuum context).
• It adds no new family of its own. Every device reuses an existing catalog Family.

It runs on the inboard 23-ID-1 branch of the canted 23-ID straight (two EPUs feed the sector).

Scope: what is and is not modelled

Part	In this cut	Why
Optics (XF:23IDA, XF:23ID1-OP)	Yes	Two EPUs, the front-end mirror, the VLS-PGM, the refocusing mirror, the slits
TARDIS endstation (XF:23ID1-ES)	Yes	The E6C diffractometer, the sample stage, the cryostat, the coherent detectors
GratingMonochromator	Graduated	The 2nd soft PGM earns it into the catalog (see Model)
Nanopositioner / holography detail	Coarsely	The sample holography stage is carried; the fine piezo nanopositioner is deferred
Integration scenarios + vendor Models	No	Design-phase; the descriptor and docs come first

The deferred parts are recorded on Model.

The beamline

• Source: the generated device walk: the two canted EPUs, the front-end mirror, the VLS-PGM, the refocusing mirror, and the branch slits.
• Sample: the TARDIS E6C diffractometer, the reciprocal-space coordination, the sample stage, and the cryostat temperature controller.
• Detector: the FastCCD and AXIS coherent area detectors, the fast shutter and diode, and the counting electronics.

Cutting across them:

• Controls: the EPICS / ophyd control stack and the bluesky-orchestration seam; handles bound from the profile collection and carried confirm.

The cross-cutting reference view is the Inventory. The Source page is generated from the beamline.yaml descriptor.

Techniques

Techniques: what the modelled part of CSX is designed to do, as intent. Its resonant and coherent soft X-ray scattering legs reuse existing catalog Methods, carried pending.

Governance

Governance: who will act at CSX and the trust shape that gates their commands. People and agents are facility principals at the NSLS-II Site.

Model

Model: the developer's by-kind index, the GratingMonochromator graduation this deployment earns, and the record of what is deliberately deferred.

Not yet documented

CSX is not yet driven by CORA, so the operations runbook and the live experiment view are deliberately not written yet. They join as the deployment firms up. The 2-BM deployment shows the shape they will take.