(Apollo [Mark, Tyler], Corey, Daniel, Fil, Keita, Patrick)

This morning IOT2R (small table), IOT2L, & ISCT6 were prepped for being moved.  Prep work included:

• Disconnecting all electrical cables from tables (Photo #1 shows Patch Panels with cables removed.  Thank you, Fil!)
• Marking the position & elevation for IOT2L & ISCT6 (IOT2R is moving from HAM2 to HAM6 & will become SQZT6 (see D1500297))
• Disconnecting bellows from chamber, covering viewports, & covering open holes on tables (See Photo #2--Patrick did most of this for all three tables, Thanks!)
• Removing any loose items on the tables or on top of their enclosures.
• Many thanks to Mark & Tyler for handling bulk of the craning work (Photo#3 shows craning of IOT2R into Squeezer Bay)

Notes For IOT2L:

• Three corners marked with plumb bob +/- 1mm & marked as "Sept 12, 2017"
• Measured elevation of 3 15/16" - 4 " (floor up to --> bottom surface of horizontal boxbeams)
• This was rolled from HAM2, to a space adjacent to the IMC Tube closer to HAM3.  It was fairly easy for two people to roll it as long as the wheels are lined up.

Notes For IOT2R: (smaller table)

• Did not mark position since it is moving to south side of HAM6
• This was rolled from HAM2 to near the Squeezer Bay and then craned into the Squeezer Bay.

Notes For ISCT6:

• Three corners marked with plumb bob +/- 1mm & marked as "Sept 12, 2017"
• Measured elevation of 3.5" (floor up to --> bottom surface of horizontal boxbeams)
• This was craned into the Squeezer Bay.

I measured the beam spot on MC3 yesterday, September 11, 2017, and found that it's +2.11mm in pitch, and -5.82mm in yaw.

Measurements from July 17, 2017, show similar results:  +2.26mm in pitch, and -5.84mm in yaw.

Above measurements are after the Montana 5.8M earthquake, and the measurement below is before.

Measurements from March 17, 2017, show: +2.16mm in pitch, and -5.70mm in yaw.

OSA controller and red MHV to BNC cable -> ISC locker outside of the sqz bay.

OSA itself is on the table.

Thorlabs PD power supply, oscilloscope -> commissioning wire rack

ISCT6 LED power supply -> SQZ bay table

Installed 5 new dust monitors in the LVEA to support chamber openings. The LVEA dust monitors are located and named:

9am local 

Turned on RGA filament at corner station. Will scan later. Beam tube GVs may be closed.

The PSL and ALS shutters have been closed and locked out.

TCSX and TCSY lasers have been disabled.

More follow-up studies, interferometer worked well, reports later. More to do but I think Ill let the last hours of the O2 IFO pass quietly. 

I did a couple more measurements of the ESD actuation tonight.

1)I re-ran the script that allows us to measure 4 coefficicents for each test mass, (described in 38387).  Plots coming soon...

2) I measured Veff by driving the signal electrodes in length while we were locked and adjusting the bias voltage to minimize the coupling to DARM.  This can be checked against the results from the first measurement.  Veff = (beta-beta2)/2(gamma-alpha)

3) For some optics I also measured a different effective bias, by driving the bias path at 12 Hz and changing the offset in the bias path to minimize the coupling to DARM.  Veff 2= (beta+beta2)/2(alpha+gamma)

Here I have written these as positive if the voltage requested out of the DAC is positive, although in reality there is a sign flip in some of the drivers (I will edit this entry in the morning with the correct sign).

J. Kissel

Charge measurements have been completed for today. ETMX remains at a low effective bias voltage, though the expected slow-and-steady charge accumulation has begun. ETMY, after last week's single-cycle TMDS discharge use (see LHO aLOG 38524), show consistent *reduced* effective bias voltage, but not nearly as well mitigated as on ETMX with a three cycle discharge. 

It's still most interesting that while ETMX's discharge has drastically reduced the (non-limiting) unexpected ISI ST2 to DARM coupling (see LHO aLOG 38507), ETMY's discharge appears to have reduced *the* mystery noise (LHO aLOG 38540), via unidentified coupling.

Just for ease of "one number reporting" I again take the mean of all pitch and yaw data points, and compute their standard deviation to form a ball-park uncertainty:
         2017-08-31     2017-09-08     2017-09-11    
ETMY      51+/-34        -21+/-12       -22+/-12 
ETMX      -4+/-3          -4+/-3         -4+/-2

Since we're replacing both ETMs in due time, I think we just don't care what the charge is beyond tomorrow, for the forseeable future.
   (a) We know that we can use the TMDS system to discharge an optic at vacuum in ~2 days
   (b) We know we can use the Bias voltage over a long time period to control / minimize the effective bias voltage
   (c) We now will be using conductive gloves in chamber, as well as plenty of dry-N2 gunning.
So may we just take this off our list of things to care about once Post O2 commissioning ceases until a pre-O3 detector begins to appear.

Thanks to T. Vo, T. Shaffer, and J. Warner for running measurements while I was out, see LHO aLOGs 38593 and 38576 for ETMX and ETMY respectively.

In preparation for IOT2R transport, I removed loose things from IOT2R.

Loose beam dumps were moved to the optics lab.

NPRO controller (S/N 406), an adjustable Faraday isolator from Drever lab, one wave plate (no ID), one 45 deg 99% splitter, one mirror (HR?, no ID), one cube (no ID), and two lenses (one is BICX-25.0-76.6-C, the other is without ID) were all moved to ISC cabinet in the sqz bay.

Two lexan viewport protection plates were moved from inside to the top of the table enclosure.

Everything else is still inside the table. Most notably, NPRO head and the cables.

TITLE: 09/11 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Jim
SHIFT SUMMARY:
LOG:

15:30 Fil, Richard to LVEA for HAM4
15:30 Peter closing PSL shutter
16:15 TCS lasers turned off in software for HWS table move
16:30 HWS table is moved
18:00 Dave to EX replacing workstations, done 20:00
22:15 Kyle to EY

23:00 Peter unshutters PSL, locking starting

Kyle, Gerardo 

We are going to remove IP7 and IP8 this week and send them off to be rebuilt.  We had planned on venting both ion pumps today and removing most of their flange bolts in preparation for removal tomorrow.  After we observed a sizeable leak accross IP7's isolation gate valve (see attached), we decided to leave it evacuated until we are set up to actually remove the pump.  We then can, and in a short period, install a zero-length reducer w/pump port valve in place of the ion pump which will then allow us to pump out to vented volume between the gate and zero-length reduecer and minimize the amount of "wet" air the Diagonal is exposed to.  

Note that the orientation of IP7's isolation gate valve is such that venting the pump side of the valve puts 15psi across the 10" diameter gate trying to force "open" the gate.  

Most of the cabling for the Newtonian Noise array in the LVEA floor have been picked up. It is worth noting that the tape used left parts of the floors sticky. Cleaning crew has been made aware.

The field cables to the HWS (TCSHT4R) enclosure have been disconnected. The TCS Sled Driver Chassis was powered off. See attached for cabling documentation.

F Clara, P. King, R. McCarthy

Earlier it was suspected that the flow rate trip point for the TCSX laser was different from the TCSY laser
because of component value differences for the comparator setpoint voltage.  Both controllers have R115 = 4.87k,
R12 = 10.0k and R11 not stuffed.

    So the trip setpoints are the same and is not the reason for the difference.

Powers and ensuing temps reflect the weekly current increase. The PMC "creep" downward in trans is evident as is it's, inverse,  refl counterpart. I'm not sure what's going on with the chiller data having not spoken to those directly involved. I am confident due to the scheduled manifold work that these chiller conditions are being closely monitored by those directly involved.

Got several hours of PEM follow-up injections last night. This is follow-up on findings in the first round https://dcc.ligo.org/DocDB/0144/G1701613/002/GenevaTalkSm.pdf. Work on identifying the high magnetic coupling in the output arm, the scattering in the input and output arms identified during PEM injections, whether there is significant scattering from the P-cal TX and RX ports and the source the high vibration coupling in the 600 Hz region of the BS. Partial progress, little time.

Hang, TVo

We were locked for about 3 hours before the ITMY Vioilin Mode 5 rang up.  The mode rang up pretty steadily but we were only alerted to it about 30 seconds before it broke lock so we didn't have enough time to change the damping loop.

Upon re-locking, we stopped at ENGAGE_SRC_ASC to look at the status of the violin modes and it seems that the phase has shifted from what is set by the guardian and what is reported in the Violin Mode Wiki.  There were no earthquakes at the time so we couldn't find any obvious environmental reason for this shift.

Here is the summary of the change we made to the ITMY Violin Mode 5 Damping:

Effectively, this shifts the phase by -120 degrees.  I'm not exactly sure if these settings are the nominal ones but it gets the job done.  When the mode was damped sufficiently at nominal low noise, I tried to go back to the "Before" configuration and could see it ringing up so I'm updating the guardian gen state to reflec the "After" configuration.

Patrick, Daniel, Hang, Sheila, TVo

We are back at NLN with a range of about 55 MPC.

Good news, it seems like the ETMY TMDS slightly lowered the noise floor in the 15-55 Hz band!

Attached is a spectra comparing a few different times, the first 3 are just to get a rough reference about what the noise floor was before the discharge measurement but after the Montana EQ.

It seems like ETMX discharge also helped a bit but it wasn't obvious unless you take on the order of hundreds of averages, this still doesn't reconcile all of the mystery noise but there is some progress.