User Tools

Site Tools


chara:climb_lab_alignment

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
chara:climb_lab_alignment [2020/07/16 19:25]
gail_stargazer
chara:climb_lab_alignment [2020/07/16 19:34] (current)
gail_stargazer
Line 19: Line 19:
   - Keep IR beam 3 shutter only. Cover the fold mirror labeled IR23, and IR123B. Adjust pico7 motors labeled IRBC123 if necessary.   - Keep IR beam 3 shutter only. Cover the fold mirror labeled IR23, and IR123B. Adjust pico7 motors labeled IRBC123 if necessary.
  
-The next part is to verify with the WL source, repeating the same steps, but this time using the CLIMB server and GUI and look at the spots in NIRO. Make sure that no covers are left on the fold mirrors. When looking at the spots with NIRO GUI tab: Pixel Area, when adjusting, you just watch only that spot which was left open in the laser procedure, see the diagram of spots in NIRO on the printed diagram.+The next part is to verify with the WL source, repeating the same steps, but this time using the CLIMB server and GUI and look at the spots in NIRO. Make sure that no covers are left on the fold mirrors. When looking at the spots with NIRO GUI tab: Pixel Area, when adjusting, you just watch only that spot which was left open in the laser procedure. See the diagram of spots in NIRO on the printed diagram.
  
 ==== Example of How to Recover the Alignment of IRBC23: ==== ==== Example of How to Recover the Alignment of IRBC23: ====
  
-Diagnosing Problem: Following the steps above using the green laser on the CLIMB table and the white light source with the pixel area of the NIRO detector. When looking at the light from Beam 3 only, light appeared on pixel 123A and 123B, but not on 23. Light from Beam 2 only appeared in 23, but not in 123A and 123B. Comparing with the CLIMB layout diagram, this indicated a problem with IRBC23.+Diagnosing Problem: Follow the steps above using the green laser on the CLIMB table and the white light source with the pixel area of the NIRO detector. When looking at the light from Beam 3 only, light appeared on pixel 123A and 123B, but not on 23. Light from Beam 2 only appeared in pixel 23, but not in 123A and 123B. Comparing with the CLIMB layout diagram, this indicated a problem with IRBC23.
  
 To recover IRBC23, use the green laser first To recover IRBC23, use the green laser first
Line 31: Line 31:
   - Put onto the fold mirror labeled IR23 the round paper target (lying around the table nearby) to see how badly the beam splitter is misaligned. The laser beam does not have to be perfectly centered on that loose target. If it is way off, perhaps partially missing the fold mirror, then move the IRBC23 actuators by hand to roughly center on the fold mirror. At this point when you remove the paper target from the fold mirror, you should be able to see a green spot shining on the cold stop behind NIRO window. Then all that needs to be done is to get that spot into the hole in the middle of the cold stop. Make sure that the picomotors on IRBC23 are controlling the beam, in other words, the actuators are pressed against the flex mount.   - Put onto the fold mirror labeled IR23 the round paper target (lying around the table nearby) to see how badly the beam splitter is misaligned. The laser beam does not have to be perfectly centered on that loose target. If it is way off, perhaps partially missing the fold mirror, then move the IRBC23 actuators by hand to roughly center on the fold mirror. At this point when you remove the paper target from the fold mirror, you should be able to see a green spot shining on the cold stop behind NIRO window. Then all that needs to be done is to get that spot into the hole in the middle of the cold stop. Make sure that the picomotors on IRBC23 are controlling the beam, in other words, the actuators are pressed against the flex mount.
  
-After that you should be able to see all three WL spots in NIRO from Beam 2 and also from Beam 3.+After that you should be able to see all three WL spots in NIRO from Beam 2 and also from Beam 3. Use the pixel area of the detector and the alignment readouts from the CLIMB GTK to align the light into the correct pixels using the original 5 steps listed above.
  
 **TIPS** **TIPS**
Line 37: Line 37:
 If moving IRBC23 using the pico7 gui does not change the alignment, then the flex mount is not touching the actuator. Push on the mount and then turn the knob by hand. Confirm that the picomotor can control the motion again. If moving IRBC23 using the pico7 gui does not change the alignment, then the flex mount is not touching the actuator. Push on the mount and then turn the knob by hand. Confirm that the picomotor can control the motion again.
  
-If you have trouble figuring out whether the laser is going through the hole in the middle of the cold stop, you can place the cover on NIRO. Looking at Beam 3, compare the location of the spot coming from the fold mirrors IR123A, IR123B, and IR23. Move the misaligned optic until it overlaps with the other beams. This could bring the light close enough so that it appears on the pixel area of the detector. Then the remainder of the alignment can be done by aligning to the spots on the dectector using the 5 Steps listed above.+If you have trouble figuring out whether the laser is going through the hole in the middle of the cold stop, you can place the cover on NIRO. Looking at Beam 3, compare the location of the spot coming from the fold mirrors IR123A, IR123B, and IR23. Move the misaligned optic (e.g., IRBC23 in the example above) until it overlaps with the other beams. This could bring the light close enough so that it appears on the pixel area of the detector. Then the remainder of the alignment can be done by aligning to the spots on the dectector using the 5 Steps listed above.
  
  
chara/climb_lab_alignment.1594941955.txt.gz ยท Last modified: 2020/07/16 19:25 by gail_stargazer