The pump in the dust monitor at mid X (S/N 980700963) appears to have failed. I have removed this dust monitor from mid X.
Today, Travis and I hung the ITMy monolithic lower chain in a triple. Jason can fill in the numbers more completely, but we reconfirmed that the pitch error between the test mass and PUM was 1-2mRad (single pendulum hang). The PUM to UIM differential pitch was ~5mRAD (double hang) and there was a pretty serious mis-pitch on the UIM when hung in a triple from the triple hang tooling. We made one round of adjusting masses on the UIM, but have more work to do there tomorrow.
The attached plots are the results of open-loop transfer function measurements for the M1 stage of H2 FMY. The measurements are open-loop from the "H2:SUS-FMY_M1_TEST_*DOF*_EXC" channels to the "H2:SUS-FMY_M1_DAMP_*DOF*_IN1_DQ" channels. Results agree quite nicely with the model. There might be a lower signal-to-noise ration for the really low frequencies (See "L","P",Y" below 0.5Hz), so further measurements with higher drive amplitude in this band might be desirable. Scripts, data, and plots are in the SUS SVN. Excitation and Data retrieval script:'~/SusSVN/sus/trunk/BSFM/H2/FMY/SAGM1/Scripts/collect_TF_H2FMY_M1_allDoFs_0p05to50Hz.m'Data .mat file:'~/SusSVN/sus/trunk/BSFM/H2/FMY/SAGM1/Data/111108_H2FMY_0p01to50hz_all_DoFs_5Kcts_highres.mat'Plotting script:'~/SusSVN/sus/trunk/BSFM/Common/MatlabTools/plotBSFM_matlabtfs.m'Plots (individual and combined):'~/SusSVN/sus/trunk/BSFM/H2/FMY/SAGM1/Results/'
Here's the remaining degrees of freedom, and I've fixed a big in the x ticks, such that they're on powers of 10 (instead of 0.5, 5, 50, etc). Initial investigation comments: We don't understand the blip at 0.65 Hz in Longitudinal. It doesn't appear in any other degree of freedom, and especially not in the likely suspect of Pitch. (Though there is some evidence for excess coupling in the L to P transfer function -- see page 10). The higher Vert, Trans, and Roll modes are lower in frequency than the model. Not really a point for concern just yet, we'll need to compare against (i.e. put on the same plot) the 110823 measuremnt (in progress). The lowest modes in the Pitch TF are not as "Q"-ey as we've seen. The highest Yaw mode is also not as "Q"-ey as has been seen. My guess is there's something rubbing, 'causing the reduced Q's of the P and Y modes, and also cause the weird blip in L. More analysis to come!!
Also, I've commited and updated the changes toplotBSFM_matlabtfs.mthat merge all plots produced, and fixed the axes bugs. Update to rev 1548
Attached are plots of dust counts > .5 microns. Channels for LVEA Location 11 were added to the frames this afternoon.
Since the Apollo crew got the large shelving units set up in the West Bay of the LVEA, we started with a little clean up today so you will notice a few changes. There will be more alterations as we prepare to receive more beamtube parts, get ready for the BSC-8 cartridge install, and clear out the area around the H-1 PSL enclosure.
FTIR results from BSC-4 came in this afternoon. Although there were three "hot-spots" among the pre-work samples, all three cleaned up nicely (at or below detectable)after brushing and wipe down (and that includes the "green goopie"). Please see actual reports attached.
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.
I just noticed that I had posted this as HAM-11 ICC (which is a correct iLIGO chamber number). It should really be HAM-12 and will be hereafter.
Note: ICC work is taking place in HAM11 and HAM12 which are not using purge air. BSC4, HAM9 and HAM10 are vented but are buttoned up and without purge flow.
Summary of H2 PSL install over past few months; computing and networking components:
The following H2 PSL items have been temporarily installed in the LVEA adjacent to the enclosure:
The following units have been installed in their final locations
The H2PSL LAN is being broadcasted in the LVEA to permit wifi laptop operations inside of the enclosure.
Dan and Dave:
powered down h2ldasgw0 to investigate the frequent crashes of h2fw0 and associated QFS errors on the ldas gateway. We redistributed the fiberchan cards between two pci-e risers (before they were both on the same riser). Dan did a qfs fsck on the /frames file system as well. Although a new error was reported on h2ldasgw0 on startup, h2fw0 has now ran for 19hours with no crash (before it would not run for more than 4 hours). We'll get more runtime info before making a decision to swap out hardware.
Cyrus, Jim and Dave:
relocated the "GC" CDS servers from the MSR to the computer users room as part of the prep work for the MSR shutdown. We moved the machines
These are all on the GC network (sugarloaf is also on the old 10.1 network, which Cyrus added to the CUR switch).
Attached are plots of dust counts > .5 microns. The flat line at the end of channel H0:PEM-LVEA_DST7_5 (LVEA location 7) is probably from when the dust monitor was moved (see earlier report). The dust monitors in the beer garden and the OSB bake oven room still need to be fixed, but I have no ready replacements.
Now that the latest QUAD build has been completed, Yaw Diagonalization measurements were run on the M0 and R0 masses of the new quad build. On Friday, the measurement on M0 was run which indicated less-than-ideal coupling of the F1 OSEM to Yaw. Ideally, the isolation should be at around ~30dB for each OSEM not contributing to the Euler-based DoF. The first attached plot shows the F1 OSEM at around ~18-20dB isolated from F2 and F3, the "Yaw" OSEMs. The measurement excitation for this measurement was a sine wave at 1.353Hz with a 100-ct amplitude. A slight "Roll" on the M0 mass was noticed with a bubble level after these results, and it was decided to try to correct the offset by adding shims under the M0 blade springs. After realignment, the Yaw diagonalization measurement was run again with the same result (it is actually this measurement that is attached as the first pdf - the measurement from Friday was identical). A new measurement was then set up with slightly different drive parameters. The drive frequency was changed from 1.353Hz to 1.3Hz with the same amplitude. The second attachment is a plot of the results. The F1 OSEM is now noticeably more isolated at this frequency with an isolation of ~28-30dB from "Yaw". Thus, the Yaw diagonalization for the M0 mass on the new quad build is now in an ideal configuration.
The dust monitor at LVEA location 3 in the LVEA ISI/QUAD test stand was moved to the fiber welding area in the LVEA probably sometime between 15:00 and 16:00 PST today by Jeff G. The dust monitor at LVEA location 7 was moved from the previous location of the H2 electronics racks to LVEA location 11 between the clean room over HAM12 and the clean room over the LVEA ISI/QUAD test stand at around 16:00 PST today. The data for LVEA location 11 is not yet in the frames. The alarm settings also need to be updated.
This afternoon, the re-entry of HAM-10 was completed for two purposes: to re-sample the "hot spot" on the floor and to remove the dust barrier that was left in for extra protection of the chamber while BSC-4 was being cleaned. The "hot spot" was FTIR-ed prior to any other activity in the chamber. Then the dust barrier was removed after being wiped down. The nozzle area that held the barrier was also cleaned up. On examination, the side of the barrier toward BSC-4 did not show any visual evidence of extraneous particulate accumulation nor did a wipe turn up anything worrisome. This supports other evidence that the in-chamber cleaning process does not allow the liberated oxide material to travel far. The "hot spot" was then wiped down and re-sampled. The chamber was exited and the door blank was reinstalled.
activities throughout the day: Unifirst delivery at ~9:30 cleaning out near HAM12 and BSC-ISI clean room Patrick moved dust monitors End-Y TMTS assembly/testing
Yesterday we aligned the AOM in the high power path. The alignment was optimized to have maximum power in the right direction of the first order diffraction, in order to be able to dump this beam in front of the PMC, see Tablelayout (DCC-T0900610). The alignment of the PMC was optimized for high power operation. Afterwards we had 156W in transmission and 14W in reflection of the PMC without a beam diffracted by the AOM. We also calibrated and linearized the diffraction of the AOM (the potentiometer in the Servo was adjusted to have 0.234V at the signal connected to the AOM driver, when the AOM offset was 0V). In AOMOffset2power.pdf you can see the linerization. From the fit in AOMSignal2Power_diffraction.pdf one can get the values to calculate the AOM diffraction in %.
We are moving the pure GC CDS servers from the MSR to the computer users room this morning as part of the CDS maintenance. alog was one of these machines, it is now up and running in its new location and we dont expect any further downtime. The other machines which will go down during this move are: yakima (bugzilla) redoubt (CDS SVN) sugarloaf (email VE alarms)
Attached are plots of dust counts > .5 microns. The dust monitor in the "Beer Garden" and in the OSB bake oven room are not plotted. Both have reported sensor failures.
HAM-9 close-out work (second vacuum, inspection, post-work sampling, and door replacement) was completed today. A cleanroom was moved over HAM-10 for dust barrier retrieval tomorrow and staging was started around HAM-11/12.
This morning, Giles, Travis, Mark, and Jason measured modes of the single pendulum monolithic: Bounce = 6.7 Hz Longitudinal/Transverse = 6.66 Hz Pitch = 1.1 Hz Yaw = 1.1 Hz All as expected. Roll and violin measurements to take place this afternoon.
TYPO on the Longitudinal/transverse - it should actually be 0.66 Hz.
