Techniques¶
What the modelled part of P01 is designed to do, as intent. First cut.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. P01 runs hard X-ray dynamics techniques (nuclear resonant scattering and resonant inelastic scattering) that earn no catalog Method today, so the Methods below render unlinked and are carried pending until a technique enters scope (TECH-1).
Nuclear resonant scattering (EH1)¶
P01 sets the X-ray energy onto a Moessbauer isotope's nuclear resonance with the double-crystal monochromator, then carves a meV / Moessbauer-energy bandwidth with the high-resolution monochromator stack (the four nested / channel-cut HRMs). Scanning the high-resolution-monochromator energy axis while reading the time- and energy-resolved detector signal produces the nuclear inelastic / resonant spectrum.
| Technique | Catalog method | Notes |
|---|---|---|
| Nuclear resonant scattering / nuclear inelastic scattering | inelastic_x_ray_scattering |
the high-resolution-monochromator energy scan reading the avalanche-photodiode signal; no catalog Method fits, reuses the IXS slug ESRF ID28 / NSLS-II IXS share, a further consumer (TECH-1) |
Resonant inelastic X-ray scattering (EH3)¶
P01's EH3 endstation focuses the beam with the KB mirror pair onto the sample and analyzes the inelastically scattered photons on the spectrometer arm, scanning the incident energy against the analyzed energy to map the excitation spectrum.
| Technique | Catalog method | Notes |
|---|---|---|
| Resonant inelastic X-ray scattering | resonant_inelastic_scattering |
KB-focused incident beam analyzed on the EH3 spectrometer; reuses the RIXS slug SIX / ESRF ID32 share, a further consumer (TECH-1) |
Diffraction (EH2)¶
P01's EH2 endstation carries a theta / two-theta goniometer reading a detector on a positioning stage, for hard X-ray diffraction. The catalog carries no general diffraction Method today; the technique is noted, not bound, pending confirmation of the endstation's routine use (TECH-1, DIFF-1).
A new technique branch on familiar vocabulary¶
P01 is the fleet's NRS / RIXS dynamics beamline. Its techniques are new to CORA's catalog (which is tomography- and MX-centric today), but they reuse the inelastic- and resonant-inelastic-scattering slugs already carried pending across the fleet (ESRF ID28 IXS, ESRF ID32 / SIX RIXS, NSLS-II IXS), so none forces a new Method to be coined now. The instrument anatomy reuses existing Families end to end: the monochromators bind Monochromator, the KB mirrors Mirror, the lens Transfocator, the stages LinearStage / RotaryStage / Table, the sample circle Goniometer.
Not modelled yet¶
The concrete acquisition recipes (the high-resolution-monochromator energy-scan sequences and their exposures, the RIXS incident-energy scans, the diffraction scans) are not written yet; they join as the deployment approaches the point where CORA drives P01. Whether the NRS / RIXS Methods enter CORA's catalog is an owner-scope decision on Model; see Open questions for the world-facts to confirm first.