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40m Log |
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Tue Jan 15 10:52:38 2019, gautam, Update, SUS, EY door opened
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Tue Jan 15 15:49:47 2019, gautam, Update, SUS, EY door opened
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Sat Jan 19 15:33:18 2019, gautam, Update, SUS, ETMY OSEMs faulty 
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Tue Jan 22 20:36:53 2019, gautam, Update, SUS, ETMY OSEMs faulty
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Wed Jan 23 12:39:18 2019, gautam, Update, SUS, EY chamber work 6x
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Wed Jan 23 23:12:44 2019, gautam, Update, SUS, Prep for FC cleaning
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Thu Jan 24 15:32:31 2019, gautam, Update, SUS, Y arm cavity side first contact applied 
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Tue Jan 29 22:12:40 2019, gautam, Update, SUS, Alignment prep
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Wed Jan 30 11:54:24 2019, gautam, Update, SUS, More alignment prep 
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Wed Jan 30 19:25:40 2019, gautam, Update, SUS, Xarm cavity alignment 
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Fri Feb 1 01:24:06 2019, gautam, Update, SUS, Almost ready for pumpdown tomorrow
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Fri Feb 1 13:16:50 2019, gautam, Update, SUS, Pumpdown 83 underway
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Fri Feb 1 21:52:57 2019, gautam, Update, SUS, Pumpdown 83 underway
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Fri Feb 1 14:44:14 2019, gautam, Update, SUS, Y arm FC cleaning and reinstall  
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Wed Jan 16 16:25:25 2019, gautam, Update, SUS, Yarm locked
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Fri Jan 18 21:34:18 2019, gautam, Update, SUS, Unused optic on EY table
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Sat Jan 19 05:07:45 2019, Koji, Update, SUS, Unused optic on EY table
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Message ID: 14423
Entry time: Wed Jan 30 11:54:24 2019
In reply to: 14422
Reply to this: 14424
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Author: |
gautam |
Type: |
Update |
Category: |
SUS |
Subject: |
More alignment prep |
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[chub, gautam]
- ETMY cage was wiped down
- Targeted potential areas where dust could drift off from and get attracted to a charged HR surface
- These areas were surprisingly dusty, even left a grey mark on the wipe [Attachment #1] - we think we did a sufficiently thorough job, but unclear if this helps the loss numbers
- More pictures are on gPhoto
- Filters on SD and LR OSEMs were replaced - the open shadow sensor voltages with filters in/out are consistent with the T>95% coating spec.
- IPANG beam position was checked
- It is already too high, missing the first steering optic by ~0.5 inch, not the greatest photo but conclusion holds [Attachment #2].
- I think we shouldn't worry about it for this pumpdown, we can fix it when we put in the new PR3.
- Cage wiping procedure was repeated on ITMY
- The cage was much dustier than ETMY
- However, the optic itself (barrel and edge of HR face) was cleaner
- All accessible areas were wiped with isopropanol
- Before/after pics are on gPhoto (even after cleaning, there are some marks on the suspension that looks like dust, but these are machining marks)
Procedure tomorrow [comments / suggestions welcome]:
- Start with IY chamber
- Peel first contact with TopGun jet flowing
- Inspect optic face with green flashlight to check for residual First Contact
- Replace ITMY suspension cage in its position, clamp it down
- Release ITMY from its EQ stops
- Replace OSEMs in ITMY cage, best effort to recover previous alignment of OSEMs in their holders (I have a photo before removal of OSEMs), which supposedly minimized the coupling of the B-R modes into the shadow sensor signals
- Best effort to have shadow sensor PD outputs at half their fully open voltages (with DC bias voltage applied)
- Quick check that we are hitting the center of the ITM with the alignment tool
- Check that the Oplev HeNe is reasonably centered on steering mirrors
- Tie down OSEM cabling to the ITMY cage with clean copper wire
- Replace the OSEM wiring tower
- Release the SRM from its EQ stops
- Check table leveling
- Take pictures of everything, check that we have not left any tools inside the chamber
- Heavy doors on
- Next, EY chamber
- Repeat first seven bullets from the IY chamber, :%s/ITMY/ETMY/g
- Confirm sufficient clearance between IFO beam axis and the elliptical reflector
- Check Oplev beam path
- Check table leveling
- Take pictures of everything, check that we have not left any tools inside the chamber
- Heavy doors on
- IFO alignment checks - basically follow the wiki, we want to be able to lock both arms (or at least see TEM00 resonances), and see that the PRC and SRC mode flashes look reasonable.
- Tighten all heavy doors up
- Pump down
All photos have been uploaded to google photos. |
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