Guard stage¶
Drawing of the guard stage looking upstream with the 4 different B4C blades. From CAD File.
The guard stage is used to cut off stray light coming down the beamline and
is shown with its cover removed in guard-stage-motor-direction. The
motor positive direction of each of the four independent B4C blades is given
in the table below:
Motor table:
| Stage Motor | Blade (view downstream) | Positive motion |
|---|---|---|
| 1 | bottom | +Y |
| 2 | right | +X |
| 3 | top | +Y |
| 4 | left | +X |