13-ID-D

The GSECARS high-pressure X-ray diffraction beamline at APS Sector 13, and CORA's first extreme-conditions sample environment: monochromatic powder and single-crystal diffraction on a sample held in a diamond anvil cell under extreme pressure and double-sided laser heating. This page walks the operational core CORA models today. It is a reverse-engineered first cut, not yet a running model.

Property	Value
Asset	13-ID-D (root Asset, tier = Unit, parent_id = None)
Facility	APS (bound via facility_code = "aps", FacilityKind = Site)
Sector	Sector 13 (GSECARS / GeoSoilEnviroCARS; not a registered Asset)
Status	First cut, reverse-engineered, design-phase (descriptor + docs; scenarios deferred)
Source	The shared 13-ID-A first optics, observed in the 13-ID-optics zone (MONO-1, SRC-1)
Control stack	APS EPICS (GSECARS runs EPICS plus SPEC plus Python orchestration; the same floor as the other APS beamlines); handles bound from the support tree, carried confirm (CTRL-1)

First cut, and confirm-pending by intent

This scaffold was reverse-engineered from the GSECARS EPICS support tree (CARS-UChicago/GSECARS-EPICS): the iocBoot startup scripts, the CARSApp/Db device templates, and the CARSApp/op/adl MEDM screens. This is an EPICS-native source, not a dodal or BITS Python device roster, so the device-to-PV reconstruction is rougher and is carried at medium confidence until 13-ID-D staff verify it. EPICS PVs read from the support tree are real; vendor part numbers, serials, physical positions, and pressure / temperature regimes are not in the tree and are open questions. What CORA needs the team to confirm is on Open questions.

What makes 13-ID-D different

13-ID-D is CORA's first extreme-conditions deployment, the first instrument in the fleet whose sample sits in a high-pressure environment. The fleet has modelled thermal sample environments (the graduated TemperatureController), magnetic ones (the loose Magnet), and pump-probe lasers (the loose Laser), but never a high-pressure one. This is the axis the EMA scout flagged the fleet lacked.

The sample lives in a diamond anvil cell (DAC). The anvils are squeezed by a gas membrane driven by a GE/Druck PACE5000 pneumatic controller (13IDD_PACE5000:PC1:Setpoint / Pressure_RBV); the sample is heated from both sides by two IPG YLR fibre lasers (13IDD:Laser1 / Laser2, power 13IDD:US_LaserPower / DS_LaserPower); and the pressure and temperature are read optically in situ (thermal-emission spectroradiometry for temperature, 13IDD:us_las_temp / ds_las_temp; ruby fluorescence, Raman, and Brillouin for pressure). The X-ray probe is otherwise familiar: monochromatic powder and single-crystal diffraction read on an area detector. The novelty is entirely the sample environment.

13-ID-D coins one new loose family, PressureCell, for that high-pressure sample environment. No existing catalog Family covers it. The cell is modelled as one Asset presenting the Regulator Role for its membrane pressure (the PACE5000 setpoint settling to a target); its double-sided laser heating (HEAT-1) and its in-situ pressure / temperature metrology (PRESSURE-1) are capabilities of the same cell, not separate families. Everything else on the diffraction spine reuses the catalog.

Scope: what is and is not modelled

Part	In this cut	Why
Source / optics (13-ID-optics)	Yes	The shared 13-ID-A silicon DCM (MONO-1), the K-B and carbon focusing mirrors (OPT-1), the beam-defining and DAC table-top slits (OPT-2), the clean-up pinhole (APERTURE-1), the attenuator filter (ATTN-1), and the machine-level storage ring (observe-only, MACHINE-1)
High-pressure sample (13-ID-D)	Yes	The diamond anvil cell as one PressureCell Asset, the DAC positioning stage and lift table (SAMPLE-1), and the LightField metrology spectrometer (HP-1)
Detection (13-ID-D)	Yes	The Eiger2 / Pilatus area detector (DET-1), the detector table and 2theta arm (DET-1), the ion-chamber and photodiode flux monitors (DET-1), the XGLab Dante fluorescence MCA (DET-1), and the fibre sample illumination (DET-1)
New device classes	One loose PressureCell	The high-pressure sample environment, held at n=1; nothing graduates; the catalog is otherwise unchanged (see Model)
The heating lasers	Capability of PressureCell, not the Laser family	Heating is a different role from pump-probe; modelled as an open-loop power actuator, not a temperature Regulator (HEAT-1)
The detector 2theta-arm transform	Named, deferred	The swing transform binds PseudoAxis, but its prefix was seen only in a Galil test template, so the binding is deferred, not invented (DET-1)
The laser-safety PLC	Enclosure permit axis, not a device	The Koyo PLC gates laser emission as a laser-emission enclosure permit (LASER-1, PSS-1)
Integration scenarios + vendor Models	No	Design-phase; the descriptor and docs come first

The deferred parts are recorded on Model.

Key modelling decisions

• One new loose family: PressureCell (PRESSURE-1). The high-pressure sample environment has no fleet analog, so it earns one new loose Family, held at n=1 and graduating nothing. The name is deliberately the bare, regime-generic role-noun PressureCell, not HighPressureCell (the qualifier names the regime) nor DiamondAnvilCell (the qualifier names the mechanism, which would force a near-duplicate family for the large-volume press or a clamp cell). PressureCell spans the DAC, the large-volume press, and clamp cells. It is modelled as one Asset presenting the Regulator Role for its membrane pressure, with heating and metrology as capabilities of the same cell. Its rule-of-three triggers are named: HPCAT 16-ID, the 13-BM-D large-volume press, and the 4-ID cell.
• The heating lasers do not bind the Laser family (HEAT-1). CORA binds by Role, not mechanism: heating is a power-delivery / thermal-actuation role, distinct from the pump-probe Laser. The live heating is open-loop on commanded power (13IDD:US_LaserPower / DS_LaserPower) with temperature inferred from emission, so today it is a power actuator, not a temperature Regulator. The upstream and downstream beams are one device with two sides (balanced double-sided heating), not two instances.
• High-pressure diffraction reuses the pending Methods. High-pressure powder diffraction reuses powder_diffraction (shares i11); high-pressure single-crystal diffraction reuses diffraction (shares 4-ID / 8-ID / CSX / i19). High pressure is a Plan-level sample-environment difference (the 4-ID precedent), not a new slug.
• The XRD spine is entirely catalog reuse. The silicon DCM binds Monochromator, the K-B and carbon mirrors bind Mirror, the slits bind Slit, the clean-up pinhole binds Aperture, the attenuator binds Filter, the DAC positioning stage binds Goniometer (the i03 Smargon precedent), the area and metrology detectors bind Camera, the ion chambers and photodiode bind FluxMonitor, the Dante MCA binds EnergyDispersiveSpectrometer, the incident energy binds PseudoAxis, the fibre illumination binds the loose Backlight, and the machine state binds the loose StorageRing.
• The Koyo laser-safety PLC is an Enclosure permit axis, not a device (LASER-1, PSS-1). It gates laser emission as a laser-emission enclosure permit (LASER-1) alongside the PSS search-and-secure permit (PSS-1). The novelty is localized to the sample environment.

The beamline

• Source: the generated device walk: the storage ring (observe-only, MACHINE-1), the shared 13-ID-A silicon double-crystal monochromator (13IDA:, MONO-1), the derived beamline energy (13IDE:En, MONO-1), the K-B and carbon focusing mirrors (OPT-1), the beam-defining and DAC table-top slits (DACV / DACH, OPT-2), the clean-up pinhole and its carriers (APERTURE-1), and the attenuator filter (13IDD:filter:, ATTN-1).
• Sample: the diamond anvil cell as the loose PressureCell (the PACE5000 membrane regulator, the double-sided IPG YLR heating, and the in-situ pressure / temperature metrology), the DAC positioning stage and lift table (SAMPLE-1), and the LightField metrology spectrometer (13IDDLF1:, HP-1).
• Detector: the Eiger2 / Pilatus area detector (DET-1), the detector table and 2theta arm (DET-1), the ion-chamber and photodiode flux monitors (13IDD:scaler1, 13IDD:Photodiode, DET-1), the XGLab Dante fluorescence MCA (13IDD_Dante1:, DET-1), and the fibre sample illumination (13IDD:US_IllumOnOff, DET-1).

Cutting across them:

• Controls: the APS EPICS control stack and the SPEC / Python orchestration seam; the Galil and Newport XPS stage controllers; handles bound from the support tree and carried confirm at medium confidence (CTRL-1).

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 13-ID-D is designed to do, as intent. High-pressure powder diffraction reuses the powder_diffraction Method (shares i11) and high-pressure single-crystal diffraction reuses the diffraction Method (shares 4-ID / 8-ID / CSX / i19); high pressure is a Plan-level sample-environment difference, not a new slug. The 13IDD_powder_diffraction_practice and 13IDD_diffraction_practice Practices render unlinked, carried pending (TECH-1).

Governance

Governance: who will act at 13-ID-D and the trust shape that gates their commands. People and autonomous agents are facility principals at the APS Site; on the beamline they surface through the actions they take, gated by a trust shape (Zone, Conduit, Policy). The APS / GSECARS operator pool and review structure are carried pending at the APS Site, shared across the beamlines (GOV-1). The PSS search-and-secure permit signals are carried pending (PSS-1), plus a laser-safety enclosure permit (the Koyo PLC gating laser emission), carried pending and not invented (LASER-1). This is a hard X-ray beamline plus class-4 heating lasers plus a pressurized gas membrane system; CORA follows the 2-BM governance shape. Clearances are issued at the APS Site, not on the beamline.

Model

Model: the developer's by-kind index and the record of what is deliberately deferred. 13-ID-D coins one new loose Family, PressureCell, held at n=1; the catalog is otherwise unchanged (see Families).

Not yet documented

13-ID-D 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. The detector 2theta-arm transform is named but its live prefix was seen only in a Galil test template, so its PseudoAxis binding is deferred rather than invented (DET-1). The PSS search-and-secure permit signals and the Koyo laser-emission permit logic are carried pending, not invented here (PSS-1, LASER-1).