Got the CPS racks grounded and wired up.  Fine tuned the Dial Indicators.  Still need to do some cable strain relief but I'm out of hardware and this is not the only place that is needed.

Ready for chamber cleaning to prep for opening.

I ran a few static tests yesterday on ETMY HEPI.  Things like linearity & range of motion etc.  Attached is a two plot of trends on the HEPI Cartesian basis IPS.  X & Y have moved a few ums while Z and Rx & Ry are pretty steady.  Rz has rotated a little more now out to 22urads.  Again this is good for the alignment now as long as it doesn't go further.

Dave, Stefan

We tried a PRX length measurement, but had to conclude that
- REFL is swamped with the direct reflection signal - the expected broad bump is not visible.
- POP has too much attenuation - he do not see a beat note at all.

The interferometer is thus available for the rest of the night.

All actuator sub assemblies have been completed. Time with Jim is required to add these sub assemblies to the ISI. All of the flexure sub assemblies 0-1, and 1-2 have been completed. The granite table has been cleared in preparation for monolithic plates, which were brought over to the staging building this afternoon by Apollo. 

Clean-up of RGA is slow at the reduced temperatures used -> RGA is isolated from the BT via (2) series-connected closed 1 1/2" valves

6:20 -> Working at End X – Jodi
7:20-8:10 -> Heading to End Y – Jodi
8:45-9:10 Going to End Y to work on dust monitor – Jeff.B
9:01-11:54 HEPI work on HAM5 - Hugh
9:15-9:30 Dust monitor work by HAM5 (LVEA) – Jeff.B
9:24-     Going to End Y – Travis
9:30-10:00 End Y cleaning - Karen
9:35 -> PSL Check List (OK)
10:16-13:39 H2 Laser enclosure work – Gerardo
10:38-11:04 Working on SR3 (LVEA) – Jeff B.
10:43-11:30 Searching for cables at Mid Y – Filiberto
10:45-12:35 Going to End X (cleaning) - Cris  
11:20 -> Laser turned ON at End Y – Rick S.
11:30 -> LVEA transitioned to Laser Hazard - Justin    
13:20-14:30 Back to HAM 5 – Hugh
13:30-  Working at End X – Keita
13:58-  Joining Keita at End X – Sheila
14:08-  In LVEA working on nitrogen piping - Apollo 

Travis, Margot, and Kate

Removed the horizontal 4" wafer from the beamtube (between the purge air port and ACB). The 1" optic that was placed with the wafer couldn't be removed (no PETG containers available), so it was moved to the opposite tube for the time being. When possible, it should be moved back to its original location or removed. A new 1" optic (s/n 1195) was mounted vertically to the QUAD.

Refer to Betsy's earlier alogs on contamination in BSC10 (10522, 10675 & 10686). There is still a lot of particulate contamination, even after cleaning. The first photo shows a wipe used to clean the tube on Monday. Dust, metal, a few red fibers, and white fuzzies were observed on the tube floor from the ACB all the way to the PCAL periscope. The iphone photos and videos don't really do it justice. There was a much higher concentration of white fuzzies along one half of the tube (on the right side, if you have your back to the ACB and are facing the periscope). Travis took an FBI sample, and then vacuumed the area.

We've had at least 6 times this morning that HEPIs have tripped on the L4Cs, and there isn't a clear reason looking at the seismic conditions why today should be worse than other days.  The chambers that have tripped are (at least ) IMTX twice, ITMY once, HAM2 once, BS twice.  Attached are plots of the two most recent BS trips. 

No one on site really has the time to sort through the data and figure out what is happening, is there anyone from SEI or DetChar that can take a look?

Thank you,

Sheila

Dust monitor #2 at End-Y (next to the BSC10 chamber) and dust monitor #1 in the HMA5 cleanroom are both online and functional. 

It didn't seem like there was much seismic noise based on the PEM FOMs, but they both triped around the same time.  Plots for ITMX attached

2014_03_13 16:14 h1ioppemmy

2014_03_13 16:15 h1ioppemmy

2014_03_13 16:18 h1ioppemmy

2014_03_13 16:22 h1ioppemmy

2014_03_13 16:48 h1ioppemmy

2014_03_13 16:50 h1pemmy

no unexpected restarts.

Laser Status: 
SysStat is good
Output power is 28.4 W (should be around 30 W)
FRONTEND WATCH is Active
HPO WATCH is red

PMC:
It has been locked 2 d, 11 h 15 minutes (should be days/weeks)
Reflected power is 1.2 Watts  and PowerSum = 11.3 Watts.
(Reflected Power should be <= 10% of PowerSum)

FSS:
It has been locked for 0 d 0 h and 5 min (should be days/weeks)
Threshold on transmitted photo-detector PD = 0.9 V (should be 0.9V)

ISS:
The diffracted power is around 13.4 % (should be 5-15%)
Last saturation event was 2 d, 11 h and 15 minutes ago (should be days/weeks)

Chris ran the swiffer in the Diode Room this morning for the first time in 8 months. Will try to make cleaning more regular.

Earlier tonight Alexa made some measurements of IMC transfer functions to for matching with her model, and I worked on the slow feedback to the ETM top mass. (alog about that coming in the morning, in short the L2P decoupling has helped)

Now I've made some measurements similar to what ALexa and I did on Monday night (alog 10668) of the linear coupling from the test mass angles to the out of loop frequency noise sensor (the normalized refl PDH).  This time I dithered the PZTs on ISCEX, and measured the spectrum of the normalized PDH and the green QPDs on the input beam on the TMS table.  I haven't calibrated the QPDs, or measured the loop gain, but these are verry slow loops and I dither the PZTs at 5Hz so that should not matter. By dithering each PZT in both pitch and yaw, and finding the peak in the spectrum of both QPDs each time, we get 2 measurements of the coupling from each QPD to frequency noise.

As you can see the measurements made with different PZTs aren't always consistent.  Using these and measured spectra of the QPDs, we can make the projection of the linearly coupled  noise from input beam pointing to ALS frequency noise, it is not a significant contribution (below 100Hz) based on any of these measurements. At around 100 Hz these projections seem to explain the noise, I believe this is just the noise of the QPDs, but will check in the morning. 

I also checked the linear coupling from the ETM pitch to frequency noise, to see how much it changes with alignment. I measured 424Hz/urad, moved the ETM by 0.1urad, measured 1.12kHz/urad, tried to move it back to the original spot and measured 2.03kHz/urad.  Then I tweaked up both pitch and yaw on the ITM and ETM to try to maximize the green transmission, and got 3.2kHz/urad. So we can change the linear coupling by adjusting the alingment; by hand I only seem to make it worse but hopefully the WFS will do better.

I am leaving the green arm locked, and the guardian running the ALS COMM handoff, so hopefully the IR will be resonanting in the arm some part of the night.

Offending Y2P peak between 1 and 2Hz (pink) was removed after a new decoupling filter was put in place (green).

In the H1:SUS-ETMX_L2_DRIVEALIGN_Y2P filter, I put the same invP2P filter in FM1 as in the P2P path, then added a diagonalization filter ("Y2Pdiag") in FM2, and another filter that is a 3rd order elliptic BP in FM3. I didn't try to remove 0.4-0.5Hz Y2P peak, it's not great but probably good enough.