The 59 Hz chiller pumps at EY produce turbulence in the water lines that results in a peak at about 9 Hz in seismic spectra at Y-end. This peak creates problems e.g. for ISI. We have been planning to install a variable frequency drive (VFD) at EY so that we could reduce the water flow, in hopes of reducing the turbulence. The VFD was installed at EY this week and I ran some tests at various frequencies (pump speeds). Figure 1 shows that the peak is nearly at background with the VFD set to 30 Hz, instead of the nominal 60 Hz. 40 Hz is also pretty good so we decided to run at 35 Hz from now on. We believe that the cold water flow rate is down by less than a factor of 2 and that this should be sufficient for our needs. We will find out for sure when it gets hot next summer. We also now have VFD at EX and the corner station so we can adjust these as needed.

End Y is, as of now, in a seismic condition pretty similar to what we plan for aLIGO science mode. There are still a few pumps making sharp lines, but the broad band should be pretty close, especially when people are not out at End Y. To test the pointing of the seismic array, I placed a shaker on the floor at two locations Wed. night, running at 12 Hz. The times were:

Nov. 15 2012 0:54:54 UTC to 2:20:40 UTC (last ten minutes were the most quiet) and

Nov. 15 2012 2:29:40 UTC to 3:00:00 UTC (first fifteen minutes were the most quiet).

Robert S., Richard M., John W.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Nov. 15 to 6 PM Nov. 16. Also attached are plots of the modes to show when they were running/acquiring data.

There is still an occasional calibrate failure alarm on the dust monitor in the OSB optics lab.

Dust monitor 4 in the LVEA was turned back on.

[Michael Rodruck, Alberto]

Today we finished setting up the optical path to couple the PSL reference cavity tranmsitted beam into the ALS fiber. After we mode matched the beam to the fiber launcher, we aligned it into the fiber by using the OzOptics auxiliary fiber laser.  We coupled 3.0mW into the fiber, out of the 5mW coming from the reference cavity: a 60% matching. It didn't look like this could be imrpoved by much.

Both ALS setups on the PSL table are now almost complete. The only work left to complete is the replacement of the Faraday's mount on the ISCT1 pick-off path: the mount is currently under construction at the machien shop.

One hypothesis for the source of excess vibration noise on the PSL table from the crystal chiller circuit (here) is that the ~2 mm aperture in the quick-connect hose fittings on the 5/8” ID hoses causes a turbulent jet of water that, especially if bubbles are present, modulates the flow of water. Figure 1, lower plot, shows that a quick-connect is about two orders of magnitude more noisy than a barbed barrel connector for the 10 - 15 l/m flow through the crystal circuit of the crystal chiller. Figure 2 has a photograph of the setup.

To see if the noise from the quick connect might be loud enough to explain the noise from the whole circuit, we clamped the quick connect setup used for the above measurement to the outside manifold of the crystal box (setup photo shown in Figure 2). The upper plot in Figure 1 compares the nominal noise to the noise from this setup. The peaks produced in this way are relatively large but don’t match the peak from nominal flow through the box. However, the momentum transfer to the table for our test is much different than in the actual setup.

I think the results are suggestive enough that it would be worth an experiment where we replace the two quick connects at the crystal box manifold with barbed connectors. To further improve the flow, we suggest that we use the capped threaded holes for this in order to make one less 90 degree turn. Figure 2 also has a photograph illustrating the proposed modification.

Robert S., Michael R., Rick S.

WP#3568

Following the wiring of the new BSC6 75l/s Ion Pump, I created a new database file for the h0veey VME IOC called HVE-EY:75IPBSC6.db. This is essentially a copy of the existing BSC10 database, with BSC10 replaced by BSC6 and 411 replace with 425.

At 13:31 we restarted h0veey with the new database, all went well. I also changed:

• MEDM screens on both legacy and aligo systems
• autoburt.req files and added VE to the aligo hourly snapshots
• Added new channel the H0EDCU_VE.ini and restarted H1DAQ to trend this channel (HVE-MY:75IPBSC6_II425) 
• Fixed the web medm screen shots to add new channel and put a timestamp on each top level screen

I also fixed the MEDM to MEDM links for the vacuum screens on the control room machines.

Unifirst arrived with floor mats.
A viewport was installed in the septum between HAM 1 and 2.
Michael R. transitioned the LVEA to laser hazard for MC locking work.
Michael R. transitioned the LVEA to laser safe.
Richard and Dave added the ion pump on BSC6 to the control system.
Michael R. and Alberto worked on aligning the PSL ALS optics.
Dale lead a tour through the control room.

   This afternoon Andres and I removed the H1-Pr3 and H1-PRM HAM suspensions from their storage containers and placed them on the chamber-side optics table in the LVEA. No problems were encountered during the move.  

I needed a little hardware for the dial indicators for BSC1 and I had to rob from BSC6.  The two western DI trees are no longer engaged but the East side has three axis monitoring still on both corners.  And of course there are still the HEPI IPS.
Before disconnecting the west side, I recorded the indicators and comparing to my last recordings, they are still reading valid.  I see a coherent rotation of about 0.1mrad clockwise wrt the readings I logged on 30 Aug.  The vertical readings are unchanged.

For new shells started after 12:03 PST, the default nds server has been changed to h1nds0.

Installation of last Custom Wedged Viewport VP2 to IO Septum (between HAM 1 & 2) completed with Apollo.
Wedged VP orientation was with the thick part of wedge (scribe mark on flange) to 3:00 O,clock position so deflection is horizontal in nature.
HAM1 can now be isolated as needed.

The IR beam was successfully aligned from the PSL to HAM2, through the IO periscope, off 2 steering mirrors, and through MC1 to HAM3.  In HAM3, we discovered that MC2 has FC, which precludes bouncing a beam back to HAM2.  We aligned the beam to MC2, explored some options for continuing to work, and then called it for tonight.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot from approximately 6 PM Nov. 14 to 6 PM Nov. 15. Also attached are plots of the modes to show when they were running/acquiring data.

The sensor may be failing in the dust monitor in the optics lab (H0:PEM-LAB_DST1). The calibrate failure alarm is being raised momentarily (status of 1 in attached plot).

Dust monitor 4 in the LVEA may have been turned off after the cartridge install. It was in the clean room over the test stand farthest from the Y manifold.

I continued the build of the SUS frontend for ITMY (h1susb123). Richard resolved the SFP timing issue this morning and the IOP model has been running all day. I built the h1susitmy model by copying the H2 model this afternoon but then found that the H1.ipc IPC file has exceeded the 64 Dolphin channels limit. It exceeded it some time ago when EY was copied over to H1. So I have put a halt on ITMY development until we can get this resolved. I have taken out the ITMY IPC channels from H1.ipc and stopped the h1susb123 models for now.

Noted that the computer time was about 4 minutes fast, investigated, found ntp had not been installed on h1dmt0.  Installed the ntp package, configured, set the date, and started the ntp client.

Michael R. and James B. fixed one of the cameras in the H1 PSL enclosure.
James B. moved the H1ECATC1 computer to a different rack in the MSR. I shutdown and started it, including the TwinCAT PLCs and EPICS IOCs.
The ITMY cartridge was moved from the test stand to BSC1.
Michael R. transitioned the LVEA to laser hazard to allow PSL light into HAM1, HAM2 and HAM3 for the first attempt to flash the MC.
SKi and a visitor worked on the FMCS system.
Joe G. worked on the IOT1 table.
Keita and Kiwamu worked on deinstalling a PZT controller at end Y.

Dale documented so I'm sure he will have some video/photos available soon.
So real issues other than a waiver on a torque wrench use.
Flying weight was 9440lbs less the 440lbs of the Tri-Lifter for an even 9000lbs Cartridge.  There was no Keel or Stage1 Vibration Absorber mass which totals 600lbs plus 60kg.  We'll be adding that to the Assembly next.
Thanks to JimW MitchellR Zac & Scott, Randy Bubba & Jody too.

John took the attached RGA scan of the Y-end station today using the iLIGO RGA (not Rai's hydrocarbon RGA)

I've laid out most of the components on IOT1 table including partially setting up the periscopes. The components for the MC REFL path are in roughly the correct position. The components for the MC TRANS path will need to be adjusted for the final periscope location. I looked into using the round periscope that is currently sitting in the MC REFL path and determined that it may be necessary to make some modifications to the design in order to adapt it for use with 2" optics. I've set up the triangular MC TRANS periscope for use with the new 2"optics. 
I cleaned everything that was installed on the table and left the HEPI fan running.

The table currently requires the following items.

1) 4" Holes cut in end panels for venting
2) 45 degree mounts purchased for lower periscope mirrors to mount to table
3) Adaptation of round periscope for 2" optics?