CoreyG JimW Zach Chris Rodney Hugh

Re Procedure E1000603.

Yesterday we pulled the Dome from BSC6 at MidY.  We were unable to pull the Dome through the Cleanroom Ceiling Sock.  So after struggling for some time we decided to just pull the softroof off the cleanroom and reinstall after the dome was down.  Other than the delay of trying for a while and then reinstalling the sock, it wasn't too big a deal.

The inner O-ring was stuck for just maybe 6" and presented no problem.

Today we installed the work platforms and generally felt very comfortable working on the ends.  It was relatively easy to step around on the side and had plenty of room to make the connections there.  

The PISI came free of the Support tubes at 6300lbs and fully suspended load was 6410.  It slipped out from between the Support Tubes with no encouragement.  We did find we had too little headroom and re-landed the assembly to remove the Load Cell.  We then connected the lifting rig Master Links directly to the Crane Hook.  If we lowered the Cleanroom by maybe 12", we'd have enough clearance to leave the Load Cell in place.

Laydown of the stack needs more shimming than we planned.  We had ~14" of stacking and will have 16" ready next time.  This required we lower the Support Table further and the chains did mar up the top of the Down-Tube Al.

We replaced the Dome and this time we prepositioned the regular BSC Sock on the Dome.  Once the Dome was over the cleanroom, the SEI softroof was removed, the dome lowered and the Softroof connected to the Cleanroom.  No real issues connecting the Dome.

Thanks to the great crew!  Hugh

Burped GV18 gate annulus accumulated gas into pump cart*Opened GV18 (now Y2 has ion pump pumping)*Valved-in IP5*Valved-out, isolated and spun-down YBM MTP*Burped GV5 gate annulus accumulated gas into pump cart*Opened GV5 (now Y1 has ion pump pumping)*Valved-in IP6*Valved-out, isolated and spun-down XBM MTP

- Used Marc Barton probe to measure UIM with top mass and PEN mass fixed.

- Main Chain UIM mass blade tips lowered to 15mm setting.
     - This induced pitch - so lateral adjustments were performed to reset 5mm spacing.
     - Chain left completely free.

[Corey, Hugh, Jim, Rodney, Zach]
Received verbal approval of Hazard Analysis at lunchtime on Thursday.  So the big activity of removing the BSC dome commenced in the afternoon.  A few notes:
Before lifting the dome from the chamber, the purge air was fully turned on, to help blow any dust from the dome flange area upon initial lifting per Kyle's request.
When Dome was lifted via crane, the dome appeared to be stuck to the o-rings because breaking away from the O-ring was a little bit of a "jolting" action.  
Most of the O-ring was seated in the flange with only a small section being stuck to the Dome.
With the "BSC SEI two-zipper Cleanroom Sock Roof" installed on the cleanroom, we were not able to lift the Dome out of the cleanroom through a fully-opened Roof.  The hole for the sock was just too small for the dome and its protuberances.  So the sock was detached from the cleanroom and lifted out with the dome.  The dome was laid down and then the cleanroom sock was re-attached.
Today (Fri) we aim to remove the stack and we'll see if we have time to re-install the dome...all depends on if we can get it done before the 3pm Christmas Party!

MY BSC6:
- Staging of stack extraction via top opening in the morning
- Uncapping of dome of BSC6 in afternoon.  Sock of mobile cleanroom detached with the dome, and then the sock was reattached.

Other:
- Oscar baled tumbleweeds.  X-arm still closed to traffic.
- Richard worked on FMCS alarms.  Vacuum screenshot available from FOM4, instead of vacuum computer.
- MX alarms today regarding very slight temperature changes...these may be ignored.

added wiper.csh script in /export/home/controls on h2ldasgw0. It 
runs every 30 mins, and just deletes the oldest full frames and
second trend frames directories if /daq-h2-frames exceeds 96%.
It runs as a crontab for user controls.

(Corey, Zach)
HAM7,8,9,&10 Scissors Tables were all adjusted vertically and set to their mid-range position (this would cause a change in elevation of their respective Support Tubes wrt the HAM Chamber E-Nozzles).  This was done for the preparation of HEPI installation later on.  We want HEPI to be connected to Support Tubes in their "ideal position".  Slotted brackets on the Scissors Tables were replaced with "fixed brackets".

Operator:  I confirmed while in manual control that the CP7 liquid transfer line is cold and will permit filling of CP7.  I expect CP7's level to increase and surpass the setpoint off 92% this evening.  Afterwhich CP7 should be under control of the PI loop and any alarms following this should be observed.  

Preparations made for MY stack removal, involving lifting dome off BSC 6.
Corey filed to start relieving scissor springs on HAMs/BSCs in preparation for passive stack removal, but I'm not sure if this task was actually started yet.

Betsy, Jeff and I did a measurement of the maximum obtainable pitch and yaw range on the rebuilt Quad #2 using an optical lever. According to Norna's write up, T1000268-v1 ( https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=11868 ) we should be able to get 1.4 mrad in each direction at the optic. At the DOF Test screen we applied successively offsets of +2556 and -2556 in pitch and +7863 and -7863 in yaw, which with the usual output matrix maxes out (32K) at least one of the OSEMs. The resulting deflections of the optical lever spot were +9.5 and -11.5 cm in vertical (+=down) and +5.5 and -6.5 cm in yaw (+=left). The optical lever baseline was 4.98 m. 

This implies a total range of 1 mrad in pitch and 0.5 mrad in yaw, which is rather less than expected. A big chunk of this is that the actual UK driver boxes for the test stand were not built to the 200 mA max output assumed in T1000268. To check this, the voltage across the face1 coil was measured at the simulated vacuum flange, with 32K-1 of offset applied at the Output Filters screen. The resistance (including that of the cables) was 39.9 ohms and the voltage was 3.69 V implying a maximum current of 92.5 mA.

The fact that the pitch range is larger than the yaw is probably connected with the fact that the fundamental pitch mode frequency is rather lower than in the model, i.e., there is more pitch compliance than expected.

0820 - Diamond Freight arrives
0925 - Corey out to MY to stage Wed. work
0925 - UniFirst arrives
0928 - CP7 Alarms...everything OK.
0943 - Ace here to clean portable toilets
1030 - Gerardo goes out to LVEA to make some measurements by the spool for the cryopump
1045 - PraxAir arrives.
1051 - 110B Sensor Alarms from ETMX and ETMY due to Richard's CDS work.
1055 - Squeezer laser is on

Richard also fixed the outdoor flood light by the Control Room door.

Reminders:
- NO WORK AT OUT-BUILDINGS UNTIL MANAGEMENT SAYS OTHERWISE.
- Jodi is off-site.
- HAM12 doors still off

(Y-end)  I noticed early in the afternoon that the dewar pressure following the delivery to Y-end (CP7) this morning was way too high, i.e. 42 psi (nominal is 15 psi).  The driver may have neglected to open the manual relief valve to allow for the displaced vapor to be relieved as the liquid column was rising while filling -> I had to travel partially offroad to get to the Y-end station (wind gusts were causing a rapid accumulation of tumbleweeds) in order to manually open a pressure relief valve in order to correct.  CP7 overfilled as a result of the change in relationship between %open of the control valve and resulting liquid flow.  

Operator: expect CP7 alarms over the next 24 hours.


(X-mid)  The wind gusts increased significantly during the ~60 minutes that the X-mid (CP5) tank was being filled.  The rapid buildup of tumbleweeds along the X-arm effectively prevented the Praxair truck driver from being able to leave!  Luckily I was able to solicit the help of Hugh, Corey, Mitchell, Chris, Joe, Zack, Rodney and Ski who helped clear a path using pitchforks and walking in front of the truck the entire distance from the X-mid to the Corner Station!!!  

(Corey, Hugh, Mitchell, Rodney, Zach)

Today, we did the following:
* Top of the cleanroom was cleaned (it was not very dirty, since everything on top was newly-installed)
* Old Cleanroom roof/sock was removed
* Top of the BSC6 Dome was wiped down
* Big BSC6 cleanroom roof/sock was installed
* Made a fit check of the spreader bar on the BSC Dome lifting eyes.

To get access to the top of the cleanroom/BSC Dome, Mitch was attached to the crane via fall-arrest rigging.  To get to the top of the cleanroom, we needed to bring out the blue manlift.

Waiting for powers that be to sign-off on the BSC De-install Hazard Analysis/Procedure, and then we can proceed (as long as tumbleweeds don't prevent access to MY).

Disconnected PT210A, PT210B gage cables and BSC6 annulus pump power and signal cabling to facilitate BSC6 dome removal.  

Pressure indications from PT210 gauges are bogus until further notice.  

Doors remain off HAM12 and covers on, but no work occurred there today.
There's a work permit about moving a clean room at MY, which presumably happened.

10:10 Recycling pickup

1:15 south door of HAM 12 cloth removed, north door cover removed shortly after
~4:55 both doors of HAM 12 cloth covered
Scrubbing HAM 12 from 3:56 - 4:13, attached is trend of dust levels in the LVEA during this time
Location 1: Inside ISCT4
Location 2: Outside South West corner of clean room
Location 3: Inside North East corner of clean room
Location 4: Inside South East corner of clean room
Location 5: Inside "beer garden"
Location 7: Between HAM7 and HAM8
Location 8: Between HAM1 and HAM2
Location 10: Inside H1 PSL

~10:30 - Cleaning by ham7 

~11:00 - Ground Water in to sample water well

~2:30 – Both doors off HAM12

~3:00 – crew out to test new “scrubber” for in-vacuum cleaning.  Work continues by 4:00pm.

Kyle, Ski, Joe, Chris -> Removed HAM12 North and South doors.  This is the 1st time these doors have been removed since being baked out.  O-rings completely stuck like "glue" for entire contact area.  Much viton material "donated" from O-rings to compressing flange.

Jonathan, Patrick, Dave.

On Tue 7th we ported the advance ligo wiki service from the old iligo wiki machine (called wiki on the 10.2 network behind the ruby NAT router) to a new GC machine dedicated to the advligo wiki. The new machine is a centos linux, using ligo.org authentication. The new machine uses the lastest moinmoin version, whereas the old wiki had a very old copy of moinmoin.

The move required:
Copying the data content (2.9GB of files) and porting from old to new wiki format.
Transposing authors from the local accounts to the ligo.org equivalents
Automatically redirecting access to the old advligo URL to the new URL

The new wiki is at https://awiki.ligo-wa.caltech.edu

Questions, Comments, Problems should be emailed to wiki-help@ligo-wa.caltech.edu