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40m Log |
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Wed Oct 12 22:51:26 2016, Koji, Update, General, Clipping could not be improved by the PZTs - NEED ANOTHER VENT
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Thu Oct 13 00:23:54 2016, ericq, Update, VAC, Pre-vent prep
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Thu Oct 13 09:30:38 2016, Steve, Update, General, vent 79 is happening 
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Thu Oct 13 16:48:34 2016, Steve, Update, VAC, vent 79 is completed
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Thu Oct 13 19:28:14 2016, gautam, Update, General, in-air alignment
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Fri Oct 14 10:31:53 2016, gautam, Update, General, doors are off ITMY and BS/PRM chambers
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Fri Oct 14 18:33:55 2016, gautam, Update, General, AS clipping investigations 7x
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Mon Oct 17 22:45:16 2016, gautam, Update, General, AS beam centered on all OMs 7x
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Tue Oct 18 18:56:57 2016, gautam, Update, General, OM5 rotated to bypass OMC, green scatter is from window to PSL table   
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Wed Oct 19 16:41:55 2016, gautam, Update, General, Heavy doors back on 8x
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Thu Oct 20 09:17:08 2016, Steve, Update, VAC, Pumpdown 80 has started   
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Thu Oct 20 15:59:52 2016, Steve, Update, VAC, Pumpdown 80 has completed  
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Fri Oct 21 02:06:20 2016, gautam, Update, General, IFO recovery
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Mon Oct 24 11:39:13 2016, gautam, Update, General, ALS recovered 
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Fri Oct 21 09:28:21 2016, Steve, Update, VAC, Vac Normal reached
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Wed Nov 23 11:32:13 2016, Steve, Update, VAC, TP3 drypump replaced again
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Fri Nov 10 08:52:21 2017, Steve, Update, VAC, TP3 drypump replaced
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Fri Feb 16 15:57:58 2018, Steve, Update, VAC, TP3 drypump replaced
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Thu Jul 12 16:18:22 2018, Steve, Update, VAC, Vent preparations 
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Thu Jul 12 23:59:14 2018, gautam, Update, General, Vent objectives and prep
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Fri Jul 13 02:52:11 2018, gautam, Update, General, Vent objectives and prep
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Fri Jul 13 17:13:45 2018, Koji, Update, General, Vent objectives and prep
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Fri Jul 13 18:01:13 2018, gautam, Update, General, Low power MC
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Message ID: 12560
Entry time: Thu Oct 13 19:28:14 2016
In reply to: 12559
Reply to this: 12561
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Author: |
gautam |
Type: |
Update |
Category: |
General |
Subject: |
in-air alignment |
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I did the following today to prepare for taking the doors off tomorrow.
- Locked MC at low power
- low power autolocker used during the last vent isn't working so well now
- so I manually locked the IMC - locks are holding for ~30 mins and MC transmission was maximized by tweaking MC1 and MC2 alignments. The transmission is now ~1150 which is what I remember it being from the last vent
- I had to restart c1aux to run LSCoffsets
- Aligned arms to green using bias sliders on IFO align
- X green transmission is ~0.4 and Y green transmission is ~0.5 which is what I remember it being before this vent
- Removed ND filters from end Transmon QPDs since there is so little light now
- Locked Y arm, ran the dither
- Some tip tilt beam walking was required before any flashes were seen
- I had to tweak the LSC gain for this to work
- TRY is ~0.3 - in the previous vent, in air low power locking yielded TRY of ~0.6 but the 50-50 BS that splits the light between the high gain PD and the QPD was removed back then so these numbers are consistent
- Tried locking X arm
- For some reason, I can't get the triggering to work well - the trigger in monitor channel (LSC-XARM_TRIG_IN) and LSC-TRX_OUT_DQ are not the same, should they not be?
- Tried using both QPD and high gain PD to lock, no luck. I also checked the error signal for DC offsets and that the demod phase was okay
- In any case, there are TRX flashes of ~0.3 as well, this plus the reasonable green transmission makes me think the X arm alignment is alright
- All the oplev spots are on their QPDs in the +/- 100 range. I didn't bother centering them for now
I am leaving all shutters closed overnight.
So I think we are ready to take the doors off at 8am tomorrow morning, unless anyone thinks there are any further checks to be done first.
Vent objectives:
- Fix AS beam clipping issues (elog1, elog2)
- Look into the green scatter situation (elog)
Should we look to do anything else now? One thing that comes to mind is should we install ITM baffles? Or would this be more invasive than necessary for this vent?
Steve reported to me that he was unable to ssh into the control room machines from the laptops at the Xend and near the vacuum rack. The problem was with pianosa being frozen up. I did a manual reboot of pianosa and was able to ssh into it from both laptops just now. |