Techniques¶
What the modelled part of 8.3.2 is designed to do, as intent. First cut.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. 8.3.2 is a hard X-ray micro-tomography beamline: its techniques reuse Methods CORA's catalog already carries.
Hard X-ray micro-tomography¶
8.3.2 sets the X-ray energy with the monochromator (6,000-43,000 eV from the Superbend source), then rotates the sample on the tomographic rotary stage while the scintillator, objective, and camera record projections. It images non-destructively in 3D at ~1 micron resolution, with absorption and propagation-phase contrast (the detector stack's camera_distance sets the propagation distance).
| Technique | Catalog method | Notes |
|---|---|---|
| Tomography | tomography |
absorption and propagation-phase micro-CT, the rotary stage stepped against the scintillator + camera; reuses the catalog tomography Method (the 2-BM pilot) |
| Continuous-rotation tomography | continuous_rotation_tomography |
fast fly-scan tomography, the rotary stage in continuous rotation as the trigger master (TRIG-1); reuses the catalog continuous-rotation Method |
Tomography needs the incident energy set by the monochromator, the rotary stage and sample positioning, and the scintillator + objective + camera, with the detector stack setting the sample-to-detector propagation distance.
A new Site on familiar vocabulary¶
8.3.2 is the ALS's hard X-ray micro-CT beamline, and it ties into the tomography lineage CORA already models: the same imaging device anatomy as the 2-BM pilot, the NSLS-II FXI design, and the ALBA FAXTOR design (a bending-magnet or insertion-device source, an energy-setting optic, a rotary-stage endstation, and an indirect scintillator + camera detector). It reuses the tomography and continuous_rotation_tomography Methods directly; none forces a new device family.
Not modelled yet¶
The concrete acquisition recipes (the fly-scan tomography sequences and their counting times, the flat / dark sequencing, the propagation-phase setups) are not written yet; they join as the deployment approaches the point where CORA drives 8.3.2. See Open questions for the world-facts to confirm first, in particular which sample-stack axis is the tomographic rotation (ROT-1) and the triggering scheme (TRIG-1).