Noisy morning work (until noon) & then quiet for OAT afterward.

• Remove HAM3 Arm
• Lots of Doors installing:  Only insalled HAM3 East door before lunch stand-down time
• HAM ISI work in cleanroom
• Baffling work
• Robert/maggie moving coils at EY---done around 1pm
• H1 PSL to High Power (Michael and David) Most of the day
• Fire Dept snuck on-site
• Brahm at EY at lunch---checking green optics
• Betsy, Callum and crew wandering around HAM2/3...asked about turning on a vacuum (in-chamber cleaning?)
• 2:15 Rick tour
• 2:30 Cheryl off to EY TMS lab
• 3:27  tour on roof Filiberto
• 4:10 Patrick near HAM2/3 for Dust Monitor

noon:  quiet time begins!!

The high power stage was turned on for faraday isolator work. The PMC and FSS are locked, the ISS is unlocked while work is ongoing in the room.

The ILS had some trouble locking, but after raising the reference level to -1.2V from -1.4V it was able to continuously hold lock. The phase of the PMC LO was moved from 67 to 276. The PMC mode matching lenses were moved to the following positions:

L2

Old position (35W) - 368mm, 10.78mm on vernier

New position (200W) - 310mm, 10.78mm on vernier

L3

Old position (35W) - 738mm, 4.10mm on vernier

New position (200W) - 728mm, 4.10 on vernier

Position was measured on the north edge (towards HAM1) of the lens block that mounted onto the rail.

After correcting for alignment we had 126W transmitted and 30W reflected. I did not try to correct for mode matching losses, I only moved the lenses into their original positions, before we moved them to mode match the 35W laser.

The PMC ref level was changed to 1.22V from 1.11V.

The high power stage will stay on overnight but will be turned off for the weekend. I will take some DBB plots tomorrow and give everything some more time to warm up.

(Jax, Elli)  At 13:59:25 local time (20:59:25 UTC) 630mA was requested from each segement of the ITM. Cavity scans are being recorded.  We'll turn the ITM ring heater off after 3 hours.

Running the ring heater is affecting the alignment of the cavity a lot, I'm having to increase the pitch offset on the ITM by about 25 counts every 2 minutes.  Wavefront sensors are on.

35W beam

We installed the compression rings on both A and B ends of the Mode Cleaner Tube (MC2) between HAM4 and HAM5. We completed assembly of all four of the Viewport Frame sections (2 per baffle). We attempted to attach the frames to the compression ring brackets and had difficulty. Screws were meeting resistance at three locations, one per frame. To prevent galling and particulate generation, we removed three of the four frames from the tube. One frame was successfully installed at MC2 A. The plan is to evaluate the #10-32 screws and tapped holes tomorrow morning.

Lisa C. Austin, Thomas Vo, Nichole Washington and Scott (of Apollo).

[Giacomo, Deepak]

After spending Monday collecting (chasing?) missing parts and Tuesday installing helicoils, today we were able to start (and finish!) some real assembly work. In particular we assembled:
- 6 HAUX towers, complete of almost all accessories
- 12 pairs of blades supports (including blades already paired for each suspension)
- 6 optic holders (excluding the magnets retro-fits)

We encountered virtually no problem. The quality of the attached picture is bad, but should be good enough to show the progress.

Tomorrow we will likely spend some time re-applying FC to the optics; then we'll proceed to the final steps of the assembly.

I'll refrain from optimistic forecasts about the completion of the job... :-)

[Alberto, Adam, Bram]

We locked the arm, with a jumpy RefCav. Starting time 21:04 local time, 22 August 2012.

The ETMY has the super sensor with the STS seismometer.

We did various WFS matirx measurements, came up with a matrix ... it looks wrong but seems to work. I set limits on the pit and yaw feedback signal and left them engaged for the night.

It is late, so more details later.

Attached are plots of dust counts > .5 microns in particles per cubic foot.

This morning we noticed that the magnetic rotator is not in full contact with its mount. Cheryl identified the problem as due to the fact that the thru-holes drilled in the restraining Omega-shaped rings are not well matched to the corresponding screw-holes in the mount. I gave her the restraining rings for adjustment.

This means that the magnetic rotator is not secured in its mount at the moment. I will not be placing any optics (TGGs and Quartz) inside the magnet until it is secured (required for steps 20-on of the procedure in E0900301).

I have gone through steps 1 thru 19 of E0900301 (at low powers only).

Steps 16-17, s-pol extinction by the 1st Calcite Wedge Polarizor:

Step 19, s-pol extinction by both CWPs:

Some more adjustment is needed to get to the required extinction of 50 dB.

Electronics were troubleshooted.

SEI and SUS models were arranged to allow un-tripping HAM2-ISI Payload Watchdogs.

HAM2 model was re-compiled, installed and re-started after that. It is now running.

Matrices were filled

Input and output filters are loaded

The latest version (Version_2) of the unit-specific control scripts were copied from LASTI. They were made ready for use on HAM2. 

Spectra were taken on the ISI tilted. It is the worse configuration for GS13s and they all appear to be working fine (see attached plot).

Transfer function measurements are running overnight.

• Cheryl and David F in the PSL working on the faraday
• Dave restarted models at EY
• Work on HAM3 (SUS/SEI) and HAM4 (baffle installation)
• GV5 was closed for Robert to remove viewport cover to check oplev beam, he is currently opening it

I have implemented the sensor correction at HEPI-BSC6. Sensor correction improves the isolation performances of the HEPI in the X, Y and Z directions. In attachment, spectra of the L4C installed in the HEPI boots are presented in different configurations:

• No isolation (blue)
• Isolation without sensor correction (green)
• Isolation with sensor correction (red)

JimW CoreyG HughR

With IAS signing off on position yesterday, we did a final check on elevation/leveling and did need to make some vertical adjustments.

We ended up with the Optical Table 0.1mm high at -240.3mm and level to 100urad (+-0.1mm)

These vertical adjustments barely moved the system horizontally--based on Dial Indicators the sw & se corners moved 1 & 2 mils (<0.05mm).

So we have locked up the HEPI and are now doing ISI measurements.  We will continue with ISI testing, then attached HEPI Actuators, followed by a post install (actuators) IAS check if dial indicator readings suggest it is warranted.

Attached is the surveying and dial indicator readings logbook page.

Filiberto, Richard, Michael R

The PSL was moved off of the temporary power supplies for 24, 18 and 12V and is now running on the DC power supplies in the H1 electronics room. For the moment, we are still running on the temporary power supplies for high voltage (400V for PMC/ILS, and 180V for FSS), however they were moved into the PSL rack to free up room. The purple cables in the electronics room were redressed as well.

The PSL servos and laser were shutdown for this work, and the key from the control box was removed to make the laser and ante room laser safe (to make David Feldbaums work easier). I plan on turning the laser on tomorrow morning, so it will be off for the night. If all goes well with David's work we may go to high power tomorrow as well.