Techniques¶
What I15-1 is designed to do, as intent. Design-phase.
A technique is a portable Catalog Method; a Practice is how a facility adapts it. I15-1 does total scattering / pair distribution function (PDF), a new science domain for CORA. Which Methods enter scope is an open question (TECH-1).
| Technique | Beam | Detector | Status in CORA |
|---|---|---|---|
| Total scattering / PDF | fixed-energy, bent-Laue mono | Eiger (Detector Role), wide-Q on the two-theta arm |
new Capability, pending (TECH-1) |
| Autonomous powder/capillary exchange | n/a | n/a | a Procedure over the spine + a Subject custody thread, pending (ROBOT-1) |
A few points of intent shape the model:
- Total scattering is a new Capability, not a new device shape. A PDF measurement captures wide-Q scattering on the Eiger across the two-theta arm at a fixed high energy. The device Roles already exist (Camera presents Detector, the mono and arm present Positioner); what is new is the science Capability binding them. Carried pending on the Diamond Practices (TECH-1).
- Energy scanning is explicitly NOT in scope here. I15-1's bent-Laue monochromator selects a fixed energy: dodal exposes
energy_kevas a read-only readback derived from the crystal y position via a lookup table, not a commanded or swept axis. So the pendingenergy_scanCapability is not earnable from I15-1's source; it must wait for a tunable XAS/EXAFS beamline whose scanning monochromator is actually instantiated in dodal (ENERGY-1). - The autonomous loop reuses the I03 shape. The powder/capillary robot exchange is a Procedure over the spine threaded through the
Subjectaggregate and gated by a Clearance, the same shape as the I03 MX loop, with a powder/capillary twist instead of MX pins (ROBOT-1).
The concrete recipes (q-ranges, exposure, the exchange sequence) are calibration the deployment must supply. See Open questions for what must be confirmed first.