Rebalanced the ISI and ended up removing 0.8lbs and moving other.  Not too bad and a well within spec lock/unlock with worst shift of ~400counts (1600 spec.)

The ISI is unlocked and SUS has now unlocked the SUSes and we'll set up for TFs tonight.

Oh yeah--Dusts               0.3          0.5

Clean room before         0             0

Chamber  Before Work  270       130

Chamber After Work       1200        430

8:55 am, Arnaud to CS VEA, HAM3 B&K hammering MC2.
9:00 am, Kiwamu to CS VEA, HAM2 area work.
9:20 am, Andres to CS VEA, deliver laptop to Arnaud.
10:00 am, Calum, Kate and others to CS VEA, Work in and around BSC2 and BSC3.
10:00 am, Nichole to CS VEA, work around HAM4.
10:07 am, Richard to Y-END VEA, SLR camera work.
10:12 am, Matt to CS VEA, HAM3 area work.
11:18 am, Dave from CR, Y-END suspension models reverted back to RCG 2.8.4
12:13 pm, Jordan and Paul to Y-END VEA, work on PEM accelerometers.
1:05 pm, Matt to CS VEA, Work HAM5 and HAM4.
1:10 pm, Filiberto to CS VEA, HAM4 and HAM5 RTD work.
1:20 pm, Hugh to CS VEA, HAM3 and HAM4 work.
2:05 pm, Travis to X-END VEA, p-cal work.
2:22 pm, Corey to CS VEA, deliver a laptop to Hugh.
2:45 pm, Robert and crew to CS VEA, tour.
3:00 pm, Jeff to X-END VEA, photograph PEM equipment, spike seen on FOM.
3:33 pm, Michael to CS VEA, quick tour of work inside of VEA.

Attached are the spectra from last night TFs from HAM4.  SR2 as well was undamped and the extra wiggles are right where the SUS resonances are positioned (VC-APele.)  Otherwise these look about as clean as has ever been seen for HAM4.

The ISI is now locked for First Contact.

The following cables at HAM2 were checked:

ISC_243 PSL SM2 QPD. Feedthru D4-3C2
ISC_244 Picomotors. Feedthru D6-F10

ISC_243 was checked at IOT2L cable end. Cable is currently disconnected since table is temporarily moved.
ISC_244 was checked at IS_R4 rack. The QPD Amp chassis was powered down before disconnecting cable at rack side. 

All cables checked out. All cables were reconnected and electronics powered on.

Filiberto Clara

As part of the flurry of activities yesterday, I took TF's on the HAM5 ISI. They look messy, but I realized when I got in this morning that some of the suspensions were not damped, so I think I understand why my data looks bad. There are extra peaks that look like suspension resonances, but the responses look kind of like L1 HAM5, if you squint and ignore some detail.I've attached images for my TF last night (first 2 pdfs), and my best guess at the equivalent at LLO (second 2).

Additionally, we had an actuator that was plugged in backwards ages ago, that we had fixed by adding a gain of -1. Somehow this electronic fix had disappeared, so one of the actuators shows a -180 phase. The plan was for Fil and I to go in, take the plug apart and fix this at the chamber wall, because accessing the cable on the actuator is almost impossible. But, it turns out that the planned fix involved cutting the cable, and we don't have length to spare on this one cable, it barely reaches the flange uncut. So, I went in and unplugged the cable and replugged it correctly, completely blind. Only took about an hour. 

Did continuity test on TCS RTD (Resistance Temperature Detector) for HAM 4 and 5:

HAM4 Flange D6-3C1 (air side)
HAM4 Flange D3-3C1 (air side)

The following pins at each connector are tied together:

Pins 1&2
Pins 14&15
Pins 11& 12
Pins 24 & 25

Read ~110ohms across:

Pins 1&14
Pins 11&24

All within spec.

Filiberto Clara

Both HAM3 suspensions are locked. The wafer for mobility experiment placed back into position. Vertical wafer holder (no wafer) placed into position. 1" optic placed on the side of the MC2 cage. Optic still has FC on it. ISI now ready for balancing

Changed out ISI coil drivers in SEI rack C1 with modified chassis with SUS Watchdog Interface and connected coil drivers to watchdogs.

Replaced 
S1103301 U6 with S1103303
S1103316 U4 with S1103309
S1103361 U2 with S1103356 

Richard Savage, Michael Vargas, Forrest Shriver, Darkhan Tuyenbayev.

Pcal transmitter module was delivered and installed on top of the pylon at the EndX station.
Pcal receiver module parts were delivered to the EndX station. The module was assembled and installed into the pylon, but not yet aligned.

Port (window) shutter was installed on the receiver side.

Enclosure of the receiver module is currently not installed. Proximity sensors for receiver module enclosure have been tested, but were removed for additional tests.

Jim and Dave.

We noticed that the h1iopsusey ADC bit (3rd bit) in the STATE_WORD has been coming on since wednesday evening. The IOP model was upgraded to RCG2.9 at noon on wednesday. We downgraded the IOP model to RCG2.8.4 this morning, and took the opportunity to also downgrade the h1susetmy and h1sustmsy models. No DAQ restart was required.

Calum, Kate, Rich A, Nichole, Betsy

Reporting for the team last night:

While in the corner BSCs for First Contact work, we also detached the BS elliptical baffles which were mounted to the BS SUS structure.  We staged the new gold wire-protection baffle parts and ran through how they attach.  We will wait until the BS optic has First Contact on it before attaching the new baffles and reattaching the elliptical baffles.

Calum, Kate, Rich A, Nichole, Betsy

Reporting for the team last night:

After collecting all of the required equipment, we started the ITMx First Contact cleaning at ~5pm yesterday.  We used the spray cone to apply a nice coating to the CP-AR and then to the ITMx-HR.  When we did the ITMx-HR we had to slide the ACB wedge part way out in order to have the ACB swing back in such a way to not interfere with the spray cone attached to the front of the QUAD structure.  Reportedly there is a new cone somewhere that does not interfere with the ACB fully swung back.  Will continue tracking said cone.  The plan is to clean the chamber and continue with other mechanical closeout items before pulling the FC and closing the chamber door (the typical procedure).

Prior to starting the First COntacting of the ITMx-HR surface, we attached the green lantern fixture and inspected for particulate on the surface of the optic.  A few weeks ago, we used the fixture to spot ~2 particles per sq. inch on this surface.  Since then, much in-chamber activity has taken place.  Yesterday, we spotted ~5-10 particles per sq. inch.  We should inspect after we pull the FC.

K. Izumi, Matt
The bypass mirrors and the irises have been removed from HAM2s 2 and 3. The MC3 AR baffle (I believe its called) has also been put back into position

Particel counts:
HAM3: In cleanroom
0.3um...10 counts
rest..... zero

In chamber
0.3um.....30 counts
0.5um..10 counts
rest..... zero

HAM2:
In cleanroom
0.3um....10 counts
rest..... zero

In Chamber
all..... zero

Filiberto, Rich

Motivated by the observation of oscillations on an AA/AI circuit board when loaded by a long cable in the LLO ESD system (and per Rana's suggestion), we performed a stability analysis on the version 6 AA/AI circuit board.

A version 6 AA/AI board was loaded with ~120 feet of typical twisted pair.  The output of one channel of the circuit board was driven through a 470 ohm resistor using a function generator running a 1kHz square wave at 2Vp-p.  The cable-loaded opamp output was then observed on an oscilloscope to watch the perturbed response of the opamp.  By observing the opamp output at the edges of square wave, any tendency toward instability can be detected as excessive ringing.  These observations were done while varying the output DC level to check if the stability is a function of output DC level.  Actually, the DC variation test could be flawed in that a significant load was present from the 470 ohm resistor in series with the function generator.  A better test would have been to AC couple the function generator to avoid being mislead by the excessive loading of the 470 ohm resistor in series with the function generator.

No tendency to oscillate was seen on the version 6 circuit boards.  As a further test, the cable loaded opamp was loaded with an additional 0.22uF fixed capacitor and no instability tendency was noted.

As a sanity check, we took a version 4 AA/AI board and found it unstable with even a moderate cable load (60 feet vs. 120 feet).  Even a ~12 feet of RG58 was enough to get the version 4 board to show instability at 4MHz or so.  

It looks like the data from the ETMY STS is not getting saved to the frames correctly. If you look at the attached plot, it shows an ASD of the ETMY STS. I've plotted  both the data (5 minutes of data starting at 17 July 00:00 UTC) from the SENSCOR channels (H1:ISI-ETMY_ST1_SENSCOR_GND_STS_X/Y/Z_FIR_IN1_DQ) and ISI-GND channels (H1:ISI-GND_STS_ETMY_X/Y/Z_DQ) - no filters have been applied, this is just the raw data. The SENSCOR channel looks fine so we do not think the sensor is broken, but the data isn't being saved correctly to the H1:ISI-GND_STS_ETMY_X/Y/Z_DQ channels. 

Summary - Data is not being saved correctly to the H1:ISI-GND_STS_ETMY_X/Y/Z_DQ channels.

Enough of the alignment of the corner station optics had been completed enough to free up the BS and ITMy for chamber closeout preps.  So, I locked the ITMy test mass and CP mass in prep for First Contact cleaning.  Although the ISI is not yet locked, we all decided it was OK for me to lock the BS optic and it's PUM, so I did that too while I was in the BSCs.

Betsy, Filiberto, Rai, Calum, Rich

We successfully repaired two elements (1&5) that were shorted by one of the wires that suspends the compensation plate (CP) on ITMY.  Rai machined two tools (2mm wide razor chisel and a carbide cutting tool fashioned into another tiny chisel) for us to use to remove a small portion of the gold mask on the CP.  The tools worked very well and we were able to cut two ~2mm gaps in the gold traces thus eliminating the short circuit path.

Everything went well.  After cutting the gaps, we checked that each wire had proper continuity from the airside of the vacuum feedthrough all the way to each pattern on the CP ESD mask.  From the airside of the vacuum feedthrough, each of the 5 center conductors were HIPOT tested at 1kV to chamber ground for 1 second with the tester set to alarm at 300uA.  The same HIPOT test was performed between each isolated shield and chamber ground.  All connections are normal.

There was a report of at least one problem with the 5-way coaxial connector on the vacuum side of the vacuum feedthrough that will require rework at a later date.  Once the majority of the doors are back on the chambers, there will be decent positive pressure such that the feedthrough can be taken off and the cable pulled through into the air and reworked in situ.  We have done this successfully on other similar connections.  Filiberto and I went through the necessary steps to repair that connector when the time is right.

Betsy is taking a couple of photos of the repair to be posted soon.