WHAM5 ISI Balanced--TFs Started for tonight

Hugh & Brijesh

We finally got the ISI unlocked after letting OFI crew remove a final iris and securing the new OFI OSEM cables.  The unlock was very difficult as the payload was very light.  Ultimately we had to move a 10kg mass from the edge of the table top to the center and then still add almost all the additional payload I had available in the LVEA.  Finally though, we got it well balanced and the lockers of course are much easier now.

We left the covers pulled out and JimW has already started the long TFs to run overnight.

In the morning, I will consolidate a few masses and document the new payload for SYS As-Built.

HAM2 B&K Hammered

J. Kissel, J. Warner

Jim and I hammered components in HAM2 this morning, including:
    - IMs 1-4 with Baffles re-installed with Viton (LHO aLOG 39654)
    - PRM Cage (hammering the cage instead of the baffles)
    - PR3 Cage (hammering the cage instead of the baffles)
    - All three HAM table baffles (Minus Y, Middle, and Plus Y)
    - PR3 Table Top Baffle

Pictures attached, analysis to-come.

ITMX, ITMY, and BS Elliptical Baffles B&K Hammered

J. Kissel, T. Sadecki

We've closed out B&K hammering of BSC2 today by grabbing transfer functions of the ITM elliptical baffles (D1101806) and the Beam Splitter Cage and elliptical baffles (D1200750).

Picture of setup attached. Results to be processed and posted later.

Measurement Notes:
- For the ITM elliptical baffles (which were freely suspended during measurement), we attached the accelerometer to the inner-most thru-hole on the bottom plate.

- For the BS Cage, the accelerometer position shown in 5468 seemed no longer available at the time (though now looking at pictures, it was), so we went for using the thru-hole in the center of the structure as pictured.

- To reach BSC2, we extended the manufacturer's hammer and accelerometer cables with newly constructed 20 ft. cables courtesy of Richard and Filiberto (THANKS Y'ALL!).

ITMY test mass cleaning started

This afternoon I

- maked the First Contact spray solution

- brushed up on the spray procedure

- staged supplies near door

- donned the PPE

- aligned the cone to seal onto the ITMY HR surface

- sprayed the ITMY HR

- removed the cone.

Tomorrow I will finish reinforcing the outer ring of the coating and add the pull tab.

HAM4 Closed out

Betsy, Travis, bit of Kissel, Bubba/Tyler/Mark

 

Already eluded to in previous alogs, but HAM4 has been closed.  The usual steps were taken:

- ~9:30am  Lay/mount 3' witness wafers

- Wipe table and ISI reachable surfaces

- Pull FC previous painted on SR2 and HWS DCBSx and DCBSy

- Unlock SR2 SUS and lock down nuts

- Checklist E1201035 checked throughout this to check for tools, dust counts, etc.

10:50am  Dust counts at S door during this activity with Travis and I near the door were:

0.3u  80

0.5u  40

0.7u   0

1.0u  30

- Run quick 6 DOFs of SUS (some troubleshooting needed - cables recheck by Fil OK, BIO state needed switching, vertical stops needed resetting since apparently rattled down during 5mm slide, TFs finally pass)

- Unlock ISI

- SEI discuss and quick medm check ISI, pass

- Hunt down the Signoff sheet on DCC, then found it to be out of date, spent 30mins hunting people down - people either weren't the appropriate people to sign, or were on travel.  Vern is updating sheet and reprinting for future chambers.

- Doors attached ~12-1.

Shift Activity

TITLE: 12/07 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:

16:00 LVEA is LASER SAFE

16:01 Christina and Karen are in the LVEA

16:27 Tyler and Mark out to MY

16:35 Fil and Jeff B out to HAM2 for ground loop checking/repair

16:36 Terry going into the squeezer bay

16:51 Betsy out to HAM 4/5 area to prepare for putting doors back on.

16:52 Chandra out to GV4. Will possibly be using the W Crane

16:54 Tyler and Mark are back

17:01 Travis out to HAM4 area for door closure

17:07 Peter out to LVEA

17:08 Dr Stefan Balmer on site

17:09 Christina and Karen out of the LVEA

17:13 Peter out

17:28 Chandra out (temporarily)

17:34 Mark and Tyler going into LVEA to crane HAM doors to a staging area for afternoon installation

17:41 Jim and Jeff K out to HAM 2 to B&K hammer

17:46 Chandra into LVEA

17:51 TJ heading out to LVEA/TCSX.

17:54 Fil and Jeff finished with HAM2. Fil moving to ITMs to continue ground loop checks.

17:57 Re-aligned/damped all HAM2 suspensions

17:59 Bubba into LVEA for crane/door work

18:06 Peter and Umakant out to PSL enclosure

18:15 printed out dign-off sheet for door activity for Betsy and co.

18:29 Richard out to LVEA

18:20 TJ out

18:21 N in to squeezer bay

10:26 Fil and TJ into the LVEA

10:35 Richard out

10:51 Mark and Tytler out

18:59 Took HAM5 suspensions to SAFE/UNDAMPED for Fil and Jeff B ground loop checking

19:03 Dave B and Arnab going to out buildings

19:07 Mark and Tyler back into LVEA

19:08 Brijesh out to Output arm area to observe

19:10 Vern out to LVEA (no-op)

19:14 Siddesh out to LVEA(no-op?)

19:15 Terry out of LVEA (no-op)

19:24 Mark in and out of LVEA to deliver canned air to Jeff K at HAM2

19:32 Dave B and Arnab at EY

19:32 Richard out to LVEA

19:38 Richard out

19:45 Betsy out

19:49 Travis out

19:52 Jason and TJ are out

19:57 Dave B and co. checked in from MX

19:57 Peter and Umakant out

19:59 Jeff K and Jim out

20:08 Mark, Tyler, Bubba, and Siddesh out for lunch

20:09 HAM4 N Door tacked on

20:13 Dave B checked in from EX

20:30 Fil out

20:34 Jeff B out

20:36 Dave and Arnab back

20:39 N out for lunch (no-op)

20:52 Travis and Jeff back out

20:59 Hugh out to HAM5 for ISI balancing

13:00 Vent Meeting

21:05 Tyler, Mark and Bubba out to LVEA

22:07 Sheila into Optics lab

21:10 TJ and Jason back out to LVEA

21:20 Fil out to LVEA

21:24 Jeff B in with Fil

21:39 Gerardo into LVEA (no-op)

21:53 Betsy into LVEA

21:54 N into squeezer bay

22:07 Jeff B and Fil out

22:09 N card showed undeclared

22:13  Bubba out

22:19 Gerardo out

22:24 Richard into LVEA

22:30 Richard out

22:39 Jeff K out

22:56 Chandra into LVEA

22:57 Tyler and Mark out

22:58 Terry back out to squeezer bay

23:14 Cheryl out to HAM2 to investigate IM3

23:15 Jeff K into LVEA to take pics at HAM3

22:17 Jeff K out

23:25 Dave B out to HAM5 to deliver a laptop to Hugh

23:39 Bubba and Bailey into the LVEA

23:47 Jason and TJ out

23:49 Chandra out

23:58 Cheryl out

 

HAM 4 annulus pump down

Pumping HAM 4 annuli with aux cart #5 and hung turbo. Started at 3:39pm local. After 10 minutes of pumping, CC gauge reads 4.3e-4 Torr.

RO Water Heater

I spoke with the manufacture of the failed water heater this morning. The factory rep indicated to me that if the failure is with the heat exchanger, which I believe to be the case, that it is covered under warranty. I have removed the heater, packaged it, and shipped it back to them in Florida for inspection and repair.    

HAM SUS Ground Loop Checking Status

Ground loop checks for SUS have been completed for the following HAM's:

HAM2, HAM3, HAM4, HAM5, and HAM6.

Multiple shorts to ground chamber were found and addressed. Many cables required the in-vacuum cables to be disconnected at the flange and re-seated. See alog 12528 for similar issues of four screws touching the feed-thru if not recessed completely.

HAM 3 gave us the most difficulties. In-chamber shorts were found at one of the table brackets. We also suspect air-side cables SUS-3 and SUS-26 to be faulty. To convince ourselves we had no grounding shorts in-chamber we disconnected the following air-side cables and tested directly at the air-side feed-thru: cables SUS-3, SUS-2, SUS-25, and SUS-26.

Same was seen on HAM5 for cable SUS-20.

Testing of OFI and SQZ ZM(tip-tilts) all passed.

TCS temperature sensor - Read about 110 ohms on pins 1/2 and 14/15 which does not agree to drawing. According to D1102257, two sets of RTD's should be seen on pins 2/3 and 14/15 and on pins 12/13 and 24/25.

Shorts were also found in the BSC chambers that still need to be looked at:

ITMX - SUS-42, SUS-57
ITMY - SUS-9, SUS-17
BS - SUS-81, SUS-82

Please note that moving cables in-chamber can produce shorts. Please use caution when doing final closeout activities.

Translating which BSC SUS cables correspond to which, from D1100022,

ITMX - 
   SUS-42  = M0 LF RT, R0 LF RT OSEMs' signal chain, from vacuum flange to field sat amp
   SUS-57  = L2/PUM UL LL UR LR OSEMs' signal chain, from vacuum flange to field sat amp
ITMY - 
   SUS-9   = Reaction Chain's (R0) F1 F2 F3 SD OSEMs' signal chain, from the vacuum flange to the field sat amp
   SUS-17  = L2/PUM UL LL UR LR OSEMs' signal chain, from vacuum flange to field sat amp
BS - 
   SUS-81  = M1 F1 F2 F3 LF OSEMs' signal chain, from vacuum flange to field sat amp
   SUS-82  = M1 RT SD OSEMs' signal chain, from vacuum flange to sat amp

HAM 4 DOOR(s) INSTALL

Bubba, Mark Dodson, Tyler Guidry

We installed both HAM 4 doors today and tightened door bolts. 
I informed Chandra and Kyle.

unexplained alignment change in IM3

I checked the alignments of the IMs since I finished working yesterday, and found that IM1, IM2, and IM4 recoverd their alignments when restored this morning, but IM3 did not, it has a significant change in alignment in pitch and yaw.

IM3 change in pitch is ~-1000urad, and change in yaw is ~-1500urad, however the alignment sliders are at (0,0), and have been since yesterday, so there's no apparent reason for the change.

IO IM4 (SM2) transmission

The optic that is installed in IM4 is SM2-01, and from the document T1200140-v1 I've identified it's transmission to be roughly 5900ppm, p-pol.  For a 160uW incident beam, the transmission would be approx. 1uW.  The transmitted beam is split evenly between IM4 Trans QPD and the ISS array, so at 160uW incident on IM4, each of the two transmitted beam paths has about 0.5uW of laser power.  

Witness Plate in Output SR Tube

Chandra requested that a witness plate be put in the output tube section under a port where a proposed new VE pump will go.  This morning, while closing out HAM4, I went in and laid this plate (in a horizontal holder) in the specified location.  Pictures below.  While doing this, I also inspected the floor and found many large particulate pieces.  I spent some time carefully wet wiping, and picking up (with tweezers) fuzzies, fibers, and other bits, which were along mostly the central part of the tube.  All of this is has likely been tracked in from the trips down this tube for work.  I am skeptical of the in-chamber shoes which are top of my list as being the probable fuzzy contributor.

Note, the last witness plate picture is just showing the particulate I removed from the tube and brought out to dump on a wafer for easy inspection.  Looks to be fuzzies, glove bits, metal, body parts... usual stuff.

BSC HEPIs don't lock 'down,' only up and sideways

Just to inform here.

The mechanical design of the BSC HEPI hardware does not provide for locking the platform 'down.'  It only holds the platform up and locks it horizontally.  Additionally, many of the horizontal locks are very difficult to access; so, we tend to pinch tangentially but only push in radially on each corner for a platform lock down.  As a result, when we unload a HEPI, such as when a Quad is removed for TM rework, the HEPI is at risk to lift while under-weighted.

The removal of the ITMX for optic replacement presented just such a situation to study.  The attached 80 day trends of the ITMX cartesian IPS positions show what happened in this case.  Alog entries sync clearly with shifts seen on the IPS and naturally with the largest seen on the Z dof.  With only 25um of vertical shift seen on the IPS, it may be that there is actually no shift or slippage in the locks but only distortion in the system...Although I'm trying to visualize what is happening and... hmm, not sure I see it.

Regardless, slip or distortion, you can see the platform has basically returned right back to where we locked it once the ITMX was returned although it took weeks to do so maybe suggesting a slip stick process.

AWC In-Vacuum Mirrors and Beam Dump Installed and Aligned

J. Oberling, B. Weaver

Yesterday I completed the install and alignment of the AWC mirrors and beam dump on HAM5.  Betsy and I placed the mirrors on the table on 11/30/2017 and intially aligned them (as described below); I then installed and aligned the black glass beam dump yesterday.  The install went smoothly, the only slight hitch being an interfering OFI dog clamp forcing me to slightly move the beam dump from the position called out in the H1 AWC drawing (D1700468); it is ~3/4" closer to the OFI than called out for in the drawing.  The first picture shows the completed install, and the second shows a close up of the AWC beam dump with its slightly changed position.

The optics were aligned using the same laser setup used for the temporary oplev from the SRM swap from earlier in the vent (3rd picture), in which a spare optical lever laser was used in conjunction with a fiber collimator and one of the Brunson tripods from IAS; the viewport emulator (4th picture.  Hi Betsy!) was attached to the HAM chamber to simulate the viewport locations.  The alignment itself was very straigtforward and proceeded with the following steps:

• The beam was centered on the center viewport emulator and the 1st AWC mirror.
• The 1st AWC mirror was then adjusted until the beam was centered on the 2nd AWC mirror.
• The 2nd AWC mirror was adjusted until the beam entered and exited the apertures on the rear SRM baffle.
• Using both AWC mirrors, the beam was walked until it was centered on the entrance and exit holes in the rear SRM baffle.
• The beam dump was installed such that the beam was contained.

After I installed the beam dump, I double checked the alignment and all was still good.  This completes the HAM AWC in-vacuum installation.

HAM5 Baffle Install Finally Finished

We avoided installing the table baffles and the OFI/Septum baffle on HAM5 to keep them out of the way on ongoing work, but yesterday we were given the "all clear" and threw them in. Jim, Jason, and I quickly found all of our bagged hardware and had no issues putting it all on. The top septum baffle panel (D1700280-01) had more than the average number of scratches, noting it here with a few pictures for future info.

Sadly we forgot to get a final set of pictures since we were all fighting hunger. We can snap before the chamber is closed.

HAM3 TFs look clear, ISI still unlocked

I ran long tfs on HAM3 overnight, given the state it's in (hepi locked, in air) tfs look good. Attached plots show  cartesian tfs for GS13s and CPS. Main resonances look clear, all the high frequency (>10hz) crap is from HEPI being locked (I think, it looks worse on the CPS, which is what we've seen in the past). Cabling on the east side looked pretty messy, but doesn't seem to have been a problem.

PSL Chiller Water Level Top-Off

Jeff Bartlett:

16:35 Added 200ml to Xtal chiller

Shift Transition - Day

TITLE: 12/07 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 2mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.29 μm/s
QUICK SUMMARY:

Slick conditions on site due to freezing fog. Otherwise, environmentally calm.