- Interwest Communications (?) comes to assist in running single-mode fiber optic line from OSB MSR to LSB LDAS.
- Oscar finishes baling tumbleweeds at ~13:20.
- Bolts loosened on BSC7
- Cleaning around BSC7 and HAM12
- Cryopump 1 is constantly alarming.  Kyle reports that it may be due to a crow chewing on a valve and subsequent freezing of the part.  Cryopump alarms are serious!  Whereas some Ion Pump alarms may be ignored during pumping, Cryopump alarms are always serious and should be reported immediately, to Kyle.
- One of the LVEA Zone 5 thermostats was malfunctioning, as it was reporting that the temperature jumped to >250 degrees F.  This was also confusing the HVAC servos.  Ski investigated and fixed the problem.

CP1 and CP2 experiencing problems with icing of the LLCV actuation components -> thawed using heat gun as temporary fix.  Will address as permanent fix as time permits.

Kyle - Connected aux. pump cart to GV7 annulus and am pumping against closed valve*Spun-up XBM MTP*Vented XBM

Chris - prepped BSC7 east door for removal tomorrow

(Chris, Corey, Jim, Rodney, & Zach)

In preparation for this week's BSC7 iLIGO BSC SEI extraction, the Dome & Door bolts were pulled out of BSC7 (except for four for each connection).

John asked to check the orientation of the BSC Dome once we have bolts out (there were issues with the O-ring when this Dome was last installed).  From the top and referencing bolt holes, the Dome is roughly rotated counter-clockwise.  A side note is that the outer diameters of both flanges on this connection must have not had high tolerances, because these diameters aren't very circular---i.e. sections of Dome flange overhung the Chamber flange in non-circular ways.

As with BSC8, the Scissors Tables for the chamber were set to their midpoints and Scissors Table Stop Links were installed to keep them there.

Jim's pair of fall-arrest plates were installed on the Clean Room.

The aLOG will be updated tomorrow.  This update will include the addition of a WYSIWYG editor, so you will be able to easily format your entries.

The LHO alog (alog.ligo-wa.caltech.edu/aLOG/) will be inaccessible for 5-30min on 11 Jan 2011 starting at 8:15 Pacific time.

The LLO alog will also be updated on 11 Jan 2011.  The GC admins at LLO will coordinate the time of that update.

A copy of this notice will be entered into the aLOG.

I can log onto blue remotely but can't view the vacuum screen displayed on VE terminal in control room???  

(Corey, Hugh, Jim, Mitchell)
The Scissors Tables (and basically the entire Seismic Isolation System) were vertically adjusted such that the Scissors Tables were set to their "mid-point" elevations.  Shipping/Llot Links were installed to hold the Scissors Tables here (as we did for the H2 HAMs).  The Scissors Tables were actuated manually via a rod attached to a motor underneath the Scissors Table.  We needed a special key-ed tool to turn the crank and actuate the Scissors table.

We will do BSC7 next time we get a chance.

Sock replaced on BSC7
KingSoft water on site for monthly service
Terri and Christina cleaned BSC7 and performed vacuum tests - we will need more tests next week
Richard to MX and EX

Highlights:
- HAM10 Door Re-Hung, Cleanroom moved to HAM12, doors taken off of HAM12
- Kyle notices LN2 issue

Other, times in PST:
0926 - "QMA" calls Control Room to solicit business
1032 - CS Air Handler Hot Deck Alarm (~90deg F)
1421 - Oscar done with tumbleweed bailing

Kyle, Chris, Jodi, Zak, Rodney, Ski -> 

Hung HAM10 North door, moved cleanroom from HAM10 to HAM12, removed HAM12 South and North doors. 

Mark Barton ran transfer functions for Main Chain and the results are within spec. 

Today we made the following changes to the Reaction Chain: 
(1). Restored the 50g trim masses on the UI mass Top Plate to the design configuration.  
(2). Removed all the addable mass from the UI turrets. The combined weight of the Reaction Chain additional mass and mounting hardware was 563g. To equalize the Reaction UI mass to the Main Chain UI mass, we removed 525g of addable mass, leaving 38g of additional mass. This mass was distributed symmetrically about the top and bottom turrets. 
(3). Reset the UI blade tips to 15mm.
  Note: We replaced one of the blade clamp bolts due to damage to bolt head.
(4). Adjusted the pitch of both chains.
(5). Reset the BOSEMs on the Top Mass to mid-light position. 

Reaction Chain is sitting at 21mm above the LS. Mark will run the transfer functions on the Reaction Chain. 

~1100 hrs. local. 
Noticed LN2 boil-off vapor eminating from backside of CP1 dewar piping (i.e. not normal location) -> Investigation revealed the following: Indicated dewar head pressure @ 42 psi (nominal is < 20 psi).  The transfer line pressure relief valve was popped open and LN2 was being released onto the ground.  Found that the dewar pressure relief circuit was closed (manual valve was closed).  Also, the LLCV needle was fully closed even though CDS indicated needle was 20% open. -> I opened the deware pressure relief valve to vent the dewar head pressure through the economizer valve (i.e. returned to normal configuration).  I switched CP1 LLCV from PID to manual control @ 50% open and confirmed that LLCV would stroke open and closed with the instrument air valved in and out etc..  I then returned control back to PID and confirmed that the CDS output corresponding to 20% open really corresponds to the valve being 0% open.  

Conclusion:  The Praxair driver had likely closed the dewar head pressure relief (manual isolation valve) for some reason??? while filling on Tuesday and forgot to open it before leaving.  This would cause the head pressure to begin increasing.  The %open output of the CDS PID loop would then begin to ramp closed  Eventually, the LLCV would be closed.  Now the total pressure, head pressure + weight of liquid column, would increase until the transfer line pressure relief valve popped open.  It will take a day or two for the head pressure to get back to < 20 psi venting only through the economizer circuit.  The normal pump level swings will likely result due to the "warm" portion of the transfer line piping once the LLCV actually starts to open.  

Door Access Alarms
09:15am - Large equipment access door alarm. Dani reports the sensor that reads the status of the door ist kaput.  

Major Activities:
~10:30 - removal of HAM10 north door	
12:05 - removal of HAM10 passive stack
done by ~3:30

No other work in the LVEA today.

(Carolyn P., Corey G., Jodi F., Joe D., Justin B., Mitchell R., Rodney, Zach)

Once the north door for HAM10 was removed, an SEI crew began work for removing HAM SEI hardware.  This was similar to the HAM7-9 work, but For this task, we were required to keep all the hardware clean, and store it (for later re-use).

This work went very smoothly (the duration of the job was around ~3hrs).  All of the hardware is being stored in the north bay of the LVEA (see photo).  A note about the big stuff:

Optics Table is resting on one pallet.  If it needs to be moved, one will either need to basket the Table with straps and use the crane (or one will need to re-attach the Optics Table Hoist Plate and the forklift).  

For the Leg Elements (masses), we foiled one of each mass, and put both of them in an Ameristat bag (so we four stacks of masses on a pallet).  So, it should be noted that these two masses are "loosely" packed in their bags---so be careful, if these ever need to be crated over the beam tube.

All of the small stuff (washers, springs, screws, etc.) are bagged and resting on top of the Optics Table.

Yesterday 01/04/11, we removed 425g of addable mass from the Main Chain UI mass on Quad 2. The remaining addable mass (114g on the top and bottom Turrets, total 228g) was placed to reestablish symmetry on the UI. The Quad is now sitting at 20.5mm above the LS frame. The Quad has been rebalanced and aligned. Mark Barton is running transfer functions.        

Nothing major today. Toyota forklift moved out of the high bay and craned over the beam tube. Cyrus working on phone systems at the end stations.

No major work today. We were also expecting several large deliveries for SEI (Hugh, to go to the warehouse) but none of them arrived today.

Ice accumulation on exposed portion of LLCV needle valve needle not applicable to CP2's recent misbehaviour.  Instead, the pneumatic actuator box required thawing via the heat gun.  As found, the needle was stuck in it's nominal position (~15% open) and wouldn't stroke when >nominal open settings were selected (in manual control mode) or stroke closed with the instrument air valved out.  With the actuator thawed, now the needle strokes freely through 0-100% settings.  

CP1 is working at this time but was probably experiencing a similar problem yesterday.

Probably ice accumulation on exposed portion of LLCV needle valve preventing valve from stroking closed (or not).  I'll be in today anyway for unrelated reason.  I'll investigate CP1 and CP2.

CP1 and CP2 (corner station) "out-of-whack" for some reason. Am monitoring from home.