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--- ao:diary [2018/07/06 13:37]
127.0.0.1 external edit
+++ ao:diary [2018/07/07 09:05] (current)
jones
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+====== Diary ======
 Dec 2015\\  - Theo, Mike, John discussed big picture strategy (TODO list), then tried to follow the standard alignment.\\  - Discovered beam shear, then found large (2-3cm) pupil misalignment and decided to re-align LABAO from scratch. Alignment procedure followed was:\\
@@ Line 6: / Line 7: @@
   - Move the secondary to centre the beam on the rail target.
   - Move the primary to align the beams down the rail. Note that this movement was extremely small
-- The two-hole mask test was difficult because there was only one two-hole mask! This is essential for all telescopes for the current procedure.\\  - No laptop or power supply available for the beacon focusing camera. This needs to live in a standard place and be part of the manual.\\  - Beacon focus was +1,500,000 counts out (i.e. way out by eye) and when it was in focus it looked perfect on the LABAO WFS... except that only half the pupil was illuminated.\\  - Discovered dust on the fiber tip and also vignetting probably due to no POP realignment done after the pupil shift.\\ \\  7 Dec 2015\\  - Theo and Judit again realigned the S2 labao from scratch. This time the beam was parallel to the optical table throughout.\\  - S1 and S2 beacons focused. Mike realised that the dichroic was installed backwards. The pupil shift seen (beacon with YSO dichroic versus M10 alignement) is consistent with this error.\\  - Mike and Judit aligned the lab WFS for S1 (see [[/LABAO%20Alignment|alignment page]]). Due to mounting convenience, the labao WFS is conjugated to 120m upstream rather than the 145m upstream for the LDM.\\ \\  Plans for tomorrow\\  - Dichroic sine wave alignment testing (MJI)\\  - Go through list\\  - Reverse dichroics\\ \\  9 Dec 2015\\  - The pupil shift seen earlier in the week continues. Specifically... with a good M10 alignment and standard labao alignment, the beacon pupil is shifted on the labao WFS. When correct on LABAO, there was about a 10% error on M10. There are 3 possible reasons for this:\\
+- The two-hole mask test was difficult because there was only one two-hole mask! This is essential for all telescopes for the current procedure.\\  - No laptop or power supply available for the beacon focusing camera. This needs to live in a standard place and be part of the manual.\\  - Beacon focus was +1,500,000 counts out (i.e. way out by eye) and when it was in focus it looked perfect on the LABAO WFS... except that only half the pupil was illuminated.\\  - Discovered dust on the fiber tip and also vignetting probably due to no POP realignment done after the pupil shift.\\ \\  7 Dec 2015\\  - Theo and Judit again realigned the S2 labao from scratch. This time the beam was parallel to the optical table throughout.\\  - S1 and S2 beacons focused. Mike realised that the dichroic was installed backwards. The pupil shift seen (beacon with YSO dichroic versus M10 alignement) is consistent with this error.\\  - Mike and Judit aligned the lab WFS for S1 (see [[ao:LABAO_Alignment|alignment page]]). Due to mounting convenience, the labao WFS is conjugated to 120m upstream rather than the 145m upstream for the LDM.\\ \\  Plans for tomorrow\\  - Dichroic sine wave alignment testing (MJI)\\  - Go through list\\  - Reverse dichroics\\ \\  9 Dec 2015\\  - The pupil shift seen earlier in the week continues. Specifically... with a good M10 alignment and standard labao alignment, the beacon pupil is shifted on the labao WFS. When correct on LABAO, there was about a 10% error on M10. There are 3 possible reasons for this:\\
   - The beacon pupil at the telescope isn't aligned with the centre of the M5 mirror.

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