2015 Dec CHARA AO Run JDM: Difference between revisions

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** The whole gang (mike, theo, chris) going to lab to figure this darn thing out and get rid of the vignetting. We don't want to start our engineering with a compromised beam!
** The whole gang (mike, theo, chris) going to lab to figure this darn thing out and get rid of the vignetting. We don't want to start our engineering with a compromised beam!
* rest of night was taken trying to check S2 beam train and getting a great starting alignment.  but lots of problems.
* rest of night was taken trying to check S2 beam train and getting a great starting alignment.  but lots of problems.
---
2015 Dec 7 (monday)
---
2015 Dec 8 (tuesday)
---
2015 Dec 9 (wednesday)
Following troubles of previous night, Mike, Judit, Laszlo, Matt, John all worked to align S1 WFS.
Here is a modified procedure:
Use Red Laser and blank glass for dicroic
1. With no TWFS hardware in the way, adjust beacon to be centered in the acquisition hole and in center of the focus range. This is done using a cardboard target attached behind the TWFS.  Mark optical axis center on the cardboard
2. Put in collimator.  Focus and adjust to maintain the optical path by hitting the mark on the cardboard.  Check that collimator is in middle of its range (+/-40000 counts).
3. Put on camera plate. Adjust the tilt using flat mirror (or use the mirror in the 1/2" lens tube that comes with alignment kit).
4. Put paper target on back cam to find optical center (or use the target on front of 1/2" plug that plugs into the hole, that comes with alignment kit).  Adjust WFS X,Y to center beam onto this target.
5. Put on lenslets.  screw in telecentric relay (which should have been already focused)
6. Put on camera. Use range of motion allowed by the screws to center light at (45,45) on the detector.  (see camera settings)
7. Spin lenslets. find the rotation axis.  Try to move the rotation axis to the center of the pupil (secondary obstruction) as allowed by the loose screws that attach the lenslets. 
8. Fine tune or do final correction by moving WFS x,y to lenslet rotation axis to the secondary obstruction.  If this required a large move, then 'move back' the light to be centered at (45,45) by using the collimator.
9. adjust collimator focus (by hand) to fill the lenslets as expected.  nominally 10.7 pixels between spots.
Looks much better now.

Revision as of 07:31, 10 December 2015

2015 Dec 5 (saturday)

matt and I arrived.

Plan (part 1)

  • Install optics in the 5 remaining Telescope WFS
  • Align Tel WFS in Tel S1


2015 Dec 6 (sunday)

  • Mike and Theo arrived. will have group meeting later today to plan next few days.
  • installed ANDOR software SOLIS on the UM laptop (ASUS)
  • located all optics
  • plan to setup test rig for aligning the lens tube telecentric re-imager


9:30pm.

We are going on sky.

  • Discovery 1. M10 alignment shows some vignetting.
    • Chris using combination of periscope + M10 to try to fix. But didn't work
    • The whole gang (mike, theo, chris) going to lab to figure this darn thing out and get rid of the vignetting. We don't want to start our engineering with a compromised beam!
  • rest of night was taken trying to check S2 beam train and getting a great starting alignment. but lots of problems.

--- 2015 Dec 7 (monday)

--- 2015 Dec 8 (tuesday)

--- 2015 Dec 9 (wednesday)

Following troubles of previous night, Mike, Judit, Laszlo, Matt, John all worked to align S1 WFS.

Here is a modified procedure: Use Red Laser and blank glass for dicroic

1. With no TWFS hardware in the way, adjust beacon to be centered in the acquisition hole and in center of the focus range. This is done using a cardboard target attached behind the TWFS. Mark optical axis center on the cardboard

2. Put in collimator. Focus and adjust to maintain the optical path by hitting the mark on the cardboard. Check that collimator is in middle of its range (+/-40000 counts).

3. Put on camera plate. Adjust the tilt using flat mirror (or use the mirror in the 1/2" lens tube that comes with alignment kit).

4. Put paper target on back cam to find optical center (or use the target on front of 1/2" plug that plugs into the hole, that comes with alignment kit). Adjust WFS X,Y to center beam onto this target.

5. Put on lenslets. screw in telecentric relay (which should have been already focused)

6. Put on camera. Use range of motion allowed by the screws to center light at (45,45) on the detector. (see camera settings)

7. Spin lenslets. find the rotation axis. Try to move the rotation axis to the center of the pupil (secondary obstruction) as allowed by the loose screws that attach the lenslets.

8. Fine tune or do final correction by moving WFS x,y to lenslet rotation axis to the secondary obstruction. If this required a large move, then 'move back' the light to be centered at (45,45) by using the collimator.

9. adjust collimator focus (by hand) to fill the lenslets as expected. nominally 10.7 pixels between spots.

Looks much better now.

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