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.

Sheila, Alexa, Chris

We copied the safe.snaps for h1iscey and h1ecatx1plc2 from the Y end, did some replacements and restored them.  Chris also copied over the filter files from end X so we can attempt to lock the input alignment servos. 

I also installed WinSCP on h1ecatx1, it could not resolve host names but Cyrus is working on this.  We copied the autoBurt.req files from C:/SlowControls/Target/PLC1 PLC2 PLC3 into the target directory, so from now on we should have autoBurts for the X end beckhoff. 

We also cleaned up the h1ecaty1 directory. 

At 19:05 UTC

[Jeff K. Arnaud P.]

B&K hammer measurement on the ITMX suspension cage was completed yesterday while the ISI was floating. The corner cube left from alignment was removed before starting the measurement, and replaced by the protecting plate after. The corner cube as well as the screws are now on the floor in the chamber (cf 2nd picture attached). The protecting plate of the reaction chain test mass was removed and replaced after the measurement.

The tri-axis accelerometer used has been mounted on the side of the structure, with the axis oriented as described in the picture attached. As the previous measurement of ITMX, two locations were chosen for the hammer hit, one on the front (labelled as the Y axis of the accelerometer, corresponding to the sus axis "longitudinal"), and the other one on the side of the optic (labelled as the X axis, or "transverse" for sus axis)

The measurement was taken with the usual Pulse software, using the templates from the last ITMX measurement (cf alog 7762).

Results in the pdf attached are described page by page below :

(1) X-Y-Z response to X excitation, suspension unlocked, isi unlocked, in chamber, vibration absorbers on

(2) X-Y-Z response to Y excitation, suspension unlocked, isi unlocked, in chamber, vibration absorbers on

(3) X Resp to X excitation : comparison between b&k ISI locked (LLO ITMY (red) + LHO ITMX test stand (green)) and ISI unlocked (LHO ITMX in chamber (blue))

(4) Y Resp to Y excitation : comparison between b&k ISI locked (LLO ITMY (red) + LHO ITMX test stand (green)) and ISI unlocked (LHO ITMX in chamber (blue))

Note : even though it hasn't been exported, the coherence looks really good in the pulse raw data.

The results from yesterday afternoon are showing a lot of high q resonnances and noisy data in Y direction, which is not the response we would expect to see, cf (2). Also we can see the overall magnitude of the measurements with the ISI unlocked is below the ones with the ISI locked by an order of magnitude cf (3) and (4). The exported data was compared to the pulse data, to make sure it's not a calibration factor issue in the process.
It seems unlikely that those differences are due to the state of the ISI, but since we don't have other data comparing b&k ISI locked/unlocked (or at least I didn't find any), it is hard to tell. Tomorrow, we will double check the status of the ITMX suspension cage, to check if we didn't forget to remove something that won't stay permanently, that might have caused the peaky resonnances. Also, it will be interesting to reproduce the test when we will have a chance at ETMX (seems like next week, when all the work will be done on the suspensions after discussing with Keita), see if we get the same drop in amplitude.

TF's running on on ITMX ISI overnight (on opsws0), but a range of motion test will run tonight before TF starts. This will probably delay the completion of the TF until mid-morning. Local basis test was completed earlier this afternoon.

Stefan, Sheila, Dave

we took the opportunity of today's upgrade to time how long it takes to recover the PSL when the front end models (ISS,FSS,PMC) are restarted. This data is requested as input to the decision on whether to install Dolphin IPC into the PSL front end.

We recovered the PSL in approximately 30 minutes. The shutter was opened through the laser MEDM screen and did not require entry to the Diode room to press the shutter button on the Beckhoff console. Sheila completed the recovery.

Jim and Dave. We took the opportunity to rebuild the IPC file from scratch during today's RCG2.8 update to clean out orphaned channels accumulated as models have evolved over the past 6 months.

Here are the results

(Koji, Jeff B., Jeff L.)

The first contact protecting the optics was removed.  Koji put the eLIGO DCPD diodes into the aLIGO OMC and tested them in-situ.  New QPDs are being used.

The OMC was installed into the suspension and some of the cables were attached to the OMC.  Some other cables are finishing C&B and will hopefully be ready Wednesday.  The OMC will be balanced (masses added) once all the cables are attached.

After Jim locked down the ISI, we installed temporary TMS telescope alignment stabilization tooling (D1100613) so we can work conveniently without shaking things too much.

We replaced four out-of-spec washers in TMS seismic safety stop structure (D1001781) with the right ones so that conical washers can be oriented in the specified directions (which didn't change the floppiness of the structure that much).

We also replaced two class-B pear shaped links for the restraint chain with the class-A ones.

Tomorrow, SUS will align ETMX to compensate the PIT angle caused by the weight of the ETM first contact.

They will also pull first contact from ERM and two viewports but not from ETM.

Then ISC will start injecting laser into the chamber.

I did an autoburt of h1pslpmc, h1psliss, and h1pslfss this morning to 00:00 11/11/2013 after the RCG update. They came back fine (we are still in the state where the PMC trans PD is wrong), so I haven't updated the safe.snaps.

The ref cav alignment also seems to be off in pitch again, I noticed this a few days ago. 

(Alexa, Sheila)

We turned the ISCTEX prometheus laser on. With the current at 1.810A, we measured the power along the 532nm path. In particular:

• Immediatly after the laser: 55mW
• After the first Faraday: 46mW
• After the EOM: 44mW
• After the second Faraday: 38mW

Please remember to communicate with the control room when you are embarking on work in the VEA's.  There were enough people at BSC3 today to make a Shriner's convention, but ops didn't know who and when.  This makes it difficult to respond to questions that we receive in the CR.  Another nag -- carpool on trips to the outbuildings with site vehicles when possible on days like today when both end stations are in play.

Site support:
** The rug vendor now arrives early on Tuesday mornings (~7:00 AM)
** The office trailer came off the gravel today and is resting on the roadside near the front of the corner station.  It's scheduled for final departure near 9:00 AM tomorrow.
** Lots of noisy activity on the corner station roof today 
** Insulation removal continues on the near section of the Y arm (Y1).  The control room strip chart now reads the Y1 vacuum.
** There appeared to be no Praxair delivery today, but I may have missed it.
** Update of the GC switch occurred.  Network and phone outages appeared to cease at midday.

Interferometer activities:
** Apollo worked on viewports at EX this morning.  Alexa and Sheila removed one side of the first contact on these this afternoon (no work permit on this because the network was down.  John W cleared the work).
** LVEA has been in laser hazard all day.  EX entered laser hazard near 3:30 PM.
** Kyle is delivering instrument air to the controls of GV6, which remains hard closed as of 4:00 PM.  He'll leave it closed tonight.
** EE crew grounded power supplies at EX this morning.
** Rich A made measurements on an ISCT1 PD, and he checked ESD cables at BSC3
** Patrick relocated the dust monitor code
** Dave and Jim installed RCG 2.8, which seems to be working properly
** When the PSL controls went down this morning because of the upgrade, Sheila did a burt restore to re-lock the mode cleaner
** Work continues at HAM2 (possibly the PD array installation which was scheduled for today).

Alarms:
** Lots of CDS alarms due to system work (none were surprising)
** Occasional dust alarms in areas where work was occurring.  There was one episode of 80,000(+) 3um early in the afternoon at BSC3 that was not repeated.