(Corey, Filiberto)

Keita walked us through a ground loop he noticed on the TMS (the cable which goes to 4 [of 6] BOSEMs on the TMS).  I went in chamber and Filiberto went to the air-side of the flange for this cable. 

• Filiberto first confirmed that there was indeed a short.
• I then disconnected the Seismically Responsible (SR) Cable from the BOSEM cable to try and narrow down to the culprit and luckily we were able to see that it was the SR Cable (this cable goes from a Cable Bracket on the Optics table and then up around the ISI Stages upstairs and then off to the Chamber Flange.
• Didn't find anything on the Optics Table side.
• Started to unscrew the cable from flange, and before removing Filiberto noted that the short was gone. 
• Completely removed the cable to make sure the slot-head screws were screwed in tight and were not causing the short (they were fine)
• Reinstalled the cable by pushing it in completely (no short observed).  Then started screwing in the cable (no short observed, at first).  Then a short was observed when the the set screws were screwed more. 
• So, I simply engaged these screws enough to keep the connector on the flange and called it good.
• Ground Loop eliminated.

K. Izumi, J. Kissel, M. Heintze

Picking up from where we left of yesterday, we were able to confirm full DRMI flashing with very little effort. However, upon moving towards mechanically relieving IM4 alignment biases, opening the WEST side of HAM2 bumped the IMC bypass path once again. Rather than repeat all-day yesterday, we've elected to move on -- begin the close-out process for HAMs 4 and 5, and BSC3, resume IAS alignment of ITMY reaction chain and use the *misaligned* bypass beam as a reference (using REFL WFS A and B DC signals in HAM1). We're half-way through getting IM4 de-biased, feeling lost in the weeds, and finding out again how terrible it is to balance these SUS. But we'll get it back, or die trying.

Blow-by-blow
- Went into HAM5, took a look at SRM found no beam
- Found SR3 offsets and damping off. Turned on SR3 offset and found spot and fringing immediately, with some SRM flashes
- Move to aligning PRM to get PRMI flashes, tweak alignment by removing Pitch offset (from P=-505 to P = 0), and going from Y=-408 to Y=-395
- Also saw good spots on REFL WFS A nd B DC
- Also saw good beam on ISCT1.
HAPPY HAPPY!

- Vote to declare DRMI flash victory and move on to IM4 de-biasing
- Went to HAM2 to check on REFL path going into HAM1, before debiasing, because we plan to use REFL WFS path as reference
- Found REFL beam mis-centered/clipping ALIGO IO STRAGHT HA13 baffle (D1101416) in REFL path, just before going into HAM1.
- Found beam is mis-centered in yaw only on PR2 and behind SRM.
- Conclusion: In opening and closing WEST side of HAM2, cover bumped Bypass mirrors again. 
FECAL MATTER.
- Since we see only a yaw badness, we hoped it was just one mirror that was bumped. 
- Attempted to recover by moving temporary bypass mirror 2 (the one closer to MC3) by just glancing the yaw knob, using alignment on IM4 TRANS QPD as a reference but returning IM4 trans to correct yaw did not regain PRM reflected beam at PR2 or SRM, and moving PRM by gross amounts made no difference. 
- Conclusion: both mirrors got bumped.
VERY VERY SAD.

DECISION / MOTIVATION TO MOVE FORWARD
- Given that we have seen DRMI flashing with well-aligned bypass beam, we know that all core optic suspensions are in the right place (within range of OSEM control).
- PRM only needed moving 10 [urad] in yaw and 500 [urad] in pitch from pre-vent alignment to get DRMI flashing with well-aligned bypass.
- (before opening WEST side of HAM2) We saw PRM REFL beam on REFL WFS DC and on ISCT1 (with well-aligned bypass beam).
- REFL path is determined entirely by IM1 and IM2. We know we have pitched UP IM2 (to bring beam UP on PR2 and IM4 TRANS after IMC realignment of MC1 to get good IMC flashes after MC2 2 [mm] move), but we have NOT moved yaw at all. So *real* IMC path (not bypass) should still be aligned out to REFL path 
- With the now-bumped by-pass path, we see good light still on HAM1 REFL WFS, and on IM4 TRANS QPD. So, we still have a good reference for debiasing IM4, regardless of whether its still aligned to the DRMI.

- Captured WFS REFL DC alignment references with PRM aligned to this morning's flash
- Began following instructions in E1300646
- Trouble with IM4 baffle. 
	- need to remove baffle to get at lock nut that releases pitch adjuster.
	- difficulty removing baffle
	- LHO aLOG 5633 helped determine that we needed to loosen bottom EQ stop brackets on front face to remove baffle
	- Got it off eventually.
- Began debiasing IM4, but immediately found that pitch adjuster and lock nut are fighting each other, and even worse -- pitch debiasing is causing YAW motion, as determined by the OSEMs on IM4.
- Right now, decided to take a break because we've lost the beam on REFL WFS, we're off in yaw after adjusting only pitch. So right now our only metric is the OSEMs. Deep breaths.

In the oscillator laser, the relative humidity is way too high. This means that it is still too high from the leak on 7/1 or the sensor is wet. Somebody should check this out to see if the sensor is working properly.

In the attached graph, the first spike is on the day of the leak. The humidity went down to normal after the lid was taken off and the laser was dried off, but once the lid was replaced, the humidity spiked again.

Perhaps a WatchDog should be added so that when the relative humidity is greater than 60%, somebody is notified.

This morning, with modified razor blades ala Rai, Rich and I tested how we would remove a ~2mm strip of gold/chrome coating from a CP.  We used the old, now spare, CP09 and scratched off some gold at the tip of one of the solder fingers on the barrel of the mass.  The solder finger can be reused if needed further down the finger.

It was somewhat easy to scrape away the top gold coat, but the chrome underneath took some convincing as expected.  We tried a few different methods and tools but in the end, it still looks like scratching removed all of the conductive material.  To test that we were efficient at this, Rich then HIPOT tested at 1kV to make sure there would be no arcing when used in vacuum at the designed high voltage.

There was little particulate seen during this scratching - most particulate seemed to come off with periodic wet wiping.

The glass is scratched but the ~2mm thick scratch site does not appear to be very deep into the substrate (as viewed from the inner surface of the barrel).

The process took ~30 mins of slow start and stop scratching/shaving.

As JessM reported in alog 12743, we were unable to turn on the X dof for the ETMY Stage1 Lvl2 Isolation. We traced this to a ring up at 739 hz. The peak was not evident until the gain for X was about 0.8 and peaked sharply at 0.9 (see dtt plots) and within a few seconds tripped the actuators at a gain of 1.

I added a 10dB notch at 739hz in FM3 and was able to turn on the level 2 completely. I have removed this notch from the filter file.

In this process I notice a peak pop up on the Y dof at 745hz but it doesn't erupt like the X's. When you look at the plant and filter design plots (attached,) it seems a lot of things could pop up if the plant were to change possibly by just a small amount.

I agree with JeffK that these loops should be looked at more closely especially by more experienced control loop types.

• Unlike the green path, it turns out that the viewport is about the only thing that could potentially clip the IR path betwen the ISCTEX periscope and the TMS steering mirror.
• IR beam is more than 2" away from the viewport edge, so we're quite safe.
• We closed the beam diverter, realigned the TMS (because beam diverter tilts the TMS), and adjusted the high power beam dump steering mirror such that the beam goes to the center of the HPBD aperture.

Corey and Filiberto fixed the ground loop problem (separate alog), so we're completely done.

Yesterday's "upgrade" of x1work didn't go so well.  At this point, it is running and appears to be functional for the basic stuff, medm, gds tools, dataviewer, and so on.  There is a possibility that additional packages may need to be restored, please let me know if something doesn't work that used to and I'll work to get it fixed.

SR Crew intending to flash DRMI then handoff to SEI crew around lunch.

LVEA will transition to laser SAFE condition at that time.

Apollo working to install ameristat bib at HAM2, then will pull North door on HAM 6 in order for Gerardo to
install glass and blanks on ports of HAM5/6 septum.

EX - Keita using green light briefly, then de-energizing laser in order to accomodate IR-glasses waiver for Pcal team to work in chamber without green light hazard
EY - RichardM doing some photography work, installing auxiliary power racks (may be at EX as well)

HAM5
Particle Size    Count
[um]                 [ct]
0.3                   0
0.5                   0
0.7                   0
1.0                   0
2.0                   0
5.0                   0

HAM3
Particle Size    Count
[um]                 [ct]
0.3                   0
0.5                   0
0.7                   0
1.0                   0
2.0                   0
5.0                   0

HAM2
Particle Size    Count
[um]                 [ct]
0.3                   0
0.5                   0
0.7                   0
1.0                   0
2.0                   0
5.0                   0

Before starting work just after lunch yesterday, the particle counts were 0 in both HAM 2 and 3!

model restarts logged for Wed 16/Jul/2014
2014_07_16 10:54 h1susetmy
2014_07_16 11:17 h1broadcast0
2014_07_16 11:17 h1dc0
2014_07_16 11:17 h1fw0
2014_07_16 11:17 h1fw1
2014_07_16 11:17 h1nds0
2014_07_16 11:17 h1nds1
2014_07_16 11:20 h1fw0
2014_07_16 11:20 h1fw1
2014_07_16 11:27 h1iopsusey
2014_07_16 11:28 h1iopsusey
2014_07_16 11:30 h1iopsusey
2014_07_16 11:30 h1susetmy
2014_07_16 11:40 h1sustmsy
2014_07_16 11:43 h1broadcast0
2014_07_16 11:43 h1dc0
2014_07_16 11:43 h1fw0
2014_07_16 11:43 h1fw1
2014_07_16 11:43 h1nds0
2014_07_16 11:43 h1nds1

no unexpected restarts. DAQ restarts to support rcg2.9 upgrades at EY.

Two things that were important:

• Better mode matching to the telescope so that the IR beam becomes smaller than the QPDs.
• "Fixed" a crappy binary output cable that goes to the QPDB whitening chassis.

We still need to fix the ground loop problem of TMSX BOSEM, and we still need to look at the IR beam position on the viewport path, but we're basically done with the alignment.

M. Heintze, K. Izumi, T. Sadecki, J. Kissel

After a harrowing few days playing the alignment game, we've accomplished Michelson fringing with the ITM alignments, as measured by a centered beam through the SRM -- and moved the OFI into position such that this fringing is seen through the OFI. The only remaining IFO alignment task is to flash the DRMI with the IMC bypass, and alleviate IM4 bias which is now closer to saturation. Today was a good day. Blow-by-blow below.

Picking up where we left off at lunch (see LHO aLOG 12779), we
- Restored BS alignment to pre-vent value because it's the only optic whose alignment has been preserved from HIFO-XY. (P = +180, Y = -266)
- Re-checked PR3 and PR2 centering, and saw it mis-centered on PR2 (not because anything changed, just we didn't get it perfect before lunch)
- Walked IM2 & IM3 to bring input beam UP in pitch on PR2
- Tweaked IM4 in Yaw -- which is now *very close* to saturation, or will be after pump-down (LL = -93630 [ct] (71% range), UR = +95966 (73% range))
- Once we hit the center of PR2, we needed no further tweaks to PR2 or PR3 or BS -- the beam was centered on ITMX and ITMY and both X-ARM and Y-ARM paths hit SR3 and SR2.
- Blocked ITMY beam, centered X-ARM beam on SR2 and SRM (only small moves needed for SR3 and SR2)
- Unblocked ITMY, steered ITMY a little to get Michelson fringing at and behind SRM. GOOD!
- Saw beam missing OFI by ~300 [urad] of Yaw at SR2 
- While gathering OFI pusher materials, tried to get flashing of SRC with SRM alignment; got close but we were ready to move before we saw flashing. During this exploration, we increased the damping gains on SR3 and SRM to try and reduce motion. They remain high, but no need to keep them that way permanently.
- Moved OFI using pushers -- Front (closest to SRM) ~3/4 [in] (~20 [mm]) in +X, back ~ 3 [mm] in +X (so a slight translation in +X and a twist in -yaw) 
- Moved SRM AR Baffle ~1 [in] (~25 [mm]) in +X direction to center beam through aperture
- Reinstalled SR3 AR Baffle, setting dog-clamps to locations as defined by D1201315.
- As we left the chamber, beam is centered on SRM, at the input to OFI, and into HAM6 septum hole, with fringing visible all the way into HAM6.
WIN.

HAM5 Closeout reading
Particle Size    Count
[um]                 [ct]
0.3                   320
0.5                   120
0.7                   60
1.0                   60
2.0                   40
5.0                   10

HAM4 Closeout reading
Particle Size    Count
[um]                 [ct]
0.3                   50
0.5                   40
0.7                   30
1.0                   20
2.0                   20
5.0                   0

Particle Size    Count
[um]                 [ct]
0.3                  260
0.5                  110
0.7                  90
1.0                  40
2.0                  30
5.0                  10

Pretty Dirty.

1. Ground loop check

Sheila and Arnaud checked the ground loop from outside and one of the TMSX BOSEM cables was bad. Nothing was done to fix it yet.

2. Putting Pico collars and kapton washers

Though I asserted to Corey that EX picos have collars, I was wrong. We put the collars on picomotors where possible, but there was two picomotors (M14 PIT and M3 YAW) where there was not enough space. See pictures.

Then we put kapton washers to all picomotors.

3. Relieving HEPI bias by rebalancing TMS

Some change in the behavior of SUS guardian seems to mean that the SUS bias is not restored by requesting "align". Because I and Sheila were both unaware of this, we tried to "confirm" our alignment with the HEPI bias on with slightly wrong ETMX bias (turned out later that it was about 30urad too much), and we couldn't quite align the TMS, but estimated from the distance of the forward-going and back-going beam on one of the HWP that we needed 30 urad more headroom to align it. (So things were consistent in the end.)

Anyway, we ended up having to relieve about 300 urad of TMS bias in PIT by moving PIT balance masses on the TMS.

4. Setting up ISCTEX for realigning IR QPDs

First we tried to use Sheila's setup as is, but it turned out that the beam would get too large inside the TransMon telescope.

We removed the lens in the IR TRANS monitor path on ISCTEX and that made things better. After much iterations, we reasonably aligned the IR beam such that the beam retro-reflects from the ETMX and the beam position on the secondary is on top of the green beam within 2mm or so. The  IR beam diameter coming out of the arm is about 6mm on the secondary, so 2mm is not very small but should be good enough to put the beam on QPDs.

5. Aligning the steering mirrors on TMS

Not surprisingly, the IR beam was very close to one of the green beams on the QPDs.

We found that the beam was totally off on the QPD sled and was not making it to the QPDs, but just moving M14 was good enough to bring the IR beam on both QPDA and QPDB. It's somewhat puzzling that people could not center the QPDs using M14 and M4, but again it's kind of hard to turn the right knob for the right degree of freedom because two mirrors are almost degenerate (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=11897).

Two disappointments were that the beam was bigger than the 3mm QPD (it looks like 4mm or maybe more), and that the IR power seemed to be too small to be useful for centering. The latter was surprising as the OzOptic laser is nominally 10mW, and given the 95% splitter in the path the power on each QPD should be about 10E-3*0.95*0.05*0.5 = 240uW, which doesn't sound terrible.

Anyway, our mission is to bring the IR beam centered on both QPDs within 1mm, and keep the IR path to the ISCTEX at about the center of the clear aperture formed by the chamber/viewport/table enclosure, to make sure that the pico mirrors can take care of the fine centering job without destroying the in-air IR path. We will center both of the QPDs using M14 (pico) and M15 (manual) as good as can be done by eyeballing tomorrow.