This report is for yesterday, 12/10/2012.

Justin reported that all the dust monitors in the LVEA were suddenly reading INVALID. I looked at the IOC running on h0epics2 and it was reporting errors. Restarting the IOC did not fix the problem. I went out and power cycled the Comtrol in the LVEA. Restarting the IOC again after this brought them back.

There will be gaps in time for this day that can not be trended, due to the values being set to NAN when the code was restarted. Plots in dataviewer for the counts will have to use times that do not include these gaps.

Kyle 
Opened GV1 (12/10/2012) 

Kyle, Gerardo 
Opened 2.5" and 1.5" metal angle valves on BSC3 dome -> Began pumping the combined volumes of the YBM and the Vertex (minus HAM1, 2 and 3).

The South East corner of BSC 9 had the HEPI housing installed incorrectly causing the foot to have insufficient clearance around several points. The bolts had been over-torqued and/or the tapped holes had chips and one bolt galled. A sawzall was used to chop through the bolt, and then a drill was used to remove the rest. After retapping the hole ~75% of the threads remained, which should be sufficient for only a 45ft-lb torque. Additional holes had to be drilled and tapped to allow the clamps to be used with the new housing position. The housing was reinstalled and the support tube should be within a couple thousandths of where it was originally sited in.

The HAM cleanroom was moved over HAM9 yesterday in preparation for an incursion. The cleaning crew will try to get cleanings done so that the door can be removed today. A garbing staging cleanroom will be moved into place ASAP. Robert, Cheryl and I are tentatively planning on an inspection tomorrow.

This report is for Monday, 10 Dec 2012.
Brushing of the floor and all hand work complete. The crew was pulled off to work on other things and to await some tooling from Clean and Bake.

This report is for Monday, 10 Dec 2012.
The dome bolts were torqued down in the morning and the door was returned to the chamber in the afternoon. Door bolts will be torqued today.

Thomas, Jax

We finished installing and aligning the H1 ITMY optical lever and measured the beam profile.

Parameters of the laser are listed below, this data was measured in-situ using Thorlabs BP109-VIS: 

Gaussian_Fit_X = 97.46%
Gaussian_Fit_Y = 97.66%

2w_X = 4.06 [mm]
2w_Y = 4.05 [mm]
Requirements = 4mm

Mark B.

Starting DTT TFs on MC1 and MC3, in parallel.

Joe Gleason, Luke Williams, Cheryl Vorvick

Location: HAM 2

We've aligned turning mirrors RH5-6 which steer the PRC MM MON and MC TRANS MON beams to IOT2. We've set the beam separation such that these beams converge at the location of the IOT2 upper periscope mirror.

•	PSL diode room temperatures continuing to fluctuate between 65F and 70F, producing alarms. This has been an ongoing issue since 6DEC. Michael R has 
        made adjustments to the heating units for the room and this should help.

•	0700 Work is ongoing in and around BSC1. Bolts on the dome flange were torqued first thing this morning by Apollo---tripped ITMY SUS watchdogs.

•	0930 Kyle opening GV-1

•	1100 Travis S et al removing First Contact from ITMY---unsurprising SUS watchdog trips.

•	1300 Thomas V and Jax S working on optical lever alignment in LVEA.

•	1330 Bubba craning cleanroom over HAM9 to prep for MC tube inspection.

•	1450 Dave B and Jim B to MX.

•	1500 All LVEA dust monitors went INVALID---Patrick was investigating.

Mark B.

Received word from Bubba that the doors were on BSC1 and personnel were clear, so will be taking TFs on both chains of ITMy from now.

Stage 1 Feedforward (HEPI-L4C to coarse actuators (stage 1)):
Transfer functions from the coarse actuators (Stage 1) to the HEPI L4C were measured to evaluate the "feedback path" (on the HEPI-L4Cs) once the feedforward controller is engaged. Coherence is bad in the [100m;700m]Hz due to a weak drive (needs to be redone). Transfer functions were measured with:
- No HEPI control
- ISI damped  on both stages

In the attached figure H1_ISI_ETMY_TF_FF01_X_2012_11_06.fig, few TFs in the X direction are presented:
- the ground path (HEPI-L4C to ST1 T240) - No drive
- the force paths F11 and F10 (coarse actuators to Stage 1 T240 and coarse actuators to HEPI L4C)
- the feedforward filter (Ground/force + fit filter)
- the "Open loop" - Feedforward filter x Force path (F10)

The force path F11 (coarse actuators to Stage 1 T240) is pretty strong in comparison with the force path F10 (coarse actuators to HEPI L4C). Consequently, the risk of instability is low.  The reference signal (HEPI -L4C) is lightly changed by the feedback loop (F10 x FF). F10 x FF is always far below 1 (The peak at 0.14Hz is due to the low coherence in the initial measurement).
 

Stage 2 Feedfoward (Blend {L4C + T240} to fine actuators (stage 2)):
In a first step, the stage 1 L4C and the Stage 1 T240 are blended at 2Hz (cf H1_ISI_ETMY_TF_Blend_FF_X_2012_11_06.fig in the X direction). Then, some simulations were performed to set the feedforward controller. In attachment H1_ISI_ETMY_TF_FF12_X_2012_11_06.fig, TFs in the X direction are shown:
- the ground path (ST1->ST2) - No drive
- the force paths F22 and F21 (fine actuators to Stage 2 GS13 and fine actuators to the (L4C+HEPI) blend)
- the feedforward filter ((ST1->ST2)/F22 + fit filter)
- The "Open loop" - Feedforward filter x Force path (F21)

The force path F22 is pretty weak in comparison with the force path F21. Consequently, the risk of instability is high. The "Open loop" - Feedforward filter x Force path (F21) shows that the feedfoward controller from stage 1 to stage 2 won't be stable. In this case, the reference signal (stage 1 motion) is too much changed once the FF controller is engaged

To circumvent the problem, the contribution of the stage 1 motion created by the feedforward controller can be evaluated and removed from the reference signal (cf block diagram). The "open loop' becomes (F21-F21 fit) x FF. I fitted the F21 path and re-evaluated the "open loop" in the X direction. With this strategy, the controller is stable in simulations but probably would not be experimentally. This approach seems tricky too implement experimentally.

The testing report for ISI-BSC1 (before closing the chamber) can be found at: E1201086-v1.

After Apollo finished with cleanroom mods and Kyle cycled the gate valves, I entered BSC1 for First Contact removal.  The FC sheets came off the faces of the optics (HR of ITM and AR of CP) with no problems.  I observed what we have come to accept as the standard amount of FC splatter/streaks after removal (~6 per face of various sizes).  I cleaned these spots up with acetone and optics wipes and resuspended both chains.  Awaiting a round of quick TFs to check for rubbing before remounting the door.  I also did a quick sweep of the chamber and removed the remainder of our tools/parts/covers. 

Removed the final (high-pressure) particulate filter from the purge-air supply skid -> Inspected element and replaced (P-SRF 07/25) -> Purge-air supply to LVEA was valved-out for ~3 minutes 

This report is for Friday, 07 Dec 2012. 
On Thursday, 06 Dec, I received a phone call from Janeen, Matt H. and Danny at LLO wrt contamination in the beamtube between LHAM2 and LHAM3. We discussed methods for mitigation and they asked if we could go in and make an inspection of the beamtube between WHAM2 and WHAM3. After a brief discussion with Michael L. at morning meeting, Cheryl and I planned and executed an incursion.

After gathering materials (Stinger, Cheryl's good camera, alcohol, wipes, etc)and garbing, we carefully entered HAM3 since we figured the "cat eye" baffle gave us the best shot at getting into the beamtube without having to remove a baffle. First, we inspected the optical table and its contents. Next, we looked at the bellows convolution and the flange area. Then, we climbed through the baffle aperture and proceeded to "walk the grid" down to HAM2. Cheryl took pix when we found anything interesting (and I'm sure she will attach some when she gets a chance). Once we were at the HAM2 baffle, we looked at the flange area and the baffle surface then turned around. On the way back to HAM3, we paid special attention to the overhead nozzles where conflats are attached. Below is a list of our findings.

-Optical table: particulate contamination on table and optics
-HAM3 bellows convolutions: white speckles, some short white fibers, unknown "dust"
-HAM3/manifold flange: flange surface covered in fine "dust", large piece of glove
-Manifold bottom half from HAM3 to HAM2: white specks and larger white "fluffs", a small "pile" of stuff that looked like baking soda, a couple of short red fibers
-HAM2/manifold flange: flange surface covered in fine "dust", "fluffs" under baffle frame
-Nozzles on manifold top: fine gray patina

We mitigated where we could by wiping up white specks and fluffs along the bottom of the manifold. The HAM3 bellows convolutions were wiped as well. 

We'll continue to investigate the situation but use the H2 manifold for compare/contrast.

out backup server crashed, I have just rebooted it to permit disk-2-disk and disk-2-tape backups to continue.

[Cheryl, Deepak, Luke, Giacomo]

Yesterday morning Cheryl was helping Jodie inspecting the beam tube between HAM2 and HAM3 for (lack of) cleanliness.

Deepak and Luke assembled the viewport replicator using one of the HAM1 doors as a reference.

Using a temporary steering mirror I aligned the visible laser pointer to two iriris previously placed iusing the IR beam (one ~20 cm before IM4 and the other after PRM surrogate, pretty much at the edge of the table). I used it to align all the auxiliary beams (froward and backwards) in transmission of IM4. (note that initially I used two different placements of the laser for the forward and backward beams; later, I found a location from which I could inject the visible laser in the forward direction, use the reflection off of PRM as a backward beam, and align all beam paths at the same time).

After a late lunch, we all worked at refining the beam alignment and optics positions, and aligned the two beams that go towards the HAM2 est door using references on the table. We then moved the viewport replicator from HAM1 to HAM2 and confirmed that the beams go through the right viewport pretty much in the center. Further adjustment left to Joe, that is more familiar with the IO tables and can tweak the exit beams at his will.

Auxiliary beam paths centering as of now:

- MC2 transimitted: aligned

- MC REFL: ok down to the exit of the second periscope. Needs to e pointed to the right viewport from there (using vewport replicator)

- IM1 transmitted: not aligned. Needs to e pointed to the right viewport using vewport replicator

- FI forward rejected: not aligned. Will need to be if the beam dump (currently in C&B) is installed, otherwise we move the steering mirror away and it lands on a SiC baffle.

- IM4 forward transmitted to IO QPD: aligned

- IM4 forward transmitted to ISS PD: aligned down to last optic (ISS PD not on the table)

- IM4 forward transmitted to IOT: aligned (exit point to be tweaked?)

- IM4 backward transmitted to IOT: aligned (exit point to be tweaked?)

- REFL beam: aligned to HAM1/2 septum viewport.