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40m Log |
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Wed Jul 27 15:03:02 2016, sisyphus, Metaphysics, SUS, Broken wire
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Wed Jul 27 16:56:47 2016, rana, Metaphysics, SUS, Broken wire
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Thu Jul 28 08:42:36 2016, Steve, Update, SUS, wire clamp
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Fri Jul 29 15:17:23 2016, Steve, Update, SUS, wire and clamping test
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Fri Jul 29 20:12:54 2016, gautam, Update, SUS, third time - no luck
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Mon Aug 1 14:09:20 2016, Steve, Update, SUS, third time - no luck
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Tue Aug 9 16:19:27 2016, Steve, Update, SUS, torque driver for wire clamp
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Wed Aug 10 15:34:24 2016, Steve, Update, SUS, 6 in-lbs torque driver for wire clamp screw
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Wed Aug 3 00:15:39 2016, gautam, Update, SUS, ETMX suspended
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Wed Aug 3 09:26:54 2016, Lydia, Update, SUS, ETMX suspended: photos 8x
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Thu Aug 4 03:14:39 2016, gautam, Update, SUS, ETMX suspended
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Fri Aug 5 02:17:10 2016, gautam, Update, SUS, ETMX Ruby Wire Standoff Ready for Gluing 8x
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Fri Aug 5 04:43:09 2016, Koji, Update, SUS, ETMX Ruby Wire Standoff Ready for Gluing
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Fri Aug 5 18:21:28 2016, gautam, Update, SUS, ETMX Ruby Wire Standoff GLUED 11x
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Sun Aug 7 14:53:39 2016, ericq , Update, SUS, ETMX Standoff gluing was successful 
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Tue Aug 9 00:44:43 2016, gautam , Update, SUS, ETMY patch-up
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Tue Aug 9 15:27:57 2016, gautam , Update, SUS, ETMY patch-up 
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Wed Aug 10 03:08:03 2016, gautam , Update, SUS, ETMY patch-up
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Wed Aug 10 23:45:03 2016, gautam , Update, SUS, ETMY re-suspended 7x
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Thu Aug 11 00:20:41 2016, Koji, Update, SUS, ETMY re-suspended
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Thu Aug 11 11:56:40 2016, gautam, Update, SUS, ETMY re-suspended
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Mon Aug 15 18:28:15 2016, gautam, Update, SUS, Air-bake preparation
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Tue Aug 16 08:04:49 2016, Steve, Update, SUS, ETMY had Aluminum bridge
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Tue Aug 16 21:54:27 2016, gautam, Update, SUS, Air-bake - IN PROGRESS
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Wed Aug 17 08:47:43 2016, ericq, Update, SUS, Air-bake finished
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Wed Aug 17 23:00:57 2016, gautam, Update, SUS, Air-bake of towers
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Thu Aug 18 08:17:16 2016, Steve, Update, SUS, wire clamping preparation
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Thu Aug 18 14:14:20 2016, gautam, Update, SUS, Air-bake of towers - finished
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Fri Aug 19 22:51:12 2016, gautam, Update, SUS, ETMs first-contacted
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Sun Aug 21 16:23:05 2016, gautam, Update, SUS, ETMX suspended
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Mon Aug 22 13:06:11 2016, gautam, Update, SUS, ETMY suspended
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Mon Aug 22 18:04:24 2016, gautam, Update, SUS, ETMY OSEMs inserted
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Tue Aug 23 19:35:38 2016, gautam, Update, SUS, ETMY back in IFO 10x
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Thu Aug 25 21:11:43 2016, gautam, Update, SUS, ETMY back in IFO
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Fri Aug 26 11:35:44 2016, gautam, Update, SUS, ETMY UL sensor problematic  
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Fri Aug 26 14:05:38 2016, Steve, Update, SUS, ETMY UL sensor problematic
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Fri Aug 26 14:09:46 2016, ericq, Update, SUS, ETMY UL sensor problematic
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Sun Aug 28 21:40:11 2016, gautam, Update, SUS, ETMY UL sensor problematic
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Mon Aug 29 09:37:05 2016, gautam, Update, SUS, ETMY UL sensor problematic
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Mon Aug 29 14:42:06 2016, gautam, Update, SUS, ETMY Satellite box diagnostics 
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Fri Aug 26 17:48:14 2016, gautam, Update, SUS, bounce mode coupling reduction
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Mon Aug 29 21:53:14 2016, Lydia, Update, SUS, ETMY bounce mode coupling 
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Tue Aug 30 20:26:36 2016, gautam, Update, SUS, ITMY installed  
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Wed Aug 31 18:07:43 2016, Johannes, Update, SUS, ITMY free swinging
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Wed Aug 31 22:09:18 2016, gautam, Update, SUS, Y arm locked to Green
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Thu Sep 1 08:30:24 2016, Steve, Update, SUS, ITMY_UL is sick 
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Tue Sep 6 20:30:56 2016, rana, Update, SUS, ITMY_UL is sick
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Tue Sep 13 11:00:59 2016, Lydia, Update, SUS, ETMY UL glitch returned
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Thu Sep 1 19:59:22 2016, Johannes, Update, SUS, IR mode flashes in Y arm
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Fri Sep 2 21:09:08 2016, gautam, Update, SUS, Y arm locked in air 
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Tue Sep 6 20:45:14 2016, gautam, Update, SUS, X arm test masses back in chamber   
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Thu Sep 8 22:12:36 2016, gautam, Update, SUS, X arm in place, locked to green, IR flashes visible
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Fri Sep 9 17:50:02 2016, gautam, Update, SUS, Heavy doors on BS-PRM, ETMY chambers
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Sat Sep 10 14:26:01 2016, rana, Update, General, PRM SRM alignment
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Mon Sep 12 17:15:22 2016, Johannes, Update, General, PRM SRM alignment 
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Thu Sep 1 19:18:14 2016, Johannes, Update, SUS, ITMX and ETMX preemptive table leveling 8x
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Fri Sep 2 21:15:53 2016, gautam, Update, SUS, ITMX and ETMX preemptive table leveling
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Thu Sep 1 15:43:16 2016, rana, Update, SUS, OSEM adjustments
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Mon Sep 5 19:57:24 2016, Osamu, Update, SUS, OSEM adjustments
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Message ID: 12384
Entry time: Tue Aug 9 00:44:43 2016
In reply to: 12382
Reply to this: 12386
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Author: |
gautam |
Type: |
Update |
Category: |
SUS |
Subject: |
ETMY patch-up |
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Summary:
Given that ETMX looks to be in good shape and the optic and suspension tower are ready for vacuum and air bakes respectively, I set about re-gluing the knocked off magnet of ETMY. In my previous elog, I had identified the knocked off magnet as the UL magnet. But in fact, it was the LR magnet that broke off. This is actually one of the magnets that was knocked off when Johannes was removing the optic from the vacuum chamber. I have edited the old elog accordingly.
Step 1: Removing epoxy residue
- I used the teflon+glass rig Steve put together for this purpose
- After soaking for ~2 hours in acetone, I was able to remove approximately half of the ring residue by lightly pushing with a wipe.
- The other half wouldn't budge so I let it soak for another 4 hours
- After 6 hours of soaking, I was able to get all of the epoxy residue off - it doesn't simply dissolve in the acetone, I had to push a little with one of the cotton-tipped paddles in the cleanroom
- I gave the portion exposed to acetone a quick drag wipe with isopropanol. I didn't spend too much time trying to clean the AR side given that we will be using first contact anyways.
- I have not touched the HR side for now, even though a small portion of it was exposed to acetone. While cleaning the HR face with first contact, this portion can be inspected and cleaned if necessary
Step 2: Putting the optic in the magnet gluing jig
- I transferred the optic to the magnet gluing jig
- Given that we weren't touching any side magnets, I reasoned I did not have to go through the elaborate shimming routine to account for the wedge of the optic that we had to do in the recent past
- However, I did not think to put a thicker teflon spacer on the lower side of the wedge, and as a result, I knocked off the UR magnet as well as the jig did not have sufficient clearance
- Fortunately, the UR magnet came off cleanly, there was hardly any epoxy residue left on the optic. The UR magnet was NOT one of the magnets knocked off by Johannes while removing the optic from the vacuum chamber
- I gave the area formerly occupied by the UL magnet 3-4 wipes with acetone and then 1-2 wipes with isopropanol
- At this stage, I proceeded to re-insert the magnet-gluing jig. I used the two scribe lines on the outer side of the jig to fix the rotation of the jig, and used the remaining two attached face magnets to fix the overall position of the jig (by centering these magnets relative to the apertures on the jig). In order to center well, I had to unscrew the stuck silver plated screw on the jig by 1 turn
- Having arranged the jig satisfactorily, I proceeded to remove epoxy residue off the dumbbell of the recently knocked off UL magnet using first a razor blade, then sandpaper and finally made some new grooves with a razor blade. I then cleaned the surface of the dumbbell to be in contact with the optic with isopropanol. All of this was done for the LR magnet two weeks ago right after it was knocked off
Step 3: Gluing the magnets
- I prepared the magnets in the pickle pickers
- I discarded 1 full squeeze of the epoxy after it reached the tip of the mixing fixture, and then extracted another full squeeze of the gun for mixing and gluing the magnets
- I mixed the epoxy in an Al foil vessel for 3-4 minutes, and then placed a few drops on a piece of Al foil for a test bake at 200F for ~15 minutes
- The test bake went well, so I proceeded to apply glue to the dumbbells and re-glue the magnets to the optic
- The gluing was done around midnight, so we should be able to have a look at this post lunch tomorrow.
Provided the gluing goes well, the plan for tomorrow is:
- Bring ETMY suspension tower from the vacuum chamber to the cleanroom along with its OSEMs
- Suspend ETMY with a new length of wire (this should be much more straightforward than our ETMX exploits as both standoffs are already glued)
- Insert OSEMs, check that all 4 face magnets are well centered w.r.t. their coils and also that at least one side magnet is well aligned relative to its coil and can be used
- If step 3 goes well, then ETMY is also ready for a vacuum bake. I guess we can also air bake the ETMY suspension tower, there's plenty of room in the oven
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