Today, Jeff, Andres and I finished disassembling the lower structure and 4 lowest masses from the ETMy QUAD upper structure.  This involved pulling all of the reaction lacing cables up the chain.  As well, we had to cut the fibers off of the previously monolithic HIFOy masses in the suspension.  When Travis went to cut the first fiber out, the lower mass was apparently under some small load and the fiber broke it and it's adjascent fiber off.  We think there was still some load on the fibers even though all of the masses had been locked in place.  We raised the test mass before proceeding to cut the next 2 fibers out.  Jeff, Andres and I then split the chains and left the main chain resting on the Genie arms and the reaction chain on the 5-axis/scissor lift equipment.

After lunch, Angus and I pulled the PUM out of the suspension and canned it (Gerardo - we're missing a top o-ring plate in the empty can - so the canned pUM is missing it.  We need to steal one from the next can out there).  I then cleaned the lower sus via vacuum while Angus continued preps with Travis in the weld area.  We then stuffed the new PUM and got practice fibers loaded into the practice suspension for welding tomorrow.

I'm now out the rest of the week, but here is the sequence of tasks that need to happen next:

TUE AM - Gerardo / Travis pull the Test Mass, park the Main in the weld room, park the Genie under the reaction chain for added safety

TUE mid-AM - Travis / Angus / Alastair start practice welding (make sure to get panels in place)

TUE mid-AM - TCS peeps swap the ring heater (yes, likely in laser hazard, sorry)

TUE aft - finish practice weld

TUE aft - Gerardo / one of the weld crew stuff the new test mass

WED - set LS main mass DOFs and start real welds

Y'all already have mad skills, so smooth running and good luck to you!

Sensor's rotatable 2.75" CFF had a significant "ding" on knife edge -> don't have spare -> messaged with stone -> likely to be a leaker -> marked for leak check

- Cable routing in beer garden for OptLevs - Fil, Aaron
- Replacing sensor card on Aux Cart at EX - Gerardo, Kyle
- Tour for documentary - Mike L
- Viewport survey at EX - Hugh
- Commissioning work - Alexa, Kiwamu, Sheila
- Staging and preparing for fiber welding - Betsy, Travis, Agnes
- Working on quad at EY - Jeff Bartlett

The roofing membrane work is complete. All that remains is to complete the lightning protection system and install a few runs of downspout. Once we get some warmer weather I expect this work will be completed in a few days.

There were several conversations this morning WRT outstanding general INS tasks that remain to be worked. The tasks Bubba and I had in mind were grouting at HAM5/6, removing aLIGO HEPI components from HAM7/8/9/10, and removing aLIGO feedthroughs from HAM7/8/9/10. The grouting work would be very dirty and very close to the SRs so Michael decided against that. Of the two remaining activities, the feedthroughs seemed the easiest to start. In conjunction with that work, Apollo will replace all Al blanks on H2 chambers with conflat blanks. Scott and Tyler spent the afternoon gathering materials. 

All beam tube insulation has been removed. Enclosure has been nicely cleaned up.

(Kyle, Gerardo)
Replaced the dual pirani sensor card for aux pump cart #1, and started pumping BSC09 annulus.

Roughly 30 elk crossed route 10 a few hundred meters from the entrance to LHO this morning.  
Watch out while driving... cell photos attached.

The ref cav transmitted light kept decreasing over this weekend. I had to set the threshold further down to 0.3 yesterday while the nominal is 0.9. This needs an investigation at some point.

Sheila, Kiwamu, 

Today we realized that the centering on MC3 that we did on friday night resulted in a bad mode cleaner alingment.  We used DOF 4 to minimize the angle to length coupling of MC3, but this resulted in operating close to the edge of the osem range.  While Kiwamu and I were trying to align IM1+IM2 to get through the faradat this afternoon, the mode cleaner got into a state where MC3 was constantly tripping.  We plan to go back to the mode cleaner alignment as of friday afternoon, live with the clipping in the IM1 trans path and move on to aligning the IMs and PRM tomorow.  

The good news is: we know how to look through the veiwport and align the beams through the Faraday, and IM1+IM2 give us plenty of actuation range to do this.  

Our mistakes were:

The beams on the wall are IM4 trans, not IM2 trans.  The rumor I started that they were IM2 trans caused us to think we didn't have enough range on IM1 on friday, which is why we started the centering on MC3 in the first place. 

We centered on MC3 by introducing an offset to DOF4, which changes more than just the centering on MC3.  

We might want to measure the spot positions on all 3 MC mirrors and compare to Jax's measurement in alog 6676, to see if this makes sense. 

Just to note: on saturday Stefan and I realigned the IM1 trans path on IOT2L, when we revert the MC to friday afternoon we will have to realign that.  This afternoon I restored the PZT to where it was friday afternoon, and restored MC1 to where it was friday afternoon using the witness sensors.  After that we realigned the refl path on IOT2L roughly.  The next steps are to restore MC2+3 using the witness sensors, and fine tune the alignment on the refl WFS once the MC is locked.  

On Friday:

- Apollo finished staging the cleanrooms/garb/work tables/sticky mats, etc.

- Apollo did thorough cleaning of the cleanrooms/receivings/VEA.

- Travis and I staged the EQ needed to remove the lower structure (Ergo arm/pump/monitor box, scissor lift with 5-axis table, stool, tools, LSAT)

- We transported the new PUM, the new Test Mass, and an empty cake tin to Ex.

- Travis started staging the welding EQ - ran into a snag with missing chiller hose fittings (!)

- I started prepping the lower structure for removal (dropped the x-braces, vib absorbers, wedges, and most of the bolts holding the sleeve up).  There was a reason the procedures always called for SUS work to take place prior to TMS install.  Removing the LS with the TMS in place is a challenge.

It will take Angus, Travis, me, and Jeff or Andres all of Monday to get to the point where we are swapping in the new optics on Tuesday morning.  Slow as she goes.

Sheila, Kiwamu, Stefan, Alexa, Arnaud, keita.

Today we started out by projecting the spot on IM2 trans on the wall, and saw that it was so high that we were unable to steer it to the reference (from Oct 4th 2013) with our range (after the coil driver change).  After some investigation, we set things back to what we thik the alignment was in late september, using both HEPI and using the BOSEM readbacks for the suspension alingments.  After that we saw that the spot was still too high on the wall.  

We then started measuring the beam centering using the A2L coupling of MC3.  We used the A2L coupling to adjust the offset in the uncontrolled DOF (DOF4 pitch).  We have reduced the coupling by a factor of 10.  

New safe snapshots have been saved for MC1 MC2 MC3 with updated "correct state" for the lock bank (cf screenshot 2), updated bit masks (Bitmasks 8 and 9 were turned off) (cf screenshot 1), and updated alignment offsets during the lock. The ODC status has now its bit 1 to 7 turning green when necessary.

Bitmasks 8 and 9 were turned off using caput from the command line :

caput H1:SUS-MC3_ODC_CHANNEL_BITMASK 254

For x1work, installed nfs server and exported /usr1 for mounting as /ligo.

For x1ws0 (iMac), mounted x1work:/usr1 as /ligo to allow native OS X software to run on workstation.

Jim and Dave. We continued the investigation of the problem of incorrect slow channel data in the DAQ from Front Ends following the upgrade to RCG2.8.

The problem is more widespread that just h1hiitmy. We have also seen it in h1susitmy. It appears that only the non-filter-module floating-point slow channels are affected. The problem is related the channel list defined by the INI file. There is a point in the slow floating-point channel list at which channels above do not have the problem, channels below all have problems. The problem is actually a channel shift. For h1susitmy the channels are shifted by 3, for h1hpiitmy the channels are shifted by 2. The point at which the shift starts varies from model to model. It is after a few hundred floating point channels for h1susitmy, and immediately for h1hpiitmy.

Finding the break point is not trivial. Many of the slow channels are zero, or have rapidly changing signals. We are getting the data from the NDS and comparing it with a direct EPICS channel access read of the data.

We will work on scripts over the weekend to get more data on the problem. Hopefully when Rolf is here next week we can implement a fix. The silver lining is that little data has actually been lost, the data is being acquired by the wrong channel name.

Below is a summary of the available controls on SEI platforms, for PRMI. Platforms should run under their preferred configuration at all time.

HAM1:

• HEPI: Floating

HAM2:

• ISI: Lv3 Isolation, fed by 01_28 generic blend.
• HEPI: Position loops ON

HAM3:

• ISI: Lv3 Isolation, fed by 01_28 generic blend.
• HEPI: Position loops ON

• ISI: Lv3 Isolation, fed by:
  • Stage 1: T250mHz blend, with T100mHz_N0.44 on X and Y
  • Stage 2: 250mHz
• HEPI: Position loops ON

A set of matlab transfer functions has been ran on the TMSX this afternoon after BSC9 was closed out, and while the ISI was damped. The pitch degree of freedom shows some excess noise between 0.7Hz and 3Hz, which is something I was not expecting to see since the measurement after the last work accomplished on TMSX was clean.

It might be related to some excess motion at the time of the measurement during the afternoon, which I will check by running undamped and damped TFs overnight in a quiter environment. We will see how repeatable the measurement is tomorrow morning.

It might also be the position of the cables that could have changed by themselves because of their weight. Or maybe some work that I'm not aware of that was done after the last measurement taken. In those cases we would probably need to physically check what is going on.

Results attached are described below :

(1) Comparison between the model and last TMSX TF

(2) Comparison between TMSX after the work done on Nov 20th (Orange trace), after the last time work has been done on Nov 22nd (black trace), and today (pink trace).

See the 5th page of (1) and (2) for the pitch dof

[Jeff B, Andres R, Rich A, Jeff L, Koji A]

We successfully resolved the grouding issue of the OMC preamps, thanks to the help provided from Peter K, Rick S, and Betsy B
for the necessary isulating materials. Here is the note for ourselves and someone who may work on this insulation for L1 and 3IFO.

The grounding of the ISC cables were caused by the mounting of the preamps (attached figrue, left). The PEEK washers
were used to isolate the bracket from the structure. In order to fit the wahsers, we had to trim them (only for the outer one) with crimpers.
In order to isolate the 1/4-20 screws from the hole walls, we used Kapton tubes. Since the diameter of the tube was too big
for the hole, we had to open the tube and trim it to reduce the number of turns. In addition, the metal washers should have
been removed as they sneakily caused the grounding with the preamp.