Techniques¶
What the modelled part of ID32 is designed to do, as intent. First cut.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. ID32 runs three soft X-ray techniques, all new to CORA's catalog, so the Methods below render unlinked and are carried pending until a technique enters scope (TECH-1).
Resonant inelastic X-ray scattering, magnetic dichroism, emission¶
ID32 sets the X-ray energy and polarization with the twin APPLE-II undulators and the plane-grating monochromator, then either disperses the inelastically scattered beam on a long spectrometer arm (RIXS), or measures the absorption asymmetry between polarizations in a high magnetic field (XMCD), or disperses the emitted beam (XES).
| Technique | Catalog method | Notes |
|---|---|---|
| Resonant inelastic X-ray scattering | resonant_inelastic_scattering |
the roughly 5 m dispersive spectrometer arm on the RIXS endstation, scanned in energy against the incident-energy axis; reuses the SIX RIXS Method, the second consumer; Method not yet in the catalog |
| X-ray magnetic dichroism | xmcd |
absorption asymmetry in the 9 T XMCD magnet between circular / linear polarizations set on the APPLE-II; reuses the 4-ID / i06 / i10 dichroism Method; pending |
| X-ray emission spectroscopy | xas_spectroscopy |
the XES Rowland arm at the XMCD endstation; reuses the xas_spectroscopy Method that ISS / LCLS-MFX left pending for XES; pending |
RIXS needs the incident-energy and polarization axes, the RIXS diffractometer to set the scattering geometry, and the dispersive spectrometer arm and its CCD. XMCD needs the polarization axis, the 9 T magnet and its VTI, and a detection channel. XES needs the emission spectrometer arm.
A new operating axis for the fleet, on familiar vocabulary¶
RIXS at ID32 is the fleet's second soft X-ray RIXS after SIX, and the dispersive spectrometer arm is the device that ties them together: the same SpectrometerArmsController anatomy that SIX coined loose, sighted three times across two sites (the ID32 RIXS arm, the ID32 XES arm, and SIX). That rule-of-three earned the graduation of the SpectrometerArm Family, which has since landed as a catalog Family (SIX + ID32 RIXS/XES + ID28; see Model). XMCD and XES likewise reuse the dichroism and emission Methods the fleet already carries pending; none forces a new device family.
Not modelled yet¶
The concrete acquisition recipes (the RIXS energy maps and arm alignment, the XMCD field-and-polarization sequences, the XES scans, and the counting times) are not written yet; they join as the deployment approaches the point where CORA drives ID32. Whether RIXS, XMCD, and XES enter CORA's catalog is an owner-scope decision on Model; see Open questions for the world-facts to confirm first.