Open questions¶

What CORA needs the P21 team to confirm before the model can be trusted.

P21 was reverse-engineered from P21's own public OnlineXML device registry (gitlab.desy.de/petra-iii-debian-packages/python-nxstools-extras-p21, branch debian/jessie) and a verified research brief, not from a live connection. The P21 registry is thin: area-grouped generic motor banks, no detectors exposed. P21 is CORA's thirteenth PETRA III beamline, the Swedish Materials Science beamline. Each row below is a fact the beamline team owns, not a CORA modelling choice (those are on Model). It is a delete-on-answer queue. Priorities are Blocks-build, Blocks-go-live, and Nice-to-have.

Topology and scope¶

ID	Priority	Question	CORA assumes	Resolves
ENC-1	Blocks-go-live	The hutch grouping: a P21.2 optics hutch, an EH3 endstation, and a LAB station (plus the P21.1 branch)?	A `p21-oh` / `p21-eh3` / `p21-lab` grouping, from the OnlineXML host names.	The Enclosure grouping.
HOST-1	Blocks-go-live	The P21.1 station (`hasep211eh`) exposed only bookkeeping devices in this slice. Where is its device tree, and how do P21.1 / P21.2 relate?	Only P21.2 optics / EH3 / LAB modelled; P21.1 noted, not modelled.	The full beamline roster.
SRC-1	Nice-to-have	The undulator source (absent from this slice).	An undulator beamline; the source carried pending.	The source Asset.
GROUP-1	Nice-to-have	The per-axis roles of the motor banks (`oh_u`, `eh3_u`, `lab*`).	Grouped as stage Assets carrying the bank prefix; per-axis roles pending.	The Asset boundaries.

Source and optics¶

ID	Priority	Question	CORA assumes	Resolves
OPT-1	Blocks-go-live	The optics breakdown: the monochromator, mirrors, and slits within the P21.2 optics bank.	Grouped `LinearStage` optics stages; the breakdown pending.	The optics modelling.

The detectors¶

ID	Priority	Question	CORA assumes	Resolves
DET-1	Blocks-go-live	The high-energy diffraction detectors (area detectors, the PerkinElmer / Varex flat-panels typical of high-energy beamlines), absent from this registry slice.	A pending `Camera` placeholder; the detectors not invented.	The detector modelling.

Control and safety¶

ID	Priority	Question	CORA assumes	Resolves
CTRL-1	Blocks-go-live	The Tango device handles per P21 device, the three-host split, and whether the OnlineXML `debian/jessie` branch matches the live Tango database.	The handles read from the public OnlineXML, carried pending; the floor is Tango + Sardana.	Binding each Asset's control handle.
PSS-1	Blocks-go-live	The DESY personnel-safety permit signals and the photon / front-end shutters (absent from the OnlineXML).	Permit leaves and shutters to be named; not invented here.	The Enclosure permit signals and the safety tier.
SUP-1	Nice-to-have	The vacuum extent and the cooling / beam supplies.	Photon beam, cooling water, vacuum.	The Supply observations.
GOV-1	Nice-to-have	The DESY operator pool, the Swedish collaboration's role, and the safety-review structure (site-level).	Carried pending on the PETRA III Site, not instantiated per beamline.	The governance principals.

Technique¶

ID	Priority	Question	CORA assumes	Resolves
TECH-1	Nice-to-have	Do high-energy diffraction and total scattering enter CORA's catalog as Capabilities / Methods?	Deferred: carried as pending Practices reusing the `diffraction` / `total_scattering` slugs; none coined.	The technique Capabilities.