THis morning:

- The Apollo crew removed the walking plates at the dome flange.
- Travis and I entered the chamber to resume EQ stop setting
- Apollo craned the dome into place over the stack upstairs
- Covered the QUAD with it's C3 cover when the Apollo crew removed all of the C3 covers above us (the dome flange was now hovering ~2ft above the flange)
- Once the dome was mated to the flange and the "dust had settle for ~15 mins" we uncovered the QUAD and resumed prep work.
- Performed peel of FirstContact of ITMy-HR, N2 filter blow, swab wipe dab-removal of some particulate (see a subsequent alog for details of this)
- Removed most hardware and 2-step stool from chamber
- Betsy left chamber, Thomas and Lisa entered
- Travis, Thomas, Lisa swung ACB back into nominal position and removed stiffeneing hardware
- - Broke a witness plate in the process so a quick cleanup and replacement of new witness plate in the same location
- Took particle count samples from center of chamber
- People swap again, Betsy in, Lisa/Thomas out
- Removed balance of tools/hardware
- Betsy/Travis removed internal Fiber Guards
- Wiped floor from North-to-door, checking for tools/hardware - none found
- Exited chamber
- Leaned in and placed last 3 witness plates in center of chamber

Door replacement preps are underway.

Corey, Greg, Jim, Mitch, Vincent, Hugo

Transfer functions were taken on HAM-ISI Unit #1 with its top mass sitting on a kinematic mounting. The unusual high Q resonances observed above 100Hz are also gone under this configuration. This result tend to confirm that the resonances observed came from the contact between the top mass and the optical table, and not from the ISI itself.

Resonances appeared between 170 and 260Hz when switching to kinematic mounting. They are mostly visible on vertical measurements. These resonances were not here initially, when the top mass was directly sitting on the optical table. They are caused by the changes applied on the boundary conditions of the Top Mass and shall not be associated with the ISI’s mechanical response.

TF comparative plots are attached.

• Pitch: ~1.06 mrad down
  • Desired pitch: 639 µrad down
  • Outside ±100 µrad test stand spec
• Yaw: ~365 µrad CW
  • Desired yaw: 0 µrad
  • Outside ±100 µrad test stand spec
• Longitudinal: 4mm West
  • Outside ±3mm test stand spec
• Horzontal: 0.86mm North
  • Within ±1mm test stand spec, but may be adjusted closer to the desired position
• Vertical: 0.2mm high
  • Within ±1mm test stand spec

ETMy alignment will commence as soon as SUS personnel are available to make the required moves of the quad structure (currently working on closing out BSC08).

(Corey, Greg, Jim, Mitch)

HAMISI#2 was put on the east most Test Stand.  It will get taken apart (to removed the badly machined plates), and re-assembled, and then re-tested.

This afternoon, with the ISI still unlocked from last night, Travis, Cheryl and I:

- Took pix of the chamber cabling/table layout/etc.
- Set FMy EQ stops to ~0.75mm gap settings and locked down all nuts
- Clamped the ITMy and ERM Masses
- Removed the ERM-AR FirstContact
- - Observed lots of particulate, even after continuous filtered N2 flow
- - Took pictures of this particulate for posterity
- - In light of the particulate, decided to stop and discuss moving the dome placement next in the close-out procedure before pulling ITMy-HR FC
- Closed the ring heater
- Placed a few witness plates in the tube sections adjacent to the chamber
- Unlocked the masses - the QUAD was left in full suspension

Garcia is running some diagnostics on the lower OSEM controls on the QUAD tonight.
We await his results, but anticipate pulling the walking platforms and placing the dome on the chamber tomorrow morning.  We would like to resume our in-chamber QUAD/ACB final preps once the dome work has started.

Corey, Eric, Greg, Jim, Mitch, Vincent, Hugo

Unusual resonances were observed above 100Hz on LHO HAM-ISI Unit#1.  GS13 doors and their brackets were not fully bolted and torqued. These mistakes were corrected, however, the resonances observed only disappeared when Viton pads were added under the ISI‘s Top Mass. 

It is possible that the top mass had uneven contact with the optical table causing it to rattle (We could actually hear the mass ring when being hit with an allen key).  

However, we want to make sure that the resonances are not reduced by the couple "Viton+Top mass" behaving as a mass damper. We are currently trying to find out by measuring the ISI's response with its top mass sitting on a kinematic mounting. 

The comparison curves of the TF before, and after, adding Viton pads under the top mass of the ISI are attached.


Note: The picture of the top mass was taken a bit more than a week ago. The balancing masses layout is not as on the picture anymore, but the top mass remained roughly at the same position (slightly re-centered during Viton Pads insertion).

First layer of exterior sheetrock has been laid down. Edges were filled with backer rod and caulked.

Wednesday night at 8pm local time approx, cdsfs0 went into "read only" mode whereby the NFS fie system looked available, but had detected an error and switch to its safe state. Vincent rebooted the machine via phone support from Dave.

Today we power cycled cdsfs0 at 3pm to activate its IPMI management port. Now it will be possible for CDS sysadmin to remotely power this machine.

As part of the h2fw0 crashing every 3 hours problem, I switch which QFS file system the H2 frame writers write to

35W beam

200W beam

This morning we started adjusting out the ETMy reaction chain 1mm high and 2-3mm side-shift.  We removed 2mm from the right Tops Stage blade tip.  This indeed did lower the chain, and reduced the side shift some.  There is still ~1-2mm of side shift.  During these adjustments we also noted a differential roll between the UIM and Top Mass, which Jeff warned us about.  We snooped around at blade tip heights, mass asymetry, and wire lengths.  Hoping that it was possibly a wire length, we decided to swap the left and right wire segments between these stages.  This did not change the side-shift or roll, indicating that the wire lengths are built properly.  We next will visit the blade tip heights (ugh).

(Mark & Slim from Apollo)

Just to give an update on the Staging Bldg Cleanroom issues noted last month.  Last week, the flimsy castors (actually, it was just poorly designed cleanrooms---weak castors not installed securely in thin boxbeam legs) were replaced with much beefier replacements (after seeing cross-section of legs, still wish they were thicker/stronger like the VEA cleanrooms).  Photos are attached.  These were replaced on the two (of four) cleanrooms we move the most down there.

(obviously both of the attached photos should be rotated clockwise 90deg, seems like the alog doesn't like my photos!)

(Corey, Eric, Hugo, Jim)

Investigations continue for the big mechanical resonance peak around 120Hz.  Hugo has given us a rough location of where to look (Somewhere around the H3 GS-13).  On Monday, we pulled out H3 (replaced with mass), but there was no change.  Also on Mon we pulled some walls in hopes of finding anything obvious.  One issue noticed were a pair of 90degree Wall Brackets which were loose (at V3); see attached "photo(3)".  These were torqued down, but the 120Hz peak was still there---Hugo did notice broadband noise reduction in the high frequencies by torquing these brackets down.

On Tuesday, Jim started banging on things to see if he could hear any rattling/ringing.  He noticed a ping when hitting the big Leg Element weight on the Optics Table.  We decided to put some Viton pads underneath it.  Hugo went with a checkerboard pattern ([48] 0.5"x0.5" 0.0625" thick pads); see attached photos....grrrr, the last photo should be flipped, looks fine on my computer before I uploaded.  Waiting to hear how the measurements turned out on these guys.

Attached are plots of dust counts > .5 microns. I have included a plot of H0:PEM-LVEA_DST15_MODE to show when the dust monitor at location 15 in the LVEA (in the clean room over BSC8) was disconnected (when the mode stops changing).

Roof insulation and drywall installed today. Crew will most likely need the crane for the next few days for fall protection

We have re-applied FirstContact to the ITMy HR and the TCP AR.  When we peeled the "old" sheet from the ITMy HR we observed ~10-20 particles per square inch.  (We did have continuous N2 filter flow over the surface during th epeel and during the inspection.)  I used the alpha swabs in an attempt to free some of the larger particles from the surface - I was successful on most of the larger which were more like ~1 per few square inches.  We also observed alot of the streaking observed and recorded before.  We hope the new sheet which we plan to peel tomorrow will remove the streaks and most of the particulate.
The TCP AR surface appeared much cleaner, likely because we never pull this sheet for IAS purposes.

After re-suspending the masses, we adjusted one of the PUM OSEMs and one of the UIM magnet flags as Garcia needed another round of tweeking on those.   

The ITMy has been left suspended.
The FMy is also suspended.

As of this writing the ISI is still locked.

J. Garcia, J. Kissel

I've reprocessed J. Garcia's results from the latest X1 SUS QUAD03 (an ETM-type QUAD) to include a few extra measurements and the appropriate model. Results on both chains look identical to QUAD04 (now H2 SUS ETMY), and match the model(s) quite well. 

For both suspensions, all measurements are with lacing cables down the reaction chain. The earlier measurements of each (2011-11-19 for QUAD04 and 2012-01-24 for QUAD03), are the first attempt at lacing the cables and the later measurements are after some adjustment. As one can see, the main chains (M0) are for-all-intensive-purposes identical in all four measurements. On the reaction chains (R0), the only the pitch transfer functions appear different between the cabling adjustments, and most notably the second mode at ~1.7 Hz. As for the over all shape difference from the model (e.g. much lower magnitude at DC, over shift up in mode frequencies), we understand this is due to cables stiffening up the pitch degree of freedom in general. Because we've seen this now in 3 suspensions that have had their reaction chains cabled: X1 SUS QUAD 04, X1 SUS QUAD 03, and H2 SUS ITMY (ITMY is not shown in these plots because it's a different reaction chain type, but you can see the change referenced in aLOGs 1831, 1769, etc); AND the change in stiffness appears consistent and reproducible, we are not concerned.

Pending no further mechanical additions / adjustments need to be made (i.e. he's as assembled as he can be before moving on to get have his lower have exchanged for glass), this suspension is good to go. However, we should leave him on the mechanical test stand for exploratory measurements (e.g. OSEM to OSEM basis transfer functions, long-term noise and stability studies).

Details
-------
The script that produces these plots is
${SusSVN}/sus/trunk/QUAD/Common/MatlabTools/plotallquad_dtttfs.m
to which I've made several improvements to while making these plots (because of the bug in how the script adds models to the plots):

- Now recalculates appropriate model on the fly according to quadType of last measurement, as opposed to using loaded model precalculated in the last measurement analysis. 
- Cleaned up messages to command window regarding loaded files. 
- Now only loads files that are in useMeasts. 
- No longer addpath genpaths, because it was unnecessary to begin with. 
- Moved useMeasts and figFileTag to top, so it's more visible. 
- Corrected 2012-01-06 measType. 
- Other small changes that I've now forgotten.

So please svn up before using this script again!

A. Effler, J. Garcia

Transfer function measurements on the H2 ITMY R0 top mass were completed last night with the results attached.  Damping loops on the M0 mass was ON as well as for the FMY M1 stage.  The BSC ISI was UNlocked for this measurement as well.  Resonances for this measurement are more prominent than the previous night's, which were incomplete due to the watchdogs tripping in the morning work hours.  Initial observations indicate the DC scaling calibration factor is still slightly lower than the model with the exception of the Longitudinal and Yaw DoFs.  The second Longitudinal mode is about ~0.2Hz lower than the model. The first Yaw mode is slightly higher (~0.05Hz) than the model prediction. Comparisons of this measurement with previous data from the LVEA test stand and Staging Building are still to come.