Techniques¶
What the modelled part of P09 is designed to do, as intent. First cut.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. P09's resonant-scattering, magnetic-scattering, and dichroism techniques earn no catalog Method today, so the Methods below render unlinked and are carried pending until a technique enters scope (TECH-1).
Resonant elastic X-ray scattering¶
P09 tunes the incident energy onto an absorption edge (the DCM) and measures the elastically scattered intensity on the six-circle goniometer, with the phase retarder setting incident polarization and the analyzer resolving the scattered polarization.
| Technique | Catalog method | Notes |
|---|---|---|
| Resonant elastic X-ray scattering | resonant_scattering |
edge-tuned elastic scattering on the six-circle diffractometer + PerkinElmer / Pilatus, with polarization analysis; reuses the resonant_scattering slug 4-ID / i06 / i10 share, a further consumer (TECH-1) |
Magnetic scattering and dichroism¶
P09's MAG endstation applies a 14 T field to the sample and measures the magnetic scattering / dichroism, with the phase retarder switching incident polarization for XMCD.
| Technique | Catalog method | Notes |
|---|---|---|
| Magnetic scattering | magnetic_scattering |
scattering in the 14 T high-field magnet; reuses the magnetic_scattering slug, a further consumer (TECH-1) |
| X-ray magnetic circular / linear dichroism | xmcd |
dichroism in the 14 T magnet with the phase retarder setting polarization; reuses the xmcd slug 4-ID / i06 / i10 share, a further consumer (TECH-1) |
A polarization / magnetism beamline on the 4-ID vocabulary¶
P09 is the fleet's resonant-scattering and high-field-magnetism beamline. Its techniques are new to CORA's catalog (no resonant / magnetic Method is earned yet), but they reuse the slugs the APS 4-ID deployment and the Diamond i06 / i10 beamlines already carry pending, so none forces a new Method now. Crucially, the instrument anatomy reuses the polarization / magnetism Families 4-ID introduced: the phase retarder binds the catalog PhaseRetarder and the analyzer the catalog PolarizationAnalyzer (graduated across 4-ID / i10 / ID32 / P09, presenting Positioner), while the 14 T magnet binds the graduated catalog Magnet (earned across 4-ID + i10-1 + ID32), a further consumer. For PhaseRetarder, P09 was the rule-of-three signal (with P22) that earned it into the catalog. All recorded on Model.
Not modelled yet¶
The concrete acquisition recipes (the energy / diffractometer / field scan sequences, the polarization-switching dichroism loops) are not written yet; they join as the deployment approaches the point where CORA drives P09. Whether the resonant / magnetic Methods enter CORA's catalog is an owner-scope decision on Model; see Open questions for the world-facts to confirm first.