We went into HAM 12 today for the purpose of trying out the modifications to the rotary tool and funnel for collecting freon samples. (We were also hoping to take some more "legitimate" freon samples today but sample bottles did not arrive.) 

Report on rotary tool:
1. Housing modifications (housing was split down the middle) worked well: the housing was easy to take apart/put together and speed could be changed without dis-assembly.
2. Stem (replaced the chuck) worked very well.
3. Fabric sock needs work: still did not allow enough "play".
4. Vertical brushing does not seem to generate as much particulate as horizontal brushing.
5. Cup brush lost a bristle today.
6. Current bush does not allow tool to be used to clean close to "fins".

Report on funnel:
1. Horizontal orientation seems easier to use.
2. Radius of curvature on the rear wall of the funnel allowed closer contact with chamber wall.
3. Handle allowed pressure to be applied to increase contact between chamber and funnel wall.
4. Thinner metal seemed to make a difference as well.
5. We collected ~80% of the freon that we poured in the trial run.
6. We are likely to add a valve to allow collection in chamber but recovery in the staging area.

Misc.
1. We tried brushing near a "fin" with a stainless toothbrush which cleaned the chamber wall effectively but generated high particle counts.
2. We ran the external purge air unit with the output ducted to a HEPA filter.

I will post some official report on the DCC that includes pix.

Kyle, Zack, Rodney->Hung BSC6 South door.  

Kyle->Torqued BSC6 South door bolts, pumped BSC6 volume down to 0.5 torr then valved-out pump (for overnight).

Note: Inner O-ring on spool connected to GV10 leaks into annulus.  Thus, while BSC6 volume remained vented an aux. pump cart was used to prevent the GV10 annulus ion pump from becomming overwhelmed.  "Roughing" out the BSC6 volume will allow the removal of the aux. pump cart from the GV10 annulus piping. This is a "safer" configuration for Y1 during the Holiday break.  

Note: PT210 gauge pair (mounted on BSC6 dome) are not connected to CDS system.  Any pressure indication for these is "bogus".

Today's main tasks:


 BSC6 Cleanup
 HAM12 Cleaning Tests


Other items to be documented by their task leaders.

BSC6 stack at MY was disassembled.

There will be a small amount of maintenance on the aLOG tomorrow.  This is an upgrade to some auth project (LIGO.ORG) infrastructure.

The work will take place at 10am pacific time.  Please finalize your entries or save them as a draft.  The update should be complete in a matter of minutes.

Thank you for your patience.

Attached are X and PIT TFs of the QUAD with the UIM blade tips deflected an additional 3mm lower than nominal.

Rebooted h2adcumy PEM crate.  The system was running but out of sync with the world so I rebooted the front end this morning.  Channels all seem to have returned. Most likely cause was work going on at MY Friday.

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.

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