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ao:labao_alignment [2018/07/06 13:37]
127.0.0.1 external edit 		ao:labao_alignment [2018/07/07 09:24]
jones [Notes from tests of LABAO and TWFS alignment 2015-12-07]
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-====== __LABAO Alignment Proceedures__ ======+====== LABAO Alignment Proceedures ======
 \\  \\ 
 ===== Periodic Alignment of LABAO and BRT 2015_12_08 (TtB) ===== ===== Periodic Alignment of LABAO and BRT 2015_12_08 (TtB) =====
 \\  This is the proceedure we used to check the alignment of the S2 LABAO-BRT system today.\\ \\  1. Ensure that the green laser is well aligned coming out of the visible table and hitting both the target on the IR table and the target at the north end of the lab. This is most important, and if something seems odd, recheck this alignment.\\ \\  2. Use the "AUTOALIGN" routine on LABAO to adjust the dichroic on the beam sampler.\\ \\  3. Use the target normally placed near the BRT secondary to check that it is the correct height near the Beam Sampler Dichroic. In all of this we are assuming that the X/Y is OK. IN rare circumstances you may have to adjust the height of the target.\\ \\  4. Move this target as close to the rear of the BRT as possible and check that the beam is parallel to the table. If not, adjust the BS Dichroic ONLY VERTICALLY, to fix this.\\ \\  5. Place the target right in front of the LABAO-DM, and adjust the spherical mirror to ensure the beam is at the correct height on the target.\\ \\  6. Visually inspect the LABAO-DM surface and check the beam is well centered in XY and if necessary adjust the spherical mirror in X/Y\\ \\  7. Place the target in it's "standard" position in front of the BRT secondary and adjust the DM in tip/tilt to center the target.\\ \\  8. Go back to the LABAO software, open the reference flat shutter and ensure that the LABAO software is set to "Ref" and not "Beacon" and check that it reports no tip/tilt error. If it does, and it probably will, zero the centroids and check again.\\ \\  9. Cover the LABAO WFS-CCD and place the flat mirror on the kinematic mount near the BRT primary. Autocollimate the laser light with this mirror as best you can.\\ \\  10. Use the theodolite to ensure that the blue LED (which plugs into the RED laser collilmator) and the green laser are co-aligned. Fix this if necessary.\\ \\  11. Close the laser shutter, uncover the WFS-CCD and ensure that the LABAO software is set to BEACON. Check that the boxes are well centered. If not, zero the box positions.\\ \\  12. It is now wise to double check that both the laser, reflecting of the reference mirror with the LABAO software set to Ref, and the blue LED, reflecting from the auto-collimating mirror and the LABAO software set to Beacon, both report very little tip/tilt error. At this point save these positions as the defaults.\\ \\  13. Remove the auto-collimating mirror, cover the WFS-CCD, and place the BRT secondary target next to the BRT secondary. Check that the vertical center of the BRT secondary is at the correct beam height and adjust if necessary. It's a good idea to first write down where it is. Do not move it vertically.\\ \\  14. Place the target in front of the BRT primary and check that the beam height is correct there also. If not adjust the vertical tilt of the BRT secondary. Do not move it horizontally.\\ \\  15. Using the standard rail target check the position of the beam on the front and the angle of the beam on the back. The position should be close, the angle may be far off. Adjust the BRT primary to get the angle correct.\\ \\  16. It should now be very close. You may need to iterate between the BRT secondary and primary tip/tilt to get the beam at the right position and the right angle.\\ \\  17. If you wish to be conservative go back to step 1 and check the the laser is being sent out at the right angle. If not start checking it all again.\\ \\  \\  This is the proceedure we used to check the alignment of the S2 LABAO-BRT system today.\\ \\  1. Ensure that the green laser is well aligned coming out of the visible table and hitting both the target on the IR table and the target at the north end of the lab. This is most important, and if something seems odd, recheck this alignment.\\ \\  2. Use the "AUTOALIGN" routine on LABAO to adjust the dichroic on the beam sampler.\\ \\  3. Use the target normally placed near the BRT secondary to check that it is the correct height near the Beam Sampler Dichroic. In all of this we are assuming that the X/Y is OK. IN rare circumstances you may have to adjust the height of the target.\\ \\  4. Move this target as close to the rear of the BRT as possible and check that the beam is parallel to the table. If not, adjust the BS Dichroic ONLY VERTICALLY, to fix this.\\ \\  5. Place the target right in front of the LABAO-DM, and adjust the spherical mirror to ensure the beam is at the correct height on the target.\\ \\  6. Visually inspect the LABAO-DM surface and check the beam is well centered in XY and if necessary adjust the spherical mirror in X/Y\\ \\  7. Place the target in it's "standard" position in front of the BRT secondary and adjust the DM in tip/tilt to center the target.\\ \\  8. Go back to the LABAO software, open the reference flat shutter and ensure that the LABAO software is set to "Ref" and not "Beacon" and check that it reports no tip/tilt error. If it does, and it probably will, zero the centroids and check again.\\ \\  9. Cover the LABAO WFS-CCD and place the flat mirror on the kinematic mount near the BRT primary. Autocollimate the laser light with this mirror as best you can.\\ \\  10. Use the theodolite to ensure that the blue LED (which plugs into the RED laser collilmator) and the green laser are co-aligned. Fix this if necessary.\\ \\  11. Close the laser shutter, uncover the WFS-CCD and ensure that the LABAO software is set to BEACON. Check that the boxes are well centered. If not, zero the box positions.\\ \\  12. It is now wise to double check that both the laser, reflecting of the reference mirror with the LABAO software set to Ref, and the blue LED, reflecting from the auto-collimating mirror and the LABAO software set to Beacon, both report very little tip/tilt error. At this point save these positions as the defaults.\\ \\  13. Remove the auto-collimating mirror, cover the WFS-CCD, and place the BRT secondary target next to the BRT secondary. Check that the vertical center of the BRT secondary is at the correct beam height and adjust if necessary. It's a good idea to first write down where it is. Do not move it vertically.\\ \\  14. Place the target in front of the BRT primary and check that the beam height is correct there also. If not adjust the vertical tilt of the BRT secondary. Do not move it horizontally.\\ \\  15. Using the standard rail target check the position of the beam on the front and the angle of the beam on the back. The position should be close, the angle may be far off. Adjust the BRT primary to get the angle correct.\\ \\  16. It should now be very close. You may need to iterate between the BRT secondary and primary tip/tilt to get the beam at the right position and the right angle.\\ \\  17. If you wish to be conservative go back to step 1 and check the the laser is being sent out at the right angle. If not start checking it all again.\\ \\ 
-===== Notes from tests of LABAO and TWFS alignment 2015-12-07: [[/file/view/LABAO%20Alignment%20Notes%202015%2012%2007.pdf/569505399/LABAO%20Alignment%20Notes%202015%2012%2007.pdf|LABAO Alignment notes 2015-12-07 (TtB)]] =====+===== Notes from tests of LABAO and TWFS alignment 2015-12-07 ===== 
 +{{ao:LABAO_Alignment_Notes_2015_12_07.pdf|LABAO Alignment notes 2015-12-07 (TtB)}}
 \\  \\ 
 ===== Initial Alignment of LWFS - Mike Ireland, 7 Dec 2015 ===== ===== Initial Alignment of LWFS - Mike Ireland, 7 Dec 2015 =====
ao/labao_alignment.txt · Last modified: 2018/07/07 09:25 by jones

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