Got the Corner1 BB Blade and Flexure Dampers installed.  Then B&K was performed w/ JKissel.  Two GS13 Can dampers (in chamber) yet to do.  North & South walls can be reinstalled, and once TMDs are re-tuned, everything else can be completed.

J. Warner, S. Appert, T. Shaffer

We had some unexpected time to work on HAM2 baffles after some FedEx kerfluffles, so Jim and I went into HAM2 with some freshly baked parts and an engineer (just in case things got out of hand). This work went really fast with the three of us and we managed to finish up PRM, the last beard baffle, align all of the panels we needed to, and then torque and cap everything. I went into the beam tube to work from there and to be the eyes to align, and of course, I wiped on my way out.

We left the table baffle that sits in front of PR3 off the table for now, but with the mounts bolted down. This way the other crews that still need to do work have a little bit of space to work and won't scratch anything, hopefully. To place this last panel will take only a minute or two so we can easily do it after the major work is all done.

Pictures to come.

Greg, Betsy, Travis, TVo

We locked down both ITM Elliptical Baffles suspensions and removed the box portion from BSC2 Stage-0.  Then we disassmebled the box portion and class-A preserved the re-usable hardware and parts for the re-work outlined in D1101806. 

The parts needed to finish the work is still in transit so we decided to stop at this point.  Once we get the parts needed, we'll build up the new box chamberside and slide it into BSC1 for continued installation.

Changes made to the IMs today:

• all alignment offsets set to zero(0)
• all alignment offsets saved in SDF
• all LOCK FILTERS filter outputs turned off on all IMs (IM4's were already off, so no change for IM4)

Current OSEM centering:

• IM1 has had it's OSEMs recentered
• still to center: IM2, IM3, and IM4

Alignment offsets on IM3 and IM4 pitch that were necessary for the first alignment to PR2 are better understood:

• IM4 pitch OSEM readback shows -4051urad with a zero alignment slider value
• IM4 pitch when the beam was aligned within a few mm of center on the PR2 iris was -2720urad
• the difference is 1331urad
• at PR2, a distance of 16.7m (approx. dist from IM4 to PR2, ignoring PRM), the IM4 pitch angle change of 1331urad shifts the beam by 22mm
• all other IM pitch OSEM values are less than 100urad from zero with a zero alignment offset
• this suggests that the current IM4 pitch value of -4051urad is pointing the optic around 67mm high at PR2
• this also suggests that IM4's pitch at zero alignment offset will need to be adjusted
• further diagnosis will require the beam from the PSL

TITLE: 10/25 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

14:15 UTC Peter to optics lab
16:11 UTC Jim, TJ, Steven processing baffle hardware
16:33 UTC Ed in CER, mods for all HAM ISI coil drivers
16:38 UTC Karen to mid Y
16:41 UTC Travis to bier garten to work on ITMX alignment
16:45 UTC Hugh to HAM4 to work on ISI damping
16:48 UTC Corey installing mirror for squeezer tip/tilt in HAM5
16:50 UTC Snowvalley here to see Bubba
16:53 UTC Betsy to BSC3
16:53 UTC Peter back
17:27 UTC Kyle, Rakesh WP 7189
17:27 UTC Karen leaving mid Y
Kyle craning cart over YBM
17:49 UTC Thomas and Greg to go into BSC2/3 to lock down ellipitical baffles
18:04 UTC Peter back to optics lab
18:11 UTC Fire department here to check on a box
18:50 UTC Jim, TJ, Steven done. Were unpackacking equipment in clean room near HAM2.
18:52 UTC Peter back
18:52 UTC Ken from Hanford radio here to meet with fire department about issue with RAFAR box
19:08 UTC Betsy and Travis out for lunch
19:19 UTC Hugh out of the LVEA
19:58 UTC Thomas done
19:58 UTC Peter back to optics lab
20:09 UTC Corey to HAM5 to continue work on tip/tilt mirror
20:48 UTC Betsy and Travis back to ITMX
20:55 UTC Ed to HAM2 to help Filiberto and Marc (pulling fiber?)
22:00 UTC Site weekly meeting
22:36 UTC Keita and Corey back to HAM5
22:47 UTC TJ, Jim, Steven done installing all baffles in HAM2 except table baffle. Done for day.
22:58 - 23:00 UTC Jeff K. retrieving B&K hardware from near HAM2

FAMIS 6546

Added 150 mL H2O to the crystal chiller.

The fault light on the diode chiller is not lit and the water level indicator on the controller screen indicates the water level is OK.

The canister filters appear white and free of debris.

FAMIS 6921

ETMY_ST1_CPSINF_H2 is elevated.
ETMY_ST2_CPSINF_V2 is elevated.

Corner station plots are not valid due to planned engineering.

Yesterday Travis and I installed the Non-Magnetic Blade Dampers and the Bounce Roll Dampers on the UIM stage of the main ITMY chain.  This required the removal of the unused copper damper shafts (as per procedure to compensate for the added weight).  We then checked and realigned the ITMY reaction chain CP since we had reason to believe that it was mis-pointed in pitch relative to the main chain (alog 33809).  Recall that the CP-HR surface should be co-aligned with the ITMX-AR surface.  Since the ITMY was slightly misaligned on the oplev (venting or not well aligned recently...), we centered it via some smallish bias.  The new ITMX BIAS for our in-air alignment is:

P = -56  (was for Aug locking P = -37)

Y = -176  (was for Aug locking Y = -207)

With these, one of us then walked down to the Y-manifold and hollered suggestions back down the tube while the other one of us adjusted the reaction chain at the PUM to steer the CP-HR to overlap with the ITMY-AR.  After a few iterations, we managed to get the beams to overlap.  We fine tuned it with P = -150 on the reaction bias slider.

Likely the commissioning team will need to move the ITMY back to either where the sliders started, or another slightly new pointing, but we could use these bias values to point the CP to follow the ITMY later.

looks like h1ecaty1 needs a restart.

ECR1500397
WP 7188
FRS 4504

Installation of the Hardware Watchdog System (HWWD) update.

Yesterday the ITMY/ITMX ISI coil drivers were replaced.

S1103345, S1103335, and S1103350 in SEI-C4.
S1103357, S1103341, and S1103334 in SEI-C6.

New units have the following modifications complete:

1. HWWD keep alive BNC back panel modification and new power board 
2. E1300535: DCN for SEI Coil Driver regulator transient protection
3. E1100821: Change notice to bring ISI Coil Drivers to a rev. v2
4. Check front panel reset switch is correctly wired.

New units installed:

S1103340, S1103364, and S1103339 in SEI-C4
S1103358, S1202291, and S1103307 in SEI-C6.

New coil drivers require a ~15V signal on the BNC connector located on the back panel. Signal comes from the D1300642 HWWD chassis located in SUS-C6.

All HAM and BSC2 coil drivers will be checked/modified to ensure modifications listed above are complete with the exception of the back panel BNC modification.

I don't know if we're getting better and better to find defects in the mirrors, maybe the flashlights we use are getting brighter, but anyway our iLIGO 2" optics all have some contamination or defects (I think they're defects), some much worse than the others.

We have total of 7 such iLIGO optics at hand, we inspected them all, and chose one as relatively good, another one as OK. These are to be installed for SQZ path.

Attached are the cellphone pictures of these optics. View them in full resolution to observe the defects/contaminations that are marked by yellow closed curves. I haven't noticed all of these until I took pictures. But Optic 1, 2, 6 and 7 were clearly worse than 3, 4 and 5 by just visual inspection.

Green closed curve on Optic 2 show what I think is NOT on the HR.

Optic 1: Lots of what seem to be scratches and oval dimples to me. I tried and failed to move/wipe using dry Q tip. If you're VERY careful in your lighting the  oval dimples looks oval to naked eyes.

Optic 2: Lots of what seem like deep scratches.

Optic 3: Defects are smaller and fewer. This is the best one.

Optic 4: Not the best. This is the second choice.

Optic 5: Many things at around the center though they are smaller than the worst ones. Somewhat worse than Optic 4 to me. Three deep dimples at the edge at 120 degrees angle.

Optic 6: Big things at the center.

Optic 7: Marginally better than optic 6.

Removed the damaged glass from OMC REFL Beam Diverter Dump (3-large pieces removed & smaller shards/dust removed on best effort).  New glass was installed.

(Corey, Keita, TJ)

Yesterday (Mon), I gathered (4) HR mirrors for installation into Squeezer Tip Tilts (These are E040516iLIGO E040516's).  I basically applied First Contact (on both sides of all optics) & left them over night.  Unfortunately, this morning after TJ & I removed the First Contact, the HR surfaces didn't look very clean.  Keita came to put a second pair of eyes on them, and also felt they were not acceptable.  So, he applied First Contact to them + the remaining other (3) spares for a total of (7).  Documents say they should cure for atleast 4hrs before removing FC, but Betsy said they are generally good after an hour.  So in the afternoon, we removed the FC and inspected.  Out of the (7) Keita worked on, (2) of them were OK/acceptable.  So we are going to go ahead and use these for the HAM5 &6 Tip Tilts.

(The other E040516's were photographed by Keita.  We probably no longer have any usable spares....other than 3IFO.)

Keita took the (2) acceptable mirrors, cleaned their not-grounded (i.e. clear) barrels with Acetone and then reapplied First Contact on the optics for their installation/transport.  

The plan is to install one or both of these in the Tip Tilts tomorrow (Wed).

Corey and I damped output arm MC baffles. The figure shows the locations of all dampers. We mainly followed details in: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=38757  but placed an extra (fourth) cork at the top of each baffle, and damped one panel gap on the outside, where most of the gaps are not as wide because the bolt spacing is closer.

J. Kissel, T. Sadecki

Travis and I spend the day characterizing the violin modes of the new fibers on the new ITMX main chain, after confirming it was "mostly free" last week (see LHO aLOG 39111) with the same HeNe laser + QPD setup as described in LHO aLOG 38857. Processed data to come, but I'm building up quite the backlog... stay tuned, and thanks for your patience.

F. Clara, J. Kissel, R. McCarthy, G. Moreno

After 
    - sorting out confusion with drive electronics (thanks Fil and Richard!)
    - a few iterations of tuning transfer function amplitudes, 
    - realizing that the eddy current damping magnets may be interfering with / over damping the SUS, 
    - a tweak of a rubbing OSEM, and finally 
    - diagonalizing the longitudinal transfer function (i.e. actuating in Yaw to compensate for the SD OSEM's offset from the center of mass)
Gerardo and I have completed the first set of in-air, driven transfer functions with the recently installed OSEMs on the OFIS. 

Attached are the results, and the resonant frequencies are as follows:
    DOF          Freq (Hz)
     L         0.625 +/- 0.01
     T         0.625 +/- 0.01
     Y         1.039 +/- 0.01

This confirms that AOSEMs, driven with standard 16 bit, 20Vpp DAC, through a (LIGO) standard AI chassis, HAM-A coil driver and ISC/US-style satellite amplifier, pushing 3mm DIA x 6 mm LEN magnets is sufficient to drive the suspension. Further, the OSEM sensor has plenty enough signal to read out the position of the platform, so damping loops will be quite straight forward.

Excellent work design and assembly team!

Details
The data collection templates for the best, diagonalized transfer functions live in
    /ligo/svncommon/SusSVN/sus/trunk/OFIS/H1/OFI/SAGM1/Data/
        2017-10-13_2116_H1SUSOFI_M1_WhiteNoise_L_0p01to50Hz.xml
        2017-10-13_2116_H1SUSOFI_M1_WhiteNoise_T_0p01to50Hz.xml
        2017-10-13_2116_H1SUSOFI_M1_WhiteNoise_Y_0p01to50Hz.xml

Because the new SQZ electronics infrastructure is not yet in place, the drive chain is a temporary setup involving the digital drive chain of OM1 (hence the nonsensical denominator in the labels of the transfer functions), and several in-air cables, including a pin-flip ribbon cable (hence the poor coherence above 5 Hz).

Norna is suspicious of the OFIS's dynamical model put together by Mark Barton back in 2014, so hopefully this data can be used to solidify some degrees of freedom of the model.

I've created a new script that populates the new OFI's infrastructure with a diagonal sensor / actuator basis, which now lives in 
    /ligo/svncommon/SusSVN/sus/trunk/OFIS/Common/MatlabTools/
        make_susofis_projections.m
where the conventions are defined as in E1700352, T1200015, and G1701887. Note I'm also sticking with the SUS convention to have the OSEM2EUL and EUL2OSEM matrices be the *transpose* of each other, and not the inverse. Taking into account that the LF and RT OSEMs (for driving T and Y) are equidistant from the suspended center of mass by l_LR_to_COM = 0.111 [m], but the SD OSEM is offset from the center of mass by l_SD_to_COM = 0.056 [mm], means the drive matrix is 
  | L |    [     +r            +r             -1 ] | LF |
  | T |  = [     -0.5          -0.5            0 ] | RT |
  | V |    [    +0.5/l_LR      -0.5/l_LR       0 ] | SD |

where r = l_LR_to_COM / l_SD_to_COM, and I've abbreviated l_LR_to_COM as l_LR. Actually sticking in the numbers, and reporting as they must be in the CDS system, that's

OSEM2EUL = +1.9821   +1.9821   -1.0000         EUL2OSEM = +1.9821   -0.5000   +9.0090
           -0.5000   -0.5000    0.0000                    +1.9821   -0.5000   -9.0090
           +9.0090   -9.0090    0.0000                    -1.0000    0.0000    0.0000

To support the OutputFaraday Isolator Suspension (OFIS), I created a new Mathematica single pendulum model with two blades but four wires (as opposed to two for HAUX/HTTS). It lives in the SUS SVN at

^/trunk/Common/MathematicaModels/FourWireSimpleBlades

I exported Matlab matrix elements symbexport1blades4wiresfull.m from the Mathematica, copied them to the Matlab single model at

^/trunk/MatlabTools/SingleModel_Production

and adjusted the ssmake1MB.m file to use them when the new parameters pend.dx1 and pend.dx2 are defined. These represent the double-sided wire attachment point separations in the Mathematica x direction (normal to the line between the blade tips).

Because the OFIS is TMTS-style with the optic axis of the payload at right angles to the superstructure compared to most other suspensions, I created a new define_ofisModel_insandouts.m file which mapped MEDM-style L/T/V/R/P/Y to Mathematica y/x/z/pitch/roll/yaw. Note that because of the limitations of the data structure (swaps but no sign changes), I wasn't able to do x->-T, y->L, z->V but had to settle for x->T, y->L, z->V, which is left-handed.

I created a case 20140625OFIS of the Mathematica model using mostly data from D0900623-v8 and D0900136-v5. I chose the blade stiffness to match the measured V mode frequency of 1.509 Hz from LHO alog 11530 and added damping to match the measured L, T and V Q's. I also added a token amount of damping in each angular DOF. The parameters and mode frequencies are summarized at 

https://awiki.ligo-wa.caltech.edu/aLIGO/Suspensions/OpsManual/OFIS/Models/20140625OFIS

The model L and T modes (0.6374 and 0.6306 Hz) are in good agreement with the measured L and T modes (0.6211 and 0.6248 Hz) without any additional tweaks. Unfortunately I didn't do measurements of the angular modes because the damping spec was only about the linear modes. Note the obnoxious R mode at 25.4 Hz.

I exported a Matlab parameter set and copied it to the Matlab directory as ofisopt_damp.m. 

I added a new clause to the switch statement in generate_Single_Model_Production.m to associate the new parameter set with the tag ofisopt_damp. I also added lines to use the new define_ofisModel_insandouts.m when the parameter file name starts with 'ofis', but left them disabled initially.

I adapted plottest.m to do a comparison plot between TFs generated in Matlab (using the standard define_singleModel_insandouts.m), and TF data in FourWireSimpleBlades_20140625OFIS_TF.m exported from Mathematica. After some debugging I got perfect agreement.

In the process of debugging I realized that the damping parameter names being exported from Mathematica (e.g., pend.bx0) didn't match what the Matlab was expecting (e.g., pend.B0xx), so I changed the Matlab to match the Mathematica. I also adjusted the handcrafted (not exported) hauxopt_damp.m and httsopt_damp.m that I'd created previously.

Finally I enabled the code in generate_Single_Model_Production.m to select define_ofisModel_insandouts.m. The rewiring was copied from TMTS and is probably right but I can't think of a good additional test because the OFIS has no sensors or actuators so we can't do measured TFs to compare.

Everything has been committed to the SVN.