40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
40m Log |
Not logged in |
 |
|
Wed Jul 27 15:03:02 2016, sisyphus, Metaphysics, SUS, Broken wire
|
Wed Jul 27 16:56:47 2016, rana, Metaphysics, SUS, Broken wire
|
Thu Jul 28 08:42:36 2016, Steve, Update, SUS, wire clamp
|
Fri Jul 29 15:17:23 2016, Steve, Update, SUS, wire and clamping test
|
Fri Jul 29 20:12:54 2016, gautam, Update, SUS, third time - no luck
|
Mon Aug 1 14:09:20 2016, Steve, Update, SUS, third time - no luck
|
Tue Aug 9 16:19:27 2016, Steve, Update, SUS, torque driver for wire clamp
|
Wed Aug 10 15:34:24 2016, Steve, Update, SUS, 6 in-lbs torque driver for wire clamp screw
|
Wed Aug 3 00:15:39 2016, gautam, Update, SUS, ETMX suspended
|
Wed Aug 3 09:26:54 2016, Lydia, Update, SUS, ETMX suspended: photos 8x
|
Thu Aug 4 03:14:39 2016, gautam, Update, SUS, ETMX suspended
|
Fri Aug 5 02:17:10 2016, gautam, Update, SUS, ETMX Ruby Wire Standoff Ready for Gluing 8x
|
Fri Aug 5 04:43:09 2016, Koji, Update, SUS, ETMX Ruby Wire Standoff Ready for Gluing
|
Fri Aug 5 18:21:28 2016, gautam, Update, SUS, ETMX Ruby Wire Standoff GLUED 11x
|
Sun Aug 7 14:53:39 2016, ericq , Update, SUS, ETMX Standoff gluing was successful 
|
Tue Aug 9 00:44:43 2016, gautam , Update, SUS, ETMY patch-up
|
Tue Aug 9 15:27:57 2016, gautam , Update, SUS, ETMY patch-up 
|
Wed Aug 10 03:08:03 2016, gautam , Update, SUS, ETMY patch-up
|
Wed Aug 10 23:45:03 2016, gautam , Update, SUS, ETMY re-suspended 7x
|
Thu Aug 11 00:20:41 2016, Koji, Update, SUS, ETMY re-suspended
|
Thu Aug 11 11:56:40 2016, gautam, Update, SUS, ETMY re-suspended
|
Mon Aug 15 18:28:15 2016, gautam, Update, SUS, Air-bake preparation
|
Tue Aug 16 08:04:49 2016, Steve, Update, SUS, ETMY had Aluminum bridge
|
Tue Aug 16 21:54:27 2016, gautam, Update, SUS, Air-bake - IN PROGRESS
|
Wed Aug 17 08:47:43 2016, ericq, Update, SUS, Air-bake finished
|
Wed Aug 17 23:00:57 2016, gautam, Update, SUS, Air-bake of towers
|
Thu Aug 18 08:17:16 2016, Steve, Update, SUS, wire clamping preparation
|
Thu Aug 18 14:14:20 2016, gautam, Update, SUS, Air-bake of towers - finished
|
Fri Aug 19 22:51:12 2016, gautam, Update, SUS, ETMs first-contacted
|
Sun Aug 21 16:23:05 2016, gautam, Update, SUS, ETMX suspended
|
Mon Aug 22 13:06:11 2016, gautam, Update, SUS, ETMY suspended
|
Mon Aug 22 18:04:24 2016, gautam, Update, SUS, ETMY OSEMs inserted
|
Tue Aug 23 19:35:38 2016, gautam, Update, SUS, ETMY back in IFO 10x
|
Thu Aug 25 21:11:43 2016, gautam, Update, SUS, ETMY back in IFO
|
Fri Aug 26 11:35:44 2016, gautam, Update, SUS, ETMY UL sensor problematic  
|
Fri Aug 26 14:05:38 2016, Steve, Update, SUS, ETMY UL sensor problematic
|
Fri Aug 26 14:09:46 2016, ericq, Update, SUS, ETMY UL sensor problematic
|
Sun Aug 28 21:40:11 2016, gautam, Update, SUS, ETMY UL sensor problematic
|
Mon Aug 29 09:37:05 2016, gautam, Update, SUS, ETMY UL sensor problematic
|
Mon Aug 29 14:42:06 2016, gautam, Update, SUS, ETMY Satellite box diagnostics 
|
Fri Aug 26 17:48:14 2016, gautam, Update, SUS, bounce mode coupling reduction
|
Mon Aug 29 21:53:14 2016, Lydia, Update, SUS, ETMY bounce mode coupling 
|
Tue Aug 30 20:26:36 2016, gautam, Update, SUS, ITMY installed  
|
Wed Aug 31 18:07:43 2016, Johannes, Update, SUS, ITMY free swinging
|
Wed Aug 31 22:09:18 2016, gautam, Update, SUS, Y arm locked to Green
|
Thu Sep 1 08:30:24 2016, Steve, Update, SUS, ITMY_UL is sick 
|
Tue Sep 6 20:30:56 2016, rana, Update, SUS, ITMY_UL is sick
|
Tue Sep 13 11:00:59 2016, Lydia, Update, SUS, ETMY UL glitch returned
|
Thu Sep 1 19:59:22 2016, Johannes, Update, SUS, IR mode flashes in Y arm
|
Fri Sep 2 21:09:08 2016, gautam, Update, SUS, Y arm locked in air 
|
Tue Sep 6 20:45:14 2016, gautam, Update, SUS, X arm test masses back in chamber   
|
Thu Sep 8 22:12:36 2016, gautam, Update, SUS, X arm in place, locked to green, IR flashes visible
|
Fri Sep 9 17:50:02 2016, gautam, Update, SUS, Heavy doors on BS-PRM, ETMY chambers
|
Sat Sep 10 14:26:01 2016, rana, Update, General, PRM SRM alignment
|
Mon Sep 12 17:15:22 2016, Johannes, Update, General, PRM SRM alignment 
|
Thu Sep 1 19:18:14 2016, Johannes, Update, SUS, ITMX and ETMX preemptive table leveling 8x
|
Fri Sep 2 21:15:53 2016, gautam, Update, SUS, ITMX and ETMX preemptive table leveling
|
Thu Sep 1 15:43:16 2016, rana, Update, SUS, OSEM adjustments
|
Mon Sep 5 19:57:24 2016, Osamu, Update, SUS, OSEM adjustments
|
|
Message ID: 12430
Entry time: Mon Aug 22 18:04:24 2016
In reply to: 12428
Reply to this: 12434
|
Author: |
gautam |
Type: |
Update |
Category: |
SUS |
Subject: |
ETMY OSEMs inserted |
|
|
[Johannes, gautam]
We worked on trying to insert the OSEMs in the optimal positions such that the coupling of the bounce mode into the OSEM sensor signals was minimised.
First, I gave the barrel of the optic a wipe with some optical tissue + acetone in order to remove what looked like some thin fibres of dried first contact. It may be that while I was applying the F.C., the HEPA air flow deposited these on the barrel. In any case, they came off easily enough. There is still a few specks of dust on various parts of the barrel, but it is likely that these can just be removed with the ionized air jet, which we can do after putting the optic in the chamber.
We then did the usual OSEM insertion till the magnets neutral position was such that the sensor output was ~50% of the fully open value (turned the HEPA off for the remainder of this work). I tweaked the bottom OSEM plate a little in order to center the magnets relative to the coil as best as possible. Once this was done, we attempted to look at spectra of the sensor outputs, with 0.05 Hz bandwidth - however, we were unable to identify any peak at 16.4 Hz, which is what a Jan 2015 measured value wiki page claims the bounce mode frequency is (although this was an in vacuum measurement). There were a couple of peaks at ~15.7 Hz and ~16.7 Hz, but I can't think of any reason why the bounce mode resonance should have changed so much - after all, this is ETMY for which no standoff regluing was done. The only difference is that there is some first contact + peek mesh on the HR face now, but I doubt this can modify the bounce resonance frequency so much (this is just my guess, I will have to back this up with a calculation).
Anyways we decided to take this up again tomorrow. Things are progressing fairly well now, I hope to be able to put in ETMY back into the chamber at some point tomorrow and commence re-alignment of the interferometer. I've left the OSEMs in for today, with the EQ stops not engaged but close by. HEPA has been turned back on. |