Last week I took some in chamber, in vacuum acceptance measurements for TMSx and TMSy. ISI tables were both isolated during the measurement.

Attached are the 6 Dofs transfer functions measurements as well as the osems spectra for both suspended tables :

1. TMSX TF compared with the model
2. TMSX spectra for each osem, as well as in the euler basis
3. TMSY TF compared with the model
4. TMSY spectra for each osem, as well as in the euler basis
5. TF comparison of both H1 TMSs and L1 TMSs

To note :

The difference seen in the TF of H1 TMSx is explained in previous alogs
TMSx spectra shows excess 60Hz noise in F1 F2 F3 and LF osems (see 2nd attachment)
Damping for the yaw degree of freedom, for both TMSs is increasing the motion at the resonnance (see last page of 2nd and fourth attachment). I will turn the yaw damping off for both TMSs for now.

Took a first look at the SRM surrogate (SRM-s) today and lo-and-behold, no adjustment was necessary.    The cookie cutters did their job and placed the suspension within spec for X, Y, and Z axis positions.  The position errors are below:

• X axis (lateral): -1.5 mm (south)
  • Tolerance: ±4.6 mm
• Y axis (longitudinal): +1.3 mm (west)
  • Tolerance: ±3.0 mm
• Z axis (vertical): +0.9 mm (high)
  • Tolerance: ±3.0 mm

I have begun and mostly completed the setup for the rough pitch/yaw alignment of the SRM-s.  This will be completed tomorrow morning and the rough pitch/yaw alignment will follow.

Fabrice and Dave:

We successfully made a new h1isiitmy model using the latest isi2stagemaster model changes. We restarted h1isiitmy with the new code

Chris, Sheila, Dave:

I found that I had mistakenly restarted an incorrect h1asc model on Tuesday. After the first DAQ restart that day I noticed that the DAQ picked up a newer INI fle for h1asc and I assumed (which we should never do) that the last "make install" was correct. It appears that later changes were not installed. 

I did a clean "make" and "make install" on h1asc and restarted the model.

Dave:

Finally I did a DAQ restart to support the above changes (remembering to wait into the next 10min period to flush out the second trends)

Here is the restart sequence in detail:

2014_05_15 13:16 h1isiitmy
2014_05_15 13:19 h1asc
2014_05_15 13:22 h1broadcast0
2014_05_15 13:22 h1dc0
2014_05_15 13:22 h1fw0
2014_05_15 13:22 h1fw1
2014_05_15 13:22 h1nds0

8:15-8:30

Fred, Richard, Cyrus, Filiberto, Aaron, Bubba, Gerardo, Jeff B, Bubba, Travis, Hugh, Mitchell, Justin, Mike, Thomas, Jeff K, Fabrice, Alexa, Steban, Robert, Jamie, etc.


•	SRM alignment on HAM5 - (Jeff B/Jason)
•	TCS tables work continues. – (David, Thomas)
•	Getting things ready to transport the OFI - (Gerardo)
• 	Craning activity in LVEA / Moving clearoom from west bay -(Apollo)
• 	ICS rack inventory in LVEA – (Richard/Filiberto)
•	Commissioning work continues (Commissioners)
•	Testing and assembly operations continue in Staging building –(Jim/Hugh/Scott)
•	Guardian work in progress -(Jamie)


        LVEA is Laser SAFE

Richard warned me that the Fiber polarization had probably drifted at EY due to some work done around the table. Indeed it had drifted to up to 33% for the wrong polarization. However, Stefan had increased the threshold to 36. I returned the threshold down to 30 and adjusted the controller. I also had to adjust the EX polarization when I turned the controller on, which forced both polarizations to drift. All is good now.

Craning activity in the LVEA at the moment. A cleanroom is being moved - Apollo

model restarts logged for Wed 14/May/2014
2014_05_14 12:37 h1fw1

unexpected restart of h1fw1

Kiwamu, Stefan,

Both ALS_DIFF and ALS_COMM were straight forward today, and we got them locked literally in minutes. I.e. the ESD is still working fine.

We misaligned the arms, and verified that 3f locking works just fine without the arms.

We locked the arms and parked them 1kHz off resonance. I this configuration the the RF27_I signal worked fine, but the REFL27_Q signal had significant contamination from the COMM noise at 70Hzish (periscope peak). Thus we designed a broad notch filter in the mich loop, which kept the BS from saturating.

However it seems that MICH is still too strongly contaminated by the low frequency COMM noise. As a result the MICH loop seems to drift out of its linear range.

Ideas:
 - divide REFL27_Q by POP_18 to expand the linear range
 - rephrase REFL27 to reduce the coupling

Either way, an earthquake told us to get some sleep.

David H, Greg G, Thomas V

- Corner Hartmann table now has the Y-arm in-air optics mounted and positioned, ready for alignment using the visible laser. Components for the HWS were tracked down and staged.
- TCSX CO2 laser continued to run all day. Once going to laser hazard we realigned the CO2 beam that is transmitted through the output beam splitter. This transmitted beam passes through another 50/50 beam splitter, with the (second) transmitted beam aligned to the output power meter, while the reflected beam was expanded and aligned to the FLIR camera screen position. This required the repositioning of some cables and mounts located near the CO2 laser and RF driver.  

TSCX laser will continue to run overnight. Rotation stage set to 44 degrees (with interlock cable removed to prevent changes to this angle). Table doors are locked. 
TSCY chiller and power supplies continue to run, TCSY laser is turned off.

Richard showed me that there is a liner coupling from any of the electrodes to the OPLEV even when there's no bias anywhere, and the bias-less coupling is on the same order as the coupling with bias.

I started flipping the bias of the common ("DC") electrode while keeping all four quadrants at zero count output, and indeed there's a linear coupling, and the effect is not subtle.

In the attached, I changed the DC bias from 125000 to 0 to -125000, then to 0 and finally back to +125000. The ETM points up by 0.3urad in the first step, then further up 0.5urad in the second step (instead of going back to the original position). It's 0.8 urad peak to peak!

OTOH, when I set the four quadrants such that top two outputs -50900 counts and the bottom +50900 to tilt the optic legitimately while the DC bias is kept at 125000 counts, I can only move it by -0.5 urad peak to peak (second attachment).

This could still be electronics offset, so I looked at the ESD readback. The readback is not calibrated, but four quadrants always read from -75 to -200 counts when I'm outputing zero, the 300volt-ish thing reads 30000-ish counts, so the voltage offset for the quadrants should be 2V-ish at most. That's not large enough, I think.

J. Kissel, for F. Clara, and R. McCarthy

After investigating further, Richard and Filiberto found that source of failure in the chassis was the mysterious loss of the +18 V power supply to the ESD driver chassis between rack power strip and the the back of the chassis. This was confirmed after disconnecting, to find the positive leg without continuity. However, after "pulling the cable apart" to find the source of the discontinuity, he was not able to reproduce it. After reassembling the cable, and restoring the connection, the driver came alive again. Further vigorous attempts to recreate the disconnect were unsuccessful. It appears the gremlins inside the driver chassis are creeping there way out to the power supply.

This 18V power cable came with the ESD driver from Strathclyde, so Richard plans to replace it with one commercially made in house.

As soon as I get the arm from fellow commissioners trying to finish gathering data for her thesis, I'll try to grab the data I'd originally set out to get this morning.

While working on EX suspension, I realized the yaw motion was big on the oplev, so I tried switching the Rz blends on the ISI to see what's a good config. Moving the Rz blends of both stages from Tcrappy to Start seem to have helped (~0.6urad peak to peak -> ~0.2urad). Green curve in attached plot is the oplev yaw signal (urad)

Day's Activities

• 6:30am ETMy measurement ran (was done early morning)
• MY low pressure sensor still valved off causing alarm
• SRM Install work begins (Jeff, Andres, Betsy)
• 9:10am Pulling cable at end stations (Aaron)
• 9:15am David/Greg working on Hartman table
• Kyle will be doing Vacuum system work today
• 9:20-11:44am SRM Alignment set-up (Jason)
• 10:05am Travis/Mitch ACB work
• ~10am Dust Monitor #5 went to a few thousand counts (but didn't receive an alarm for it)
• 11:20am Richard/Fil heading to EY for ESD work
• KEPR film crew on-site.  (will broadcast at 5 & 6pm)
• afternoon--EX ESD work (Richard/Kissel)---swapping out chasis
• High dust counts in the Beer Garden (Jeff investigated)
• ISS PD Array in the H2 Laser Enclosure Room (they will be going to Laser Hazard in their room)
• Since EX & EY are closed up, I increased the Dust Monitor Alarm levels to 500counts (MIN) & 1000counts (MAJ)
• Transitioning to Laser HAZARD after Safety Meeting

J. Kissel, for K. Izumi, S. Ballmer, and S. Dwyer

One of the tricks to get ALS DIFF working without saturation was to tweak the distribution filter design. I attach a comparison between the filters installed on 2014-05-08 vs. those tweaked last night (2014-05-14). Only two small changes: 
(1) To the UIM-TST LP, whose composition included 
    (a) two poles at 6 [Hz], three poles at 150 [Hz] 
    (b) elliptic filter of (freq,order,ripple,stopDB,zQ) = (9, 3, 1, 20, 1.4)
    (c) elliptic filter of (freq,order,ripple,stopDB,zQ) = (19, 3, 1, 20, 1.4),
now has the second elliptic filter's corner frequency much lower, at 6 [Hz], i.e. a new (c) of 
    (c) elliptic filter of (freq,order,ripple,stopDB,zQ) = (6, 3, 1, 20, 1.4),

(2) To the TST-UIM HP, whose composition included
    (a) (1 - UIM-TST LP) 
    (b) an elliptic high-pass of (freq,order,ripple,stopDB,zQ) = (.7, 2, 1, 10, 3)
now has an additional high-pass filter,
    (c) two zeros at 0 [Hz], two poles at 0.2 [Hz], normalized to unity at high frequency, i.e. zpk([0;0],[0.2;0.2],1,"n")gain(25)
Note that this extra low-pass has been installed, ignoring its affect on the complementarity with the UIM-TST LP. This needs to be fixed if we desire complementarity.

These tweaks served to (1) to move the elliptic filter's gain peaking bump out of the way of the 10 [Hz] features in the input noise, and (2) roll off the low-frequency end of the test mass drive faster.

-------------
Details 
The New H1 SUS ETMX Filter Configuration:

H1:SUS-ETMX_M0_LOCK_L (same as before)
FM1 "invL2L1" (part one of plant inversion filter)
FM2 "invL2L2" (part two of plant inversion filter)
FM3 "top/tst" (gain only filter to compensate for the gain ratio)

FM5 "blendLP"

H1:SUS-ETMX_L1_LOCK_L 
FM6 "invL2LNEW" (part one of plant inversion filter)
FM7 "patch" (part two of plant inversion filter)
FM8 "LISOfit" (part three of plant inversion filter)
FM9 "uim/tst" (gain only filter to compensate for the gain ratio)

FM3 "blendHP" (UIM-TOP HP complement)
FM4 "blendLP-2" (UIM-TST LP complement, with lower frequency elliptic filter)

H1:SUS-ETMX_L3_LOCK_L
FM6 "MatchedinvL2L" (part one of plant inversion filter)
FM7 "patch" (part two of plant inversion filter)

FM4 "blendHP-M0" (TST-TOP HP complement)
FM5 "blendHP-L1_2" (TST-UIM HP complement)
FM9 "hp.2" (extra high-pass for TST-UIM HP complement)


In order to create these modifications to the UIM-TST LP, Kiwamu grabbed my design script from 
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/FilterDesign/HierarchicalControl/DARMmodel_ALS_20140428.m
copied it to his home directory, 
/ligo/home/kiwamu.izumi/
to play around,
/ligo/home/kiwamu.izumi/Desktop/farm/matlab/
modified the filters mentioned above, and then used a fancy new script,
/ligo/home/kiwamu.izumi/Desktop/farm/matlab/fofon.m
which takes in a continuous zpk filter, and produces a foton design string to be copied and pasted into Foton. If the filter is a high-pass, the only other step is to use the "Gain" field to set the gain to be unity at high-frequency.

The modification to the TST-UIM HP was done later in the evening after I'd left, but by the simplicity of its design, I think it was just added directly without testing any stability or complementarity in Matlab prior to install. 

[[elliptic filters are generated using ${SeiSVN}/seismic/Common/MatlabTools/myellip_z2.m]]
[[hp elliptic filter is generated by ${SeiSVN}/seismic/Common/MatlabTools/myhpellip_z.m]]

Andres R., Margot P., & Jeff B.

   We installed H1-SRM into HAM5 today. The installation went smoothly. Will start on alignment work in the morning.  

I think that the ISI trip happened before the suspension trip, this was while we were locking diff.  I also thought that the T240s were green before I untripped the watchdog, but maybe they weren't because the ISI tripped again as it was isolating. 

This afternoon, after Jeff balanced the coils, I took measurements on the main chain of ETMY for filter design.
Results attached are showing Length/Pitch/Yaw drive to Pitch/Yaw Response for the top mass, UIM and PUM. Y axis is in urad/cts

Templates live in the usual sus path H1/ETMY/SAGL1/Data/2014-04-16_H1SUSETMY_P2PY_WhiteNoise.xml