Techniques¶
What the modelled part of MOGNO is designed to do, as intent. First cut.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. MOGNO runs cone-beam X-ray tomography, which is already in CORA's catalog, so the Method below renders linked and the practice is carried pending until the technique enters scope (TECH-1).
Cone-beam micro and nanotomography¶
MOGNO illuminates the sample with a quasi-monochromatic divergent (cone) beam and records projections as the sample rotates. Because the geometry is cone-beam, moving the sample along the cone between the secondary source and the detector changes the magnification, so a single instrument spans nanotomography (at the elliptical-mirror nanofocus) and microtomography (large field of view) by sample position. Phase contrast comes from propagation over the sample-to-detector distance, and time-resolved (4D) tomography from fast continuous rotation.
| Technique | Catalog method | Notes |
|---|---|---|
| Cone-beam X-ray tomography | tomography |
projections over a rotation on the nanotomography and microtomography stations, hardware-triggered by the TATU timing unit; reuses the graduated tomography Method the APS 2-BM pilot and NSLS-II FXI share; practice pending (TECH-1) |
Tomography at MOGNO needs the rotation axis as the master clock, the TATU trigger to hardware-sync projection acquisition, the detector chain to record the projections plus flat and dark fields, and the cone-beam magnification axis to set the resolution-and-field-of-view working point.
A familiar technique on a third facility¶
MOGNO is the tomography spine reaching a third facility after the APS 2-BM bending-magnet micro-CT pilot and the NSLS-II FXI transmission microscope. It coins no new Method: the same tomography Method covers micro and nano variants, exactly as 2-BM uses it for both. What MOGNO reinforces is not the technique but the surrounding model, the cone-beam magnification as a PseudoAxis, the FPGA trigger as a TimingController, and the seam against a custom (non-Bluesky) orchestration layer.
The streaming and continuous-rotation tomography variants the catalog already carries (streaming_tomography, continuous_rotation_tomography) are plausible for MOGNO's 4D time-resolved work, but are not asserted here without a source; they would be added as practices once staff confirm the acquisition modes.
Not modelled yet¶
The concrete acquisition recipes (the rotation ranges and speeds, the projection counts, the flat and dark field cadence, the per-energy and per-station alignment routines, and the reconstruction parameters) are not written yet; they join as the deployment approaches the point where CORA drives MOGNO. The reconstruction step (ssc-raft on the HPC cluster) is named on Model as the compute axis, not modelled here. See Open questions for the world-facts to confirm first.