Two fibers welded today. Two more to do tomorrow. I'll leave it at that.
I have cleaned up the ISC guardian code (ISC_LOCK, ISC_DRMI, OMC_LOCK, ALIGN_IFO, ALS_XARM, ALS_YARM, ALS_COMM, ALS_DIFF, ISC_GEN_STATES, ISC_library and lscparams).
My goals were to remove depricated code (it's been growing since ~2014, and many functions clearly haven't been used since about then), merge nearly-identical functions (we don't need 15 different functions to determine if a cavity is locked), ensure that functions from sub-files (eg. ISC_library) are clearly called out (by removing all "from _______ import *", which Sheila had already done a lot of work toward), and make the code generally easier to read.
I was going to do a bit more syntax checking, but since we have IR light into the vacuum earlier than had been anticipated and several people have been working on locking the IMC, I deployed the new code this afternoon. All guardians were checked in before I did anything, and then I copied over my files from a side folder into the main userapps guardian folders.
So far, the IMC guardian is able to lock the IMC (after a few boost changes from Sheila, TVo, DanielBrown and Alexei...they'll write a separate alog). The ALIGN_IFO guardian is able to change the SUS configurations, although it hasn't been tested farther than that, since PeterK is working on the PSL.
This cleanup has removed ~4,000 lines of unnecessary guardian user code. I think it'll help make things easier as we go forward with a new commissioning phase.
Jeff Kissel loves this.
Sebastien, Betsy, and Slawek We installed AMD 1 and 2 on ETMy today. It went very well, no issue to report. We applied the required force on each AMD (~250 g). The bond looks homogeneous with tiny excess epoxy ring around the AMD base, as expected. Curing will take 24 hours. We did the dynamic test of the epoxy before installation and it was successful. Installation of AMD 3 and 4 is scheduled for Thursday morning (3/29).
Below are pictures of the first AMD and it's tooling installed on the left flat of ETMY (Left as viewed from the standard sus back).
And below are the first AMD and tooling installed on the Right flat of the ETMY also installed today.
Each flat gets one more, scheduled for a Thur install with Slawek and Seb.
I changed the Power Conditioning Board D1001474 but to no avail. Rerouted cables to ease strain, added an extension to the sync cable but none was decisive. Filiberto suggested we take the cable backshells apart and look there; did not do this with the power cable. We did not really see anything but Fil did play with the shield to shell connection (I think) but still nothing really made things great.
Do have the rack currently top side up so that is a start. But, when I put the table up on the cable tray (again, changing the cable strains) things went noisy again. TJ was now in chamber limiting our access and muddying the waters with his platform noise. Left the CPS crate table on the ground and it now looks pretty good. Again though, this seems too dainty. Will continue troubleshooting.
This morning Corey, Niko and I went to EX and installed most of the remaining PCAL baffle pieces. We looked over the panels, top-gunned them, then I went inside and Corey and Niko handed the pieces to me from the door. After putting the pieces on, I tried to get a couple of picture of the install and any particulate. First attached image is a view of the installed panels from approximately the the aperture of the arm cavity baffle.
The barrel baffle pieces were installed a couple weeks ago, and the lower panel has been accumulating particulate, second image. I was pretty easily able to wipe away the fuzzies with a dry wipe, but the barrel panel immediately started accumulating again (third image is the lower panel piece after wiping). Before I left, I did not notice any increased particulate on the front baffle pieces we installed today. Travis noted before we closed ETMY (the first time?) that the panels on that PCAL had also accumulated some particulate, so it seems we will have to consider adding a wipe down step for the baffles to chamber close out.
Black nickel barrel baffle panels + dry wiping is likely to contribute static charging, which may accelerate the rate at which particulate makes its way onto these panels - we should revisit this in discussion with SYS, perhaps via the "Updated procedures for handling the coated baffles" email thread.
Jim doing the limbo under the EX Arm Cavity Baffle (ACB).
These pictures show that the PCAL "camera mirrors" were removed by this stage. I believe they were pulled after first alignment check, when we started removing screw in preparation for bracket install.
Stephen A., Chandra R.
This morning Stephen helped/instructed me on assembly of the first LHO chevron baffle. Baffle SN 001 was installed in nipple housing SN 001. We iterated several times on bending the louvers to securely set them in place and ended with an N2 "top gun" blow off before bolting the two baffle halves together and fastening to the nipple housing. The eight bolts that secure the baffle to the housing still need to be torqued. We placed the two 16.5" Cu gaskets on knife edges and wrapped with Al foil for temporary storage in VPW until we can install on IP11 at EY later this week. Stephen will post pictures later.
Refer to LLO aLOG for more detail on steps of installation. https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=38375
Assembly procedure is E1800067 (still needs updates based on lessons learned in assembly work at LLO and LHO). One key feature of this assembly effort - we only had 2 people, so we took the following approach to placing the D1600409 louver cell within the D1600410 nipple:
This assembly that we built is on ICS as ASSY-D1600431-001
I have attached photos of various stages - see below descriptions:
Morning subbing for Niko while he does some PCal work:
14:40 Jeff B ou to LVE to remove house vacuum system
14:53 M2 installing platform at HAM6
15:47 Norco on site with LN2 delivery - xxxxx75
15:50 Marc out to LVEA - PSL & HAM6 rack area
15:55 Richard ou to LVEA
15:45 Peter and Carlos out to PSL to replace a computer in the enclosure
15:56 Hugh out to HAM6
16:00 Travis out to EX
16:21 Richard out to LVEA
16:27 Richard out
16:38 Karen to EY ad then MY
16:45 Cintas on site
16:47 Nutsinee out to Squeezer table to retrieve serial number
16:50 Peter and Carlos out
16:52 N back
16:53 Betsy, Slawek and Sebastian out to EY
17:13 Carlos out to LVEA - PSL area
17:15 Terry out to Squezer table
17:21 Terry back
17:22 Betsy back and out to EX.
17:23 LVEA is LASER HAZARD
17:27 Paradise Water on site
17:30 TJ out to HAM6 to work with Hugh
17:37 Carlos out
17:49 Karen leaving EY for CS
18:04 Fil back
18:09 Hugh back
18:10 Niko back
Filling in the beginning/end of the day:
TITLE: 03/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
LOG:
14:40 (7:40) Bartlett in LVEA -- remove house vacuum system
14:53 (7:53) M&M to HAM6 -- installing platform on southside
15:00 (8:00) Start of shift
15:35 (8:35) Chris to mid and end stations
16:00 (9:00) Shift covered by Ed
18:10 (11:10) Back in the control room
18:19 (11:19) Bartlett out of LVEA
18:28 (11:28) Chandra to MY
18:59 (11:59) H1 hardware injection upgrade starting
19:20 (12:20) Travis, Betsy, Stephen, Angus, Jason back from EX for lunch
19:56 (12:56) TJ out of LVEA
20:10 (13:10) Sheila, TVo, Daniel, Alexei to LVEA -- adjust mode cleaner optics
20:12 (13:12) Ed to HAM6 -- hooking up wires
20:15 (13:15) Marc to EX, EY -- work on RF cabling
20:20 (13:20) Slawek, Sesbatian, Betsy to EY
20:21 (13:21) Sheila, TVo, Daniel, Alexei out of LVEA
20:39 (13:39) Jason Stephen Angus Travis to EX -- fiber welding
21:14 (14:14) Peter to PSL enclosure
21:33 (14:33) Marc back from end stations
21:42 (14:42) Terry to ISCT6
22:43 (15:43) Chandra to MY
22:53 (15:53) Peter out of PSL
23:00 (16:00) End of shift
70W installation - ongoing
A very rusty (nearly all the way through) sprinkler pipe was discovered in the LSB interstitial yesterday. The pipe had a very minor leak where the down leg screws into the 90 degree ell and finally formed enough rust and calcium deposits that started deteriorating the pipe from the outside in. I have isolated the system and will replace the pipe. I have also filed an FRS and will also input this into the FAMIS system for quarterly checks of the entire system. Until the pipe is replaced, hopefully today, the LSB will be without automated fire protection, all pull stations will still alert the fire department.
In trying to improve the mode matching into the pre-modecleaner, the alignment through the mode matching
lenses was redone because of a mechanical interference issue with already installed mounts. With the
lenses in their calculated positions, the beam was still too big for the pre-modecleaner and the visibility
was ~40%. More beam propagation measurements were taken to check the results from the previous week.
Re-doing the fit and allowing large variations in the amplifier output waist and location, resulted in new
positions for the lenses. That improved the pre-modecleaner visibility to ~75%.
At the moment, both the pre-modecleaner and reference cavity are locked but are by no means tweaked up.
I had hoped to be at this stage with less than 10 hours on the amplifier's clock but the alignment and
beam size checks took longer than expected.
Volker Quetschke / Peter
Kyle, Chandra
I think we set a new record for valve replacement. Replaced 10" valve today at X-beam manifold turbo station. Will leak check turbo side tomorrow and beam tube side after IP6 valve is replaced and XBM pumped back down later this week.
We had to cut away some of the vinyl floor around the turbo station framing in order to slide it around on concrete.
Angus (GLA) and Stephen (CIT) arrived this week to help with a few projects. This morning, Angus, Travis and I pulled the FC on the ETMX AR which we applied last Fri, and then used the ergo arm to install it into the lower structure. Stephen helped Jason set up the IAS equipment and then we spent the afternoon setting the structure, UIM, PUM, and test mass level and pointing nominally wrt each other.
Angus and Travis canned fibers in the pulling lab and brought them to EX.
We anticipate starting the fiber welding tomorrow.
TITLE: 03/26 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
LOG:
14:00 (7:00) Peter to PSL Enclosure
14:10 (7:10) Karen to EY
14:28 (7:28) Marc, Mark, and Tyler to EY -- moving cleanroom
14:36 (7:36) Vanessa to EX
15:00 (8:00) Start of shift
15:08 (8:08) Terry to ISCT6 -- taking picture
16:35 (9:35) Mark, Mark, and Tyler to EX to grab tools, then EY to remove BSC door
16:37 (9:37) Volker to PSL enclosure
16:39 (9:39) Karen to EY
16:52 (9:52) Karen to MY
16:52 (9:52) Travis, Betsy to EX
16:54 (9:54) Chris, Jason to EX -- delivering fiber welding equipment
17:00 (10:00) Hugh to HAM6 -- CPS AND pull through
17:03 (10:03) Bartlett to Optics Lab -- reset dust monitors and update comptroller
17:17 (10:17) Richard to PSL enclosure -- dropping off equipment
17:36 (10:36) Chandra to LVEA -- work XBL manifold turbo
17:46 (10:46) Jim to EX, EY -- grab stool at EX, bring to EY
17:59 (10:59) Bartlett to LVEA -- take out in-house vacuum system
18:01 (11:01) Stephen, Jason to EX -- fiber welding work
18:09 (11:09) Corey to LVEA -- mark table panels for drilling
18:11 (11:11) Karen leaving MY
18:16 (11:16) Jim back from End stations
18:29 (11:29) Fil and Dave to CER -- examine PSL rack
18:32 (11:32) Marc to PSL enclosure, inspect chassis
18:37 (11:37) TVo, guests out from LVEA
18:38 (11:38) Peter, Volker out from PSL enclosure
18:44 (11:44) Marc out of PSL enclosure
18:47 (11:47) Dave back from CER
18:47 (11:47) Fil to LVEA
18:48 (11:48) Corey back from LVEA
19:16 (12:16) Bartlett out of LVEA
19:19 (12:19) Hugh out of LVEA
19:36 (12:36) Hanford notification, monthly siren tests occuring now until around 2:30
19:45 (12:45) Jim to EY
20:09 (13:09) Peter and Volker to PSL enclosure
20:16 (13:16) Kyle to LVEA
20:54 (13:54) Hugh to HAM6 -- work on CPS noise
21:23 (14:23) Travis, Betsy, Stephen, Angus, Jason to EX
21:33 (14:33) Mark to LVEA -- measurement at HAM6
21:50 (14:50) Mark out of LVEA
22:16 (15:16) Hugh out of LVEA
23:00 (16:00) End of shift
See the attached...Why is the spectra below 5 & 8 hz elevated for Corner3 H & V on the CPS? V3 is a new CPS but it has been on the shelf for years now and while it has the copper braid in place, that braid is not zip tied at the sensor end (shouldn't impact things); both are attached to a feedthru that has recently been removed and replaced several times and the feedthru is currently not torqued down (should not impact the grounding); the Satellite box was moved around and its ground lug to the house ground was exercised as the ground cable had come loose... Need a little more attention here:
We'll try, 1) confirm ground is good on the rack put it back where it should be located under the Chamber, 2) Torque down the feedthru--like to do this after things look good but maybe it is to blame (I doubt it.)
Okay, managed to get a good signal from the Corner3 CPS on HAM6 but can't say I'm ready to put this to bed. See attached for the latest Spectra. The final solution was to have the Satellite crate on its side rather than the normal top side up.
I swapped one then both In-Air cables, disconnected grounds at the Satellite crate--had to put the crate on its side to do this (the screws are facing down) and this is when I got a good signal. Repeated this orientation thing I don't know how many times putting all the cables back, reconnecting the grounds, putting the feed-thru protector back on flopping the crate each time. No matter whether grounded, new cables, etc, the only way to get a steady spectra was to keep the crate on its side--hmmm I did not try both sides....
The crate orientation dependence suggests the cables connected are problematic or something in the crate itself is gravity sensitive. I could get no obvious issue to pop up as I manipulated the cables but maybe I did not manipulate enough. I'll bring in EE to see if they have any help for us.
Meanwhile, before tackling all this, I did all the things needed in-chamber first: 1) Got the zip-tie snug enough at the V3 sensor end: by unmounting the sensor assembly, I was able to apply just enough leverage to snug the tie around some slit kapton tubing supplied by Corey around the copper braid around the CPS cable. 2) Dressed the cabling for the Corner3 CPS cables on the NE side of Stage0 before heading into the 5-way Cross. 3) Changed the CU gasket on the 4.5" conflat and torqued it down.
Updating FRS 9477 but it remains open.
Also put a cable tie around the bundle of Accelerometer cables sitting in the spool, the idea being that given the impetus, cable might start to slip out of the spool and loop by loop drag the whole pile down and possibly sticking between Stage0 and the chamber shorting HEPI. The whole bundled pile being heavier will be less likely to move.
Travis and Gerardo installed the in-vac Septum flange Wilcoxon single-axis-accelerometer in Nov 2017 (it is oriented in "-Y"). This is under Ticket #4512.
There was a thought of installing additional in-vacuum accelerometers since the in-vac Wilcoxon cable can accommodate up to 8 accelerometers. At LLO one was installed on the OMC cage, but it was deemed not useful. So we opted to NOT install one on the H1 OMC. There was mention of an accelerometer on another axis on the septum would be useful, but since we are under vacuum on the other side of HAM6, that is not possible (& not sure if the clamps can accommodate this).
At any rate, I went ahead and connected the cable to the in-vac side of the D-Flange (specifically: Connector D1 3C2). This cable does not contact the ISI at all; it is in fact, spooled up in the "nozzle" at the Septum.
Photos are attached (the first one is a panoramic [hence no thumbnail preview] showing from flange to flange.)
There is no in-air cable attached. Richard says they can connect something up whenever someone wants to use this accelerometer for testing.
To help prevent this spool of cable from slipping off the nozzle down to the bottom of the chamber, Hugh thought it a good idea to put a tie-wrap on the spool to help it stay put. Here's his alog of this.
Terry, Sheila, Arijit, TJ,
Today we made one more attempt to get the beam from the OPO aligned into HAM5 and out to HAM6, but we haven't found the beam.
Keita loaned us a Nikon D7100 which was much better for getting a clear picture of what we were looking at than the viewer we were using yesterday. Photos will be attached to this alog latter.
FIl also cabled the HAM5 illuminator up to the new beckhoff controls, so we could turn that on and off.
We started out by manually aligning the beam again through the apertures, doing a little bit more careful job this time by using the viewer to identify the edges of teh aperature and center the beam half way. We can still see the beam hitting ZM2 through the HAM5 viewport. We were also able to sometimes see the beam coming out the HAM5 viewport (perhaps going under the fly-offf mirror on the OFI), but latter this afternoon we weren't able to repeat that. We were never able to see a beam in HAM6.
We are leaving the OPO locked and generating a beam (we again have two soft door covers with a small gap to let the beam out). We have ZM1+ZM2 scanning with an amplitude of 10,000 counts for both pitch and yaw, and SRM scanning 1000 urad.
If this does not work, we may wait for a beam from the PSL to become available and try to see the rejected scatter from the OFI polarizer in the path towards the squeezer.
Here are some images to help clarify what we saw.
I can't find an up to date drawing of the HAM5 layout, but here is a preliminary drawing https://dcc.ligo.org/DocDB/0121/D1500303/002/HAM5.PNG, which shows ZM2 much further in the +y direction than it really is placed. In reality the beam from the OFI to ZM2 runs nearly parallel to the septum.
Here are some photos taken from the easternmost viewport on the north side of HAM 5 (the -y viewport on the +x side of HAM5). The first photo is a blurry overview of what we can see, the fly off mirror for the squeezed beam is in the center (there is a black glass clip on the back of the mirror), behind that you can see the cage of ZM2. The violet looking thing that is just peaking over the black glass clip is our beam or scatter from our beam.
The second photo shows that at some alignments on ZM1/ZM2, we can see a quite bright thing in HAM5 which is probably our beam. The fourth photo shows an alignment for ZM1 for which the beam clips on the bracket for the eddy current damper on ZM2, while the third photo shows an alignment of ZM1 where we think the beam should be hitting ZM2. You can see some difuse IR light, and what looks like the outline of the black glass clip in that scattered light. This seems like a good candidate for our best alignment, you might think that this scatter means that the beam is hitting or nearly hitting the fly off mirror with the black glass clip, however, we saw nothing in HAM6 for this alignment.
A few images and notes to help
1) Photo of path from ZM2 to OFI bench, from LHO alog 39663 and "big picture 1" see links below.
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=39663
https://alog.ligo-wa.caltech.edu/aLOG/uploads/39663_20171206192338_ZM2_BigPicture_1.jpg
2) LIGO-D1500303 linked above is / was a temp (preliminary) layout. Refer now to SYS links below. We have added a note to D1500303.
a) LLO
LHAM5 - LIGO-D0900456
ZM2 - LIGO-D1600094
b) LHO
WHAM5- LIGO-D0901129 (please note this top level is pending, refer to D1700472 and D0900456 for now)
ZM2 - LIGO-D1700472
Hope these help. Corey A, Eddie and Calum
Per request, pictures attached of the cryopump bake enclosure installation. The installation took two days and several modifications were made before and after the bake commenced in an effort to create more uniform heat zones within the enclosure because the bottom is not achieving target temp. Modifications include:
Improvements for future designs:
Adding Al foil wrap to help insulate.
