Summary:

OM2 was rebalanced, but one of the BOSEMs is bad (one of the PD pin is grounded to the tip tilt body). We will replace it with a spare tomorrow.

We found that the shielding of QPD sled picomotor cablesand WFSA DC cable were grounded to the ISI. The former was fixed by loosening the DB25 connector mating screws and pulling the DB25 back a bit. The latter was fixed by loosening an ultra-tight cable clamp at the stage zero of the ISI.

Please do never tighten the cable clamps so hard that the cable cannot move. You should be able to move the cable through the clamp by pulling gently, though the cables should stay in place by friction when left alone.

Details:

I pulled the OM2, rebalanced, installed again, made sure that BOSEM flags don't interfere, set the BOSEM depth, and THEN found that some of the ground loops were back, and one of them was of course OM2 itself (not the cable).

Pulled OM2 again, and it turns out that the coil with a tiny gap that was OK before was touching, causing the grounding issue. By pushing or pulling the connector using my finger, I was able to make or break the connection, and when I remove my pressure it didn't go back to the original state.

I applied aluminum foil as a shim between the coil bobbin and the connector to make the bottom gap larger, and cocked the connector more to make the side gap larger (I needed to make one of the mating screws somewhat looser than the other), so that there is a clear visible gap all around the metal shell of the connector. It was tested good on the work table, so we installed it back to the table.

When we started setting the depth of the BOSEMs, UL coil was stuck at -8000 or so counts (it was not in the morning, but Dan recalls that that coil was stuck at that value on Friday).

I pulled the coil out while keeping the electric connection intact, and as soon as the coil came out suddenly the open value was -32k counts. As soon as the coil touches the ISI surface, it went back to -8000 counts.

It turns out that one of the pins for the PD for the BOSEM is short circuited to the coil bobbin, and of course the coil bobbin is grounded to the tip-tilt frame. In the morning, for some magical reason, it should have been that the PD pin was not short circuited, or the coil is not grounded to the tip-tilt frame.

Anyway, this is clearly a bad part, and we need to replace it with a spare.

Also UR coil open voltage is somewhat small (-20000 cts), so we'll see if replacing this BOSEM changes it.

Installed SUS Watchdog Chassis D1300642 in rack SUS-C6-U26. Unit is powered up, and the only connections made to the unit are the binary inputs/outputs.

Filiberto Clara

Started with the 750mHz.  It would trip the Actuator with the script so went to hand method.  Going dof at a time, was able to get the RZ RX  & RY dofs on with boosts and they were pretty quiet.  Could get Z on too but it would go unstable quickly when either the X & Y dof was included.  Checked the local to cartesian matrices and they are correct.  Looked at the parameter file in case the loops were created with incorrect matrices...but I could not find that info in the parameter file so not sure if you can determine that.  I did then spot the Blend filter and it said 01_28.  So, I changed the blend to 01_28 and tried the script again but it would still trip out quickly.  Same story on the 250mHz.  However, it is stable with the 100mHz blend...weird.

Attached is a isolated/damped only comparison.  The reference traces are with the lvl1 isolation and 100mHz blends.  The current rraces only have damping engaged.  This isolation does a fair amount of good in various places especially below a few htz but it appears to have resonances and other ill effects at various places above several htz....

- Hugh out to HAM6

- Betsy to Beer garden then to the west bay

- Jeff out to beer garden with film crew

- Jason to ITMX alignment

- Fred and film crew in the LVEA

- Sheila and Greg into the PSL for pictures

While doing the AA/AI rework last week, installed grounding plugs (per L1200193) to all SUS coil drivers at both EY and EX. The plug is attached to the DB9 connector labeled Test Input. This completes all installed electronics in CER, EX, and EY.

Filiberto Clara

5 viewports were installed on MCB 2 today. Ref. W P 4673.

Per bugzilla integration issue 463, looked at AA/AI chassis to verify units have the proper insulating film used to isolate the -15V regulators to the chassis metal wall. 

All AA/AI chassis at EX have been modified or verified to have the appropriate insulating film.

SUS
S1100321 S1105306 S1105295 S1103819 S1202273 S1202611 S1202819 S1202612 S1202820

SEI
S1300132 S1300135 S1300136 S1300140 S1300144 S1300611

ISC (including Whitening chassis)
S1102763 S1102781 S1102777 S1101606 S1101587 S1101631 S1101642

All electronics have been reconnected and powered up. All units were placed back in appropriate rack and slot location.

Filiberto Clara

Per bugzilla integration issue 463, looked at AA/AI chassis to verify units have the proper insulating film used to isolate the -15V regulators to the chassis metal wall. 

All AA/AI chassis at EY have been modified or verified to have the appropriate insulating film.

SUS
S1107601 S1105299 S1105300 S1103818 S1202280 S1103775 S1103772 S1103774 S1103773

SEI
S1103403 S1103401 S1103406 S1103409 S1103510 S1103501

ISC (including Whitening chassis)
S1102755 S1102764 S1102765 S1101600 S1101638 S1101595 S1101579

All electronics have been reconnected and powered up. All units were placed back in appropriate rack and slot location.

Filiberto Clara

Dave reported this morning that TMSx osems readback were moving too much. Looking at a spectra from one of those osems, a 1777Hz line appears to be the main source of oscillation. This looks similar to a problem we had few months ago with one of the sat boxes of the BS (cf alog 7237). We will reboot the sat box and see if that changes it.

The weather station at Mid X has been restarted after replacing an isolator between the weather station and the comtrol serial interface box.  Wind alarms have been set to 30 and 40 MPH.

End X is online, but the anemometer is not working at this time.

Keita is removing a tiptilt so I locked up the ISI.  It was already out of balance and probably should have remained locked anyway.  The cables that were moved from stage1 was enough to unbalance the table.

Once Keita returns the TipTilt, SEI will need to rebalance the table.

No restarts reported.

Today the PSL is down for maintainence so that means

Frontend is down

PMC is unlocked

FSS is disabled and ref cav unlocked

ISS at 8% diffracted power with 0 volts on PDA and PDB

- Keita working in HAM6

- Fil and Richard working on AA and AI chassis

- Peter, Patrick, and Olli working on PSL maintainence

- Jodi working on 3rd IFO in LVEA

- Robert going out to the vault

- Gerardo working on CPB

I have created new MEDM screens for the new software watchdog (SWWD) system. These are macro substituted screens, launched from H1CDS_SUS_SWWD_LAUNCHER.adl which is accessed from the SITEMAP via the SWWD option under the WD pulldown. Currently there are two new MEDM screens for EY and HAM6.

model restarts logged for Fri 13/Jun/2014
2014_06_13 11:08 h1broadcast0
2014_06_13 11:08 h1dc0
2014_06_13 11:08 h1fw0
2014_06_13 11:08 h1fw1
2014_06_13 11:08 h1nds0
2014_06_13 11:08 h1nds1
2014_06_13 11:11 h1iopiscey
2014_06_13 11:13 h1iscey
2014_06_13 11:13 h1odcy
2014_06_13 11:13 h1pemey

no unexpected restarts. DAQ restart to support SWWD work, ISCEY to clear DAC error.

  The attached screen shot ZtorZCoupling.ing shows the meaured transfer function from stage 1 Z drive to the T240 rZ signal (blue line) and the measured magnetic coupling which was done in the staging building, there are only

two points in this measurement as of now.  If you divide the measured magnetic coupling by 10 it exactly matches the transfer function, so I'm not sure what is going on there, but the case for the mystery coupling being magnetic is pretty strong.

  The attached T240 rZ Signal shows the signal from the T240 rZ (trciky huh?) in low blend mode, with the subtraction in three different states

   Blue = OFF

   Orange = ON

   Red = ON with the wrong sign (gain = -1)

     You could convince your self that above 60mHz the subtraction is doing something good (it is mostly aimed at below 100mHz), nothing below 60mHz and something very bad at 60mHz, that you get almost

identical badness at 60mHz for either sign must (might?) mean something

  The figure YAW OPLEV shows the same thing using the optical lever signal

  The fact that we don't see a factor of 50 improvement isn't very surprising, but the fact that the subtraction makes things worse in the middle of the measurement band is. Right now I'm speculation on drives from other degrees of freedom coupling to the T240s although I

the mechanism isn't very clear to me

  We did take a look at rZ to Z coupling, which might create an unindented loop when the subtraction gets turned on, but didn't see anything.

  I've been using verious templates in /ligo/svncommon/SeiSVN/seismic/BSC-ISI/H1/ETMX/Data  and ETMY/Data

  The  ETMX_Performance ....xml are passive  Twist_Measurement ....xml  are driven

  I've added a few more plots to the T240rZ.... plot

   MoreT240Performance

   Blue = OFF

   Orange = ON

   Red = ON with the wrong sign (gain = -1)

   Blue

   Black Start blend (no T240 in loop)

  Green  Lower Blend Frequency, ~40mhz pervious ow blend was at ~100mHz  (subtraction on)

Purple Lower Blend Frequency (no subtraction)

   there are really to many lines here to make an sense of, but as far as the T240 thinks, subtracting hurts at 60Mhz, more interesting is the MoreOpLev plot which shows that above 200mHz it doesn't  seem to matter what I'm doing with stage 1 (More OpLev)

if anyone really wants this is all in ETMY_Performance_testbb.xml

Thanks to the efforts of SUS I was able to get in and look at the ring heaters of ITMy today. There are no apparent problems with breakage of either the glass formers or the macor retaining pieces. However, the center macor piece (D1002545) looks to have wandered off center quite significantly. I didn't have any pictures from that angle while the quad structure was still in chamber. So, unfortunately, I am unable to determine when it wandered off, but it definitely warrants looking at ITMx closely before it leaves BSC 3 if possible. 

It should be noted that this is the older style of ring heater, but the macor element standoff is the same throughout all but the most recent version.

J. Kissel

Dither paths have been added to the HSTS OVERVIEW screens, completing all development for ECR E1400105 / II 722. I attach a screen shot of the new screen. I also fixed a few bugs found in the QUAD implementation as noted yesterday, and updated the BSFM screen, in which Stuart found some bugs (see LLO aLOG 13048). These screens are also attached. As soon as Stuart gets the model changes for his HSTSs, HLTSs, and QUADs installed, and updates to the new screens, we can close out the integration issue and begin using these paths as need be. 

Note, that though I committed the dither path changes, I've retained the still-under-development local modifications for the prototype ESD linearization (initially installed a month ago) so the common parts for the QUAD, 
${userapps}/release/sus/common/medm/quad/SUS_CUST_QUAD_OVERVIEW.adl
${userapps}/release/sus/common/models/QUAD_MASTER.mdl
remain locally modified.