HAM5 SUS TFs Now Clear; OK for Doors

J. Kissel, T. Shaffer

While ZM2, SRM, and SR3 show clean and clear transfer functions as soon as we were out of chamber, the OFI gave us a little scare. All is OK now, but see the story below.
Given Jim's positive assessment of the ISI (LHO aLOG 41313), and now our positive assessment of SUS (this aLOG), 
I conclude that we're ready put doors back on early tomorrow morning.

Again -- excellent work team!!

We took all DOFs for all HAM5 SUS listed above (at a 0.02 Hz resolution) to ensure goodness, and all now appear good. I attach a smattering of the DOFs as proof.

Details of the OFI scare:
The magnitude of all DOFs of the OFI TFs showed a decrease of a factor of 20 or so (see first attachment, blue trace). Knowing we hadn't messed with electronics, a time-machine of the MEDM overview screen made me quickly realize what should have been obvious. The added weight of the new OFI SQZ path picomotor shifted the balance of the OFI in roll enough to completely close-light the OSEMs, so they were barely reading ~hundreds of counts off the ADC when they normally should be centered at ~15k cts. As such, TJ and I quickly ran out to HAM5 again and centered the OSEMs back to ~15k ct off of the ADC. This returned the magnitude of the TFs to normal. There's a bit of fishy-ness happening at around ~1.6 Hz in a ll the TFs, but even if it is cross-coupling because the OSEM's aren't aligned ( in the plane perpendicular to the sensitive axis), that shouldn't matter for the suspended performance. The Qs of the primary resonances look as they did before, and there's no evidence for rubbing there.

EY pump down

Started roughing out EY this morning after door installation yesterday and overnight purge. I started the turbo at around 0.8 Torr late this afternoon and pressure came down nicely until it reached high e-4 Torr range. I'm not sure if this is normal for a wet volume or if we have a big leak. The purge air blow down dew point measured -11.4C which is relatively high (-25C or below is best). We will try to leak check tomorrow the newly installed parts (rebuilt IP11 + chevron baffle + 12" GV, new HV NEG pump + housing).

BSC10 annulus volume was pumped with turbo cart yesterday. It reached e-6 Torr quickly (indicating no o-ring leak) and then was valved out for the night (no auto safety valve). It was pumped with cart all day today and about mid day I turned on AIP. It displayed all 10 LED lights (high current/high pressure), but the top light was off (not over current). After several hours with help from cart, it did not change state. I isolated the AIP and waited several minutes - no change. We may need to replace this AIP. I think it's an original and may have been vented with air while powered ON during a door removal several months ago. I will valve in cart and resume pumping tomorrow.

TCS Chiller Pump Rebuild

The TCS chiller pump has been rebuilt and should be ready to act as a back-up now. In the future if the water pump needs to be rebuilt it uses a a type 21 shaft seal, 5/8" shaft size, 1 1/4" seat bore. The replacement o-rings are 4x dash number 012 and 1x dash number 242. It also uses a standard external retaining ring with a 5/8" OD. Use a light grease to seat the shaft seal, or else the rubber will tear (voice of experience here, oops).

 The chiller is currently running in a small closed loop to see if any leaks develop overnight, it is on the mezzanine with its other siblings.

Today's HAM5 incursion

Nutsinee Kijbinchoo, Terry McRae, Jeff Kissel, Keita Kawabe, Daniel Sigg, TJ Shafer, Sheila,

• When we entered HAM5 we found that the beam from the OPO, which was centered on the apertures in HAM6 in preparation, was hitting the ECD bracket on ZM2 (photo).  
• We decided not to translate ZM2.  Corey Austin had looked at a Zeemax drawing of the location of ZM2 and found that based on the nominal locations in solid works, we could increase the aperture on the face of ZM2 by 3 mm if we moved ZM2 by 50 mm in the -X direction.  Since we weren't sure that the solid works model is really showing an accurate position of ZM2, and we were short of time, we decided not to translate it this time.  Nutsinee took some photos that show the location of ZM2 more clearly than what we had before.  
• Jeff K adjusted the yaw of ZM1 to get us the best clearance we could on both sides of ZM2.  (In the attached photos you can see our measurement technique for the clearance on the -x bracket and +x bracket.  The edge of the card is against the edge of the bracket in both photos, and the bean is just a bit further from the edge than the T on the card in both cases.  From the edge of the card to the T is about 1+1/16th inches, so the beam is about 1.1-1.2 inches from the inner edge of the slots on the bracket.  Based on the drawing of the new ECD assembly and the bracket drawing, the inner edge of the bracket is 0.61 inches from the inner edge of the slots, so the beam is about 14 mm from the inner edge of the bracket on each side if we are looking at the optic face on. 
• With this we only needed a small adjustment of ZM2 yaw to hit the center of the two fixed steering mirrors on the OFI.  We saw the beam hitting the aperture on the rear of the SRM baffle low and in the -x direction, so we adjusted both pitch and yaw on the second OFI steering mirror (the -y  one).  With this mirror we were able to get the beam into HAM6.  
• We used the SRM alignment found on Feb 8th
• We couldn't see the beam in transmission of OM1, so we decided to center it on OM2 and we think that this should be good enough to allow us to co-align the squeezer and the IFO beam once we have the pico. (before photo shows location of beam on OM2 before pico was swapped in.)  
• After we had that alignment we swapped in the picomotor which was already mounted.  Keita adjusted this by hand so that the beam came out very nearly centered on OM2.  We made the final adjustment of the beam location on OM2 using the new picomotor (after photo).
• We swapped the brackets on ZM2 without encountering any problems.  
• After we were out of HAM5, we roughly placed the apertures in HAM6 on the new beam alignment, in case we have any difficulties finding our beam once we are pumped back down. 
• TJ, Jim and Jeff K are right now checking transfer functions in HAM5, found that the OFI osems weren't centered, TJ and Jeff K have gone back to center them. 

yak

HAM5 tfs seem okay

Damping loops and isolation loops will turn on, but the care I had to take in tuning the tf drive made me suspicious of rubbing. I've looked a couple times in chamber and can't find anything, so not sure what else to do. Eventually got cleanish looking tf's so maybe it's just high purge? I think we are fine to put doors on.

Out of HAM5 Chamber; Success in it; No Doors 'til Morning

M. Dodson, S. Dwyer, B. Gateley, T. Guidry, K. Kawabe, N. Kijbunchoo, J. Kissel, T. McRae, C. Romel, T. Shaffer,  D. Sigg, J. Warner

We're done in HAM5, taking close-out transfer functions. No doors until the morning because we handed off to the team at ~4:15p PDT, and Chandra made the call that a ~two hour door adventure wasn't worth it. 

MUCH more details to come, but We were successful in all vent activities today: SQZ beam has been realigned to and through OFI, reflected off of SRM, and into HAM6 OMs. New ZM2 ECD brackets installed. Pico motor for OFI SQZ Path Steering Mirror installed.

GREAT WORK ALL!!

Shift Summary - Day

TITLE: 04/05 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:

13:20 (6:20) Peter to PSL

14:07 (7:07) Chris, Mark, Tyler to LVEA -- HAM5 door removal

14:12 (7:12) Kissel, Warner to HAM5 -- locking HEPI

14:30 (7:30) Jeff to HAM5 -- check CC kit

14:35 (7:35) Peter out of PSL

14:45 (7:45) Jeff out of LVEA

14:45 (7:45) Jeff to EY -- reset dust monitor

15:00 (8:00) Kissel, Warner back from HAM5

15:00 (8:00) Start of shift

15:29 (8:29) Chandra to EY -- start pumpdown

15:42 (8:42) Fil to EY -- assist with dust monitor reset

15:43 (8:43) Sheila to LVEA -- ask about cable

15:49 (8:49) Karen to EY, MY

15:52 (8:52) Kissel to LVEA -- make sure there’s a phone in the LVEA

15:59 (8:59) Kissel and Peter to PSL -- lock out rotation stage

16:07 (9:07) Kissel and Peter out of PSL -- shutter is closed

16:11 (9:11) Jeff back from EY

16:33 (9:33) Bubba to HAM5

16:37 (9:37) Kissel, Warner to LVEA -- contamination control/lock HAM5 ISI

16:42 (9:42) Bubba back from LVEA

16:55 (9:55) Sheila transitioning LVEA to Laser Hazard, starting HAM6 alignment

17:15 (10:15) Keita to HAM6 -- assist with alignment

17:26 (10:26) Mark, Tyler out of LVEA -- doors off

17:43 (10:43)  Mark, Tyler to LVEA -- moving IP3

17:56 (10:56) Sebastien, Dan to LVEA

17:58 (10:58) Richard to MY

18:00 (11:00) Tyler out of LVEA

18:03 (11:03) Tyler to LVEA --continue IP3 work

18:08 (11:08) TJ to HAM6

18:16 (11:16) TJ out from HAM6

18:22 (11:22) Terra, Evan, Miriam, Jenne to HAM6

18:27 (11:27) Karen to H2 Electronics Room

18:31 (11:31) TJ to HAM6 -- finding wrench

18:51 (11:51) Evan, Miriam, Jenne out of HAM6

18:55 (11:55) Terra out of HAM6

19:33 (12:33) Mark, Tyler out of HAM6 -- lunch break

19:45 (12:45) Sebastien, Dan out of LVEA

20:03 (13:03) Jim to EX -- replace BHCS on PCal periscope

20:38 (13:38) Mark, Tyler into LVEA -- attach valve

20:42 (13:42) Kissel, Keita, Sheila, TJ, Nutsinee, Terry, Daniel out of LVEA -- lunch break

20:49 (13:49) Sebastien, Dan into LVEA

21:06 (14:06) Kissel, TJ, Sheila, Keita to LVEA

21:07 (14:07) Peter to PSL enclosure

21:11 (14:11) Georgia to HAM5

21:15 (14:15) Jason to PSL enclosure

21:17 (14:17) Chandra to MY, EY

21:29 (14:29) Jim back from EX

21:42 (14:42) Georgia out of HAM5

21:58 (14:58) Terra to LVEA

22:05 (15:05) Tyler, Mark out of LVEA

22:05 (15:05) Tyler, Mark to MY, EY

22:32 (15:32) TJ out from HAM5

22:34 (15:34) Dan, Terra, Sebastien out of LVEA

22:41 (15:41) Jeff and Chris to HAM6 -- contamination control

22:47 (15:47) Sheila transitioning LVEA to Laser Safe

22:49 (15:49) Jeff back from HAM6

22:51 (15:51) Terry, Nutsinee back from HAM6

22:55 (15:55) Chris to LVEA -- put HAM5 doors on

22:58 (15:59) Tyler, Mark to LVEA -- put HAM5 doors on

23:00 (16:00) End of shift

LVEA transitioning to LASER SAFE

Sheila is transitioning the LVEA to Laser Safe.

BRS Trends FAMIS Task

I've made some changes to the BRS FAMIS script to include some auxiliary channels. These extra channels are on a second plot that should be posted with the drift mon trends on the first plot. All the plots should be color coded, blue for ETMX, red for ETMY. All plots are timeseries for the same 7 week time frame. I've started updating the script so LLO can use it if they want, but I'm not sure which nds server to use. I use h1nds1 for LHO.

Otherwise, BRSY is getting close to going out of range, BRSX has gone out of range, but looks like it was due to a temperature excursion. I'm not sure we should do anything for either one, until the chamber work is done and the cleanrooms are turned off.

EY pumping

Started roughing down EY this morning with QDP80. BSC10 door annulus is pumping with cart. Karen pointed out a small water leak (drip) near QDP80 in mechanical room. We'll keep an eye on it.

Verified high voltage is off.

Blow down dew point measured -11.4C.

HV NEG and IP11 are valved in.

LVEA transitioning to LASER HAZARD

Sheila is transitioning the LVEA to LASER HAZARD.

PSL Power Reduced to 100 mW, PSL Rotation Stage Locked Out

S. Dwyer, P. King, J. Kissel

Shiela reduced the 1064 nm laser power coming from the PSL going into the vacuum system via the PSL's rotation stage down to 108 mW (measured down stream of the PSL rotation stage, H1:IMC-PWR_IN_OUT16) to 108 mW, then Peter and I locked out the rotation stage controller. We've confirmed that requesting adjusting rotation stage angle does not change the power after locking out the controller.

It's currently laser SAFE (the PSL light pipe has been shuttered as normal), but in case we need the PSL light for alignment later, I figured we'd get the procedural stuff done before we need it. Due to IMC particulate concerns, we wish not to have higher than ~100 mW in-chamber while in air, so as to not burn stuff into a flashing IMC (see M1300464).

Dust Counts Before HAM5 Door Removal

J. Kissel

I gathered a dust count reading before doors were removed this morning. Counts are zero and zero!

HAM5 HEPI Locked

J. Kissel, J. Warner

In prep for today's vent, Jim and I locked HAM5 HEPI. 

Displacements between locked and unlocked are on the order of ~20-30 um, and 5-10 urad from nominal floating position with IPS-only, "position" loops closed. See attached screenshots, but I recap pertinent info below.

    dX    -2.3 um
    dY   +17.6 um 
    dZ   +23.7 um
    dRX   +1.2 urad
    dRY   +4.1 urad
    dRZ   -8.7 urad

I also attach pictures of the locking bolts / set screws. To lock HEPI (while attempting to preserve alignment):
    - Procure a CDS laptop, and open MEDM to get the DC BIAS screen of the given HEPI you want to lock
    - Take a screen cap of the screen before you get started.
    - Run all set screws and bolts into such that they're barely contacting the floating cube in each / every corner.
    - Using the appropriate allen wrenches (you'll need two sizes, 3/16" and 1/4"), and while watching the attached displacement screen, gently nudge the bolts further into contact until tool tight, rotating between bolts / set screws so as to not crank on any one bolt more than the others for a given tightening iteration. It's fine to do this sequentially around the corners. 
    - Displacements from nominal on the order of a few 10s of um / urad are the precision you'll be able to lock the position.
    - Take another screenshot of the position and displacement once done and record.

This process takes about 20-30 minutes.

    

PT246B 12 hour trend

Minute trend plot of PT246B for the last 12 hours attached per Gerardo's request.

Vacuum summary for the day

Gerardo, Mark D. Tyler, Chandra

Corner

• Torqued IP5 studs metal on metal
• Got XBM & YBM on turbos/scrolls and leak checked:
  • IP6 valve (beam tube side) and PT-170 gauge with background at 3.1e-9 Torr-L/s (there will be no IP6 installed here until rebuilt unit ships from vendor in May)
  • IP5 + valve with background at 2.0e-9 Torr-L/s. We had some troubles pumping down IP5 with pump carts. The little red "cube" kept tripping, even with a 'hung' turbo. The trusty old pump cart survived the long wait through ~10 Torr. We thought we had a big air leak somewhere, but all checked out. IP5 isolation gate valve was left open to pump down with main YBM volume
  • New GV on XBM turbo is leak tight with background at 3.3e-9 Torr-L/s
• Vented vertex
• Loosened bolts on IP3 to prepare for R&R tomorrow (no, not that kind of R&R). Left its isolation GV open
• Loosened HAM5 doors bolts

EY

• Torqued IP11 stack studs metal to metal
• Installed BSC10 door and successfully pumped down annulus (i.e. no leaks)
• Turned on QDP80 to warm up
• Purge air scroll #4 is loud, so we turned it off for now. Might be a bad one-way valve
• Connected charged battery pack for turbo

We will start roughing down EY tomorrow.

Prior to corner station vent, high voltage has been turned off (as per items mentioned in M1300464).
    - ESD driver
    - Fast shutter de-energized
    - OMC's PZT actuator drive
    - Picomotors
ITM Ring heater's measured power is zero (power is off at chassis), and I've changed the requested power to zero via MEDM.

The net pump speed of this diaphragm backing pump is "much" less than what we are used to. I used this portable pump station for the first time the other day to evacuate 4 lengths of 1.5" flex line + the volume between IP6's closed GV and the zero-length reducer and it took "minutes" not seconds.

ETMY Closeout, again.

This afternoon, Travis and I pulled the First Contact on the ETMY HR surface.  WE measured charge via the standard procedure at the back of the AERM before and after.  We had a hard time blowing with 10-20psi DI N2 to reduce the charge originally at ~12V to under 3V.  More detail on this in attached alog shortly.

AFter we were satisfied with the final "dis"charged state, we then set the lower earthquake stops/lock nuts on the ETMY, and pulled the ACB (arm cavity baffle) back down into it's nominal position.  I noticed however that the ACB felt like it was rubbing on something when I bounced it vertically.  Inspection revealed that one of the earthquake (EQ) stop bars D1201235 was rubbing the down tube in the roll direction.  I moved weights around on the top of the box in an attempt to free it, however I ran out of range.  Either this unit has been rubbing for a while, unnoticed, or sometime during this last few months of vent work we jostled it enough to twist something like the flexture, blade, down tube shaft, or box.  In consult with Calum and Jeff K, the consensus was to just remove this EQ stop bar since it only constrains the ACB in the less critical roll and yaw motion which have other mechanical backup restraints.  Of course removing the long bar proved difficult because it was trapped between the unit and the chamber wall.  Travis was able to convince it to come out via bending it's tip.

Will file an FRS for this to be investigated further when we have more time/people power than today's closeout mustered up.

After Jim unlocked the ISI, Travis cleared the chamber of tools/stools/CC supplies.  Note, we did not pull any of the freshly placed 3" or 1" samples in this chamber left during closeout just a few weeks ago - all CC kits had already been pulled and I could not organize to get help with this.

Travis and I have been running TFs on the main and reaction chains of ETMY and things look good.  We are good to put the door on tomorrow morning asap.  (Note, Mark D and Tyler have it hanging on the engine hosit ready to go.)