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/19-bm/beamline.yaml. Edit the descriptor, not this page. For the CORA Asset model, settings, vendor catalog, drawings, and wiring, see Inventory.

Property	Value
Facility	aps
Sector	Sector 19
Tier	Unit
Source	bending-magnet (confirm: APS bending magnet (M3); 0.8 mrad horizontal acceptance, referenced to an alternate centerline 0.4 mrad inboard of the default new-BM centerline (FDR design phase))
Z span	0 to 55000 mm (confirm)

Enclosures

Enclosure	Role	Facility	Permit signal
19-BM-A	front-end-optics	aps	confirm: APS PSS permit signal TBD (PSS-1)
19-BM-C	transport	aps	confirm: shares the 19-BM-D search/secure volume via the held-open guillotine; permit arrangement TBD (ENC-1, PSS-1)
19-BM-D	endstation	aps	confirm: APS PSS permit signal TBD (PSS-1)

Source

The bending-magnet source. 19-BM accepts 0.8 mrad of the available horizontal BM fan, referenced to an alternate centerline 0.4 mrad inboard of the default new-BM centerline. The source is recorded as a Supply (PhotonBeam), not an Asset.

Enclosure: 19-BM-A.

Note

Filtered white-beam only: there is no monochromator and no mirror optics, so the spectrum is set entirely by the filter unit, not by optic moves. All 19-BM components that intercept synchrotron radiation are water-cooled and covered by the APSU bending-magnet thermal-analysis waiver (ICMS APSU_2286907).

Name	Family	PV	Key specs	Replaceable	Status
Source	Beam		kind: APS bending magnet (M3 magnet) max fan: 2.7 mrad horizontal (front-end first-mask limit 2.5 mrad) used acceptance: 0.8 mrad horizontal centerline offset: 0.4 mrad inboard of the default new-BM centerline bending-magnet source, recorded as a Supply(kind=PhotonBeam), not an Asset; renders as a loose family		new confirm

Front end

The front-end termination and beam-defining apertures in 19-BM-A: the single exit Be window bolted to the exit mask, the bremsstrahlung collimators, the white-beam slits, the filter unit, and the vacuum isolation gate valve.

Enclosure: 19-BM-A.

Note

The 19-BM design removes one of the two front-end Be windows at ~23 m (to minimise wavefront-distorting scatter) and in exchange terminates the beamline vacuum at ~50 m with the water-cooled Be window at the entrance of 19-BM-D. The only components that intercept the beam in 19-BM-A are the exit mask, the slits, and the filters.

Name	Family	PV	Key specs	Replaceable	Status
FEExitWindow	Window		z mm: 23000 material: beryllium (FE-standard thickness) cooling: integrated with the front end single front-end exit Be window; bolted rigidly to the exit mask A359-M20 so the two share one survey fiducial		new confirm
ExitMask	Mask		passive z mm: 23000 sketch: A359-M20 acceptance: 0.8 mrad horizontal (of 2.5 mrad available from the FE) centerline offset: 0.4 mrad inboard of the default new-BM centerline cooling: water-cooled (APSU BM thermal-waiver scope) classification: RSS component; PSS-tracked under ICMS APS_1181415 survey: fiducialised before installation; cannot be re-aligned in place first in-line aperture; limits the transmitted fan to the 0.8 mrad acceptance		new confirm
UpstreamCollimator	Collimator		passive sketch: K1-20 material: Pb first lead bremsstrahlung collimator (reused former insertion-device front-end collimator); immediately downstream of the exit mask		new confirm
WhiteBeamSlit	Slit		cooling: water-cooled (intercepts white beam) defines the horizontal and vertical beam footprint; also a vacuum conductance limit sufficient to maintain control during a downstream breach		new confirm
FilterUnit	Filter		sketch: F3-30 materials: Si, Ge, and Cu filter media in two selectable banks cooling: water-cooled banks: Bank 1 (Open / Si 1000 / Ge 330 / Ge 830 / Cu 2000 um); Bank 2 (Open / Si 1000 / Ge 500 / Ge 1000 / slot 5 TBD um); combining gives Si 1000/2000, Ge 330/500/830/1000/1330/1830, Cu 2000 um equivalent (FILTER-1) modified F3-30 carriage reused from 1-ID; filters the white beam to the desired spectrum and reduces downstream heat load		new confirm
BeamlineVacuum	Vacuum		vacuum: UHV, ion-pumped, no water-to-vacuum joints (APS Engineering Standard APS_2018473) gate valve: isolates 19-BM-A from the rest of the beamline; interlocked to vacuum sensors and coordinated with the FE exit valve by the BLEPS (ICMS APS_2388098) (BLEPS-1) the vacuum system and its isolation gate valve, recorded as a Supply(kind=Vacuum) observation rather than an actuatable Asset, following 2-BM		new confirm
DownstreamCollimator	Collimator		passive sketch: A359-K2 material: Pb second lead bremsstrahlung collimator, after the gate valve (reused first-collimator assembly from the previous 19-BM beamline)		new confirm