Felice cavity alignment

FELICE Cavity alignment

Molecular beam

Ingredients

• 5mW HeNe laser

Procedure

1. Insert the beam splitter.
2. Using screens 7S21 and 7S41, check that the incoming beam is well aligned on the respective holes. (adjustment can only be done by entering the vault).
3. Remove screen 7S41.
4. If necessary (normally not the case), adjust downstream mirror to put the reflected beam on the hole of 7S21.
5. Remove screen 7S21.
6. Insert screen 7S50 .
7. Purposely misalign end mirror; remember/write down original position.
   1. 
8. Align spot on screen using upstream mirror.
9. Re-position End Mirror, and align the back reflection onto the screen.
10. Remove 7S50 and insert screen 7S60.
11. Align spot on screen using Angle Mirror .
    1. 
12. Remove 7S60 and insert screen 7S41.
13. Fine adjust End Mirror to overlay reflected spot on hole. (P.S. instead of step 12 and 13 one can also do the following: Overlay the large, rather vague spot that should also be visible on 7S60 with the hole using the End Mirror steering)
14. Retract screens & HeNe; Start gun.
15. Find cavity zero; enter this position in CL detune Felice, and set it to a reasonable detuning (e.g. 1.5).
16. Enable Remote access and detune ON.

FTICR

1. use downstream to align on 7S70
2. use angle to align on 7S80
3. use end mirror to align on 7S21
4. use upstream to align on 7S41

References and Notes

position of screens in the FELICE beamline

Free-electron laser for Intra-Cavity Experiments