It looks like we had a bad DAC channel in the IO chassis.  Jef G noticed we were unable to drive L2 UL coil.  Filiberto and I went out and traced it to the DAC card.  We swapped the DAC card and the channels are now working.  Will do follow up testing on the bad Card to see if it was something simple.

r

Cleaned out old data from /frames directory to get DAQ process to continue to run, restart x1isihamx and x1iopseibsc6 models to correct timing issues.

We confirmed physically the readbacks of the position sensors were in the correct arrangement but the corner2 & corner4 Actuator drives are reversed.  Vincent will look through the model to find the issue.

Jim, Vincent, Hugh

I prepared FTIR and tape sampling material and went into BSC1 via HAM4->BSC2. I took two FTIR samples (S1-upper left, to JPL, S2-upper right, to Alltia) and one tape sample (lower left) from the elliptical baffle. Next, I removed OSEMs and the elliptical baffle. The OSEMS are in a foil envelope in the staging cleanroom and the elliptical baffle and tape sample are in the OSB Optics lab on a flow bench with the BSC3 EB and the tape sample.

Mark L. and Chris H. got dust barriers ready and started installing them as soon as I got out. They will block off BSC1, BSC3, and HAM3. They are now on a hunt for the 4th solid dust barrier so that we can close off the new output mode cleaner tube. 

Mark D., Slim, Mick, Eddie, and Scott started removing view ports, etc from the HAM4 south door and staging for dome removal. They will continue working toward SEI stack de-install this afternoon.

For the record, Richard is out on the floor looking into it.

The test models were removed and the PSL models are now being run on h1psl0 (ISS, FSS, PMC and DBB).

The three video network cables were connected to the following video sources:

Ceiling cam in Ante Room (h1pslcam0)
Ceiling cam in Laser Room (h2pslcam1)
Video server (4 channels of analog video) (h1pslvid0)

The camera images are being displayed on the PSL monitor in the control room. These cameras support the "controls" account.

This is an old news, I thought that I made and entry but I didn't. Four vent washers that were stuck on the TMS cage structure were all removed.

At first we thought we'd leave them in place as we were afraid of flipping washers, and a gentle touch using our fingers didn't do anything.

This time, we stuck a long bolt in the hole to prevent us from flipping them, and used a clean plier, and that did the trick.

The "nds0" server appears to be offline. The CDS overview screen displays a white box for it's status. The "nds1" server appears to be functioning and online.

TMS alignment looks very good (despite ugly beam), and I think we're done with the in-chamber work.

We noticed that the pointing to the QPDs were off after last week's alignment process, and touched up the injection path on ALS table a bit.

After that, we used the first green picomotor to center the beam on the first folding mirror (bigger of the two folding mirrors) on the telescope because it looked off, and this made the centering on the secondary great. Retro reflection is very good.

Dichroics don't seem to be perfect, as witnessed by the existence of green beam in the red QPD path. A small fraction of green retro reflection is reflected off of the red pico mirror. This green beam is not centered in the red QPD path, and not hitting red QPDs. This might be due to the wedge in the splitter and ETM combined with the dispersion, but we don't know for sure. Though we have picos for red QPD path, and though we don't use red QPDs for the one arm test, we'll make some calculation so we'll know in the future installations if this green beam can be used for the alignment of the red QPD path.

We've done some close-up work like centering the OSEMs, checking apparent touching (there was none) and checking cables rubbing each other (there were subtle ones, which were fixed but not completely).

We took many pictures which will be posted to resource space by Alberto and Dan.

Attached are plots of dust counts > .5 microns.

Last week, the HEPI actuators were driven after reattaching them to the boots. Few tests were performed:

- Linearity test (LHO_HPI_BSC8_Linearity_test_20120504T163242.fig)

- Range of motion (make sure there is 0.8mm amplitude)

- Transfer functions (10mHz-100mHz and 10Hz-500Hz) and comparisons with measurements before detaching the actuators (ISI unloaded for QUAD repairs). The comparison shows no/minor changes in the plant.

Note that the 100mHz and 10Hz points are linked.

https://svn.ligo.caltech.edu/svn/seismic/HEPI/H2/ITMY/Data/Figures/Transfer_Functions/Comparisons/L2L/

• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_H_to_IPS_H_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_H_to_L4C_H_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_V_to_IPS_V_20120216_vs_20120507.fig
• LHO_ISI_BSC8_Comparison_TF_L2L_ACT_V_to_L4C_V_20120216_vs_20120507.fig

PSL installation team

We aligned the modematching between the HPL (200W laser) and the DBB as well as the modematching between the frontend (35W laser) and the DBB. The 200 mm quartz modematching lens inside the DBB box (on the rail) has been exchanged with a BK7 lens of the same focal length. The second lens on this rail (BK7, 80mm focal length, PlaKo) has been turned, such that the plane side faces to the first lens. On the MOPA path the 100 mm modematching lens has been exchanged with a 200 mm lens (both BK7).
We performed a modescan and measured 6.7% in higher order modes for the 200 W system and 4.9% in higher order modes for the MOPA.

We aligned the IS AOM (high power AOM), measured bandwidth: 3MHz.

The work on the rest of the beam paths is ongoing. 

(corey,eric,jim)

HAM#5

Particle Fences were stripped off of HAM ISI#6 & installed on #5 (and then Mitch found our missing last two sets of Particle Fences).

Finished off the swap of Horizontal GS-13s, but did some serial number bookkeeping before walling things up.

Horiz Actuator s/n:

• H1:  023
• H2:  115
• H3:  117

GS13s (vertical alread-installed) 

• V1:  074
• V2:  072
• V3:  004

GS13s (newly installed on 5/14)

• H1:   013
• H2:  038
• H3:  071

HAM6

Particle Fences removed, Spring Covers installed.

Last week-end, we took a last set of transfer functions to build a nice reference and confirm that the ISI is ready. Note that some resonances (17Hz, 26Hz) observed in corner 2 (horizontals) during the previous measurements disappeared. I have attached a transfer functions comparison that illustrate the problem in stage 2 corner 2. The SUS crew worked intensively on the QUAD to solve rubbing issues, touching flags, miscellaneous adjustments, etc...; it can explained the differences between the two measurements. I superposed 3 horizontal transfer functions in corner 2 :

• 2012 02 03 : with FM and QUAD (fiber)

• 2012 04 27: with FM and QUAD (metal)

• 2012 05 12: with FM and QUAD (metal)

The last set of transfer functions can be found at:

https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ITMY/Data/Figures/Transfer_Functions/Measurements/Undamped/

*2012_05_12*

Following is the list of items that need to be completed (in roughly the order below) before we can close this chamber.  Some of the items have been finished and are still on the list as markers for redlining the installation procedure.  Please add a comment if I have missed any steps

1) Electrical grounding checks - DONE
2) IAS SEI alignment complete, ISI & HEPI floating - DONE
3) IAS ETMy alignment Round 1 - DONE
4) TMS alignment - DONE
5) ESD continuity check
6) Clamp ETMy EQ stops
7) Reapply FirstContact to ETMy-HR and ERM-AR
8) Swap Flooring - Waiting for FTIR on new set, can slip down list but not beyond 14a.
9) Viewport in-situ cleaning (or swap if deemed necessary)
10) TMS OSEM alignment
11) Close the ring heater and set fiber guard to "nominal" position
12) Unlock ETMy, remove all TFE except TM line stops, and physically check for rubbing as per T1200213 (still drafting)
13) ETMy BOSEM alignment, factoring in buoyancy as per T1100616
14a) ETMy testing (See Phase 3a G1100693)
14b) IAS ETMy alignment again (if testing showed interference and suspension was adjusted to fix)
15) Repeat step 14 until all Phase 3a testing is complete - usually done in 3 rounds in order to clear all issues.  Note, IAS requires removal of ETMy-HR FC completely. 
16) TMS alignment check if needed
17) Lock down flooring nuts if loose
18) Set all EQ stops as per M1100256
19) Final FirstContact cleaning if needed
20) Remove TM line stops
21) Take pictures and count number of PEEK clamps
22) Set witness plates
23) Remove all tools
Shut the doors.

Szymon Steplewski, Jeff Garcia, Mark Barton, Fred Raab

This afternoon we tested the ITMY lower stages to check whether the OSEM actuators were working correctly.  We found that upon exciting stage L2 the UL OSEM was not registering any change in the voltage monitor H2:SUS-ITMY_L2_VOLTMON_UL_MON, while the other three seemed to be responding to our excitation.  The corresponding NOISEMON channels also indicated that the UL OSEM was acting differently from the other three.

We decided to try injecting a 1 Hz sine wave excitation and looking at the time series of the VOLTMON and FASTIMON channels.  Our test confirms that each OSEM is responding correctly to this monochromatic drive, except for the stage L2 UL OSEM.  We will next diagnose whether this is a hardware or software related problem.

- TMS group worked at Y-END.
- SUS group TFs at ITMY.
- Outside visitor for well decommissioning, to pick up left items, drove past X-END station.
- Pump down of H1 input started, currently at 9.5 x 10^1.
- Apollo staged items for ICC, by HAM4/BSC2 per permit 3210.
- Cleaning crew cleaned HAM4/BSC2 area per permit 3213.
- PSL group at H1-PSL area, in and out of enclosure.