Attached are the trend plots for the three dust cameras 3, 4, & 11.  Dust Monitor 3 and 4 were located in the clean room over the ISI/Quad Test stand. Dust Monitor 11 was located between the aforementioned clean room and the clean room over HAM 12 where ICC were using drills throughout the day.  The plots are intended to look for any high dust counts that could connect monitor 11 to 3 and 4.  This would indicate the effectiveness of the anti-contamination mechanisms which are put in place to prevent particles from affecting the ITM, such as the HEPA filters over the ISI and the filter on the various drills which are used for ICC.

Note: 11 seemed to be malfunctioning at approximately 22:30 or so but was fixed about an hour later by Patrick T. Also, the ICC team did not use drills today so it's interesting to see what exactly could cause high particle counts throughout the day as well as compare the graphs to the 11/10/2011 graphs to see if the maximum counts were higher with the drills.  It's also good to know that the crane and the forklift were used throughout the day near the two clean rooms.

The biggest spike of the day near the Test stand occurred around 22:00 and at the same time 11 also had a pretty big spike and so it begs the question to see whether or not they are related.  It'd be good to see if anyone could recall what they were doing around that time so that we can pinpoint what could cause this spike in dust counts.  I was told by the SUS team that movement around the monitors could have caused this spike but it's interesting that around that time there was a big spike outside of the clean room as well.

Attached are plots of the M0 WhiteNoise transfer functions for the six Euler DoFs.  All measurements are with 0.01Hz resolution with 15 avgs.  Exported data will be compared with matlab models and previous measurements.

Mark Barton created a Mathematica utility which pointed us in the direction of the UIM wire clamp locations on the mass as being a culprit in our asymmetric UIM mass.  I'll let him add the details of the cool model to the alog, but steal the nutshell for monolithic sake:

One thing that leapt to our attention is how sensitive the pitch is to the uimfixedfwdmm slider.  That means if the triple hang tooling bolts to the UIM in a slightly different place than the real clamps, there could be major discrepancies. 0.1 mm there is good for 14 mrad at the UIM, 7 mrad at the PUM and 5 mrad at the TM, which is rather more like what we're seeing than any prism or ear perturbation. 
-M. Barton

So, this afternoon we unclamped the triple hang tooling wire clamps and played with them in the mating grooves on the UIM.  We even switched the "right" segment for the "left" and then rehung the monolithic in the triple again.  We made no adjustments to the monolithic/UIM suspension itself.  This time, the pointing of the masses was slightly different than the morning measurements, indicating that in fact there is too large a range in something related to the triple hang tooling wire segments to get reproducible pointing.  (Note, the differentials clock together in magnitude as expected, they are in a different range than before.  From Jason's notes:

    UIM: ~1.739 mrad down
    PUM: ~0.505 mrad up
    ITM: ~2.677 mrad up

    UIM/PUM Differential: ~2.244 mrad
    PUM/ITM Differential: ~2.172 mrad

Note, we have not been able to reproduce the 5mRad differential UIM/PUM pitch noted last week, which has since gone awol.

After the weekend, we thought it prudent to recheck the pointing on the triple monolithic suspension.  Nothing was adjusted over the weekend, so it was a good chance to look for drift, slip, settling, etc if there was any.  In fact, the pointing were effectively unchanged (compare to my Fri alog entry).  From Jason regarding this initial Monday morning measurement:

UIM: ~5.217 mrad up    
PUM: ~4.457 mrad up
ITM: ~5.835 mrad up


One comment on the UIM pitch measurement: this is being done with an optical level with 115mm between the front and back points on the UIM.  The smallest increment I can measure on the scale used for the measurement is 0.1mm.  Therefore the smallest angle that can be measured with this method is arcsin(.1/115) = 0.870 mrad.

There was a discussion (Dennis, John, Michael L., Bubba, myself) after morning meeting wrt how many post-work FTIR samples should be taken in this chamber. Since there are several questions related to the possible contamination in both HAM 11 and 12, we have asked the VRB to make a determination of what will be required to go forward. In the meantime, the crew finished the balance of the work in HAM 12 (with the exception of post-work FTIRs)and began replacing doors. One door went back on today and the other will go back on tomorrow. When the chamber is re-entered for FTIRs, it will be through the door blank at the west end.

Attached are plots of dust counts > .5 microns. The dust monitor at location 11 in the LVEA (between the clean room over HAM 12 and the clean room over the ISI/SUS test stand) had stopped for an unknown reason. I went out into the LVEA and it had been moved several feet. It seemed fine after I checked the settings and hit run. The dust monitor at LVEA location 6 (in the H1 PSL diode room) had a sensor alarm and was removed. It looks like it may have occurred around Nov. 13 2011, 21:40 UTC.

The high power laser and the premode cleaner locked stable over the weekend. Injection locking as well as the premodecleaner stayed in lock for more than 61 hours.
 A power drop as well as the oscillation of the HPL outputpower with a 40min period need further investigations. The transmitted power of the PMC does not show such an oscillation even though the ISS was turned off.

Rebooted the X1 Front End and IOP.  The "Load_MEDM_Values_X1.m" script was run to fill the X1 SUS QUAD matrix values.  The settings and values were then burt captured via the "burtgooey" to the following file:

"/opt/rtcds/tst/x1/burt/x1susquad/controls_1111114_173354_0.snap"

Installed newer dataviewer software in /ligo/apps/linux-x86_64 to correct "Word too long" error of dataviewer.  

Yesterday evening the laser was shut down due to a lid violation error. During the attempt to install the rf-summation box inside the 35W front-end box, we had made a mistake in the activation of the lid-overwrite, which is required to safely open the FE box. As we did not completely understood what happened we decided to leave the laser in the off state overnight.
Today the laser was restarted and run the full day without any problems. The currents of the HPL diode boxes were adjusted to the following values:
DB1: 50.5A
DB2: 49.1A
DB3: 48.9A
DB4: 49.2A

We installed and tested the water flow sensors for the water cooled power meters. All three flow sensors were set to switch at 1.5 l/min. If the flow is too low , the shutter of the high power lasers is automatically closed. With this system in place we can now operate the PMC overnight.

We continued to work on the beam path from the PMC pickoff port to the reference cavity. With the PMC transmitting 142W at the IO interface we get 387mW in the FSS beam path (measured directly infront of the FSS-AOM). The AOM is aligned to a double path efficiency of 59% such that 225mW are measured directly after the PBS downstream of the double passed AOM. (VCO_MOD_LEVEL 32000 in FSS MEDM screen, all power levels measure with an OPHIR 10A-V2-SH power head). A WinCam scan of the single path pattern is attached. The modematching was adjusted to give a 75% dip in the reflected light while scanning over the TEM00 mode of the cavity. The transmitted peak of the largest higher order mode has about 10% of the peak heigth of the TEM00. 

Attached are plots of dust counts > .5 microns.

Septic tank service

Dave, Cyrus moved h2boot, h2build and h2script0 into the DAQ rack in the computer users room

Changed light bulb for second projector from the left

(Betsy, Travis, Jason, Mark)

Mark measured the violin modes of the UIM-PUM loop. 

Put the reaction lower suspension (CP) in a triple hang. We again had to move more weight front to back than expected on the mass, indicating something fishy with the UIM weight symmetry in general.  Or something else.

Revisited the main chain triple hang, this time adding the magnet payload.  We again had to make multiple iterations to move ~100g to the front to correct for pitch seen on the PUM.  We currently only have (2) 62.5g masses on the back (magnet side) and we are still pitched up by:

5.217mRad up the UIM (measured with auto-level over short front to back lever arm of UIM)
4.384mRad up at the PUM
5.796mRad up at the ITMy

So, it looks like we are on for another round of moving mass on Monday.

Although a couple of the regular crew members were out for training, we proceeded with ICC making good progress. The area of the chamber not brushed yesterday was completed today and the entire chamber got first vacuum. About half the chamber got wiped down. The balance of the wipe down, second vacuum and inspection should be completed on Monday: then we'll have to decide whether we reallyARE going to FTIR 100% of this chamber on exit.

For more insight into the monolithic stage imbalance, I measured the violin modes of the wire segments supporting the PUM. The procedure was as for the fibre violin modes, except with the laser and QPD raised higher. The beam path was a few mm above the top of the mass and a few mm below the side shelves on the LSAT. The observed frequencies were

left front 415 Hz
left back 428.5 Hz
right front 414 Hz
right back 424 Hz

The .ini file "X1SUSQUAD.ini" did not have the channels needed for measurements uncommented.  The file was backed up in '/opt/rtcds/tst/x1/chans/daq/archive/' and edited for data acquisition by the DAQ.  The DAQ was restarted and the channels confirmed.

QUAD 04 BUILD 03

Now that the QUAD 04 has become BUILD 03, OSEM diagonalization measurements were performed this afternoon on the M0 and R0 top masses.  Two degrees of freedom were used for excitations while the responses of the individual OSEMs were plotted.  

The first attachment is of the M0 "Vertical" DoF diagonalization measurement. The excitation was a sine wave at 2.25Hz with 100cts of amplitude. The OSEM isolation from "Vertical" is at about ~34dB.

The second attachment is of the R0 "Yaw" DoF diagonalization measurement.  The excitation was a sine wave at 1.3Hz with 100cts of amplitude.  The "F1" OSEM isolation is at about ~24dB.  All other OSEMs are more isolated from "Yaw".

The third attachment is of the R0 "Vertical" DoF diagonalization measurement.  The excitation was a sine wave at 2.25Hz with 100cts of amplitude. The isolation is at about ~38dB from non-"Vert" OSEMs.

The M0 "Yaw" measurement was also performed with the same parameters as the R0 top mass and produced results that indicate "F1" is ~24dB isolated from "Yaw".  The plot was lost during a DTT crash, but will be posted when re-measured.

The ICC crew brushed about 80% of the chamber today after completing the usual round of pre-work wipe and FTIR samples. Dust counts were rigorously monitored due to the close proximity of the chamber to the test stand/fiber-welding areas. Drills were troublesome today (5 used) and one indicator that drills are having trouble is higher than usual particle counts. We were in touch with the control room a couple of times to report particle spikes in the chamber so that the information could be correlated with the dust counts being collected in the LVEA and adjacent cleanrooms.

The north and south doors blanks were removed from the chamber and the O-ring protectors were installed. Everything is ready to start brushing tomorrow.