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Wed May 22 22:50:13 2019, gautam, Update, VAC, Pumpdown prep
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Thu May 23 15:30:56 2019, gautam, Update, VAC, Pumpdown underway - so far so good!
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Fri May 24 11:47:15 2019, gautam, Update, VAC, IFO is almost at nominal vacuum
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Mon May 27 11:37:13 2019, gautam, Update, VAC, c1vac is unresponsive
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Tue May 28 09:51:33 2019, gautam, Update, VAC, c1vac hard-rebooted
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Message ID: 14631
Entry time: Wed May 22 22:50:13 2019
Reply to this: 14634
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Author: |
gautam |
Type: |
Update |
Category: |
VAC |
Subject: |
Pumpdown prep |
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I did the following:
- Checked the ETMY OSEM sensing matrix and OSEM actuation matrix - more on this later, but everything seems much more reasonable than it was prior to this vent.
- Checked that the IMC could be locked with the low-power beam
- Aligned the Y-arm cavity using the green beam. Then tweaked the TT1/TT2 alignment until I saw IR flashes in TRY.
- Repeated #2 for the X arm, using the BS to control the beam pointing.
- Confirmed that the AS beam makes it out of the vacuum. It is only ~30uW in a large (~1cm dia) beam, so not the clearest spot on an IR card, but looks pretty clean, no evidence of clipping. I removed an ND filter on the AS port camera in order to better see the beam on the CRT monitor, this should be re-installed prior to ramping the input power to the IMC again.
- With the PRM aligned, I confirmed that I could see resonant flashes in the POP QPD.
- With the SRM aligned, I confirmed that I could see SRC cavity flashes on the AS camera.
I think this completes the pre-pumpdown alignment checks we usually do. The detailed plan for tomorrow is here: please have a look and lmk if I missed something. |