Today, Travis and I discovered that we had incorrect blade tip heights on both the main and reaction UIM masses of the ITMx.  The blades were set ~5mm too high causing Jason to sight a high test mass.  Joe O'dell from RAL happens to be visiting htis week (on the QUAD design team) so we put him to work helping us lower all 4 blades.  Once that was finished, Jason re-observed that we were still ~3-5mm too high.  In conversation with Hugh, it dawns on him that one of the height locking stages of HEPI does not have top stops to constrain upward motion.  And since we removed most of the QUAD, we think possibly stuff floated upward upstairs (HEPI).  We did replace most of the QUAD, but the side constraining HEPI lockers can get jammed into position not alowwing for downward float.  Additionally, the use of the install arm to reinstall the QUAD may have created more upward force on the HEPI than intended.

Jim is poised to check for gaps on the bottom HEPI lockers tomorrow morning first thing, after he gets a sub for his operator chair duty. 

Made modifications to whitening chassis in racks: ISC-R1, ISC-R2, and ISC-R4. Connected all units back in R1 and R4. In the process of cleaning up cabling and reinstalling electronics in ISC-R2. Work will continue tomorrow.

Day's Activities

• Apollo transferring container from mid stations to Hi Bay
• Baffle work in West Bay (Gerardo & Apollo)
• 9:15 ISC AAI Chasis work (verifying proper insulation) these are racks near PSL (Filiberto/Aaron)
• 9:20 Beginning ITMx alignment work (Jason & SUS)
• 9:40 Oplev HAM4 in-chamber work (Thomas)
• 9:40 Hardware watchdog investigation (jim)
• 9:45 Taking photos of ITM (greg)
• PSL work ongoing
• Travis heading to ITMx
• Camera software work (Cyrus)
• Jeff/Andres moving SUS stuff
• Richard working out at EX
• Maintenance:  Unifirst on site, Praxair delivery
• Guillermo running injections on BSC10 BSC10 ISI
• Dave/Jim worked on software watchdog for SUS's

--Dust Monitor #6 at HAM6 continues to give faulty readings

Peter, Patrick, Kiwamu and Dave.

The DC readout of the PSL-FSS RFPD cable was connected to the 7th channel of the PSL-FSS ADC. The h1lsc model was changed to remove this channel and the h1pslfss model was changed to add this channel (channel name was not changed in the transition).

In detail,

LSC model PSL top-named part, model file is lsc/common/models/lscpsl.mdl. This had three parts:

filter-module-with-control (all inputs grounded) for RFPD which was removed (moved to h1pslfss)

filter-module-with-control (all inputs grounded) POWER_SCALE which has extensive LSC links and (via IPC) ASC links too. We left this unchanged.

epics-input part (input grounded) POWER_REQUEST which was not used by the model nor any MEDM other than tam.adl. Kiwamu gave permission to remove this.

PSL FSS model, file psl/common/models/pslfss.mdl modified to connect the 7th ADC input to a new standard IIR filter called RFPF_DC

Bottom line: tthe filter module name is still H1:PSL-FSS_RFPD_DC, but is now hosted from h1pslfss and not h1lsc and is a standard IIR filter sans controls.

(Corey, Rick)

Rick and the PSL crew have a procedure for Operators to run through for assessing the performance of the PSL via the DBB (Diagnostic BreaBoard).  This is something which should be done on a weekly basis.  (takes roughly about an hour).  The procedure shows how one runs the measurements and it also generates plots one should post in the alog.  Today, we went through the procedure and made a few notes.  We were not able to run all the measurements since the FSS was down at the time. 

The four DBB measurements we ran were:

1. RPN (Relative Power Noise)
2. PNT (Pointing Noise)
3. MSC (Mode Scan....Beam Quality Measurement)

We did not get to run the FRQ (Frequency Noise Measurement), since the FSS was being worked on.

Attached are the measurements we ran (they are located at: /ligo/lho/data/psl/psl_noisereports/2014-06-17)

Will post  an Operator Procedure for this soon!

I and Dan replaced the bad UL BOSEM unit (SN of bobbin part of that assy is SN250, D0601106-C) with a good one (SN282) pulled out of spare "half-assembled" tip-tilt assy (base plate SN 034).

We also replaced UR one (SN258) with a spare (SN134) that was pulled out of the same half-assembled TT assy simply because we were not sure if the open voltage of SN258 (about 20000 counts) was too small. Later it turns out that 20k counts open voltage is not abnormal.

The newly installed units were of course assembled in the past but without fit check, and it turns out that the gap around the connector was non-existent and I had to loosen some screws and shift things around to make a good gap. I also used aluminum foil shim trick.

After this, we centered BOSEMs for all Tip-tilts to half the open voltage.

WFS DC, AS_C QPD, OMCR QPDs, OMC QPDs and OMC DCPDs all responded to flash light.

Beam diverters moved back and forth.

Picomotors moved. On cable #234, the first, the second and the third channels correspond to WFSA, WFSB and AS_C picomotors. On cable #235, the first channel is the downstream 2" mirror for the QPD sled, the second the upstream 1" steering.

Checked ground loops from outside the chamber, and all cables including SUS were good except beam diverters (we know that they ground inside the chamber) and OMC QPDs (shield grounted to the DCPD signal ground) and OMC PZTs (same as OMC QPDs).

This morning, Arnaud mentioned that 2 of the 14 OSEM signals on SR3 were completely open light.  To which, Travis and I leaned in and said "excuse me, what??"  Apon trending and attempting to actuat, Arnaud found no life on the suspect 2 OSEMs/magnets on the M2 (Intermediate) stage of the SR3.  This screams broken magnets to us, however we cannot inspect becuase the doors are still on the chamber.  Arnaud will append trends and details of when it happened below, but we will add to the LONG vent list to fix these in-situ.  Note, the HLTS intermediate EQ stop design is very BAD (see attached pix).  The bottom EQ stops of the intermediate mass are pretty much inaccessible - they can only be accessed via sticking your hand through the optic below.  Tools do not help.  Likely the lower EQ stops were not set close enough to the mass.  (Ignore the red circle in the first picture - it highlights a whole different problem.  The inaccessible EQ stops are in the green circle on the 2nd picture.)

ITMx Install:

Yesterday, Travis and I connected and aligned all 12 top stage BOSEMs and made a round of course alignment on both main and reaction chains of this QUAD sus.  We then attached the corner cube mount and took the optic position-to-cube measurements for IAS.  We swung the ACB back into position such that IAS can have line-of-sight to the ITMx from the x-spool, so we anticipate X,Y,Z numbers from IAS later this morning.

• Jason checking position on ITMx
• Viewport inspections:  Margot documented the TCS ones
• HAM6 work continues (i.e. Tip Tilt work)
• HAM4/5--script work yesterday by Hugh, nothing pressing
• PSL:  flow sensor issue (hope to swap), working in H2 enclosure in afternoon,
• ISC work in racks hope to be completed today
• Glitchy TMS at end station investigation
• software watchdog ham4/5 work?
• Apollo:  staging building work on containers
• Possible HAM4 septum being removed for Hartman alignment
• Staging:  torquing plates together, & cleaning containers
• cpb:  help loading into alignment jig---> will go on this morning with Apollo help
• BSI ISI #3 Testing continues (hopefully in can at end of the week)
• Maintenance:  Rebolt doing exterior work at kitchen
• Introduced some new SURF students

model restarts logged for Mon 16/Jun/2014
2014_06_16 14:47 h1nds1
2014_06_16 14:57 h1nds1
2014_06_16 16:25 h1fw1

All restarts were unexpected. These systems relate to the default NDS, which may not be a coincidence.

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....

Kyle valved out the Y1 Module for a few hours today. Tomorrow  we will valve out the Y2 module.

Attached is the rate of rise for the two end vacuum gauges.

If I have done the math correctly this translates to a very low outgassing rate with no significant leaks :  1.3 e-6 tl/sec for the 2km module. If it is all H2 this yields ~2e-14 tl/s/cm2