Table 4. Refinement procedure (expanding mode).
As Table 3 ▸, except that not all sensors are refined at each level. Instead, sensors are added in order of increasing radial distance from the detector center. For example, in the first refinement step reflections from sensor 1 of each quadrant are used to refine the detector as a whole. In the second refinement step, the same reflections are used to refine the quadrants individually. In the third, sensors 0 and 1 from the four quadrants are refined individually, and so forth until all 32 sensors are refined in the last step.
| Level | Sensors | Fix | Refine | Constraints |
|---|---|---|---|---|
| Detector | 1 | τ1, τ2, τ3 | Distance, Shift1, Shift2 | None |
| Quadrants | 1 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7, 3 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7, 3, 2 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7, 3, 2, 6 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7, 3, 2, 6, 4 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |
| Sensors | 1, 0, 7, 3, 2, 6, 4, 5 | τ1group1, τ2, τ3 | Distance, τ1, Shift1, Shift2 | Coplanar |