(Corey, Keita, TJ)

Yesterday (Mon), I gathered (4) HR mirrors for installation into Squeezer Tip Tilts (These are E040516iLIGO E040516's).  I basically applied First Contact (on both sides of all optics) & left them over night.  Unfortunately, this morning after TJ & I removed the First Contact, the HR surfaces didn't look very clean.  Keita came to put a second pair of eyes on them, and also felt they were not acceptable.  So, he applied First Contact to them + the remaining other (3) spares for a total of (7).  Documents say they should cure for atleast 4hrs before removing FC, but Betsy said they are generally good after an hour.  So in the afternoon, we removed the FC and inspected.  Out of the (7) Keita worked on, (2) of them were OK/acceptable.  So we are going to go ahead and use these for the HAM5 &6 Tip Tilts.

(The other E040516's were photographed by Keita.  We probably no longer have any usable spares....other than 3IFO.)

Keita took the (2) acceptable mirrors, cleaned their not-grounded (i.e. clear) barrels with Acetone and then reapplied First Contact on the optics for their installation/transport.  

The plan is to install one or both of these in the Tip Tilts tomorrow (Wed).

Corey and I damped output arm MC baffles. The figure shows the locations of all dampers. We mainly followed details in: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=38757  but placed an extra (fourth) cork at the top of each baffle, and damped one panel gap on the outside, where most of the gaps are not as wide because the bolt spacing is closer.

Got the south side C2 BB Blade damper, flexure damper, and the C3 vertical GS13 can damper installed.  Can't avoid it, now I have to go in chamber to do the rest.  We'll do that tomorrow and get the B&K done.

TITLE: 10/24 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

14:15 UTC Peter to optics lab
15:12 UTC Fire department here to hang 'out of service' tags on all the RFARS
15:30 UTC Bubba and Chris lubricating fans
15:30 UTC Peter back
15:39 UTC Christina to end X to clean
15:50 UTC Cintas through gate
15:52 UTC Karen and Vanessa to end Y
16:07 UTC Filiberto WP 7188, only in CER today
16:07 UTC TJ to LVEA to locate parts
16:31 UTC Hugh to LVEA
16:51 UTC TJ back
16:53 UTC Ed to help Filiberto in CER
16:56 UTC Karen and Vanessa leaving end Y
17:07 UTC Corey to LVEA entrance bay for a few minutes to get contamination control equipment
17:36 UTC Richard to CER to find Filiberto
17:37 UTC Bubba and Chris done lubricating fans in outbuildings. Need to wait for CS.
17:37 UTC DAQ restart
17:44 UTC DAQ restarted, keeping nds0 down to look at its memory
18:14 UTC Corey to LVEA for 15 minutes to look for first contact and green lantern flashlight
18:23 - 18:27 UTC Amber leading school tour in CR
18:23 UTC Paradise water delivery
18:51 UTC Peter to optics lab
19:51 UTC Richard to LVEA, testing PT120A calibration
20:09 UTC Betsy to work on SR2 in HAM4
20:16 UTC Dave taking down h1nds1
20:34 UTC Dave done with nds1, going to CER
20:37 UTC Richard done
20:58 UTC Hugh to HAM4 to install ISI damping
21:47 UTC Corey to HAM4 to install OMC baffle damping
21:54 UTC Betsy done
21:58 UTC Robert to HAM4 to work with Corey
21:58 UTC h1nds1 restart
22:13 UTC Kingsoft water to do service on RO
22:53 UTC Peter done in optics lab

FRS 8198

Today I upgraded the memory capacity on h1nds1 from 48GB to 72GB. This means both nds servers now have the same memory size. Earlier this morning I looked inside h1nds0 to verify its memory card configuration (three 8GB and three 16GB cards).

In conjunction with expanding the memory, h1nds1's daqdrc configuration file was modified to use the additional capacity by changing the buffer size in the 'start main' command from 50 to 100.

h1nds1  has two banks of three DIMM slots (three black, three blue, interleaved). Initially all six slots had 8GB cards. The three black-slot cards were replaced with three 16GB cards.

h1nds1 was restarted twice, once after the memory upgrade, the second with the new daqdrc configuration.

Hugh hit a stopping point on the last ISI damper install since he needed access to the bolts under the SR2 suspension.  Since we are planning to translate that suspension per a new ECR anyway, I marked it's pointing on 2 faces of it's base with dog clamps and then slid it out of the way for Hugh.  He is continuing his work now.

Also had to do a similar mark-with-dogs and move the newly aligned 4" Siskiyou mirror that was also sitting on holes that Hugh needed to access...

The YBM turbo pump was vented with room air to facilitate the replacement of the bellows and 10" gate valve at its inlet (WP7180).  Following leak testing of these new joints, the turbo was left running while backed by its local scroll pump (10" valve closed, WP #7186).  The turbo inlet pressure achieved 1.0 x 10-8 torr (foreline 2.3 x 10-3 torr) after 15 hours.  As such, baking won't be necessary.  

I shut down the clean room, turbo and scroll pumps.  

This completes WP #7180 and WP #7186

Ed, Richard, Fil, Dave:

we tested the ITMY HWWD by disconnecting one of the DB-37 front connectors which simulates a failed OSEM-LED. I modified my MEDM screen to show the countdown of the Time To Fail (TTF). I also added a red border if the TTF minute value falls below 19 minutes. Attached screens show the countdown at the 4 minute mark, and after the SEI (ISI) coil drivers had been powered down. In this test this happed at 0:20 in the count down.

Everything looks nominally ok.

at 10:37 PDT I restarted the DAQ in order to:

rsync with h1omc's ini file (following units typo correction)

temporarily remove H1EDCU_CONLOG from DAQ (while conlog is down)

use the latest Squeezer Beckhoff EDCU ini file (H1EDCU_ECATC1PLC4.ini)

The EDCU is now GREEN again, we should investigate if it turns RED.

While doing my usual Tuesday morning rounds of the PSL system, I noticed the crystal chiller was starting to get low on water.  I added 150 mL of water; while this didn't quite top the chiller off, it got pretty close.

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8445)

With the ISS OFF, I adjusted the operating current of the HPO DBs.  Changes are summarized in the below table; a screenshot of the PSL Beckhoff main screen is attached for future reference.

I did not adjust the operating temperatures of the DBs.  The HPO is now outputting 154.2 W and the ISS is back ON.  The completes FAMIS 8445.

PSL Power Watchdog Reset (FAMIS 3673)

I reset both PSL power watchdogs at 16:23 UTC (9:23 PDT).  This completes FAMIS 3673.

Per request I repeated the burtrestore of the SUS alignment offsets done in alog 38730.

patrick.thomas@zotws3:/ligo/cds/lho/h1/burt/2017/08/24/20:10$ burtwb -f h1ifoalignepics.snap

I then zeroed the offsets for ITMX.

The first image is a screenshot of the offsets before the burtrestore. The second image is a screenshot of the offsets after the burtrestore and zeroing ITMX.

Yesterday, prior to walking down the Y-beam manifold from in-chamber to inspect the Cryo baffle and alignment beams, Travis wiped some surfaces.  When he wiped the Gate Valve 1 trough he picked up numerous macroscopic  bits that I'd guess are viton from the o-ring which have shed during cycling.  He also picked up what I will assume is black oxide (seems like what we've seen elsewhere).  These surfaces haven't been touched in many years, so I'm not really surprised at these findings.  See picture below.

As a complement to Greg's aLog regarding checking the X arm cryopump baffle for interference, I checked the Y arm cryopump baffle while I was assessing ITMy pointing today.  The clearances look even better than the X arm with several millimeters of clearance on both ECD blocks.  See attached pics.

TITLE: 10/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

15:42 - 19:29 UTC Jeff K. to LVEA to take in chamber violin mode measurments of ITMX
15:48 - 15:53 UTC Travis to bier garten to get 1st contact for Corey
16:27 - 17:47 UTC TJ to HAM5 to put target on SR3
16:32 - 17:53 UTC Jason to BSC1 to check the aux alignment laser assembly in front of ITMY
16:42 UTC Travis to bier garten to help Jeff K. with violin mode measurements
16:45 UTC Betsy to BSC1 to look at elliptical baffle alignment
16:50 UTC Chris to end Y chiller yard to check a filter
16:54 UTC Gerardo toggling PT124 off/on
18:02 UTC Kyle WP 7186
18:16 UTC Corey to optics lab to clean optics for tip/tilt
19:07 - 23:02 UTC Peter to optics lab
19:12 UTC Robert to LVEA to prep for BSC entry
19:13 UTC Chandra going for jog along X arm
19:29 UTC Jeff K. reports Travis and Betsy are back
19:44 - 19:52 UTC Jeff K. to CER to take pictures for Rolf
20:07 UTC Travis back to ITMX to continue violin mode measurements
20:30 UTC Betsy to BSC1, XBM, ITMY alignment
20:38 UTC Jeff K. back to ITMX to continue violin mode measurements
20:56 - 22:18 UTC TJ to table by HAM4 to rebag hardware
21:03 UTC Corey to cleaning area to grab flashlight
21:16 UTC Robert back for lunch
22:49 UTC Jeff K. back, reports Robert measuring elliptical baffle resonances, Betsy and Travis still in chamber

[Gregg, Jason, Aidan, TVo, TJ, Jon]

We located the correct Siskiyou 2" mirror mounts (IXM200) for the HAM4 work this morning. Thanks to Corey, who pointed us to two spares that were in the optics lab and were Class A cleaned.

HAM4

Recall that yesterday, we discovered that the 2" mirror mounts that we had been given for mounting the DCBS were DLC mounts, not Siskiyou mounts. The DLC mounts put the optic height 0.5" higher than the Siskiyouu mounts do.

We removed the existing DLC mounts that were added yesterday and removed the dichroic beam splitters (DCBS - T = 300ppm for 1064nm at normal incidence [MI1000]) from these mounts. In doing so, we noted that both DCBS had visible particulates on them. Additionally, the DCBS on the X-arm had a small smudge on the optic and a chip in the barrel. We decided to proceed with the install of the new Siskiyou mounts and assess the action to be taken with the optics after install.

The ITMY laser was turned on again and we were able to use the leakage of this laser through SR2 to align the Y-arm DCBS. We pitched it down a considerable way and confirmed that the reflection from it was dumped on the scraper baffle well below the optical axis.

We adjusted the SR3 alignment to get a ghost beam coming off HWS STEER M1 aligned through the HWSX optics. We installed the new Siskiyou mount on the existing pedestal and noted the height was approximately 6mm higher than neighbouring optics. The pedestal and mount were shifted towards the in-vacuum lens by approximatley 3" (new position is shown in the attached image). Original assembly shown in D1101083-v2.

We centered the DCBS on the laser beam and then adjusted the pitch so that the return beam was dumped on the scraper baffle. For reference, we measured the return beam as it hit HWSX STEER M3 and it was 10mm below the incident beam on that optic. Since the DCBS is approximately 12" away, this puts the reflected beam angle at -1.9 degrees. This put the return beam about 45mm down from center on the HWS SCRAPER BAFFLE.

Conclusion:

The optical mounts are installed and aligned, however, the optics themselves almost certainly need to be cleaned if not replaced. For reference, the HWSX DCBS sees about 300mW of 1064nm light (at about 25W input power into the IFO). The HWSY DCBS sees about 100nW.