X23A2 Harmonic Rejection Mirror

Motor names

• HOS-z : Vertical translation

• HOS-rot: Rotation angle

• HOS stands for "Harmonic Order Sorter"

Setting the mirror

1. To translate the mirror entirely out of the beam, drop it by 10 mm (i.e. 10 mm in the negative direction.

2. To bring the mirror into the beam, return it to 0.

3. To level the mirror (i.e. make it flat), use the bubble level from the tool box. It's good enough.

4. Set the entrance slits to about 1 mm vertically (unless at a very high energy and very steep mirror angle)

5. Adjust HOS-rot to cut off about half the beam

6. Scan HOS-rot from 0 to ??? to find the critical angle

7. The ion chambers must be physically raised to meet the exit angle of the beam.