Detector

The Eiger2 area detector and its table plus 2theta arm, the ion chambers and the DAC photodiode, the XGLab Dante MCA, and the fibre sample illumination at 13-ID-D. Scaffold; device-to-PV reconstruction from the GSECARS EPICS support tree, carried at medium confidence.

13-ID-D measures monochromatic powder and single-crystal X-ray diffraction off a sample held in a diamond anvil cell. The detection side reads the scattered beam on an area detector, monitors the incident and transmitted flux through ion chambers and a photodiode, and carries a fluorescence MCA alongside. Every device here reuses a catalog Family: the novelty of this beamline is the high-pressure sample environment (the new loose PressureCell family, see Sample), not anything on the detection axis. The cell's in-situ pressure and temperature metrology detector, the LightField spectrometer, is a Sample-side device, not a detection-chain detector; it reads the cell, not the diffracted beam.

Detection chain

Device	Family	Design spec / note
AreaDetector	Camera	the Eiger2 X 9M area detector (13EIG2_9M:), the primary diffraction detector; the Pilatus 1M CdTe and Si units (13PIL1MCdTe:, 13PIL1MSi:) are alternative area detectors exchanged onto the same role (DET-1)
DetectorStage	LinearStage + TiltStage	the detector table and 2theta arm; the table translates and the arm tilts. The 2theta swing transform would bind a PseudoAxis, but its prefix was seen only in a Galil test template, so the binding is deferred, not invented (DET-1)
FluxMonitor	FluxMonitor	the ion chambers over a USB-CTR multi-channel scaler (13IDD:scaler1) and the DAC photodiode (13IDD:Photodiode), for incident and transmitted flux (DET-1)
FluorescenceDetector	EnergyDispersiveSpectrometer	the XGLab Dante MCA (13IDD_Dante1:), an energy-dispersive fluorescence detector (DET-1)
SampleIllumination	Backlight	the fibre sample illumination (13IDD:US_IllumOnOff), a loose Backlight (DET-1)

The chain reads outward from the sample. The diffracted beam lands on the Eiger2 X 9M area detector, which reads out per pixel; the Pilatus 1M CdTe and Si units are alternative area detectors that take the same role when a different sensor or energy range is wanted, so they bind the same Camera Family and differ as a per-Asset setting (DET-1). The detector table carries the detector and translates it, while the 2theta arm tilts it to set the scattering angle; the arm's table translation and tilt are catalog axes (LinearStage, TiltStage), and the 2theta swing as a single derived angle would bind a PseudoAxis, deferred because its prefix appears only in a Galil test template (DET-1). The ion chambers, counted over the USB-CTR multi-channel scaler, and the DAC photodiode monitor the incident and transmitted flux for normalization (DET-1). The XGLab Dante MCA collects energy-dispersive fluorescence alongside the diffraction (DET-1), and the fibre illumination lights the sample for visual alignment (DET-1).

Why no new detector family

The detection axis tempts no new device class. The Eiger2 and the Pilatus units are conventional area detectors and bind the catalog Camera, reusing the existing scattering anatomy; which sensor sits in the beam (Eiger2 X 9M, Pilatus 1M CdTe, or Pilatus 1M Si) is a per-Asset setting on the one detector role, not a new Family per model (DET-1).

The flux side, the ion chambers over the scaler and the DAC photodiode, binds the catalog FluxMonitor, the same shape every other APS flux monitor carries; these are current-integrating monitors read for normalization, and role is a Method concern, not a Family difference (DET-1).

The fluorescence MCA is the one device that could read as a candidate for a coined family, so the reuse argument is worth making explicitly. The XGLab Dante is an energy-dispersive fluorescence detector, the same anatomy as the multi-element fluorescence detectors at 2-ID and 7-BM, and it binds the same catalog EnergyDispersiveSpectrometer they already use. This is precedent reuse, not novelty: a new vendor for an existing detector shape earns no new Family (DET-1).

The detector table and 2theta arm decompose into ordinary translation and tilt axes (LinearStage, TiltStage); the 2theta swing as a derived angle is a PseudoAxis transform held back rather than invented, because the only prefix seen for it was a Galil test template (DET-1). The fibre illumination is a plain loose Backlight. None of these is a new device class.

The net result is zero new families on the detection axis. The one new family this deployment coins, the loose PressureCell, sits on the Sample side for the high-pressure cell, and the entire diffraction spine, detection included, is catalog reuse (see Model).

Families

Reused from the catalog: Camera (the Eiger2 X 9M and the Pilatus 1M CdTe and Si area detectors), FluxMonitor (the ion chambers over the USB-CTR scaler and the DAC photodiode), EnergyDispersiveSpectrometer (the XGLab Dante MCA, the 2-ID / 7-BM precedent), LinearStage and TiltStage (the detector table and 2theta arm), and the loose Backlight (the fibre sample illumination). No new family is coined on the detection axis, and nothing graduates; the catalog is unchanged. The open detail is the device-to-PV reconstruction, rougher here because the source is the EPICS-native GSECARS support tree rather than a Python device roster (DET-1), and the deferred 2theta PseudoAxis binding (DET-1). See Inventory for the Asset tree and Model for the no-new-family argument across the whole instrument.