Adhered temp recorder to Y2 BT -> Dumped unpumped volume seen be PT246 dead space into RGA assembly at port Y2-1 -> Isolated turbo pump from RGA -> Opened 10" gate valve -> Energized PT246B (eventually had to "tap" lightly with wrench to get gauge to fire) -> RGA scanning in Faraday MID, amus 2,5,14 and 28 -> will isolate Y2 BT from ion pump tomorrow by hard-closing GV11 and GV18  

This exercise is part of the Y2 pressure accumulation data collection 

8:00 Work on Genie and Forklift behind the Highbay – Mid Columbia Forklift
9:13- 11:38 Heading to HAM6 to continue on ISI work – Hugh
9:22- AA-AI Chassis modifications for ISC in Electronics room – Filiberto/Aaron
9:28- Going to EndX to grab some parts to work on HAM6 – Corey
10:00-12:11 Baffle work in LVEA (West bay) – Gerardo/Scott
10:30-Heading into HAM6 to do some testing – Corey/Keita
13:00- Back into LVEA   (West bay)  for more Baffle work– Gerardo/Scott
13:13- Installing SUS Watchdog chassis and running cable at EndY – Filiberto/Aaron
13:51- Dump unpumped volume seen by PT246 into RGA turbo*isolated turbo from RGA*open 10" BT valve thus exposing RGA and PT246 to BT* Begin scanning at MidY/EndY – Kyle
13:55- 14:45 Heading back to HAM6 to continue on ISI work – Hugh
14:07- De-install receiver pylon for PCAL welding at EndX VEA – Thomas
14:15- Heading into the LVEA to relocate dust monitor – Jeff B.
14:35-Going into the H2 PSL enclosure – Peter
14:54 SPRAGUE on site.
15:00 EX VEA transitioned to laser SAFE

I'll attempt unlocking and continue with balancing the ISI later when Keita & Corey are not working there.

PSL is down today.

Laser Status: 
SysStat: “Frontend lid open” and warning “Service mode” are red
Output power is 0 W (should be around 30 W)
FRONTEND WATCH is Red
HPO WATCH is red

PMC:
It has been locked 0 days,  hr 0 minutes (should be days/weeks)0
Reflected power is 0 Watts and PowerSum = 0 Watts.
(Reflected Power should be <= 10% of PowerSum)

FSS:
It has been locked for 0 d 0 h and 0 min (should be days/weeks)
Threshold on transmitted photo-detector PD = 0 V (should be 0.9V)

ISS:
The diffracted power is around 0.6 % (should be 5-15%) 

The core swtich is low on memory, looks like it started on May 1 (this year).  In theory we're not doing anything to require a large amount of memory, that probably means the possibility of a memory leak though so far it's not clear what process is responsible.  I'll be able to do more to confirm this tomorrow when I can reboot it as part of other planned maintenance.

As part of the roll out of the new epics alarm cell phone alert system I have powered down the old service machine (sugarloaf).

no restarts reported.

Fred, Aaron, Gerardo, Jeff B, Bubba, Travis, Hugh, Mike, Thomas, Corey, Peter, Rick, Jodi, Jason, Patrick, Dale, Justin, Thomas, Arnaud, etc.


•	More preparations for  ITMy deinstallation – Travis
•	Clean room work in LVEA - Apollo
•	Monolithic lower structure assembly ready to be hoisted onto the arm and reinstall it in-chamber (Not today) – Betsy/Travis
•	More ISI work on HAM6 – Hugh
•	Contamination and Control activity in LVEA – Jeff B.
•	AA-AI Chassis modifications in Electronics room – Filiberto/Aaron
•	Pulling RGA gate valve by HAM3 (East door) - Kyle
•	Staging building activities ongoing – Mitchell/Scott

I rebuilt the sysadmin login machine cdslogin with U12.04LTS and installed a minimal python/epics to run my epics_alarm_texter.py code (sends EPICS alerts to cell phones). Previously I was running this code for testing from sysadmin0. The plan is to test on cdslogin over the weekend, and then retire the old code which is running on sugarloaf (which permits removal of the computer rack from the Computer Users Room).

No restarts reported.

  For the past few months we have been suffering from an unwanted stage 1 Z to stage 1 rZ coupling (the attached plot Z to Z Subtraction shows an example).  It seems to have two component which show up in the T240 rZ signal.

   There is a 1/f^2 component (in Force to displacement units, the plot is in force to velocity) and a flat component (again in Force to displacement)

   The 1/f^2 part does not seem to represent center of mass motion of the platform, as shown by the optical levers (the black line in the Z to OpLev Yaw plot), it is not clear

for the flat component yet.

   Speculation for the 1/f^2 has centered on magnetic coupling or local deformation of stage 1, current measurements and FEA on these two effects are off by about the same amount.

   Since we believe that the signal is not CoM motion we are going to subtract it from the T240 rZ signal.  The plot Z to Z Subtraction shows the predicted amount of subtraction based on the fitted filter.

where the red line is (TF - FIlter)/TF so we are hoping to get a factor of~ 50 subtraction.

    The plot Z to OpLev Yaw  shows some results.

  The BLUE lines shows the transfer function from ISI stage 1 Z drive to the optical lever (solid line is yaw, dotted it pitch) while the ISI is in high blend with no T240 in the control path. So we expect to see

any mechanical coupling. 

   The PURPLE lines shows the same transfer function with the stage 1 of the ISI in low blend (~40mHz) and the T240s in the loop. Whatever extra pickup exists in the rZ T240 signal will be imposed onto the motion of the ISI

and show up in the optical lever signal (pitch as well as yaw because the suspension is not at the center of the ISI table and there is a translation to pitch coupling).

   The Black lines are the same transfer functions with the subtraction path enabled (i'm not even going to try and explain how we got 3 orders of magnitude of suppression)

   One disclaimer I calculated a filter gain of 3 and ended up using a gain of 3.24

Per bugzilla integration issue 463, looked at AA/AI chassis to verify units have the proper insulating film used to isolate the -15V regulators to the chassis metal wall. 

All SUS AA/AI chassis in the CER have been modified or verified to have the appropriate insulating film.

S1100318 S1105214 S1105311 S1105301 S1105305 S1200297 S1200299 S1200300 S1200301 S1200281 S1200298 S1202115 S1202091 S1202111 S1202112 S1202113 S1202114 S1202110 S1100323 S1100334 S1100322 S1105310 S1105304 S1105302 S1105303 S1100324 S1104376 S1100319 S1107602 S1105298 S1105307 S1104366 S1103817 S1104353 S1202535 S1202538 S1202534 S1202607 S1202608 S1202606 S1202613 S1103953 S1103952 S1105308 S1105309 S1105297 S1202537 S1202536 S1202533 S1202539 S1202540

All SEI AA/AI chassis in the CER have been modified or verified to have appropriate insulating film.

S1203356 S1203357 S1203131 S1203329 S1203133 S1203036 S1202072 S1202073 S1202069 S1202074 S1202075 S1202068 S1202070 S1202071 S1203361 S1203359 S1203134 S1203358 S1203360 S1203135 S1203330 S1203331 S1203108 S1203098 S1203099 S1203144 S1203033 S1203268 S1203103 S1203104 S1203105 S1203332 S1203136 S0900066 S1300137 S1300133 S1300134 S1300141 S1300143 S1300610

Both SUS and SEI electronics have been reconnected and powered up. All units were placed back in appropriate rack and slot location.

Will need to coordinate with Keita when we can do the ISC AA/AI electronics in the CER and LVEA racks without interfering with HAM6 work.

All AA/AI electronics in both end stations still need to be verified sometime next week.

Per L1200193 connected grounding plugs to all SUS coil drivers in the CER. The plug is attached to the DB9 connector labeled Test Input.

All tip-tilts (OM1, OM2 and OM3) are free, BOSEMs centered, and the eddy current damper anywhere from 0.8 to 1.5mm. Some of the tiny tiny set screws to fix the back eddy current dampers are completely loose, so they were tightened.

M4 (the mirror behind OM1) needed to be pushed about 2" toward east from nominal position specified in https://dcc.ligo.org/D1000342, it was physically impossible to go very close to tip tilt because the cable connector sticks out to the back. Not a big deal.

M8 (a small mirror by OM3 to receive OMC REFL light) was flipped, as the AR coating and the peek ring were facing the OMC.

I found that LLO did the OMC REFL beam diverters (BDV2) better than what was reported yesterday by me, i.e. their peek washers are behind the black glass, though the aluminum will cut the beam first when the thing engages. I decided that their way is better than pontentially burning PEEK and making a nice PEEK coating on OMC, and copied their configuration.

Total of four V beam dumps were installed, one behind OM2, one by the OMCS, one on the QPD sled to receive reflection of BDV2 and one near OM1 to receive reflection of BDV1. The latter 2 are not on the drawing and I simply copied the way it was done at LLO.

All BOSEMs including the tip tilts and OMCS were centered, and they're working fine.

All segments of all QPDs (OMC REFL sled, AS_C QPD, and OMC QPDs) and WFS DC responded to flash light.

Both of the OMC DC PDs responded to flash light.

Cables are tied down to the ISI surface using peek cable clamps.

The only thing remaining is the electronics testing of picomotors, OMC PZD, and beam diverters.

I took some pictures (but I'll let Corey take a better ones later).

Still have 16 10Kg masses to load onto the table both + & - X area.

3IFO #3 is being tested now.  #4 Optical Table is assembled and will go onto Stage0 Monday.

Mitchell Scott & Jim

• Apollo working at EY (cleanroom work)
• Hugh heading to HAM6 to lay out more SEI Payload Masses
• HAM4/5 SEI being shut down (Filiberto)
• Looking for laser enclosure keys at EX...maybe EY (Justin)
• ISC Crew assembling at HAM6
• Karen cleaning EY
• HAM2/3 seismic rack being turned off at 11am (Aaron)
• HAM1/6 seismic racks turned off at 12:30pm (aaron)
• Peter heading out to ISS room
• BSC3 ISI investigating:  Jim looking for anything lose on the assembly
• Cyrus out to EY to turn on a computer & also to the LVEA later
• Apollo working on cleanroom in LVEA
• Dale took Big Bend Comm College class on tour in LVEA

All optics except two steering mirrors (one behind OM1 and one close to OM1) were fixed down to the nominal position. We need to move these two steering mirrors tomorrow.

Two V beam dumps are to be installed tomorrow.

OMC was freed, OMCS BOSEMs were centered.

OM1 was freed, OM1 BOSEMs were centered.

OM2 and OM3 are going to be freed and BOSEM centered tomorrow. Damping magnet gap for all Tiptilts are to be set tomorrow.

All 5 QPDs, WFS(DC) and OMCDCPD will be tested tomorrow.

Detailed alog will follow.