[Jim W. Travis S. Arnaud P.]

Today, and following yesterday's results we went in BSC3 chamber to take a new set of b&k measurements, and did a series of tests described below :

Test1 : X&Y hit ISI locked

Test2 : X&Y hit ISI locked with dog clamps tigthened

Test 3 : X&Y hit ISI unlocked with dog clamps tightened

The attached pdf is showing good and consistent results in both X and Y directions, for the 3 tests. See pictures for axis.

Several things to notice and conclude :

-The difference between ISI locked/unlocked seems only to affect the anti-resonnance at around 30Hz. Meaning, there's no need to take b&k measurement in chamber, but test stand is sufficient (at least for the quads/bs)

-Tightening the dog clamps didn't change the response above 30Hz

- None of the results from yesterday were reproducable

Results and scripts were commited under the svn

I've replaced the "Z" plate of the PR2 scraper baffle with the reworked version. This went very smoothly and I was able to do it without removing the assembly from the chamber. The new installation cookie cutter looks like it will work well and not interfere with any dog clamps however there is a table mass in the way of the correct baffle position. This mass seems to be in a different place than the one at LLO that should not interfere.
A few notes for the repeat job at LLO:
Tools required; 1/8, 9/64, 3/16 Allen keys
(It is helpful if the 1/8 key is cut down on the short end but not required)
-It is not necessary to completely disassemble the baffle assembly. Only the top side needs to be removed, however it is helpful to loosen all screws that don't need removal.
-After removing the old plate set it down on the HAM table in the correct orientation to remind yourself how the new one goes in.
-Leave all screws loose until the assembly is completed and then tighten.

While looking at TMSX medm screen, I realized that huge AC values were sent to the dac due to damping.

It seems like the damping was not in its right state because the input osem calibration filters were not engaged.

The picture below describes what filters to engage for the damping to be working : There's a "to_um" to engage at the osem bank, and a "from_um" at the damping bank to compensate for the first one. It won't work if only one of them is engaged.

Measured and adjusted the RF power levels associated with the LO drive to the ASAIRA and ASAIRB demodulators (18, 45, 90 MHz)

45MHz to LSCAIR-A 
Changed pad at input to distribution amp to bring the RF drive level down by 3dB as measured at the demodulator end of the LO cable.  The pad was 2 dB, now it is 5dB.  The measured RF drive at the LO jack on the demodulator was 13.0dBm, and has now been reduced to 10.0dBm

18MHz to LSCAIR-B
Added at 2dB pad to the RF distribution panel such that the measured LO at the demodulator LO input is now 10.0dBM

90MHz to LSCAIR-B
Measured the LO drive at the demodulator LO input and found it to be 10.6dBm.  Decided to leave it at that as it's close enough.

Here is the list of DAQ INI files which have none or only one (ODC) channels in the DAQ science framed. Chris Wipf is working on the ISC models and Jeff K is working on the SUSAUX models. The ones which I did not anticipate are the OMC and SUSIM models.

h1iscex front end lost communication with its IO Chassis at 16:14. The system was recovered by power cycling the computer and IO Chassis at 16:56.

TF's will be running on ITMX. TCS is in chamber right now, so we have a script set to run after their expected exit from the chamber. Hugo will check watchdogs remotely after TCS leaves, to make sure measurement goes through.

Dust monitor 9 briefly dropped in and out of communication three times
Multiple brief EPICS gateway drop-outs reported by the alarm handler

Jim W. taking measurements on ITMX
Cleaning around HAM 6

09:20 Call from gate, answered multiple times loudly, no response. Could hear engine running, but couldn't see anything on the camera through the fog. They eventually hung up and did not call back. They may have been here to pick up the trailer, which was scheduled and is now gone.
09:39 Betsy W., Travis S., getting ready to go to end X to take in chamber pitch measurements of ETMX
09:41 Small clean room moved into beer garden, dust alarms on dust monitor 5
09:56 Jeff B. working on OMC in clean rooms by HAMs 4, 5 and 6
10:36 Kyle R. opening GV6, may make loud noise as it cams open
11:35 Dust alarm at end Y may correspond with alarm for Y end cleaning area roll-up door open
11:48 Mitchell R. out of LVEA, was helping Peter K. with cabling near HAM2
13:07 GV6 opened
13:31 Mitchell R. getting parts from the north and west bay of the LVEA
13:31 Jeff B. working on OMC in clean rooms by HAMs 4, 5 and 6
13:45 Mitchell R. done getting parts
13:49 Sheila D. transitioning end X to laser hazard
14:11 Justin B. transitioning the LVEA to laser safe
15:00 Safety meeting
15:57 Jeff B. working by electronics rack at HAM6
16:01 Dave B., Jeff K. restarting reverted h1susim model

All 8 of the photodiodes in the photodetector array check out electrically.  This was done using the
diode tester function of a multimeter.

Initially a problem was thought to exist with 2 photodiodes - top row, right most two - but this was
traced to a problem with the cabling.  The cabling was measured with the TDR, which seemed to indicate
that the problem was either at the flange or on the in-vacuum side.  Thinking that the seating of the PEEK
2-way coax cables was not good enough, the in-vacuum cable was removed and reseated (thank you Mitchell).
The TDR yielded the same result.  A check of the 2 photodiodes with another set of cables indicated that the
photodiodes were good.  Looking at the in-air cable, which was removed and reseated, two of the connections
came good.  The entire cable assembly (S/N S1301015) was replaced (with S/N S1301016) and all connections
tested okay.

Re-doing the diode test measurement confirmed that the 2 diodes initially thought to be suspect were
okay with the replacement cable.

J. Gleason, P. King

J. Kissel, D. Barker, R. Bork, A. Pele

I had identified the problem (not aLOGged, appeared yesterday afternoon after the RCG upgrade) with the HAUX models early this morning to be a few, expected unconnected and cross-wired parts. This was because Dave had forgotten that I'd advertised the HAUX to be under-construction, and in his sweeping effort to recompile all models yesterday, accidentally compiled and installed this under-construction, known-to-be broken model. Honest mistake.

I patched up the under-construction model to get it working enough for basic operation early this morning, but then the temporarily-fixed model didn't compile because of RCG issues with bus selectors and creators. Rolf's currently hard at work on it, but in order to make progress with the installation of PSL ISS Outer Loop PD, we've just reverted to the known working svn copy of the model, which compiles just fine with Matlab 2012b, and RCG 2.8 (i.e. all the new stuff).

The svn copy of the model has been compiled, installed, restarted, and restored, and damps nicely as expected. The alignment offsets have been restored to whatever was in the safe.snap,
IM1 P   2330
    Y   -170
IM2 P   -1880
    Y   -300
IM3 P   2850
    Y   300
IM4 P   -2420
    Y   -980

Arnaud's gunna grab some trend data to compare against what alignment offsets were established earlier in the week, to see if they're different; he'll post a comment shortly.

Prior to the OMC glass bench installation, the OMC DCPD preamps (D060572 SN004/005) were tested in the H2PSL enclosure.
The results are almost identical to the ones seen in LLO. Now the preamps are attached to the OMC suspension.

- Transimpedance measurement

This preamp uses a resister as a transimpedance (i.e. current to voltage conversion).
The transimpedance can be switched by a 5V relay with the "ZSwicth" terminal.
The resister values were read by a multimeter at the diode (between Cathode pin and GND pin).

Preamp SN004
ZSwitch=L 100.8 Ohm
ZSwitch=H 400.9 Ohm

Preamp SN005
ZSwitch=L 100.2 Ohm
ZSwitch=H 400.0 Ohm

- Transfer function measurement

The voltage transfer function of the preamps are measured by applying the source voltage
to the lead pins inserted to the PD connector. The source amplitude of 20mV was nominally applied.
For the linearity check (as per request by Keita), the measurement with a half amplitude (10mV) was
also done. ZSwicth does not change the transfer function as it only swicthes the transimpedance resisters.

Page 1 of the attached PDF: linearity check
The TFs with the 20mV and 10mV amplitudes matches in 1% in amplitude and 1deg in phase.

Page 2: Consistency check
Comparison with the circuit model (with nominal circuit parameters) by Zach Korth. The measured value is
consistent with the circuit model. Of course, they don't match perfectly as the actual circuit parameters are different from nominal.

Page 3: Empirical ZPK fit
For the modeling purpose, the TF with the 20mV excitation was fitted using liso. The fitting was done with precision
of 1% in amplitude and 1deg in phase. The list of poles, zeros, and gain is in the page. 

Page 4: Current noise 
The input-referred current noise was measured with the two impedance settiings. The noise expectations from LISO
model (by Zack Korth) is also shown. As seen in LLO, we have some discrepancy from the LISO model at the low and
high freq edge. For the low impedance (=high beam power) mode, we can see the shot noise level of 35mA photocurrent
between 12-100kHz.

Page 5-8: Same analysis for the preamp SN005

Kyle 

Applied 40 psi (indicated) to underside of GV6's piston, increased to 45 psi after ~60 mins and then 50 psi after 90 minutes -> GV6 opened ~30 mins later

Attached is a trend of the IPSs for ETMx back 15 days showing the Actuator attachment followed by the IAS-is-good time for ETMx, and the HEPI locked period during the Dome install & work platform removal.  The HEPI is then unlocked and finally yesterday is seen when JimW went in to lock the ISI for TMS work.  Jim reports he had to hang a bit on ISI Stage0 (HEPI) and there is a good shift on the trends at that time.

So the HEPI aligned for IAS numbers are:

The calibration for these channels is 655cts/0.001" so more than a couple 1000 counts starts getting significant for aligned position particularly for Yaw.  In light of this, note on the trend where H1 sees a 2500ct shift following the ISI lock.  If this were seen on all four corners acting together, this move would approach 50urads.  As these are in local coordinates and all are negative, this is more like a de-stressing manifestation.  If corners 1 & 3 were negative and the other two corners were positive, we might be getting some real rotations.  As it is, taking the signs into account, the shift that appears large on these plots is just 7urads.  For the apparently large vertical shift, differentials would be tilts.  The largest being 500cts gives about 0.025mm at the pier or ~9urads.

Bottom line, alignment should still be good.

While setting the ETMx pitch offset for the TMS alignment, I mapped the ETMx pitch alignment offset using my alignment equipment.  Attached is a .txt file of the raw data points.  Bottom line is:

• The sign is correct: + offset pitches the ETMx down, - offset pitches the ETMx up
• The offset does not pitch the ETMx 1:1 when measuring the actual pitch with the laser autocollimator

I set the ETMx pitch alignment offset to -291 for the TMS alignment (as discussed in Betsy's alog below).  This puts the ETMx exactly where it needs to be for the TMS in-chamber alignment.  Please do not turn off the alignment offset as this will cause an error in the TMS alignment.  Thank you.

BSC-ITMX TF measurements performed overnight last night, and today, all crashed. Crashing point changed every time in a random manner.

The matlab error reports an issue in awgstream.m which lives in the matab folder.

We are now running a set of test TF, with the master switch off, on ITMX from matlab 2010a to see if the awgstream issues we are experiencing come from the recent Matlab update.

This measurement will take a couple hours and will not be perturbated by mechanical work (master switch is off).

This morning Travis, Jason and I made the ~last pitch alignment of the ETMx.  We also pulled the FC from the inside of the 2 East viewports and the ETMx CP-AR.  However, when we pulled the FC off of the CP-AR, the thin central portion of the sheet left segments of a ring around the center of the optic.  Par for the course.  And, of course, I could not get any good pictures of the feature so I'll attach a sketch shortly.  I'll get with COC to see what I should do - note, I cannot get the spray cone on to resheet the First COntact and start over, so either we'll need to live with these remnants, or I'll have to get crafty with a smaller cone.

But, back to the alignment - we aligned the ETMx to an offset pitch pointing such that when we pull the First Contact sheet from the HR surface, the optic bounces up to point the nominal pitch.  However, this does not help TMS with their alignment now.  After consult with IAS/TMS we decided to put the offset pitch onto the bias slider of the ETMx.  We have the range according to the uRad-calibrated bias slider, however Jason is going to go map it out and confirm the calibration of the slider with his optical equipment (still set up).  This should not take long, and he will leave the offset bias enabled for TMS to start their alignment asap.