Skip to content

Detector

Detection at both i10 endstations is point, current-integrating, and modelled. Unlike i06, whose recording detectors were absent from dodal, i10's detection IS present: the channels read through current amplifiers, so this page binds them now. PVs read from dodal, carried confirm.

i10 has two endstations and one detection shape: read the beam as a current, not as an image. RASOR scatters and reflects soft X-rays and reads the scattered-beam point detector plus the incident-flux, fluorescence, and drain-current channels through current amplifiers; i10-1 measures dichroism in an applied field and reads the total-electron-yield, fluorescence, diode, and monitor channels. No area detector exists at either station. So the science detector at each endstation binds the catalog FluxMonitor Family rather than a camera or an area-detector Family, and that is an honest description of the hardware, not a placeholder. The geometry around the detector, the RASOR two-theta scattering arm and the reciprocal-space axis, rides the diffractometer on the sample side and is modelled there. The detection channels live in the detection stage of the descriptor.

RASOR point detection (ME01D)

The RASOR endstation is a soft X-ray diffractometer and reflectometer. The signal it records is the current from a point detector in the scattering plane, normalized against the incident flux, with fluorescence and drain-current channels read alongside. dodal exposes these as scaler channels through Femto / SR570 current amplifiers; the scaler is a Struck counting unit. CORA binds the set as one science Detector on the catalog FluxMonitor Family (DET-1).

Device Family Role Channel Notes
Detector FluxMonitor Sensor scaler S18 scattered-beam point detector; the RASOR scattering / reflectivity signal (DET-1)
Detector (I0) FluxMonitor Sensor scaler S17 incident-flux monitor the signal is normalized against (DET-1)
Detector (FY) FluxMonitor Sensor scaler S19 fluorescence channel (DET-1)
Detector (TEY) FluxMonitor Sensor scaler S20 drain-current / total-electron-yield channel (DET-1)
Diffractometer (two-theta arm) Goniometer Positioner ME01D-MO-DIFF-01 the two-theta scattering arm that places the point detector; part of the sample-side goniometer (DIFF-1)
ReciprocalSpace PseudoAxis Axis over the RASOR circles reciprocal-space axis driving the circles to a reflection; sits over the diffractometer, not the detector (DIFF-2)
DetectorSlit Slit Positioner ME01D-MO-APTR-0 detector-side baffle slit (STAGE-1)

How this maps onto CORA:

  • The four channels are one FluxMonitor Detector, read through current amplifiers. S18 is the scattered-beam point detector, S17 the incident-flux monitor, S19 fluorescence, and S20 the drain-current / total-electron-yield channel, all integrated currents through Femto / SR570 amplifiers onto a Struck scaler. They are the same device kind as the FluxMonitor Family; which channel is the primary signal versus an auxiliary monitor is a Method concern, not a Family difference. The per-channel binding and amplifier gain are the open detail (DET-1).
  • The two-theta arm is goniometer geometry, not a detector. The RASOR scattering arm that carries the point detector is part of the Goniometer the diffractometer binds (DIFF-1); it places the detector in the scattering plane. CORA models that arm as the goniometer affordance it is on the sample side, and the FluxMonitor Detector is the separate Asset that the arm carries.
  • The reciprocal-space axis is over the circles, not the detector. ReciprocalSpace reuses PseudoAxis and drives the diffractometer circles to a reflection (DIFF-2). It is a sibling of the incident-energy and polarization pseudo-axes; it tells the mechanics where to point and does not stand in for the detector.
  • The analyzer arm is sample-side, and its crystal is implicit. RASOR's polarization-analysis arm (the PaStage / POLAN arm, ME01D-MO-POLAN-01) carries its own analyzer two-theta and detector. It binds the loose PolarizationAnalyzer Family, held under review (POL-2), and is modelled with the rest of the analyzer mechanics on the sample side; dodal exposes the arm motors only, so no analyzer-crystal specifics are invented here.

i10-1 / I10J point detection (BL10J)

The i10-1 endstation measures X-ray magnetic dichroism with the sample in an applied magnetic field at low temperature. Its detection is again point and current-integrating: the absorption is read as total-electron-yield, fluorescence, diode, and monitor channels. No area detector is present. CORA binds the set as one science MagnetDetector on the catalog FluxMonitor Family (DET-1).

Device Family Role Note
MagnetDetector (TEY) FluxMonitor Sensor drain-current / total-electron-yield channel (DET-1)
MagnetDetector (FY) FluxMonitor Sensor fluorescence channel (DET-1)
MagnetDetector (diode) FluxMonitor Sensor diode channel (DET-1)
MagnetDetector (monitor) FluxMonitor Sensor incident / reference monitor channel (DET-1)

How this maps onto CORA:

  • The dichroism channels are one FluxMonitor Detector. The TEY, FY, diode, and monitor channels are the i10-1 point detection; they reuse FluxMonitor, the same Family the RASOR channels bind. The channel map and amplifier bindings are the open detail (DET-1). There is no area detector at i10-1, so nothing else is coined.
  • The dichroism / resonant signal is read against the polarization axis on the source side. An XMCD or XMLD difference subtracts signal taken at one polarization from signal taken at another. The channels above produce that signal; the axis they are differenced against is the Polarization pseudo-axis over the twin APPLE-II phase rows, modelled on the source side with the value domain LH / LV / PC / NC / LA plus third-harmonic variants, the continuous linear-arbitrary-angle being the realization of the LA value within the same axis (POL-1). See the Beamline source walk.

Why FluxMonitor, not a new detector Family

Both endstations bind the catalog FluxMonitor Family for their science detector, and that is a deliberate modelling decision, not a shortcut.

  • The detection is point and current-integrating. Neither RASOR nor i10-1 records an image. Both read a beam as an integrated current through Femto / SR570 amplifiers onto a scaler, normalized against an incident-flux channel. That is exactly what FluxMonitor describes, so the science detector reuses it rather than coining a synonym.
  • The BMM precedent settles the role nuance. BMM's ion chambers are the primary XAS signal yet still bind FluxMonitor, because the role distinction (primary signal versus auxiliary monitor) is a Method concern, not a Family difference. i10 follows that precedent: a point detector that is the scattering signal and a monitor that normalizes it are the same device kind, separated by their role in a Method, not by Family.
  • No area detector exists, so none is invented (DET-1). Coining a camera or area-detector Family for hardware that has no PV in dodal would leave an orphan in the catalog. If a future area detector appears at either endstation, the science detector migrates to the camera / area-detector Family it then earns, and the FluxMonitor channels stay as the flux and yield monitors they already are. Until then the catalog is unchanged by this deployment, and nothing graduates here.

Families

No new detector Family is coined and nothing graduates. Reused from the catalog: FluxMonitor for the RASOR point detection (the S18 scattered-beam, S17 incident-flux, S19 fluorescence, and S20 drain-current / total-electron-yield channels) and the i10-1 TEY / FY / diode / monitor channels (DET-1); Goniometer for the diffractometer and its two-theta detector arm (DIFF-1); PseudoAxis for the reciprocal-space axis (DIFF-2); Slit for the detector-side slit (STAGE-1). The RASOR analyzer arm binds the loose PolarizationAnalyzer Family, held under review and modelled on the sample side (POL-2). See Sample for the diffractometer, analyzer arm, and stage geometry, Inventory for the full Asset tree, Model for the modelling decisions, Beamline source walk for the polarization axis the dichroism signal is read against, and the Family catalog for the shared definitions.