Source

The incident beam, produced, conditioned, and defined before the sample. A walk along the source-stage devices; the sample and detection stages are documented as their own composed-fixture pages, the controllers that drive these devices are on the Controls page, and the supplies they draw on are in Operations. Each device pairs its human name with the EPICS handle, its key specs, and whether it is field replaceable. new marks a device not yet modeled in CORA; confirm marks a value taken from the docs that staff have not yet verified.

Generated from the descriptor

This page is generated from the descriptor at deployments/i20-1/beamline.yaml. Edit the descriptor, not this page. For the CORA Asset model, settings, vendor catalog, drawings, and wiring, see Inventory.

Property	Value
Facility	diamond
Sector	i20-1 (EDE)
Tier	Unit
Source	insertion-device (confirm: i20 is an undulator beamline, but the source / insertion device / front-end is not in the dodal commissioning module (p51.py); the PV root BL51P would carry it. Source identity and parameters are an open question (SRC-1))

Enclosures

Enclosure	Role	Facility	Permit signal
I20-1-OH	optics-hutch	diamond	confirm: PSS permit leaf not in the dodal module (PSS-1, ENC-1)
I20-1-EH	experiment-hutch	diamond	confirm: PSS permit leaf not in the dodal module; the experiment hutch carries the sample stage and the detectors (PSS-1, ENC-1)

Source

The insertion-device source. It is not in the dodal commissioning module (SRC-1); no source, front-end, or primary-mirror device is exposed.

Enclosure: I20-1-OH.

Name	Family	PV	Key specs	Replaceable	Status
Source	InsertionDevice		i20 undulator source. Not in the dodal commissioning module (p51.py); no PV, front-end, or storage-ring monitor is exposed. Identity and parameters pending (SRC-1).		confirm

Optics

The energy-dispersive optic chain. The bent-crystal polychromator that fans the energy band (the heart of EDE) is NOT in the dodal module (POLY-1); what is modelled is the turbo slit that selects an energy out of the dispersed fan. PVs verified against dodal src/dodal/beamlines/p51.py and devices/turbo_slit.py.

Enclosure: I20-1-OH.

Name	Family	PV	Key specs	Replaceable	Status
TurboSlit	Slit	BL51P-OP-PCHRO-01:TS:	Energy-selecting turbo slit (turbo_slit) at the polychromator: gap (energy resolution), arc (coarse gap-centre), and xfine (the main scanning axis selecting an energy out of the polychromatic fan). Reuses the Slit family. The dispersive polychromator it sits at is not in the source (POLY-1).		confirm
EnergyAxis	PseudoAxis		The energy selected from the dispersed fan by the turbo-slit xfine axis (BL51P-OP-PCHRO-01:TS:XFINE, also exposed standalone for the PMAC fly-scan). In full EDE the strip detector reads the whole band at once; the turbo slit picks a single energy for alignment / single-energy work. No separate PV (it is the turbo-slit axis).		confirm